/**************************************************************
 * 
 * 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 instatiated 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);
}