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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "foundation/Qt3DS.h"
#include "foundation/Qt3DSSemaphore.h"
#include "foundation/Qt3DSAssert.h"
#include "foundation/Qt3DSAllocator.h"
#include "foundation/Qt3DSAllocatorCallback.h"
#include <errno.h>
#include <stdio.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
namespace qt3ds {
namespace foundation {
class SemaphoreImpl
{
public:
SemaphoreImpl(NVAllocatorCallback &alloc)
: mAllocator(alloc)
{
}
NVAllocatorCallback &mAllocator;
pthread_mutex_t mutex;
pthread_cond_t cond;
QT3DSU32 count;
QT3DSU32 maxCount;
};
struct NVLinuxScopeLock
{
NVLinuxScopeLock(pthread_mutex_t &m)
: mMutex(m)
{
pthread_mutex_lock(&mMutex);
}
~NVLinuxScopeLock() { pthread_mutex_unlock(&mMutex); }
private:
pthread_mutex_t &mMutex;
};
Semaphore::Semaphore(NVAllocatorCallback &alloc, QT3DSU32 initialCount, QT3DSU32 maxCount)
{
mImpl = QT3DS_NEW(alloc, SemaphoreImpl)(alloc);
int status = pthread_mutex_init(&mImpl->mutex, 0);
QT3DS_ASSERT(!status);
status = pthread_cond_init(&mImpl->cond, 0);
QT3DS_ASSERT(!status);
mImpl->count = initialCount;
mImpl->maxCount = maxCount;
QT3DS_ASSERT(initialCount <= maxCount);
}
Semaphore::~Semaphore()
{
pthread_cond_destroy(&mImpl->cond);
pthread_mutex_destroy(&mImpl->mutex);
QT3DS_FREE(mImpl->mAllocator, mImpl);
}
bool Semaphore::wait(QT3DSU32 milliseconds)
{
NVLinuxScopeLock lock(mImpl->mutex);
if (mImpl->count > 0) {
mImpl->count--;
return true;
}
if (milliseconds == 0) {
return false;
}
if (milliseconds == QT3DSU32(-1)) {
int status = pthread_cond_wait(&mImpl->cond, &mImpl->mutex);
QT3DS_ASSERT(!status);
(void)status;
} else {
timespec ts;
timeval tp;
gettimeofday(&tp, NULL);
QT3DSU32 sec = milliseconds / 1000;
QT3DSU32 usec = (milliseconds - 1000 * sec) * 1000;
// sschirm: taking into account that us might accumulate to a second
// otherwise the pthread_cond_timedwait complains on osx.
usec = tp.tv_usec + usec;
QT3DSU32 div_sec = usec / 1000000;
QT3DSU32 rem_usec = usec - div_sec * 1000000;
ts.tv_sec = tp.tv_sec + sec + div_sec;
ts.tv_nsec = rem_usec * 1000;
int ierr = pthread_cond_timedwait(&mImpl->cond, &mImpl->mutex, &ts);
QT3DS_ASSERT((ierr == 0) || (ierr == ETIMEDOUT));
(void)ierr;
return false;
}
return true;
}
void Semaphore::post()
{
NVLinuxScopeLock lock(mImpl->mutex);
mImpl->count++;
if (mImpl->count > mImpl->maxCount)
mImpl->count = mImpl->maxCount;
else {
pthread_cond_broadcast(&mImpl->cond);
}
}
} // namespace foundation
} // namespace qt3ds
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