sal/osl/w32/conditn.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "system.h"
  21
  22 #include <osl/conditn.h>
  23 #include <osl/diagnose.h>
  24 #include <osl/time.h>
  25
  26 /*
  27     under WIN32, we use the void* oslCondition
  28     as a WIN32 HANDLE (which is also a 32-bit value)
  29 */
  30
  31 /*****************************************************************************/
  32 /* osl_createCondition */
  33 /*****************************************************************************/
  34 oslCondition SAL_CALL osl_createCondition(void)
  35 {
  36     oslCondition Condition;
  37
  38     Condition= (oslCondition)CreateEvent(0,         /* no security */
  39                                          sal_True,      /* manual reset */
  40                                          sal_False,     /* initial state not signaled */
  41                                          0);        /* automatic name */
  42
  43     return Condition;
  44
  45 }
  46
  47 /*****************************************************************************/
  48 /* osl_destroyCondition */
  49 /*****************************************************************************/
  50 void SAL_CALL osl_destroyCondition(oslCondition Condition)
  51 {
  52     if(Condition)
  53     {
  54         OSL_VERIFY(CloseHandle(Condition));
  55     }
  56 }
  57
  58 /*****************************************************************************/
  59 /* osl_setCondition */
  60 /*****************************************************************************/
  61 sal_Bool SAL_CALL osl_setCondition(oslCondition Condition)
  62 {
  63     OSL_ASSERT(Condition);
  64
  65     return (sal_Bool)(SetEvent((HANDLE)Condition) != FALSE);
  66 }
  67
  68 /*****************************************************************************/
  69 /* osl_resetCondition */
  70 /*****************************************************************************/
  71 sal_Bool SAL_CALL osl_resetCondition(oslCondition Condition)
  72 {
  73     OSL_ASSERT(Condition);
  74
  75     return (sal_Bool)(ResetEvent((HANDLE)Condition) != FALSE);
  76 }
  77
  78 /*****************************************************************************/
  79 /* osl_waitCondition */
  80 /*****************************************************************************/
  81 oslConditionResult SAL_CALL osl_waitCondition(oslCondition Condition,
  82                                      const TimeValue* pTimeout)
  83 {
  84     DWORD timeout;
  85
  86     OSL_ASSERT(Condition);
  87
  88     if (pTimeout)
  89         timeout = pTimeout->Seconds * 1000 + pTimeout->Nanosec / 1000000L;
  90     else
  91         timeout = INFINITE;
  92
  93     /* It's necessary to process SendMessage calls to the current thread to give other threads
  94         access to COM objects instatiated in this thread */
  95
  96     while ( 1 )
  97     {
  98         /* Only wake up if a SendMessage call to the threads message loop is detected */
  99         switch( MsgWaitForMultipleObjects( 1, (HANDLE *)(&Condition), FALSE, timeout, QS_SENDMESSAGE ) )
 100         {
 101             case WAIT_OBJECT_0 + 1:
 102                 {
 103                 MSG msg;
 104
 105                 /* We Must not dispatch the message. PM_NOREMOVE leaves the message queue untouched
 106                  but dispatches SendMessage calls automatically */
 107
 108                 PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE );
 109                 }
 110                 break;
 111
 112             case WAIT_OBJECT_0:
 113                 return (osl_cond_result_ok);
 114
 115             case WAIT_TIMEOUT:
 116                 return (osl_cond_result_timeout);
 117
 118             default:
 119                 return (osl_cond_result_error);
 120         }
 121     }
 122 }
 123
 124 /*****************************************************************************/
 125 /* osl_checkCondition */
 126 /*****************************************************************************/
 127 sal_Bool SAL_CALL osl_checkCondition(oslCondition Condition)
 128 {
 129     OSL_ASSERT(Condition);
 130
 131     return (sal_Bool)(WaitForSingleObject((HANDLE)Condition, 0) == WAIT_OBJECT_0);
 132 }
 133
 134 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */