![Ingo Molnar](/assets/img/avatar_default.png)
mutex implementation - add debugging code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@infradead.org>
1474 lines
45 KiB
C
1474 lines
45 KiB
C
#ifndef _LINUX_SCHED_H
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#define _LINUX_SCHED_H
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#include <asm/param.h> /* for HZ */
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#include <linux/config.h>
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#include <linux/capability.h>
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#include <linux/threads.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/timex.h>
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#include <linux/jiffies.h>
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#include <linux/rbtree.h>
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#include <linux/thread_info.h>
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#include <linux/cpumask.h>
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#include <linux/errno.h>
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#include <linux/nodemask.h>
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#include <asm/system.h>
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#include <asm/semaphore.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/mmu.h>
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#include <asm/cputime.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/signal.h>
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#include <linux/securebits.h>
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#include <linux/fs_struct.h>
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#include <linux/compiler.h>
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#include <linux/completion.h>
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#include <linux/pid.h>
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#include <linux/percpu.h>
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#include <linux/topology.h>
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#include <linux/seccomp.h>
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#include <linux/rcupdate.h>
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#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
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struct exec_domain;
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/*
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* cloning flags:
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*/
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#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
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#define CLONE_VM 0x00000100 /* set if VM shared between processes */
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#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
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#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
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#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
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#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
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#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
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#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
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#define CLONE_THREAD 0x00010000 /* Same thread group? */
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#define CLONE_NEWNS 0x00020000 /* New namespace group? */
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#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
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#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
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#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
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#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
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#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
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#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
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#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
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#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
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/*
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* List of flags we want to share for kernel threads,
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* if only because they are not used by them anyway.
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*/
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#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
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/*
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* These are the constant used to fake the fixed-point load-average
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* counting. Some notes:
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* - 11 bit fractions expand to 22 bits by the multiplies: this gives
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* a load-average precision of 10 bits integer + 11 bits fractional
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* - if you want to count load-averages more often, you need more
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* precision, or rounding will get you. With 2-second counting freq,
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* the EXP_n values would be 1981, 2034 and 2043 if still using only
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* 11 bit fractions.
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*/
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extern unsigned long avenrun[]; /* Load averages */
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#define FSHIFT 11 /* nr of bits of precision */
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#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
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#define LOAD_FREQ (5*HZ) /* 5 sec intervals */
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#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
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#define EXP_5 2014 /* 1/exp(5sec/5min) */
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#define EXP_15 2037 /* 1/exp(5sec/15min) */
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#define CALC_LOAD(load,exp,n) \
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load *= exp; \
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load += n*(FIXED_1-exp); \
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load >>= FSHIFT;
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extern unsigned long total_forks;
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extern int nr_threads;
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extern int last_pid;
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DECLARE_PER_CPU(unsigned long, process_counts);
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extern int nr_processes(void);
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extern unsigned long nr_running(void);
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extern unsigned long nr_uninterruptible(void);
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extern unsigned long nr_iowait(void);
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#include <linux/time.h>
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#include <linux/param.h>
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#include <linux/resource.h>
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#include <linux/timer.h>
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#include <asm/processor.h>
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/*
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* Task state bitmask. NOTE! These bits are also
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* encoded in fs/proc/array.c: get_task_state().
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*
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* We have two separate sets of flags: task->state
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* is about runnability, while task->exit_state are
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* about the task exiting. Confusing, but this way
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* modifying one set can't modify the other one by
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* mistake.
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*/
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#define TASK_RUNNING 0
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#define TASK_INTERRUPTIBLE 1
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#define TASK_UNINTERRUPTIBLE 2
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#define TASK_STOPPED 4
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#define TASK_TRACED 8
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/* in tsk->exit_state */
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#define EXIT_ZOMBIE 16
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#define EXIT_DEAD 32
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/* in tsk->state again */
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#define TASK_NONINTERACTIVE 64
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#define __set_task_state(tsk, state_value) \
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do { (tsk)->state = (state_value); } while (0)
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#define set_task_state(tsk, state_value) \
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set_mb((tsk)->state, (state_value))
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/*
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* set_current_state() includes a barrier so that the write of current->state
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* is correctly serialised wrt the caller's subsequent test of whether to
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* actually sleep:
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*
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* set_current_state(TASK_UNINTERRUPTIBLE);
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* if (do_i_need_to_sleep())
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* schedule();
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*
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* If the caller does not need such serialisation then use __set_current_state()
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*/
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#define __set_current_state(state_value) \
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do { current->state = (state_value); } while (0)
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#define set_current_state(state_value) \
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set_mb(current->state, (state_value))
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/* Task command name length */
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#define TASK_COMM_LEN 16
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/*
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* Scheduling policies
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*/
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#define SCHED_NORMAL 0
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#define SCHED_FIFO 1
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#define SCHED_RR 2
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struct sched_param {
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int sched_priority;
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};
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#ifdef __KERNEL__
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#include <linux/spinlock.h>
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/*
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* This serializes "schedule()" and also protects
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* the run-queue from deletions/modifications (but
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* _adding_ to the beginning of the run-queue has
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* a separate lock).
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*/
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extern rwlock_t tasklist_lock;
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extern spinlock_t mmlist_lock;
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typedef struct task_struct task_t;
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extern void sched_init(void);
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extern void sched_init_smp(void);
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extern void init_idle(task_t *idle, int cpu);
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extern cpumask_t nohz_cpu_mask;
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extern void show_state(void);
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extern void show_regs(struct pt_regs *);
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/*
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* TASK is a pointer to the task whose backtrace we want to see (or NULL for current
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* task), SP is the stack pointer of the first frame that should be shown in the back
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* trace (or NULL if the entire call-chain of the task should be shown).
