进程间信号互斥

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sem_trywait[fail]->sem_post->sem_timedwait->write/read

sem_trywait[succ]->sem_post->sem_timedwait->write/read-sem_post

int sem_timedwait_millsecs(sem_t *sem, long msecs)

{

struct timespec ts;

clock_gettime(CLOCK_REALTIME, &ts);

long secs = msecs/1000;

msecs = msecs%1000;

long add = 0;

msecs = msecs*1000*1000 + ts.tv_nsec;

add = msecs / (1000*1000*1000);

ts.tv_sec += (add + secs);

ts.tv_nsec = msecs%(1000*1000*1000);

return sem_timedwait(sem, &ts);

}

创建并初始化时的锁定

windows / mutex

Linux / link: PTHREAD_PROCESS_SHARED cond mutex

来源：python脚本自动迁移