javacommons/utils/src/monitor.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:30:29 +0300
branchRCL_3
changeset 19 04becd199f91
child 23 98ccebc37403
permissions -rw-r--r--
Revision: v2.1.22 Kit: 201017
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/*
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* Copyright (c) 2007-2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include "logger.h"
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#include "monitor.h"
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#ifndef __SYMBIAN32__
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#include <sys/time.h>
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#include <errno.h>
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#endif
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using namespace java::util;
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Monitor::Monitor() : mWaiting(false), mNotifyBeforeWait(false)
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{
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    JELOG2(EUtils);
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}
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Monitor::~Monitor()
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{
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    JELOG2(EUtils);
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    pthread_mutex_destroy(&mMutex);
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    pthread_cond_destroy(&mCondVar);
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}
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OS_EXPORT Monitor* Monitor::createMonitor()
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{
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    JELOG2(EUtils);
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    int result = -1;
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    Monitor* monitor = new Monitor();
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    if (monitor)
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    {
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        result = pthread_mutex_init(&monitor->mMutex, 0);
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        if (result == 0)
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        {
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            result = pthread_cond_init(&monitor->mCondVar, 0);
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            if (result != 0)
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            {
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                ELOG(EUtils, "Monitor::createMonitor() "
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                     "pthread_cond_init() failed");
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            }
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        }
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        else
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        {
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            ELOG(EUtils, "Monitor::createMonitor() "
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                 "pthread_mutex_init() failed");
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        }
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    }
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    else
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    {
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        ELOG(EUtils, "Monitor::createMonitor() "
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             "new Monitor() failed");
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    }
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    if (result != 0 && monitor)
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    {
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        delete monitor;
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        monitor = 0;
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    }
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    return monitor;
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}
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OS_EXPORT int Monitor::wait(int timeOut)
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{
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    JELOG4(EUtils, EEntryLog & EInfoHeavyLoad);
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    pthread_mutex_lock(&mMutex);
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    if (!mNotifyBeforeWait)
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    {
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        mWaiting = true;
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        if (timeOut == 0)
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        {
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            while (mWaiting)
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            {
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                pthread_cond_wait(&mCondVar, &mMutex);
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            }
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        }
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        else
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        {
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            struct timeval currentTimeVal;
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            struct timespec timeOutTime;
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            gettimeofday(&currentTimeVal, 0);
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            timeOutTime.tv_sec = currentTimeVal.tv_sec + timeOut / 1000;
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            timeOutTime.tv_nsec =
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                currentTimeVal.tv_usec * 1000 + (timeOut % 1000) * 1000 * 1000;
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            int err = pthread_cond_timedwait(&mCondVar, &mMutex, &timeOutTime);
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            if (err != ETIMEDOUT)
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            {
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                ELOG1(EUtils, "Monitor: Timed wait failed, err = %d", err);
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            }
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        }
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    }
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    else
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    {
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        mNotifyBeforeWait = false;
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    }
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    pthread_mutex_unlock(&mMutex);
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    return 0;
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   112
}
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   113
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   114
OS_EXPORT int Monitor::notify()
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{
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    JELOG4(EUtils, EEntryLog & EInfoHeavyLoad);
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    pthread_mutex_lock(&mMutex);
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    if (mWaiting)
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    {
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        pthread_cond_signal(&mCondVar);
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    }
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    else
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    {
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        mNotifyBeforeWait = true;
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    }
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    mWaiting = false;
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    pthread_mutex_unlock(&mMutex);
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    return 0;
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   129
}