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*/
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extern void show_stack(struct task_struct *task, unsigned long *sp);
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void io_schedule(void);
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long io_schedule_timeout(long timeout);
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extern void cpu_init (void);
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extern void trap_init(void);
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extern void update_process_times(int user);
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extern void scheduler_tick(void);
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#ifdef CONFIG_DETECT_SOFTLOCKUP
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extern void softlockup_tick(struct pt_regs *regs);
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extern void spawn_softlockup_task(void);
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extern void touch_softlockup_watchdog(void);
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#else
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static inline void softlockup_tick(struct pt_regs *regs)
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{
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}
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static inline void spawn_softlockup_task(void)
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{
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}
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static inline void touch_softlockup_watchdog(void)
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{
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}
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#endif
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/* Attach to any functions which should be ignored in wchan output. */
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#define __sched __attribute__((__section__(".sched.text")))
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/* Is this address in the __sched functions? */
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extern int in_sched_functions(unsigned long addr);
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#define MAX_SCHEDULE_TIMEOUT LONG_MAX
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extern signed long FASTCALL(schedule_timeout(signed long timeout));
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extern signed long schedule_timeout_interruptible(signed long timeout);
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extern signed long schedule_timeout_uninterruptible(signed long timeout);
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asmlinkage void schedule(void);
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struct namespace;
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/* Maximum number of active map areas.. This is a random (large) number */
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#define DEFAULT_MAX_MAP_COUNT 65536
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extern int sysctl_max_map_count;
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#include <linux/aio.h>
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extern unsigned long
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arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
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unsigned long, unsigned long);
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extern unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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extern void arch_unmap_area(struct mm_struct *, unsigned long);
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extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
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#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
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/*
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* The mm counters are not protected by its page_table_lock,
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* so must be incremented atomically.
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*/
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#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
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#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
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#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
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#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
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#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
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typedef atomic_long_t mm_counter_t;
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#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
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/*
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* The mm counters are protected by its page_table_lock,
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* so can be incremented directly.
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*/
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#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
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#define get_mm_counter(mm, member) ((mm)->_##member)
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#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
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#define inc_mm_counter(mm, member) (mm)->_##member++
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#define dec_mm_counter(mm, member) (mm)->_##member--
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typedef unsigned long mm_counter_t;
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#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
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#define get_mm_rss(mm) \
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(get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
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#define update_hiwater_rss(mm) do { \
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unsigned long _rss = get_mm_rss(mm); \
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if ((mm)->hiwater_rss < _rss) \
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(mm)->hiwater_rss = _rss; \
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} while (0)
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#define update_hiwater_vm(mm) do { \
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if ((mm)->hiwater_vm < (mm)->total_vm) \
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(mm)->hiwater_vm = (mm)->total_vm; \
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} while (0)
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struct mm_struct {
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struct vm_area_struct * mmap; /* list of VMAs */
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struct rb_root mm_rb;
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struct vm_area_struct * mmap_cache; /* last find_vma result */
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unsigned long (*get_unmapped_area) (struct file *filp,
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unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags);
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void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
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unsigned long mmap_base; /* base of mmap area */
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unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
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unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
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pgd_t * pgd;
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atomic_t mm_users; /* How many users with user space? */
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atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
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int map_count; /* number of VMAs */
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struct rw_semaphore mmap_sem;
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spinlock_t page_table_lock; /* Protects page tables and some counters */
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struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
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* together off init_mm.mmlist, and are protected
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* by mmlist_lock
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*/
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/* Special counters, in some configurations protected by the
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* page_table_lock, in other configurations by being atomic.
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*/
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mm_counter_t _file_rss;
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mm_counter_t _anon_rss;
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unsigned long hiwater_rss; /* High-watermark of RSS usage */
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unsigned long hiwater_vm; /* High-water virtual memory usage */
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unsigned long total_vm, locked_vm, shared_vm, exec_vm;
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unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
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unsigned long start_code, end_code, start_data, end_data;
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unsigned long start_brk, brk, start_stack;
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unsigned long arg_start, arg_end, env_start, env_end;
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unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
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unsigned dumpable:2;
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cpumask_t cpu_vm_mask;
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/* Architecture-specific MM context */
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mm_context_t context;
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/* Token based thrashing protection. */
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unsigned long swap_token_time;
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char recent_pagein;
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/* coredumping support */
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int core_waiters;
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struct completion *core_startup_done, core_done;
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/* aio bits */
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rwlock_t ioctx_list_lock;
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struct kioctx *ioctx_list;
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};
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struct sighand_struct {
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atomic_t count;
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struct k_sigaction action[_NSIG];
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spinlock_t siglock;
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struct rcu_head rcu;
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};
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extern void sighand_free_cb(struct rcu_head *rhp);
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static inline void sighand_free(struct sighand_struct *sp)
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{
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call_rcu(&sp->rcu, sighand_free_cb);
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}
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/*
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* NOTE! "signal_struct" does not have it's own
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* locking, because a shared signal_struct always
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* implies a shared sighand_struct, so locking
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* sighand_struct is always a proper superset of
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* the locking of signal_struct.
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*/
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struct signal_struct {
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atomic_t count;
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atomic_t live;
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wait_queue_head_t wait_chldexit; /* for wait4() */
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/* current thread group signal load-balancing target: */
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task_t *curr_target;
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/* shared signal handling: */
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struct sigpending shared_pending;
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/* thread group exit support */
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int group_exit_code;
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/* overloaded:
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* - notify group_exit_task when ->count is equal to notify_count
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* - everyone except group_exit_task is stopped during signal delivery
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* of fatal signals, group_exit_task processes the signal.
