100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
/*
|
|
* AsyncTaskThread.h
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef __ASYNC_TASK_THREAD_H__
|
|
#define __ASYNC_TASK_THREAD_H__
|
|
|
|
#include <thread>
|
|
#include <memory>
|
|
#include <mutex>
|
|
|
|
#include "flow/network.h"
|
|
#include "flow/ThreadHelper.actor.h"
|
|
#include "flow/ThreadSafeQueue.h"
|
|
|
|
class IAsyncTask {
|
|
public:
|
|
virtual void operator()() = 0;
|
|
virtual ~IAsyncTask() = default;
|
|
virtual bool isTerminate() const = 0;
|
|
};
|
|
|
|
template <class F>
|
|
class AsyncTask final : public IAsyncTask {
|
|
F func;
|
|
|
|
public:
|
|
AsyncTask(const F& func) : func(func) {}
|
|
|
|
void operator()() override { func(); }
|
|
bool isTerminate() const override { return false; }
|
|
};
|
|
|
|
class AsyncTaskThread {
|
|
ThreadSafeQueue<std::unique_ptr<IAsyncTask>> queue;
|
|
std::condition_variable cv;
|
|
std::mutex m;
|
|
std::thread thread;
|
|
|
|
static void run(AsyncTaskThread* self);
|
|
|
|
template <class F>
|
|
void addTask(const F& func) {
|
|
bool wakeUp = false;
|
|
{
|
|
std::lock_guard<std::mutex> g(m);
|
|
wakeUp = queue.push(std::make_unique<AsyncTask<F>>(func));
|
|
}
|
|
if (wakeUp) {
|
|
cv.notify_one();
|
|
}
|
|
}
|
|
|
|
static const double meanDelay;
|
|
|
|
public:
|
|
AsyncTaskThread();
|
|
|
|
// Warning: This destructor can hang if a task hangs, so it is
|
|
// up to the caller to prevent tasks from hanging indefinitely
|
|
~AsyncTaskThread();
|
|
|
|
template <class F>
|
|
auto execAsync(const F& func, TaskPriority priority = TaskPriority::DefaultOnMainThread)
|
|
-> Future<decltype(func())> {
|
|
if (g_network->isSimulated()) {
|
|
return map(delayJittered(meanDelay), [func](Void _) { return func(); });
|
|
}
|
|
Promise<decltype(func())> promise;
|
|
addTask([promise, func, priority] {
|
|
try {
|
|
auto funcResult = func();
|
|
onMainThreadVoid([promise, funcResult] { promise.send(funcResult); }, nullptr, priority);
|
|
} catch (Error& e) {
|
|
TraceEvent("ErrorExecutingAsyncTask").error(e);
|
|
onMainThreadVoid([promise, e] { promise.sendError(e); }, nullptr, priority);
|
|
}
|
|
});
|
|
return promise.getFuture();
|
|
}
|
|
};
|
|
|
|
#endif
|