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Working semaphore implementation by Sjoerd.
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parent
dd5db43905
commit
7af8130857
1 changed files with 64 additions and 3 deletions
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@ -263,32 +263,93 @@ void release_lock _P1(lock, type_lock lock)
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/*
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* Semaphore support.
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*/
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/* NOTE: 100% non-functional at this time - tim */
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struct semaphore {
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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int value;
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};
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type_sema allocate_sema _P1(value, int value)
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{
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char *sema = 0;
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struct semaphore *sema;
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int status, error = 0;
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dprintf(("allocate_sema called\n"));
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if (!initialized)
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init_thread();
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sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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if (sema != NULL) {
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sema->value = value;
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status = pthread_mutex_init(&sema->mutex,
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pthread_mutexattr_default);
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CHECK_STATUS("pthread_mutex_init");
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status = pthread_cond_init(&sema->cond,
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pthread_condattr_default);
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CHECK_STATUS("pthread_cond_init");
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if (error) {
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free((void *) sema);
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sema = NULL;
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}
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}
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dprintf(("allocate_sema() -> %lx\n", (long) sema));
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return (type_sema) sema;
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}
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void free_sema _P1(sema, type_sema sema)
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{
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int status, error = 0;
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struct semaphore *thesema = (struct semaphore *) sema;
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dprintf(("free_sema(%lx) called\n", (long) sema));
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status = pthread_cond_destroy(&thesema->cond);
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CHECK_STATUS("pthread_cond_destroy");
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status = pthread_mutex_destroy(&thesema->mutex);
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CHECK_STATUS("pthread_mutex_destroy");
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free((void *) thesema);
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}
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int down_sema _P2(sema, type_sema sema, waitflag, int waitflag)
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{
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int status, error = 0, success;
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struct semaphore *thesema = (struct semaphore *) sema;
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dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
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status = pthread_mutex_lock(&thesema->mutex);
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CHECK_STATUS("pthread_mutex_lock");
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if (waitflag) {
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while (!error && thesema->value <= 0) {
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status = pthread_cond_wait(&thesema->cond,
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&thesema->mutex);
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CHECK_STATUS("pthread_cond_wait");
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}
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}
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if (error)
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success = 0;
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else if (thesema->value > 0) {
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thesema->value--;
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success = 1;
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}
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else
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success = 0;
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status = pthread_mutex_unlock(&thesema->mutex);
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CHECK_STATUS("pthread_mutex_unlock");
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dprintf(("down_sema(%lx) return\n", (long) sema));
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return -1;
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return success;
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}
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void up_sema _P1(sema, type_sema sema)
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{
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int status, error = 0;
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struct semaphore *thesema = (struct semaphore *) sema;
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dprintf(("up_sema(%lx)\n", (long) sema));
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status = pthread_mutex_lock(&thesema->mutex);
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CHECK_STATUS("pthread_mutex_lock");
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thesema->value++;
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status = pthread_cond_signal(&thesema->cond);
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CHECK_STATUS("pthread_cond_signal");
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status = pthread_mutex_unlock(&thesema->mutex);
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CHECK_STATUS("pthread_mutex_unlock");
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}
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