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*/
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struct task_struct *group_exit_task;
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int notify_count;
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/* thread group stop support, overloads group_exit_code too */
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int group_stop_count;
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unsigned int flags; /* see SIGNAL_* flags below */
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/* POSIX.1b Interval Timers */
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struct list_head posix_timers;
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/* ITIMER_REAL timer for the process */
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struct timer_list real_timer;
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unsigned long it_real_value, it_real_incr;
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/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
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cputime_t it_prof_expires, it_virt_expires;
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cputime_t it_prof_incr, it_virt_incr;
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/* job control IDs */
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pid_t pgrp;
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pid_t tty_old_pgrp;
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pid_t session;
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/* boolean value for session group leader */
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int leader;
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struct tty_struct *tty; /* NULL if no tty */
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/*
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* Cumulative resource counters for dead threads in the group,
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* and for reaped dead child processes forked by this group.
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* Live threads maintain their own counters and add to these
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* in __exit_signal, except for the group leader.
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*/
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cputime_t utime, stime, cutime, cstime;
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unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
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unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
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/*
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* Cumulative ns of scheduled CPU time for dead threads in the
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* group, not including a zombie group leader. (This only differs
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* from jiffies_to_ns(utime + stime) if sched_clock uses something
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* other than jiffies.)
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*/
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unsigned long long sched_time;
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/*
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* We don't bother to synchronize most readers of this at all,
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* because there is no reader checking a limit that actually needs
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* to get both rlim_cur and rlim_max atomically, and either one
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* alone is a single word that can safely be read normally.
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* getrlimit/setrlimit use task_lock(current->group_leader) to
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* protect this instead of the siglock, because they really
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* have no need to disable irqs.
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*/
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struct rlimit rlim[RLIM_NLIMITS];
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struct list_head cpu_timers[3];
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/* keep the process-shared keyrings here so that they do the right
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* thing in threads created with CLONE_THREAD */
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#ifdef CONFIG_KEYS
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struct key *session_keyring; /* keyring inherited over fork */
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struct key *process_keyring; /* keyring private to this process */
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#endif
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};
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/* Context switch must be unlocked if interrupts are to be enabled */
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#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
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# define __ARCH_WANT_UNLOCKED_CTXSW
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#endif
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/*
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* Bits in flags field of signal_struct.
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*/
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#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
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#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
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#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
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#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
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/*
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* Priority of a process goes from 0..MAX_PRIO-1, valid RT
|
|
* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
|
|
* in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
|
|
* are inverted: lower p->prio value means higher priority.
|
|
*
|
|
* The MAX_USER_RT_PRIO value allows the actual maximum
|
|
* RT priority to be separate from the value exported to
|
|
* user-space. This allows kernel threads to set their
|
|
* priority to a value higher than any user task. Note:
|
|
* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
|
|
*/
|
|
|
|
#define MAX_USER_RT_PRIO 100
|
|
#define MAX_RT_PRIO MAX_USER_RT_PRIO
|
|
|
|
#define MAX_PRIO (MAX_RT_PRIO + 40)
|
|
|
|
#define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
|
|
|
|
/*
|
|
* Some day this will be a full-fledged user tracking system..
|
|
*/
|
|
struct user_struct {
|
|
atomic_t __count; /* reference count */
|
|
atomic_t processes; /* How many processes does this user have? */
|
|
atomic_t files; /* How many open files does this user have? */
|
|
atomic_t sigpending; /* How many pending signals does this user have? */
|
|
#ifdef CONFIG_INOTIFY
|
|
atomic_t inotify_watches; /* How many inotify watches does this user have? */
|
|
atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
|
|
#endif
|
|
/* protected by mq_lock */
|
|
unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
|
|
unsigned long locked_shm; /* How many pages of mlocked shm ? */
|
|
|
|
#ifdef CONFIG_KEYS
|
|
struct key *uid_keyring; /* UID specific keyring */
|
|
struct key *session_keyring; /* UID's default session keyring */
|
|
#endif
|
|
|
|
/* Hash table maintenance information */
|
|
struct list_head uidhash_list;
|
|
uid_t uid;
|
|
};
|
|
|
|
extern struct user_struct *find_user(uid_t);
|
|
|
|
extern struct user_struct root_user;
|
|
#define INIT_USER (&root_user)
|
|
|
|
typedef struct prio_array prio_array_t;
|
|
struct backing_dev_info;
|
|
struct reclaim_state;
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
struct sched_info {
|
|
/* cumulative counters */
|
|
unsigned long cpu_time, /* time spent on the cpu */
|
|
run_delay, /* time spent waiting on a runqueue */
|
|
pcnt; /* # of timeslices run on this cpu */
|
|
|
|
/* timestamps */
|
|
unsigned long last_arrival, /* when we last ran on a cpu */
|
|
last_queued; /* when we were last queued to run */
|
|
};
|
|
|
|
extern struct file_operations proc_schedstat_operations;
|
|
#endif
|
|
|
|
enum idle_type
|
|
{
|
|
SCHED_IDLE,
|
|
NOT_IDLE,
|
|
NEWLY_IDLE,
|
|
MAX_IDLE_TYPES
|
|
};
|
|
|
|
/*
|
|
* sched-domains (multiprocessor balancing) declarations:
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
|
|
|
|
#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
|
|
#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
|
|
#define SD_BALANCE_EXEC 4 /* Balance on exec */
|
|
#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
|
|
#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
|
|
#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
|
|
#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
|
|
#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
|
|
|
|
struct sched_group {
|
|
struct sched_group *next; /* Must be a circular list */
|
|
cpumask_t cpumask;
|
|
|
|
/*
|
|
* CPU power of this group, SCHED_LOAD_SCALE being max power for a
|
|
* single CPU. This is read only (except for setup, hotplug CPU).
