xref: /trunk/main/sal/osl/w32/conditn.c (revision 534d93521fb9d960038706348aeef53f37423a94)

/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



#include "system.h"

#include <osl/conditn.h>
#include <osl/diagnose.h>
#include <osl/time.h>

/*
    under WIN32, we use the void* oslCondition
    as a WIN32 HANDLE (which is also a 32-bit value)
*/

/*****************************************************************************/
/* osl_createCondition */
/*****************************************************************************/
oslCondition SAL_CALL osl_createCondition(void)
{
    oslCondition Condition;

    Condition= (oslCondition)CreateEvent(0,         /* no security */
                                         sal_True,      /* manual reset */
                                         sal_False,     /* initial state not signaled */
                                         0);        /* automatic name */

    return Condition;

}

/*****************************************************************************/
/* osl_destroyCondition */
/*****************************************************************************/
void SAL_CALL osl_destroyCondition(oslCondition Condition)
{
    if(Condition)
    {
        OSL_VERIFY(CloseHandle(Condition));
    }
}

/*****************************************************************************/
/* osl_setCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_setCondition(oslCondition Condition)
{
    OSL_ASSERT(Condition);

    return (sal_Bool)(SetEvent((HANDLE)Condition) != FALSE);
}

/*****************************************************************************/
/* osl_resetCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_resetCondition(oslCondition Condition)
{
    OSL_ASSERT(Condition);

    return (sal_Bool)(ResetEvent((HANDLE)Condition) != FALSE);
}

/*****************************************************************************/
/* osl_waitCondition */
/*****************************************************************************/
oslConditionResult SAL_CALL osl_waitCondition(oslCondition Condition,
                                     const TimeValue* pTimeout)
{
    DWORD timeout;

    OSL_ASSERT(Condition);

    if (pTimeout)
        timeout = pTimeout->Seconds * 1000 + pTimeout->Nanosec / 1000000L;
    else
        timeout = INFINITE;

    /* It's necessary to process SendMessage calls to the current thread to give other threads
        access to COM objects instantiated in this thread */

    while ( 1 )
    {
        /* Only wake up if a SendMessage call to the threads message loop is detected */
        switch( MsgWaitForMultipleObjects( 1, (HANDLE *)(&Condition), FALSE, timeout, QS_SENDMESSAGE ) )
        {
            case WAIT_OBJECT_0 + 1:
                {
                MSG msg;

                /* We Must not dispatch the message. PM_NOREMOVE leaves the message queue untouched
                 but dispatches SendMessage calls automatically */

                PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE );
                }
                break;

            case WAIT_OBJECT_0:
                return (osl_cond_result_ok);

            case WAIT_TIMEOUT:
                return (osl_cond_result_timeout);

            default:
                return (osl_cond_result_error);
        }
    }
}

/*****************************************************************************/
/* osl_checkCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_checkCondition(oslCondition Condition)
{
    OSL_ASSERT(Condition);

    return (sal_Bool)(WaitForSingleObject((HANDLE)Condition, 0) == WAIT_OBJECT_0);
}