threadPool.h - Opengist

threadPool.cpp · 1.4 KiB · C++ Raw

1
2	#include "threadPool.h"
3
4	ThreadPool::ThreadPool()
5	: m_busyThreads{ 0 }
6	, m_threads{std::vector<std::thread>(std::thread::hardware_concurrency())}
7	, m_stopRequested{ false }
8	{
9	for (size_t i = 0; i < std::thread::hardware_concurrency(); ++i)
10	{
11	m_threads[i] = std::thread(ThreadWorker(this));
12	}
13	}
14
15	ThreadPool::~ThreadPool()
16	{
17	{
18	std::lock_guard<std::mutex> lock(m_mutex);
19	m_stopRequested = true;
20	m_condition_task.notify_all();
21	}
22
23	for (size_t i = 0; i < m_threads.size(); ++i)
24	{
25	if (m_threads[i].joinable())
26	{
27	m_threads[i].join();
28	}
29	}
30	}
31
32	void ThreadPool::wait()
33	{
34	std::unique_lock<std::mutex> lock(m_mutex);
35	m_condition_finish.wait(lock, [this] {
36	return m_tasks.empty() && m_busyThreads == 0;
37	});
38	lock.unlock();
39	}
40
41	ThreadWorker::ThreadWorker(ThreadPool* pool)
42	: m_pool(pool)
43	{}
44
45	ThreadWorker::~ThreadWorker()
46	{}
47
48	void ThreadWorker::operator()()
49	{
50	std::unique_lock<std::mutex> lock(m_pool->m_mutex);
51	while (!m_pool->m_stopRequested \|\| (m_pool->m_stopRequested && !m_pool->m_tasks.empty()))
52	{
53	m_pool->m_condition_task.wait(lock, [this] {
54	return m_pool->m_stopRequested \|\| !m_pool->m_tasks.empty();
55	});
56
57	if (!m_pool->m_tasks.empty())
58	{
59	m_pool->m_busyThreads++;
60
61	auto task = m_pool->m_tasks.front();
62	m_pool->m_tasks.pop();
63	lock.unlock();
64	task();
65	lock.lock();
66
67	m_pool->m_busyThreads--;
68	m_pool->m_condition_finish.notify_one();
69	}
70	}
71	}
72
73

threadPool.h · 1.4 KiB · C Raw

1	#ifndef THREAD_POOL_H
2	#define THREAD_POOL_H
3
4	#include <thread>
5	#include <mutex>
6	#include <condition_variable>
7	#include <functional>
8	#include <future>
9	#include <queue>
10	#include <vector>
11	#include <memory>
12	#include <condition_variable>
13
14	class ThreadPool
15	{
16	public:
17	ThreadPool();
18	~ThreadPool();
19
20	ThreadPool(const ThreadPool&) = delete;
21	ThreadPool(ThreadPool&&) = delete;
22	ThreadPool& operator=(const ThreadPool&) = delete;
23	ThreadPool& operator=(ThreadPool&&) = delete;
24
25	template<typename F, typename... Args>
26	auto enqueue(F&& f, Args&&... args) -> std::future<decltype(f(args...))>
27	{
28	auto task = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
29	auto taskPtr = std::make_shared<std::packaged_task<decltype(f(args...))()>>(task);
30	auto wrapper = [taskPtr]() {
31	(*taskPtr)();
32	};
33
34	{
35	std::lock_guard<std::mutex> lock(m_mutex);
36	m_tasks.push(wrapper);
37	m_condition_task.notify_one();
38	}
39
40	return taskPtr->get_future();
41	}
42	void wait();
43
44	private:
45	mutable std::mutex m_mutex;
46	std::condition_variable m_condition_task;
47	std::condition_variable m_condition_finish;
48	unsigned int m_busyThreads;
49
50	std::vector<std::thread> m_threads;
51	bool m_stopRequested;
52
53	std::queue<std::function<void()>> m_tasks;
54
55	friend class ThreadWorker;
56	};
57
58
59	class ThreadWorker
60	{
61	public:
62	ThreadWorker(ThreadPool* pool);
63	~ThreadWorker();
64
65	void operator()();
66
67	private:
68	ThreadPool* m_pool;
69	};
70
71	#endif // !THREAD_POOL_H