|
|
*/
|
|
unsigned long cpu_power;
|
|
};
|
|
|
|
struct sched_domain {
|
|
/* These fields must be setup */
|
|
struct sched_domain *parent; /* top domain must be null terminated */
|
|
struct sched_group *groups; /* the balancing groups of the domain */
|
|
cpumask_t span; /* span of all CPUs in this domain */
|
|
unsigned long min_interval; /* Minimum balance interval ms */
|
|
unsigned long max_interval; /* Maximum balance interval ms */
|
|
unsigned int busy_factor; /* less balancing by factor if busy */
|
|
unsigned int imbalance_pct; /* No balance until over watermark */
|
|
unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
|
|
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
|
|
unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
|
|
unsigned int busy_idx;
|
|
unsigned int idle_idx;
|
|
unsigned int newidle_idx;
|
|
unsigned int wake_idx;
|
|
unsigned int forkexec_idx;
|
|
int flags; /* See SD_* */
|
|
|
|
/* Runtime fields. */
|
|
unsigned long last_balance; /* init to jiffies. units in jiffies */
|
|
unsigned int balance_interval; /* initialise to 1. units in ms. */
|
|
unsigned int nr_balance_failed; /* initialise to 0 */
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
/* load_balance() stats */
|
|
unsigned long lb_cnt[MAX_IDLE_TYPES];
|
|
unsigned long lb_failed[MAX_IDLE_TYPES];
|
|
unsigned long lb_balanced[MAX_IDLE_TYPES];
|
|
unsigned long lb_imbalance[MAX_IDLE_TYPES];
|
|
unsigned long lb_gained[MAX_IDLE_TYPES];
|
|
unsigned long lb_hot_gained[MAX_IDLE_TYPES];
|
|
unsigned long lb_nobusyg[MAX_IDLE_TYPES];
|
|
unsigned long lb_nobusyq[MAX_IDLE_TYPES];
|
|
|
|
/* Active load balancing */
|
|
unsigned long alb_cnt;
|
|
unsigned long alb_failed;
|
|
unsigned long alb_pushed;
|
|
|
|
/* SD_BALANCE_EXEC stats */
|
|
unsigned long sbe_cnt;
|
|
unsigned long sbe_balanced;
|
|
unsigned long sbe_pushed;
|
|
|
|
/* SD_BALANCE_FORK stats */
|
|
unsigned long sbf_cnt;
|
|
unsigned long sbf_balanced;
|
|
unsigned long sbf_pushed;
|
|
|
|
/* try_to_wake_up() stats */
|
|
unsigned long ttwu_wake_remote;
|
|
unsigned long ttwu_move_affine;
|
|
unsigned long ttwu_move_balance;
|
|
#endif
|
|
};
|
|
|
|
extern void partition_sched_domains(cpumask_t *partition1,
|
|
cpumask_t *partition2);
|
|
#endif /* CONFIG_SMP */
|
|
|
|
|
|
struct io_context; /* See blkdev.h */
|
|
void exit_io_context(void);
|
|
struct cpuset;
|
|
|
|
#define NGROUPS_SMALL 32
|
|
#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
|
|
struct group_info {
|
|
int ngroups;
|
|
atomic_t usage;
|
|
gid_t small_block[NGROUPS_SMALL];
|
|
int nblocks;
|
|
gid_t *blocks[0];
|
|
};
|
|
|
|
/*
|
|
* get_group_info() must be called with the owning task locked (via task_lock())
|
|
* when task != current. The reason being that the vast majority of callers are
|
|
* looking at current->group_info, which can not be changed except by the
|
|
* current task. Changing current->group_info requires the task lock, too.
|
|
*/
|
|
#define get_group_info(group_info) do { \
|
|
atomic_inc(&(group_info)->usage); \
|
|
} while (0)
|
|
|
|
#define put_group_info(group_info) do { \
|
|
if (atomic_dec_and_test(&(group_info)->usage)) \
|
|
groups_free(group_info); \
|
|
} while (0)
|
|
|
|
extern struct group_info *groups_alloc(int gidsetsize);
|
|
extern void groups_free(struct group_info *group_info);
|
|
extern int set_current_groups(struct group_info *group_info);
|
|
extern int groups_search(struct group_info *group_info, gid_t grp);
|
|
/* access the groups "array" with this macro */
|
|
#define GROUP_AT(gi, i) \
|
|
((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
|
|
|
|
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
|
|
extern void prefetch_stack(struct task_struct*);
|
|
#else
|
|
static inline void prefetch_stack(struct task_struct *t) { }
|
|
#endif
|
|
|
|
struct audit_context; /* See audit.c */
|
|
struct mempolicy;
|
|
|
|
struct task_struct {
|
|
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
|
|
struct thread_info *thread_info;
|
|
atomic_t usage;
|
|
unsigned long flags; /* per process flags, defined below */
|
|
unsigned long ptrace;
|
|
|
|
int lock_depth; /* BKL lock depth */
|
|
|
|
#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
|
|
int oncpu;
|
|
#endif
|
|
int prio, static_prio;
|
|
struct list_head run_list;
|
|
prio_array_t *array;
|
|
|
|
unsigned short ioprio;
|
|
|
|
unsigned long sleep_avg;
|
|
unsigned long long timestamp, last_ran;
|
|
unsigned long long sched_time; /* sched_clock time spent running */
|
|
int activated;
|
|
|
|
unsigned long policy;
|
|
cpumask_t cpus_allowed;
|
|
unsigned int time_slice, first_time_slice;
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
struct sched_info sched_info;
|
|
#endif
|
|
|
|
struct list_head tasks;
|
|
/*
|
|
* ptrace_list/ptrace_children forms the list of my children
|
|
* that were stolen by a ptracer.
|
|
*/
|
|
struct list_head ptrace_children;
|
|
struct list_head ptrace_list;
|
|
|
|
struct mm_struct *mm, *active_mm;
|
|
|
|
/* task state */
|
|
struct linux_binfmt *binfmt;
|
|
long exit_state;
|
|
int exit_code, exit_signal;
|
|
int pdeath_signal; /* The signal sent when the parent dies */
|
|
/* ??? */
|
|
unsigned long personality;
|
|
unsigned did_exec:1;
|
|
pid_t pid;
|
|
pid_t tgid;
|
|
/*
|
|
* pointers to (original) parent process, youngest child, younger sibling,
|
|
* older sibling, respectively. (p->father can be replaced with
|
|
* p->parent->pid)
|
|
*/
|
|
struct task_struct *real_parent; /* real parent process (when being debugged) */
|
|
struct task_struct *parent; /* parent process */
|
|
/*
|
|
* children/sibling forms the list of my children plus the
|
|
* tasks I'm ptracing.
