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/*****************************************************************************
* *
* PrimeSense PSCommon Library *
* Copyright (C) 2012 PrimeSense Ltd. *
* *
* This file is part of PSCommon. *
* *
* Licensed 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. *
* *
*****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include <XnOS.h>
#include <XnLog.h>
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnStatus xnOSWaitForCondition(const XN_EVENT_HANDLE EventHandle, XnUInt32 nMilliseconds, XnConditionFunc pConditionFunc, void* pConditionData)
{
XnStatus nRetVal = XN_STATUS_OK;
// take read start time (for timeout purposes)
XnUInt64 nStarted;
nRetVal = xnOSGetTimeStamp(&nStarted);
XN_IS_STATUS_OK(nRetVal);
XnBool bTimeout = FALSE;
// as long as condition isn't met
while (!pConditionFunc(pConditionData))
{
// check if timeout occurred
XnUInt64 nNow;
nRetVal = xnOSGetTimeStamp(&nNow);
XN_IS_STATUS_OK(nRetVal);
if (nNow - nStarted > nMilliseconds)
{
bTimeout = TRUE;
}
else
{
// not yet. Wait for event to be set
nRetVal = xnOSWaitEvent(EventHandle, (XnUInt32)(nMilliseconds - (nNow - nStarted)));
if (nRetVal == XN_STATUS_OS_EVENT_TIMEOUT)
{
bTimeout = TRUE;
}
else if (nRetVal != XN_STATUS_OK)
{
xnLogWarning(XN_MASK_OS, "Failed waiting on event for condition...");
}
}
if (bTimeout)
{
return (XN_STATUS_OS_EVENT_TIMEOUT);
}
}
// condition was met
return (XN_STATUS_OK);
}
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