97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "core/main_queue_processor.h"
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namespace Core {
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namespace {
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QMutex ProcessorMutex;
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MainQueueProcessor *ProcessorInstance/* = nullptr*/;
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constexpr auto kProcessorEvent = QEvent::Type(QEvent::User + 1);
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static_assert(kProcessorEvent < QEvent::MaxUser);
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class ProcessorEvent : public QEvent {
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public:
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ProcessorEvent(void (*callable)(void*), void *argument);
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void process();
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private:
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void (*_callable)(void*) = nullptr;
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void *_argument = nullptr;
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};
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ProcessorEvent::ProcessorEvent(void (*callable)(void*), void *argument)
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: QEvent(kProcessorEvent)
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, _callable(callable)
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, _argument(argument) {
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}
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void ProcessorEvent::process() {
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_callable(_argument);
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}
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void ProcessMainQueue(void (*callable)(void*), void *argument) {
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QMutexLocker lock(&ProcessorMutex);
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if (ProcessorInstance) {
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const auto event = new ProcessorEvent(callable, argument);
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QCoreApplication::postEvent(ProcessorInstance, event);
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}
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}
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} // namespace
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MainQueueProcessor::MainQueueProcessor() {
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acquire();
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crl::init_main_queue(ProcessMainQueue);
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}
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bool MainQueueProcessor::event(QEvent *event) {
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if (event->type() == kProcessorEvent) {
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static_cast<ProcessorEvent*>(event)->process();
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return true;
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}
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return QObject::event(event);
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}
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void MainQueueProcessor::acquire() {
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Expects(ProcessorInstance == nullptr);
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QMutexLocker lock(&ProcessorMutex);
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ProcessorInstance = this;
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}
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void MainQueueProcessor::release() {
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Expects(ProcessorInstance == this);
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QMutexLocker lock(&ProcessorMutex);
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ProcessorInstance = nullptr;
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}
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MainQueueProcessor::~MainQueueProcessor() {
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release();
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}
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} // namespace
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