jack2/windows/JackWinThread.cpp

/*
Copyright (C) 2001 Paul Davis 
Copyright (C) 2004-2006 Grame

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "JackWinThread.h"
#include "JackError.h"

namespace Jack
{

DWORD WINAPI JackWinThread::ThreadHandler(void* arg)
{
    JackWinThread* obj = (JackWinThread*)arg;
    JackRunnableInterface* runnable = obj->fRunnable;

    // Call Init method
    if (!runnable->Init()) {
        jack_error("Thread init fails: thread quits");
        return 0;
    }

    // Signal creation thread when started with StartSync
    if (!obj->fRunning) {
        obj->fRunning = true;
        SetEvent(obj->fEvent);
    }

    JackLog("ThreadHandler: start\n");

    // If Init succeed start the thread loop
    bool res = true;
    while (obj->fRunning && res) {
        res = runnable->Execute();
    }

    SetEvent(obj->fEvent);
    JackLog("ThreadHandler: exit\n");
    return 0;
}

int JackWinThread::Start()
{
    DWORD id;

    fEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
    if (fEvent == NULL) {
        jack_error("Cannot create event error = %d", GetLastError());
        return -1;
    }

    fRunning = true;

    if (fRealTime) {

        JackLog("Create RT thread\n");
        fThread = CreateThread(NULL, 0, ThreadHandler, (void*)this, 0, &id);

        if (fThread == NULL) {
            jack_error("Cannot create thread error = %d", GetLastError());
            return -1;
        }

        if (!SetThreadPriority(fThread, THREAD_PRIORITY_TIME_CRITICAL)) {
            jack_error("Cannot set priority class = %d", GetLastError());
            return -1;
        }

        return 0;

    } else {

        JackLog("Create non RT thread\n");
        fThread = CreateThread(NULL, 0, ThreadHandler, (void*)this, 0, &id);

        if (fThread == NULL) {
            jack_error("Cannot create thread error = %d", GetLastError());
            return -1;
        }

        return 0;
    }
}

int JackWinThread::StartSync()
{
    DWORD id;

    fEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
    if (fEvent == NULL) {
        jack_error("Cannot create event error = %d", GetLastError());
        return -1;
    }

    if (fRealTime) {

        JackLog("Create RT thread\n");
        fThread = CreateThread(NULL, 0, ThreadHandler, (void*)this, 0, &id);

        if (fThread == NULL) {
            jack_error("Cannot create thread error = %d", GetLastError());
            return -1;
        }

        if (WaitForSingleObject(fEvent, 3000) != WAIT_OBJECT_0) { // wait 3 sec
            jack_error("Thread has not started");
            return -1;
        }

        if (!SetThreadPriority(fThread, THREAD_PRIORITY_TIME_CRITICAL)) {
            jack_error("Cannot set priority class = %d", GetLastError());
            return -1;
        }

        return 0;

    } else {

        JackLog("Create non RT thread\n");
        fThread = CreateThread(NULL, 0, ThreadHandler, (void*)this, 0, &id);

        if (fThread == NULL) {
            jack_error("Cannot create thread error = %d", GetLastError());
            return -1;
        }

        if (WaitForSingleObject(fEvent, 3000) != WAIT_OBJECT_0) { // wait 3 sec
            jack_error("Thread has not started");
            return -1;
        }

        return 0;
    }
}

// voir http://www.microsoft.com/belux/msdn/nl/community/columns/ldoc/multithread1.mspx

int JackWinThread::Kill()
{
    if (fThread) { // If thread has been started
        JackLog("JackWinThread::Kill\n");
        TerminateThread(fThread, 0); /// TO CHECK : dangerous
        CloseHandle(fThread);
        CloseHandle(fEvent);
        return 0;
    } else {
        return -1;
    }
}

int JackWinThread::Stop()
{
    if (fThread) { // If thread has been started
        JackLog("JackWinThread::Stop\n");
        fRunning = false; // Request for the thread to stop
        WaitForSingleObject(fEvent, INFINITE);
        CloseHandle(fThread);
        CloseHandle(fEvent);
        return 0;
    } else {
        CloseHandle(fEvent);
        return -1;
    }
}

int JackWinThread::AcquireRealTime()
{
    JackLog("JackWinThread::AcquireRealTime\n");

    if (fThread) {
        if (!SetThreadPriority(fThread, THREAD_PRIORITY_TIME_CRITICAL)) {
            jack_error("Cannot set thread priority = %d", GetLastError());
            return -1;
        }
        JackLog("JackWinThread::AcquireRealTime OK\n");
        return 0;
    } else {
        CloseHandle(fEvent);
        return -1;
    }
}

int JackWinThread::AcquireRealTime(int priority)
{
    JackLog("JackWinThread::AcquireRealTime priority = %ld\n", priority);
    return AcquireRealTime();
}

int JackWinThread::DropRealTime()
{
    if (fThread) {
        if (!SetThreadPriority(fThread, THREAD_PRIORITY_NORMAL)) {
            jack_error("Cannot set thread priority = %d", GetLastError());
            return -1;
        }
        return 0;
    } else {
        return -1;
    }
}

pthread_t JackWinThread::GetThreadID()
{
    return fThread;
}

} // end of namespace