102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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Glaurung, a UCI chess playing engine.
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Copyright (C) 2004-2008 Tord Romstad
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Glaurung is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Glaurung is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(LOCK_H_INCLUDED)
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#define LOCK_H_INCLUDED
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// x86 assembly language locks or OS spin locks may perform faster than
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// mutex locks on some platforms. On my machine, mutexes seem to be the
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// best.
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//#define ASM_LOCK
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//#define OS_SPIN_LOCK
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#if defined(ASM_LOCK)
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typedef volatile int Lock;
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static inline void LockX86(Lock *lock) {
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int dummy;
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asm __volatile__("1: movl $1, %0" "\n\t"
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" xchgl (%1), %0" "\n\t" " testl %0, %0" "\n\t"
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" jz 3f" "\n\t" "2: pause" "\n\t"
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" movl (%1), %0" "\n\t" " testl %0, %0" "\n\t"
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" jnz 2b" "\n\t" " jmp 1b" "\n\t" "3:"
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"\n\t":"=&q"(dummy)
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:"q"(lock)
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:"cc");
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}
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static inline void UnlockX86(Lock *lock) {
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int dummy;
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asm __volatile__("movl $0, (%1)":"=&q"(dummy)
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:"q"(lock));
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}
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# define lock_init(x, y) (*(x) = 0)
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# define lock_grab(x) LockX86(x)
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# define lock_release(x) UnlockX86(x)
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# define lock_destroy(x)
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#elif defined(OS_SPIN_LOCK)
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# include <libkern/OSAtomic.h>
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typedef OSSpinLock Lock;
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# define lock_init(x, y) (*(x) = 0)
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# define lock_grab(x) OSSpinLockLock(x)
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# define lock_release(x) OSSpinLockUnlock(x)
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# define lock_destroy(x)
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#elif !defined(_MSC_VER)
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# include <pthread.h>
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typedef pthread_mutex_t Lock;
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# define lock_init(x, y) pthread_mutex_init(x, y)
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# define lock_grab(x) pthread_mutex_lock(x)
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# define lock_release(x) pthread_mutex_unlock(x)
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# define lock_destroy(x) pthread_mutex_destroy(x)
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#else
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# include <windows.h>
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typedef CRITICAL_SECTION Lock;
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# define lock_init(x, y) InitializeCriticalSection(x)
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# define lock_grab(x) EnterCriticalSection(x)
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# define lock_release(x) LeaveCriticalSection(x)
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# define lock_destroy(x) DeleteCriticalSection(x)
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#endif
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#endif // !defined(LOCK_H_INCLUDED)
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