dthread-win.C

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 * This library is free software; you can redistribute it and/or
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 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
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 */
#include "common/h/dthread.h"
#include <assert.h>

DThread::DThread()
{
}

DThread::~DThread()
{
}

long DThread::self()
{
    return (long)::GetCurrentThread();
}
bool DThread::spawn(DThread::initial_func_t func, void *param)
{
    thrd = ::CreateThread(NULL, 0, func, param, 0, NULL);
    live = (thrd != INVALID_HANDLE_VALUE);
    return live;
}
bool DThread::join()
{
    assert(live && self() != id());
    ::WaitForSingleObject(thrd, INFINITE);
    return true;
}

long DThread::id()
{
    return (long)thrd;
}


Mutex::Mutex(bool recursive)
{
    mutex = ::CreateMutex(NULL, false, NULL);
}

Mutex::~Mutex()
{
    ::CloseHandle(mutex);
}

bool Mutex::lock()
{
    return (::WaitForSingleObject(mutex, INFINITE) == WAIT_OBJECT_0);
}

bool Mutex::unlock()
{
    return ::ReleaseMutex(mutex);
}

CondVar::CondVar(Mutex *m) :
    numWaiting(0),
    was_broadcast(false),
    mutex(m),
    created_mutex(false)
{
    if(mutex == NULL)
    {
        mutex = new Mutex();
        created_mutex = true;
    }
    wait_sema = ::CreateSemaphore(NULL, 0, 0x7FFFFFFF, NULL);
    ::InitializeCriticalSection(&numWaitingLock);
    wait_done = ::CreateEvent(NULL, false, false, NULL);
}
CondVar::~CondVar()
{
    if(created_mutex)
    {
        delete mutex;
    }
    ::CloseHandle(wait_sema);
    ::CloseHandle(wait_done);
}

bool CondVar::unlock()
{
    mutex->unlock();
    return true;
}
bool CondVar::lock()
{
    mutex->lock();
    return true;
}
bool CondVar::signal()
{
    mutex->lock();
    ::EnterCriticalSection(&numWaitingLock);
    bool waitingThreads = (numWaiting > 0);
    ::LeaveCriticalSection(&numWaitingLock);
    if(waitingThreads)
    {
        ::ReleaseSemaphore(wait_sema, 1, 0);
    }
    mutex->unlock();
    return true;
}
bool CondVar::broadcast()
{
    mutex->lock();
    ::EnterCriticalSection(&numWaitingLock);
    bool waitingThreads = (numWaiting > 0);
    was_broadcast = true;
    if(waitingThreads)
    {
        ::ReleaseSemaphore(wait_sema, 1, 0);
        ::LeaveCriticalSection(&numWaitingLock);
        ::WaitForSingleObject(wait_done, INFINITE);
        was_broadcast = false;
    }
    else
    {
        ::LeaveCriticalSection(&numWaitingLock);
    }
    mutex->unlock();
    return true;
}
bool CondVar::wait()
{
    mutex->lock();
    ::EnterCriticalSection(&numWaitingLock);
    numWaiting++;
    ::LeaveCriticalSection(&numWaitingLock);
    ::SignalObjectAndWait(mutex->mutex, wait_sema, INFINITE, FALSE);
    ::EnterCriticalSection(&numWaitingLock);
    numWaiting--;
    bool last_waiter = (was_broadcast && (numWaiting == 0));
    ::LeaveCriticalSection(&numWaitingLock);
    if(last_waiter)
    {
        ::SignalObjectAndWait(wait_done, mutex->mutex, INFINITE, FALSE);
    }
    else
    {
        ::WaitForSingleObject(mutex->mutex, INFINITE);
    }
    mutex->unlock();
    return true;
}