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comparison src/thread/generic/SDL_syssem.c @ 1627:aee7ea396f59

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Fixed bug #179 SDL_SemValue() always returns 0. That's because the underlying POSIX sem_getvalue() is implemented as a noop in Mac OS X. Apart from that, semaphores do work properly (at least according to test/testsem), so I'm not sure if this is worth fixing at all.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 14:04:13 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
comparison
equal deleted inserted replaced
1626:a80e1e0880b8 1627:aee7ea396f59
85 SDL_sem *sem; 85 SDL_sem *sem;
86 86
87 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); 87 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
88 if ( ! sem ) { 88 if ( ! sem ) {
89 SDL_OutOfMemory(); 89 SDL_OutOfMemory();
90 return(0); 90 return NULL;
91 } 91 }
92 sem->count = initial_value; 92 sem->count = initial_value;
93 sem->waiters_count = 0; 93 sem->waiters_count = 0;
94 94
95 sem->count_lock = SDL_CreateMutex(); 95 sem->count_lock = SDL_CreateMutex();
96 sem->count_nonzero = SDL_CreateCond(); 96 sem->count_nonzero = SDL_CreateCond();
97 if ( ! sem->count_lock || ! sem->count_nonzero ) { 97 if ( ! sem->count_lock || ! sem->count_nonzero ) {
98 SDL_DestroySemaphore(sem); 98 SDL_DestroySemaphore(sem);
99 return(0); 99 return NULL;
100 } 100 }
101 101
102 return(sem); 102 return sem;
103 } 103 }
104 104
105 /* WARNING: 105 /* WARNING:
106 You cannot call this function when another thread is using the semaphore. 106 You cannot call this function when another thread is using the semaphore.
107 */ 107 */
112 while ( sem->waiters_count > 0) { 112 while ( sem->waiters_count > 0) {
113 SDL_CondSignal(sem->count_nonzero); 113 SDL_CondSignal(sem->count_nonzero);
114 SDL_Delay(10); 114 SDL_Delay(10);
115 } 115 }
116 SDL_DestroyCond(sem->count_nonzero); 116 SDL_DestroyCond(sem->count_nonzero);
117 SDL_mutexP(sem->count_lock); 117 if ( sem->count_lock ) {
118 SDL_mutexV(sem->count_lock); 118 SDL_mutexP(sem->count_lock);
119 SDL_DestroyMutex(sem->count_lock); 119 SDL_mutexV(sem->count_lock);
120 SDL_DestroyMutex(sem->count_lock);
121 }
120 SDL_free(sem); 122 SDL_free(sem);
121 } 123 }
122 } 124 }
123 125
124 int SDL_SemTryWait(SDL_sem *sem) 126 int SDL_SemTryWait(SDL_sem *sem)