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| #include <future>
#include <mutex>
#include <condition_variable>
#include <queue>
class ThreadPool
{
using Task = std::packaged_task<void()>;
public:
ThreadPool(const ThreadPool&) = delete;
ThreadPool& operator=(const ThreadPool&) = delete;
ThreadPool(ThreadPool&&) = delete;
ThreadPool& operator=(ThreadPool&&) = delete;
ThreadPool(unsigned int threadCount) : m_thread_count(threadCount)
{
}
~ThreadPool()
{
Stop();
}
template<class F, class... Args>
auto CommitTask(F&& f, Args&&... args) -> std::future<std::invoke_result_t<F, Args...>>
{
using ReturnType = std::invoke_result_t<F, Args...>;
std::packaged_task<ReturnType()> packagedTask([f = std::forward<F>(f), args = std::make_tuple(std::forward<Args>(args)...)]() mutable {
return std::apply(std::move(f), std::move(args));
});
std::future<ReturnType> taskReturn = packagedTask.get_future();
{
std::unique_lock<std::mutex> lock(m_task_mutex);
m_tasks.emplace([task = std::move(packagedTask)]() mutable {
task();
});
m_task_count++;
}
m_task_cv.notify_one();
return taskReturn;
}
void Start()
{
std::lock_guard<std::mutex> lifecycleLock(m_lifecycle_mutex);
if(m_threads.empty())
{
m_stop = false;
for(unsigned int i = 0; i < m_thread_count; ++i)
{
std::string threadName = "WorkThread [" + std::to_string(i) + "]";
std::thread thread([this, threadName = std::move(threadName)]() {
pthread_setname_np(pthread_self(), threadName.c_str());
while(true)
{
Task task;
{
std::unique_lock<std::mutex> lock(m_task_mutex);
m_waiting_thread_count++;
m_task_cv.wait(lock, [this]() {
return m_stop || (!m_pause && !m_tasks.empty());
});
m_waiting_thread_count--;
if(m_stop && m_tasks.empty())
{
break;
}
if(!m_tasks.empty())
{
task = std::move(m_tasks.front());
m_tasks.pop();
m_task_count--;
}
}
if(task.valid())
{
m_running_thread_count++;
task();
m_running_thread_count--;
}
}
});
m_threads.emplace_back(std::move(thread));
}
}
}
void Stop()
{
std::lock_guard<std::mutex> lifecycleLock(m_lifecycle_mutex);
if(!m_threads.empty())
{
{
std::lock_guard<std::mutex> lock(m_task_mutex);
m_stop = true;
m_pause = false;
}
m_task_cv.notify_all();
for(auto&& t : m_threads)
{
if(t.joinable())
{
t.join();
}
}
m_threads.clear();
m_running_thread_count = 0;
m_waiting_thread_count = 0;
m_task_count = 0;
}
}
void Pause()
{
std::lock_guard<std::mutex> lifecycleLock(m_lifecycle_mutex);
{
std::lock_guard<std::mutex> lock(m_task_mutex);
m_pause = true;
}
m_task_cv.notify_all();
}
void Resume()
{
std::lock_guard<std::mutex> lifecycleLock(m_lifecycle_mutex);
{
std::lock_guard<std::mutex> lock(m_task_mutex);
m_pause = false;
}
m_task_cv.notify_all();
}
unsigned int GetRunningThreadCount() const
{
return m_running_thread_count.load();
}
unsigned int GetWaitingThreadCount() const
{
return m_waiting_thread_count.load();
}
unsigned int GetTaskCount() const
{
return m_task_count.load();
}
private:
std::vector<std::thread> m_threads;
std::mutex m_lifecycle_mutex;
std::mutex m_task_mutex;
std::condition_variable m_task_cv;
std::queue<Task> m_tasks;
bool m_stop = false;
bool m_pause = false;
unsigned int m_thread_count = 0;
std::atomic<unsigned int> m_running_thread_count = 0;
std::atomic<unsigned int> m_waiting_thread_count = 0;
std::atomic<unsigned int> m_task_count = 0;
};
|