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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qohoseventdispatcher.h"
#include "qohosjsmain.h"
#include "qohosdeadlockprotector.h"
QOhosEventDispatcher::QOhosEventDispatcher(QObject *parent) :
QUnixEventDispatcherQPA(parent)
{
if (QtOhos::blockEventLoopsWhenSuspended())
QOhosEventDispatcherStopper::instance()->addEventDispatcher(this);
}
QOhosEventDispatcher::~QOhosEventDispatcher()
{
if (QtOhos::blockEventLoopsWhenSuspended())
QOhosEventDispatcherStopper::instance()->removeEventDispatcher(this);
}
enum States {Running = 0, StopRequest = 1, Stopping = 2};
void QOhosEventDispatcher::start()
{
int prevState = m_stopRequest.fetchAndStoreAcquire(Running);
if (prevState == Stopping) {
m_semaphore.release();
wakeUp();
} else if (prevState == Running) {
qWarning("Error: start without corresponding stop");
}
//else if prevState == StopRequest, no action needed
}
void QOhosEventDispatcher::stop()
{
if (m_stopRequest.testAndSetAcquire(Running, StopRequest))
wakeUp();
else
qWarning("Error: start/stop out of sync");
}
void QOhosEventDispatcher::goingToStop(bool stop)
{
m_goingToStop.storeRelaxed(stop);
if (!stop)
wakeUp();
}
bool QOhosEventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)
{
if (m_goingToStop.loadRelaxed())
flags |= QEventLoop::ExcludeSocketNotifiers | QEventLoop::X11ExcludeTimers;
{
QOhosDeadlockProtector protector;
if (protector.acquire() && m_stopRequest.testAndSetAcquire(StopRequest, Stopping)) {
m_semaphore.acquire();
wakeUp();
}
}
return QUnixEventDispatcherQPA::processEvents(flags);
}
QOhosEventDispatcherStopper *QOhosEventDispatcherStopper::instance()
{
static QOhosEventDispatcherStopper ohosEventDispatcherStopper;
return &ohosEventDispatcherStopper;
}
void QOhosEventDispatcherStopper::startAll()
{
QMutexLocker lock(&m_mutex);
if (!m_started.testAndSetOrdered(0, 1))
return;
for (QOhosEventDispatcher *d : std::as_const(m_dispatchers))
d->start();
}
void QOhosEventDispatcherStopper::stopAll()
{
QMutexLocker lock(&m_mutex);
if (!m_started.testAndSetOrdered(1, 0))
return;
for (QOhosEventDispatcher *d : std::as_const(m_dispatchers))
d->stop();
}
void QOhosEventDispatcherStopper::addEventDispatcher(QOhosEventDispatcher *dispatcher)
{
QMutexLocker lock(&m_mutex);
m_dispatchers.push_back(dispatcher);
}
void QOhosEventDispatcherStopper::removeEventDispatcher(QOhosEventDispatcher *dispatcher)
{
QMutexLocker lock(&m_mutex);
m_dispatchers.erase(std::find(m_dispatchers.begin(), m_dispatchers.end(), dispatcher));
}
void QOhosEventDispatcherStopper::goingToStop(bool stop)
{
QMutexLocker lock(&m_mutex);
for (QOhosEventDispatcher *d : std::as_const(m_dispatchers))
d->goingToStop(stop);
}