sal/osl/w32/conditn.c

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   5  * Copyright 2008 by Sun Microsystems, Inc.
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   9  * $RCSfile: conditn.c,v $
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  30
  31 #include "system.h"
  32
  33 #include <osl/conditn.h>
  34 #include <osl/diagnose.h>
  35 #include <osl/time.h>
  36
  37 /*
  38     under WIN32, we use the void* oslCondition
  39     as a WIN32 HANDLE (which is also a 32-bit value)
  40 */
  41
  42 /*****************************************************************************/
  43 /* osl_createCondition */
  44 /*****************************************************************************/
  45 oslCondition SAL_CALL osl_createCondition(void)
  46 {
  47     oslCondition Condition;
  48
  49     Condition= (oslCondition)CreateEvent(0,                     /* no security */
  50                                          sal_True,              /* manual reset */
  51                                          sal_False,             /* initial state not signaled */
  52                                          0);            /* automatic name */
  53
  54     return Condition;
  55
  56 }
  57
  58 /*****************************************************************************/
  59 /* osl_destroyCondition */
  60 /*****************************************************************************/
  61 void SAL_CALL osl_destroyCondition(oslCondition Condition)
  62 {
  63     if(Condition)
  64     {
  65         OSL_VERIFY(CloseHandle(Condition));
  66     }
  67 }
  68
  69 /*****************************************************************************/
  70 /* osl_setCondition */
  71 /*****************************************************************************/
  72 sal_Bool SAL_CALL osl_setCondition(oslCondition Condition)
  73 {
  74     OSL_ASSERT(Condition);
  75
  76     return (sal_Bool)(SetEvent((HANDLE)Condition) != FALSE);
  77 }
  78
  79 /*****************************************************************************/
  80 /* osl_resetCondition */
  81 /*****************************************************************************/
  82 sal_Bool SAL_CALL osl_resetCondition(oslCondition Condition)
  83 {
  84     OSL_ASSERT(Condition);
  85
  86     return (sal_Bool)(ResetEvent((HANDLE)Condition) != FALSE);
  87 }
  88
  89 /*****************************************************************************/
  90 /* osl_waitCondition */
  91 /*****************************************************************************/
  92 oslConditionResult SAL_CALL osl_waitCondition(oslCondition Condition,
  93                                      const TimeValue* pTimeout)
  94 {
  95     DWORD timeout;
  96
  97     OSL_ASSERT(Condition);
  98
  99     if (pTimeout)
 100         timeout = pTimeout->Seconds * 1000 + pTimeout->Nanosec / 1000000L;
 101     else
 102         timeout = INFINITE;
 103
 104     /* It's necessary to process SendMessage calls to the current thread to give other threads
 105         access to COM objects instatiated in this thread */
 106
 107     while ( 1 )
 108     {
 109         /* Only wake up if a SendMessage call to the threads message loop is detected */
 110         switch( MsgWaitForMultipleObjects( 1, (HANDLE *)(&Condition), FALSE, timeout, QS_SENDMESSAGE ) )
 111         {
 112             case WAIT_OBJECT_0 + 1:
 113                 {
 114                 MSG     msg;
 115
 116                 /* We Must not dispatch the message. PM_NOREMOVE leaves the message queue untouched
 117                  but dispatches SendMessage calls automatically */
 118
 119                 PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE );
 120                 }
 121                 break;
 122
 123             case WAIT_OBJECT_0:
 124                 return (osl_cond_result_ok);
 125
 126             case WAIT_TIMEOUT:
 127                 return (osl_cond_result_timeout);
 128
 129             default:
 130                 return (osl_cond_result_error);
 131         }
 132     }
 133 }
 134
 135 /*****************************************************************************/
 136 /* osl_checkCondition */
 137 /*****************************************************************************/
 138 sal_Bool SAL_CALL osl_checkCondition(oslCondition Condition)
 139 {
 140     OSL_ASSERT(Condition);
 141
 142     return (sal_Bool)(WaitForSingleObject((HANDLE)Condition, 0) == WAIT_OBJECT_0);
 143 }
 144