|
|
*/
|
|
struct list_head children; /* list of my children */
|
|
struct list_head sibling; /* linkage in my parent's children list */
|
|
struct task_struct *group_leader; /* threadgroup leader */
|
|
|
|
/* PID/PID hash table linkage. */
|
|
struct pid pids[PIDTYPE_MAX];
|
|
|
|
struct completion *vfork_done; /* for vfork() */
|
|
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
|
|
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
|
|
|
|
unsigned long rt_priority;
|
|
cputime_t utime, stime;
|
|
unsigned long nvcsw, nivcsw; /* context switch counts */
|
|
struct timespec start_time;
|
|
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
|
|
unsigned long min_flt, maj_flt;
|
|
|
|
cputime_t it_prof_expires, it_virt_expires;
|
|
unsigned long long it_sched_expires;
|
|
struct list_head cpu_timers[3];
|
|
|
|
/* process credentials */
|
|
uid_t uid,euid,suid,fsuid;
|
|
gid_t gid,egid,sgid,fsgid;
|
|
struct group_info *group_info;
|
|
kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
|
|
unsigned keep_capabilities:1;
|
|
struct user_struct *user;
|
|
#ifdef CONFIG_KEYS
|
|
struct key *request_key_auth; /* assumed request_key authority */
|
|
struct key *thread_keyring; /* keyring private to this thread */
|
|
unsigned char jit_keyring; /* default keyring to attach requested keys to */
|
|
#endif
|
|
int oomkilladj; /* OOM kill score adjustment (bit shift). */
|
|
char comm[TASK_COMM_LEN]; /* executable name excluding path
|
|
- access with [gs]et_task_comm (which lock
|
|
it with task_lock())
|
|
- initialized normally by flush_old_exec */
|
|
/* file system info */
|
|
int link_count, total_link_count;
|
|
/* ipc stuff */
|
|
struct sysv_sem sysvsem;
|
|
/* CPU-specific state of this task */
|
|
struct thread_struct thread;
|
|
/* filesystem information */
|
|
struct fs_struct *fs;
|
|
/* open file information */
|
|
struct files_struct *files;
|
|
/* namespace */
|
|
struct namespace *namespace;
|
|
/* signal handlers */
|
|
struct signal_struct *signal;
|
|
struct sighand_struct *sighand;
|
|
|
|
sigset_t blocked, real_blocked;
|
|
struct sigpending pending;
|
|
|
|
unsigned long sas_ss_sp;
|
|
size_t sas_ss_size;
|
|
int (*notifier)(void *priv);
|
|
void *notifier_data;
|
|
sigset_t *notifier_mask;
|
|
|
|
void *security;
|
|
struct audit_context *audit_context;
|
|
seccomp_t seccomp;
|
|
|
|
/* Thread group tracking */
|
|
u32 parent_exec_id;
|
|
u32 self_exec_id;
|
|
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
|
|
spinlock_t alloc_lock;
|
|
/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
|
|
spinlock_t proc_lock;
|
|
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
/* mutex deadlock detection */
|
|
struct mutex_waiter *blocked_on;
|
|
#endif
|
|
|
|
/* journalling filesystem info */
|
|
void *journal_info;
|
|
|
|
/* VM state */
|
|
struct reclaim_state *reclaim_state;
|
|
|
|
struct dentry *proc_dentry;
|
|
struct backing_dev_info *backing_dev_info;
|
|
|
|
struct io_context *io_context;
|
|
|
|
unsigned long ptrace_message;
|
|
siginfo_t *last_siginfo; /* For ptrace use. */
|
|
/*
|
|
* current io wait handle: wait queue entry to use for io waits
|
|
* If this thread is processing aio, this points at the waitqueue
|
|
* inside the currently handled kiocb. It may be NULL (i.e. default
|
|
* to a stack based synchronous wait) if its doing sync IO.
|
|
*/
|
|
wait_queue_t *io_wait;
|
|
/* i/o counters(bytes read/written, #syscalls */
|
|
u64 rchar, wchar, syscr, syscw;
|
|
#if defined(CONFIG_BSD_PROCESS_ACCT)
|
|
u64 acct_rss_mem1; /* accumulated rss usage */
|
|
u64 acct_vm_mem1; /* accumulated virtual memory usage */
|
|
clock_t acct_stimexpd; /* clock_t-converted stime since last update */
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
struct mempolicy *mempolicy;
|
|
short il_next;
|
|
#endif
|
|
#ifdef CONFIG_CPUSETS
|
|
struct cpuset *cpuset;
|
|
nodemask_t mems_allowed;
|
|
int cpuset_mems_generation;
|
|
#endif
|
|
atomic_t fs_excl; /* holding fs exclusive resources */
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static inline pid_t process_group(struct task_struct *tsk)
|
|
{
|
|
return tsk->signal->pgrp;
|
|
}
|
|
|
|
/**
|
|
* pid_alive - check that a task structure is not stale
|
|
* @p: Task structure to be checked.
|
|
*
|
|
* Test if a process is not yet dead (at most zombie state)
|
|
* If pid_alive fails, then pointers within the task structure
|
|
* can be stale and must not be dereferenced.
