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unix/mpthreadport: Use named semaphores on Mac OS X. 

Unnamed semaphores (via sem_init) are not supported on this OS.  See #4465.
pull/1/head
Damiano Mazzella 2019-02-05 22:13:36 +01:00 committed by Damien George
parent 968b688055
commit 0b86ba565c
1 changed files with 24 additions and 0 deletions
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24
ports/unix/mpthreadport.c
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@ -34,6 +34,7 @@
#if MICROPY_PY_THREAD
#include <fcntl.h>
#include <signal.h>
#include <sched.h>
#include <semaphore.h>
@ -54,7 +55,12 @@ STATIC thread_t *thread;
// this is used to synchronise the signal handler of the thread
// it's needed because we can't use any pthread calls in a signal handler
#if defined(__APPLE__)
STATIC char thread_signal_done_name[25];
STATIC sem_t *thread_signal_done_p;
#else
STATIC sem_t thread_signal_done;
#endif
// this signal handler is used to scan the regs and stack of a thread
STATIC void mp_thread_gc(int signo, siginfo_t *info, void *context) {
@ -71,7 +77,11 @@ STATIC void mp_thread_gc(int signo, siginfo_t *info, void *context) {
void **ptrs = (void**)(void*)MP_STATE_THREAD(pystack_start);
gc_collect_root(ptrs, (MP_STATE_THREAD(pystack_cur) - MP_STATE_THREAD(pystack_start)) / sizeof(void*));
#endif
#if defined (__APPLE__)
sem_post(thread_signal_done_p);
#else
sem_post(&thread_signal_done);
#endif
}
}
@ -85,7 +95,13 @@ void mp_thread_init(void) {
thread->ready = 1;
thread->arg = NULL;
thread->next = NULL;
#if defined(__APPLE__)
snprintf(thread_signal_done_name, sizeof(thread_signal_done_name), "micropython_sem_%d", (int)thread->id);
thread_signal_done_p = sem_open(thread_signal_done_name, O_CREAT | O_EXCL, 0666, 0);
#else
sem_init(&thread_signal_done, 0, 0);
#endif
// enable signal handler for garbage collection
struct sigaction sa;
@ -104,6 +120,10 @@ void mp_thread_deinit(void) {
free(th);
}
pthread_mutex_unlock(&thread_mutex);
#if defined(__APPLE__)
sem_close(thread_signal_done_p);
sem_unlink(thread_signal_done_name);
#endif
assert(thread->id == pthread_self());
free(thread);
}
@ -125,7 +145,11 @@ void mp_thread_gc_others(void) {
continue;
}
pthread_kill(th->id, SIGUSR1);
#if defined(__APPLE__)
sem_wait(thread_signal_done_p);
#else
sem_wait(&thread_signal_done);
#endif
}
pthread_mutex_unlock(&thread_mutex);
}