38 lines
704 B
C
38 lines
704 B
C
#ifndef __zemaphore_h__
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#define __zemaphore_h__
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typedef struct __Zem_t {
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int value;
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pthread_cond_t cond;
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pthread_mutex_t lock;
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} Zem_t;
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void Zem_init(Zem_t *z, int value) {
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z->value = value;
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Cond_init(&z->cond);
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Mutex_init(&z->lock);
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}
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void Zem_wait(Zem_t *z) {
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Mutex_lock(&z->lock);
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while (z->value <= 0)
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Cond_wait(&z->cond, &z->lock);
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z->value--;
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Mutex_unlock(&z->lock);
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}
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void Zem_post(Zem_t *z) {
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Mutex_lock(&z->lock);
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z->value++;
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Cond_signal(&z->cond);
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Mutex_unlock(&z->lock);
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}
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typedef Zem_t sem_t;
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#define Sem_wait(s) Zem_wait(s)
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#define Sem_post(s) Zem_post(s)
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#define Sem_init(s, v) Zem_init(s, v)
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#endif // __zemaphore_h__
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