How to initialise a binary semaphore in C?

If you want a strictly binary semaphore on Linux, I suggest building one out of mutexes and condition variables.

If you want a strictly binary semaphore on Linux, I suggest building one out of mutexes and condition variables. Struct binary_semaphore { pthread_mutex_t mutex; pthread_cond_t cvar; int v; }; void mysem_post(struct binary_semaphore *p) { pthread_mutex_lock(&p->mutex); if (p->v == 1) /* error */ p->v += 1; pthread_cond_signal(&p->cvar); pthread_mutex_unlock(&p->mutex); } void mysem_wait(struct binar_semaphore *p) { pthread_mutex_lock(&p->mutex); while (!p->v) pthread_cond_wait(&p->cvar, &p->mutex); p->v -= 1; pthread_mutex_unlock(&p->mutex); }.

Great thanks! I had ended up doing pretty much that. – austinmarton Sep 20 at 0:56.

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