|
|
*/
|
|
static inline int pid_alive(struct task_struct *p)
|
|
{
|
|
return p->pids[PIDTYPE_PID].nr != 0;
|
|
}
|
|
|
|
extern void free_task(struct task_struct *tsk);
|
|
extern void __put_task_struct(struct task_struct *tsk);
|
|
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
|
|
|
|
extern void __put_task_struct_cb(struct rcu_head *rhp);
|
|
|
|
static inline void put_task_struct(struct task_struct *t)
|
|
{
|
|
if (atomic_dec_and_test(&t->usage))
|
|
call_rcu(&t->rcu, __put_task_struct_cb);
|
|
}
|
|
|
|
/*
|
|
* Per process flags
|
|
*/
|
|
#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
|
|
/* Not implemented yet, only for 486*/
|
|
#define PF_STARTING 0x00000002 /* being created */
|
|
#define PF_EXITING 0x00000004 /* getting shut down */
|
|
#define PF_DEAD 0x00000008 /* Dead */
|
|
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
|
|
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
|
|
#define PF_DUMPCORE 0x00000200 /* dumped core */
|
|
#define PF_SIGNALED 0x00000400 /* killed by a signal */
|
|
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
|
|
#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
|
|
#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
|
|
#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
|
|
#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
|
|
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
|
|
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
|
|
#define PF_KSWAPD 0x00040000 /* I am kswapd */
|
|
#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
|
|
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
|
|
#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
|
|
#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
|
|
#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
|
|
#define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
|
|
|
|
/*
|
|
* Only the _current_ task can read/write to tsk->flags, but other
|
|
* tasks can access tsk->flags in readonly mode for example
|
|
* with tsk_used_math (like during threaded core dumping).
|
|
* There is however an exception to this rule during ptrace
|
|
* or during fork: the ptracer task is allowed to write to the
|
|
* child->flags of its traced child (same goes for fork, the parent
|
|
* can write to the child->flags), because we're guaranteed the
|
|
* child is not running and in turn not changing child->flags
|
|
* at the same time the parent does it.
|
|
*/
|
|
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
|
|
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
|
|
#define clear_used_math() clear_stopped_child_used_math(current)
|
|
#define set_used_math() set_stopped_child_used_math(current)
|
|
#define conditional_stopped_child_used_math(condition, child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
|
|
#define conditional_used_math(condition) \
|
|
conditional_stopped_child_used_math(condition, current)
|
|
#define copy_to_stopped_child_used_math(child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
|
|
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
|
|
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
|
|
#define used_math() tsk_used_math(current)
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
|
|
#else
|
|
static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
|
|
{
|
|
if (!cpu_isset(0, new_mask))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
extern unsigned long long sched_clock(void);
|
|
extern unsigned long long current_sched_time(const task_t *current_task);
|
|
|
|
/* sched_exec is called by processes performing an exec */
|
|
#ifdef CONFIG_SMP
|
|
extern void sched_exec(void);
|
|
#else
|
|
#define sched_exec() {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void idle_task_exit(void);
|
|
#else
|
|
static inline void idle_task_exit(void) {}
|
|
#endif
|
|
|
|
extern void sched_idle_next(void);
|
|
extern void set_user_nice(task_t *p, long nice);
|
|
extern int task_prio(const task_t *p);
|
|
extern int task_nice(const task_t *p);
|
|
extern int can_nice(const task_t *p, const int nice);
|
|
extern int task_curr(const task_t *p);
|
|
extern int idle_cpu(int cpu);
|
|
extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
|
|
extern task_t *idle_task(int cpu);
|
|
extern task_t *curr_task(int cpu);
|
|
extern void set_curr_task(int cpu, task_t *p);
|
|
|
|
void yield(void);
|
|
|
|
/*
|
|
* The default (Linux) execution domain.
|
|
*/
|
|
extern struct exec_domain default_exec_domain;
|
|
|
|
union thread_union {
|
|
struct thread_info thread_info;
|
|
unsigned long stack[THREAD_SIZE/sizeof(long)];
|
|
};
|
|
|
|
#ifndef __HAVE_ARCH_KSTACK_END
|
|
static inline int kstack_end(void *addr)
|
|
{
|
|
/* Reliable end of stack detection:
|
|
* Some APM bios versions misalign the stack
|
|
*/
|
|
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
|
|
}
|
|
#endif
|
|
|
|
extern union thread_union init_thread_union;
|
|
extern struct task_struct init_task;
|
|
|
|
extern struct mm_struct init_mm;
|
|
|
|
#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
|
|
extern struct task_struct *find_task_by_pid_type(int type, int pid);
|
|
extern void set_special_pids(pid_t session, pid_t pgrp);
|
|
extern void __set_special_pids(pid_t session, pid_t pgrp);
|
|
|
|
/* per-UID process charging. */
|
|
extern struct user_struct * alloc_uid(uid_t);
|
|
static inline struct user_struct *get_uid(struct user_struct *u)
|
|
{
|
|
atomic_inc(&u->__count);
|
|
return u;
|
|
}
|
|
extern void free_uid(struct user_struct *);
|
|
extern void switch_uid(struct user_struct *);
|
|
|
|
#include <asm/current.h>
|
|
|
|
extern void do_timer(struct pt_regs *);
|
|
|
|
extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
|
|
extern int FASTCALL(wake_up_process(struct task_struct * tsk));
|
|
extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
|
|
unsigned long clone_flags));
|
|
#ifdef CONFIG_SMP
|
|
extern void kick_process(struct task_struct *tsk);
|
|
#else
|
|
static inline void kick_process(struct task_struct *tsk) { }
|
|
#endif
|
|
extern void FASTCALL(sched_fork(task_t * p, int clone_flags));
|
|
extern void FASTCALL(sched_exit(task_t * p));
|
|
|
|
extern int in_group_p(gid_t);
