sal/osl/unx/semaphor.c

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  28
  29
  30 #include "system.h"
  31
  32 #include <osl/semaphor.h>
  33 #include <osl/diagnose.h>
  34
  35 /* This is the (default) POSIX thread-local semaphore variant */
  36
  37 /*
  38     Implemetation notes:
  39     The void* represented by oslSemaphore is used
  40     as a pointer to an sem_t struct
  41 */
  42
  43 /*****************************************************************************/
  44 /* osl_createSemaphore  */
  45 /*****************************************************************************/
  46
  47 oslSemaphore SAL_CALL osl_createSemaphore(sal_uInt32 initialCount)
  48 {
  49     int ret = 0;
  50     oslSemaphore Semaphore;
  51
  52     Semaphore= malloc(sizeof(sem_t));
  53
  54     OSL_ASSERT(Semaphore);      /* ptr valid? */
  55
  56     if ( Semaphore == 0 )
  57     {
  58         return 0;
  59     }
  60
  61     /* unnamed semaphore, not shared between processes */
  62
  63        ret= sem_init((sem_t*)Semaphore, 0, initialCount);
  64
  65     /* create failed? */
  66     if (ret != 0)
  67     {
  68         OSL_TRACE("osl_createSemaphore failed. Errno: %d; %s\n",
  69                   errno,
  70                   strerror(errno));
  71
  72         free(Semaphore);
  73         Semaphore = NULL;
  74     }
  75
  76     return Semaphore;
  77 }
  78
  79 /*****************************************************************************/
  80 /* osl_destroySemaphore  */
  81 /*****************************************************************************/
  82 void SAL_CALL osl_destroySemaphore(oslSemaphore Semaphore)
  83 {
  84     if(Semaphore)           /* ptr valid? */
  85     {
  86         sem_destroy((sem_t*)Semaphore);
  87         free(Semaphore);
  88     }
  89 }
  90
  91 /*****************************************************************************/
  92 /* osl_acquireSemaphore  */
  93 /*****************************************************************************/
  94 sal_Bool SAL_CALL osl_acquireSemaphore(oslSemaphore Semaphore) {
  95
  96     OSL_ASSERT(Semaphore != 0); /* abort in debug mode */
  97
  98     if (Semaphore != 0)     /* be tolerant in release mode */
  99     {
 100         return (sem_wait((sem_t*)Semaphore) == 0);
 101     }
 102
 103     return sal_False;
 104 }
 105
 106 /*****************************************************************************/
 107 /* osl_tryToAcquireSemaphore  */
 108 /*****************************************************************************/
 109 sal_Bool SAL_CALL osl_tryToAcquireSemaphore(oslSemaphore Semaphore) {
 110
 111     OSL_ASSERT(Semaphore != 0); /* abort in debug mode */
 112     if (Semaphore != 0)     /* be tolerant in release mode */
 113     {
 114         return (sem_trywait((sem_t*)Semaphore) == 0);
 115     }
 116
 117     return sal_False;
 118 }
 119
 120 /*****************************************************************************/
 121 /* osl_releaseSemaphore  */
 122 /*****************************************************************************/
 123 sal_Bool SAL_CALL osl_releaseSemaphore(oslSemaphore Semaphore) {
 124
 125     OSL_ASSERT(Semaphore != 0);     /* abort in debug mode */
 126
 127     if (Semaphore != 0)         /* be tolerant in release mode */
 128     {
 129         return (sem_post((sem_t*)Semaphore) == 0);
 130     }
 131
 132     return sal_False;
 133 }
 134
 135 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */