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November 4, 2023 03:34
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Job System
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#pragma once | |
#include <condition_variable> | |
#include <functional> | |
#include <mutex> | |
#include <queue> | |
#include <thread> | |
#include <vector> | |
// Job: 任意のタスクを表すクラス | |
class Job { | |
public: | |
using JobFunction = std::function<void()>; | |
private: | |
JobFunction function; | |
public: | |
Job() = default; | |
Job(JobFunction func) : function(std::move(func)) {} | |
void execute() const { | |
if (function) { | |
function(); | |
} | |
} | |
}; | |
// JobQueue: スレッドセーフなジョブキュー | |
class JobQueue { | |
private: | |
std::queue<Job> jobs; | |
mutable std::mutex queueMutex; | |
std::condition_variable condition; | |
bool stopAll; | |
public: | |
JobQueue() : stopAll(false) {} | |
void push(Job job) { | |
std::lock_guard<std::mutex> lock(queueMutex); | |
jobs.push(std::move(job)); | |
condition.notify_one(); | |
} | |
bool waitAndPop(Job& job) { | |
std::unique_lock<std::mutex> lock(queueMutex); | |
condition.wait(lock, [this] { return stopAll || !jobs.empty(); }); | |
if (!jobs.empty()) { | |
job = std::move(jobs.front()); | |
jobs.pop(); | |
return true; | |
} | |
return false; // キューが空であれば、falseを返す | |
} | |
bool empty() const { | |
std::lock_guard<std::mutex> lock(queueMutex); | |
return jobs.empty(); | |
} | |
void shutdown() { | |
std::lock_guard<std::mutex> lock(queueMutex); | |
stopAll = true; | |
condition.notify_all(); | |
} | |
}; | |
// ThreadPool: ジョブを実行するスレッドのプール | |
class ThreadPool { | |
private: | |
std::vector<std::thread> workers; | |
JobQueue& jobQueue; | |
void workerFunction() const { | |
while (true) { | |
Job job; | |
if (!jobQueue.waitAndPop(job)) { | |
break; // シャットダウンフラグが立っているかキューが空の場合はループを抜ける | |
} | |
try { | |
job.execute(); // ジョブを実行 | |
} catch (const std::exception& e) { | |
std::cerr << "Job execution failed: " << e.what() << std::endl; | |
} | |
} | |
} | |
public: | |
ThreadPool(JobQueue& queue, size_t threadCount) : jobQueue(queue) { | |
for (size_t i = 0; i < threadCount; ++i) { | |
workers.emplace_back(&ThreadPool::workerFunction, this); | |
} | |
} | |
// すべてのジョブを待機してワーカーを終了させる | |
void shutdown() { | |
jobQueue.shutdown(); // キューにシャットダウンを通知 | |
// 全てのワーカースレッドを終了させる | |
for (auto& worker : workers) { | |
if (worker.joinable()) { | |
worker.join(); | |
} | |
} | |
} | |
}; | |
// JobSystem: ジョブを管理するクラス | |
class JobSystem { | |
private: | |
JobQueue jobQueue; | |
ThreadPool threadPool; | |
public: | |
JobSystem(size_t threadCount) : threadPool(jobQueue, threadCount) {} | |
// ジョブを追加する | |
void scheduleJob(Job::JobFunction jobFunction) { jobQueue.push(Job(std::move(jobFunction))); } | |
// シャットダウン処理 | |
void shutdown() { threadPool.shutdown(); } | |
}; |
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