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https://github.com/Hizenberg469/MultiThreading_Part_A.git
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50 lines
650 B
C
50 lines
650 B
C
#ifndef __SEMA__
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#define __SEMA__
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#include <pthread.h>
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typedef struct sema_ sema_t;
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struct sema_ {
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int permit_counter;
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pthread_cond_t cv;
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pthread_mutex_t mutex;
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};
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sema_t*
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sema_get_new_semaphore();
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void
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sema_init(sema_t* sema, int count);
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void
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sema_wait(sema_t* sema);
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void
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sema_post(sema_t* sema);
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void
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sema_destroy(sema_t* sema);
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int
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sema_getvalue(sema_t* sema);
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/*
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Several texts using P & V notation to represent
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wait and signals
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*/
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#define P(sema) sema_wait(sema)
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#define V(sema) sema_post(sema)
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/*
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Some texts also use up and down
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*/
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#define UP(sema) sema_wait(sema)
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#define DOWN(sema) sema_post(sema)
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#endif /* __SEMA__ */ |