81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
// Copyright 2004-present Facebook. All Rights Reserved.
|
|
|
|
#pragma once
|
|
|
|
#include "MessageQueueThread.h"
|
|
|
|
#include <atomic>
|
|
#include <functional>
|
|
#include <chrono>
|
|
#include <mutex>
|
|
#include <thread>
|
|
#include <memory>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
namespace detail {
|
|
template<bool clearOnWait>
|
|
class CVFlag {
|
|
public:
|
|
using time_point = std::chrono::steady_clock::time_point;
|
|
void set() {
|
|
std::lock_guard<std::mutex> lk(mtx_);
|
|
flag_ = true;
|
|
cv_.notify_one();
|
|
}
|
|
|
|
void wait() {
|
|
std::unique_lock<std::mutex> lk(mtx_);
|
|
cv_.wait(lk, [this] { return flag_; });
|
|
if (clearOnWait) flag_ = false;
|
|
}
|
|
|
|
bool wait_until(time_point d) {
|
|
std::unique_lock<std::mutex> lk(mtx_);
|
|
bool res = cv_.wait_until(lk, d, [this] { return flag_; });
|
|
if (clearOnWait && res) flag_ = false;
|
|
return res;
|
|
}
|
|
|
|
private:
|
|
bool flag_{false};
|
|
std::condition_variable cv_;
|
|
std::mutex mtx_;
|
|
};
|
|
|
|
using BinarySemaphore = CVFlag<true>;
|
|
using EventFlag = CVFlag<false>;
|
|
}
|
|
|
|
class CxxMessageQueue : public MessageQueueThread {
|
|
public:
|
|
CxxMessageQueue();
|
|
virtual ~CxxMessageQueue() override;
|
|
virtual void runOnQueue(std::function<void()>&&) override;
|
|
void runOnQueueDelayed(std::function<void()>&&, uint64_t delayMs);
|
|
// runOnQueueSync and quitSynchronous are dangerous. They should only be
|
|
// used for initialization and cleanup.
|
|
virtual void runOnQueueSync(std::function<void()>&&) override;
|
|
// Once quitSynchronous() returns, no further work should run on the queue.
|
|
virtual void quitSynchronous() override;
|
|
|
|
bool isOnQueue();
|
|
|
|
// This returns a function that will actually run the runloop.
|
|
// This runloop will return some time after quitSynchronous (or after this is destroyed).
|
|
//
|
|
// When running the runloop, it is important to ensure that no frames in the
|
|
// current stack have a strong reference to the queue.
|
|
//
|
|
// Only one thread should run the runloop.
|
|
static std::function<void()> getRunLoop(std::shared_ptr<CxxMessageQueue> mq);
|
|
|
|
static std::weak_ptr<CxxMessageQueue> current();
|
|
private:
|
|
class QueueRunner;
|
|
std::shared_ptr<QueueRunner> qr_;
|
|
};
|
|
|
|
}}
|