|
|
extern int in_egroup_p(gid_t);
|
|
|
|
extern void proc_caches_init(void);
|
|
extern void flush_signals(struct task_struct *);
|
|
extern void flush_signal_handlers(struct task_struct *, int force_default);
|
|
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
|
|
|
|
static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&tsk->sighand->siglock, flags);
|
|
ret = dequeue_signal(tsk, mask, info);
|
|
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
extern void block_all_signals(int (*notifier)(void *priv), void *priv,
|
|
sigset_t *mask);
|
|
extern void unblock_all_signals(void);
|
|
extern void release_task(struct task_struct * p);
|
|
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int force_sigsegv(int, struct task_struct *);
|
|
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
|
|
extern int kill_pg_info(int, struct siginfo *, pid_t);
|
|
extern int kill_proc_info(int, struct siginfo *, pid_t);
|
|
extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t);
|
|
extern void do_notify_parent(struct task_struct *, int);
|
|
extern void force_sig(int, struct task_struct *);
|
|
extern void force_sig_specific(int, struct task_struct *);
|
|
extern int send_sig(int, struct task_struct *, int);
|
|
extern void zap_other_threads(struct task_struct *p);
|
|
extern int kill_pg(pid_t, int, int);
|
|
extern int kill_sl(pid_t, int, int);
|
|
extern int kill_proc(pid_t, int, int);
|
|
extern struct sigqueue *sigqueue_alloc(void);
|
|
extern void sigqueue_free(struct sigqueue *);
|
|
extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
|
|
extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
|
|
extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
|
|
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
|
|
|
|
/* These can be the second arg to send_sig_info/send_group_sig_info. */
|
|
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
|
|
#define SEND_SIG_PRIV ((struct siginfo *) 1)
|
|
#define SEND_SIG_FORCED ((struct siginfo *) 2)
|
|
|
|
static inline int is_si_special(const struct siginfo *info)
|
|
{
|
|
return info <= SEND_SIG_FORCED;
|
|
}
|
|
|
|
/* True if we are on the alternate signal stack. */
|
|
|
|
static inline int on_sig_stack(unsigned long sp)
|
|
{
|
|
return (sp - current->sas_ss_sp < current->sas_ss_size);
|
|
}
|
|
|
|
static inline int sas_ss_flags(unsigned long sp)
|
|
{
|
|
return (current->sas_ss_size == 0 ? SS_DISABLE
|
|
: on_sig_stack(sp) ? SS_ONSTACK : 0);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
/* code is in security.c */
|
|
extern int capable(int cap);
|
|
#else
|
|
static inline int capable(int cap)
|
|
{
|
|
if (cap_raised(current->cap_effective, cap)) {
|
|
current->flags |= PF_SUPERPRIV;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Routines for handling mm_structs
|
|
*/
|
|
extern struct mm_struct * mm_alloc(void);
|
|
|
|
/* mmdrop drops the mm and the page tables */
|
|
extern void FASTCALL(__mmdrop(struct mm_struct *));
|
|
static inline void mmdrop(struct mm_struct * mm)
|
|
{
|
|
if (atomic_dec_and_test(&mm->mm_count))
|
|
__mmdrop(mm);
|
|
}
|
|
|
|
/* mmput gets rid of the mappings and all user-space */
|
|
extern void mmput(struct mm_struct *);
|
|
/* Grab a reference to a task's mm, if it is not already going away */
|
|
extern struct mm_struct *get_task_mm(struct task_struct *task);
|
|
/* Remove the current tasks stale references to the old mm_struct */
|
|
extern void mm_release(struct task_struct *, struct mm_struct *);
|
|
|
|
extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
|
|
extern void flush_thread(void);
|
|
extern void exit_thread(void);
|
|
|
|
extern void exit_files(struct task_struct *);
|
|
extern void exit_signal(struct task_struct *);
|
|
extern void __exit_signal(struct task_struct *);
|
|
extern void exit_sighand(struct task_struct *);
|
|
extern void __exit_sighand(struct task_struct *);
|
|
extern void exit_itimers(struct signal_struct *);
|
|
|
|
extern NORET_TYPE void do_group_exit(int);
|
|
|
|
extern void daemonize(const char *, ...);
|
|
extern int allow_signal(int);
|
|
extern int disallow_signal(int);
|
|
extern task_t *child_reaper;
|
|
|
|
extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
|
|
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
|
|
task_t *fork_idle(int);
|
|
|
|
extern void set_task_comm(struct task_struct *tsk, char *from);
|
|
extern void get_task_comm(char *to, struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void wait_task_inactive(task_t * p);
|
|
#else
|
|
#define wait_task_inactive(p) do { } while (0)
|
|
#endif
|
|
|
|
#define remove_parent(p) list_del_init(&(p)->sibling)
|
|
#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
|
|
|
|
#define REMOVE_LINKS(p) do { \
|
|
if (thread_group_leader(p)) \
|
|
list_del_init(&(p)->tasks); \
|
|
remove_parent(p); \
|
|
} while (0)
|
|
|
|
#define SET_LINKS(p) do { \
|
|
if (thread_group_leader(p)) \
|
|
list_add_tail(&(p)->tasks,&init_task.tasks); \
|
|
add_parent(p, (p)->parent); \
|
|
} while (0)
|
|
|
|
#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
|
|
#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
|
|
|
|
#define for_each_process(p) \
|
|
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
|
|
|
|
/*
|
|
* Careful: do_each_thread/while_each_thread is a double loop so
|
|
* 'break' will not work as expected - use goto instead.
|
|
*/
|
|
#define do_each_thread(g, t) \
|
|
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
|
|
|
|
#define while_each_thread(g, t) \
|
|
while ((t = next_thread(t)) != g)
|
|
|
|
extern task_t * FASTCALL(next_thread(const task_t *p));
|
|
|
|
#define thread_group_leader(p) (p->pid == p->tgid)
|
|
|
|
static inline int thread_group_empty(task_t *p)
|
|
{
|
|
return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
|
|
}
|
|
|
|
#define delay_group_leader(p) \
|
|
(thread_group_leader(p) && !thread_group_empty(p))
|
|
|
|
extern void unhash_process(struct task_struct *p);
|
|
|
|
/*
|
|
* Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
|
|
* subscriptions and synchronises with wait4(). Also used in procfs. Also
|
|
* pins the final release of task.io_context. Also protects ->cpuset.
