sal/osl/w32/semaphor.c

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   9  * $RCSfile: semaphor.c,v $
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  30
  31 #include "system.h"
  32
  33 #include <osl/diagnose.h>
  34 #include <osl/semaphor.h>
  35
  36 /*
  37     Implemetation notes:
  38     The void* represented by oslSemaphore is used
  39     to store a WIN32 HANDLE.
  40 */
  41
  42
  43 /*****************************************************************************/
  44 /* osl_createSemaphore */
  45 /*****************************************************************************/
  46 oslSemaphore SAL_CALL osl_createSemaphore(sal_uInt32 initialCount)
  47 {
  48     oslSemaphore Semaphore;
  49
  50     Semaphore= CreateSemaphore(0, initialCount, INT_MAX, 0);
  51
  52     /* create failed? */
  53     if((HANDLE)Semaphore == INVALID_HANDLE_VALUE)
  54     {
  55         Semaphore= 0;
  56     }
  57
  58     return Semaphore;
  59 }
  60
  61 /*****************************************************************************/
  62 /* osl_destroySemaphore */
  63 /*****************************************************************************/
  64 void SAL_CALL osl_destroySemaphore(oslSemaphore Semaphore)
  65 {
  66
  67
  68     if(Semaphore != 0)
  69     {
  70         CloseHandle((HANDLE)Semaphore);
  71     }
  72
  73 }
  74
  75 /*****************************************************************************/
  76 /* osl_acquireSemaphore */
  77 /*****************************************************************************/
  78 sal_Bool SAL_CALL osl_acquireSemaphore(oslSemaphore Semaphore)
  79 {
  80     OSL_ASSERT(Semaphore != 0);
  81
  82     switch ( WaitForSingleObject( (HANDLE)Semaphore, INFINITE ) )
  83     {
  84         case WAIT_OBJECT_0:
  85             return sal_True;
  86
  87         default:
  88             return (sal_False);
  89     }
  90 }
  91
  92 /*****************************************************************************/
  93 /* osl_tryToAcquireSemaphore */
  94 /*****************************************************************************/
  95 sal_Bool SAL_CALL osl_tryToAcquireSemaphore(oslSemaphore Semaphore)
  96 {
  97     OSL_ASSERT(Semaphore != 0);
  98     return (sal_Bool)(WaitForSingleObject((HANDLE)Semaphore, 0) == WAIT_OBJECT_0);
  99 }
 100
 101
 102 /*****************************************************************************/
 103 /* osl_releaseSemaphore */
 104 /*****************************************************************************/
 105 sal_Bool SAL_CALL osl_releaseSemaphore(oslSemaphore Semaphore)
 106 {
 107     OSL_ASSERT(Semaphore != 0);
 108
 109     /* increase count by one, not interested in previous count */
 110     return (sal_Bool)(ReleaseSemaphore((HANDLE)Semaphore, 1, NULL) != FALSE);
 111 }
 112
 113
 114