|
|
*
|
|
* Nests both inside and outside of read_lock(&tasklist_lock).
|
|
* It must not be nested with write_lock_irq(&tasklist_lock),
|
|
* neither inside nor outside.
|
|
*/
|
|
static inline void task_lock(struct task_struct *p)
|
|
{
|
|
spin_lock(&p->alloc_lock);
|
|
}
|
|
|
|
static inline void task_unlock(struct task_struct *p)
|
|
{
|
|
spin_unlock(&p->alloc_lock);
|
|
}
|
|
|
|
#ifndef __HAVE_THREAD_FUNCTIONS
|
|
|
|
#define task_thread_info(task) (task)->thread_info
|
|
|
|
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
|
|
{
|
|
*task_thread_info(p) = *task_thread_info(org);
|
|
task_thread_info(p)->task = p;
|
|
}
|
|
|
|
static inline unsigned long *end_of_stack(struct task_struct *p)
|
|
{
|
|
return (unsigned long *)(p->thread_info + 1);
|
|
}
|
|
|
|
#endif
|
|
|
|
/* set thread flags in other task's structures
|
|
* - see asm/thread_info.h for TIF_xxxx flags available
|
|
*/
|
|
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void set_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline void clear_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline int signal_pending(struct task_struct *p)
|
|
{
|
|
return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
|
|
}
|
|
|
|
static inline int need_resched(void)
|
|
{
|
|
return unlikely(test_thread_flag(TIF_NEED_RESCHED));
|
|
}
|
|
|
|
/*
|
|
* cond_resched() and cond_resched_lock(): latency reduction via
|
|
* explicit rescheduling in places that are safe. The return
|
|
* value indicates whether a reschedule was done in fact.
|
|
* cond_resched_lock() will drop the spinlock before scheduling,
|
|
* cond_resched_softirq() will enable bhs before scheduling.
|
|
*/
|
|
extern int cond_resched(void);
|
|
extern int cond_resched_lock(spinlock_t * lock);
|
|
extern int cond_resched_softirq(void);
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting?:
|
|
*/
|
|
#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
|
|
# define need_lockbreak(lock) ((lock)->break_lock)
|
|
#else
|
|
# define need_lockbreak(lock) 0
|
|
#endif
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting or preemption being signalled:
|
|
*/
|
|
static inline int lock_need_resched(spinlock_t *lock)
|
|
{
|
|
if (need_lockbreak(lock) || need_resched())
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Reevaluate whether the task has signals pending delivery.
|
|
This is required every time the blocked sigset_t changes.
|
|
callers must hold sighand->siglock. */
|
|
|
|
extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
|
|
extern void recalc_sigpending(void);
|
|
|
|
extern void signal_wake_up(struct task_struct *t, int resume_stopped);
|
|
|
|
/*
|
|
* Wrappers for p->thread_info->cpu access. No-op on UP.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return task_thread_info(p)->cpu;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
task_thread_info(p)->cpu = cpu;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
|
|
extern void arch_pick_mmap_layout(struct mm_struct *mm);
|
|
#else
|
|
static inline void arch_pick_mmap_layout(struct mm_struct *mm)
|
|
{
|
|
mm->mmap_base = TASK_UNMAPPED_BASE;
|
|
mm->get_unmapped_area = arch_get_unmapped_area;
|
|
mm->unmap_area = arch_unmap_area;
|
|
}
|
|
#endif
|
|
|
|
extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
|
|
extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
|
|
extern void normalize_rt_tasks(void);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* Check if a process has been frozen
|
|
*/
|
|
static inline int frozen(struct task_struct *p)
|
|
{
|
|
return p->flags & PF_FROZEN;
|
|
}
|
|
|
|
/*
|
|
* Check if there is a request to freeze a process
|
|
*/
|
|
static inline int freezing(struct task_struct *p)
|
|
{
|
|
return p->flags & PF_FREEZE;
|
|
}
|
|
|
|
/*
|
|
* Request that a process be frozen
|
|
* FIXME: SMP problem. We may not modify other process' flags!
|
|
*/
|
|
static inline void freeze(struct task_struct *p)
|
|
{
|
|
p->flags |= PF_FREEZE;
|
|
}
|
|
|
|
/*
|
|
* Wake up a frozen process
|
|
*/
|
|
static inline int thaw_process(struct task_struct *p)
|
|
{
|
|
if (frozen(p)) {
|
|
p->flags &= ~PF_FROZEN;
|
|
wake_up_process(p);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* freezing is complete, mark process as frozen
|
|
*/
|
|
static inline void frozen_process(struct task_struct *p)
|
|
{
|
|
p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN;
|
|
}
|
|
|
|
extern void refrigerator(void);
|
|
extern int freeze_processes(void);
|
|
extern void thaw_processes(void);
|
|
|
|
static inline int try_to_freeze(void)
|
|
{
|
|
if (freezing(current)) {
|
|
refrigerator();
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int frozen(struct task_struct *p) { return 0; }
|
|
static inline int freezing(struct task_struct *p) { return 0; }
|
|
static inline void freeze(struct task_struct *p) { BUG(); }
|
|
static inline int thaw_process(struct task_struct *p) { return 1; }
|
|
static inline void frozen_process(struct task_struct *p) { BUG(); }
|
|
|
|
static inline void refrigerator(void) {}
|
|
static inline int freeze_processes(void) { BUG(); return 0; }
|
|
static inline void thaw_processes(void) {}
|
|
|
|
static inline int try_to_freeze(void) { return 0; }
|
|
|
|
#endif /* CONFIG_PM */
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|