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threadpool.cpp
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threadpool.cpp
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#include "infra/threadpool.h"
#include <cassert>
#include <thread>
namespace inf {
class ThreadPool::Task
{
public:
Task(ThreadPool& pool)
: _stop(false)
, _stopFinish(false)
, _pool(pool)
, _thread(&Task::run, this)
{
}
~Task()
{
assert(_thread.joinable());
_thread.join();
}
void stop()
{
_stop = true;
}
void stop_finish_jobs()
{
_stopFinish = true;
}
void run()
{
if (_pool._threadCreateCb) {
_pool._threadCreateCb();
}
for (;;) {
std::unique_lock<std::mutex> lock(_pool._poolMutex);
if (!_pool.has_jobs() || !_stop) {
_pool._condition.wait(lock, [this]() { return _pool.has_jobs() || _stop || _stopFinish; });
}
if (_stop || (_stopFinish && !_pool.has_jobs())) {
break;
}
lock.unlock();
auto job = _pool.get_job();
while (job && !_stop) {
try {
job();
} catch (...) {
_pool.UncaughtException(std::current_exception());
}
job = _pool.get_job();
}
}
if (_pool._threadDestroyCb) {
_pool._threadDestroyCb();
}
}
private:
bool _stop;
bool _stopFinish;
ThreadPool& _pool;
std::thread _thread;
};
ThreadPool::ThreadPool() = default;
ThreadPool::~ThreadPool() = default;
size_t ThreadPool::thread_count() const
{
return _threads.size();
}
void ThreadPool::set_thread_creation_cb(std::function<void()> cb)
{
_threadCreateCb = cb;
}
void ThreadPool::set_thread_destruction_cb(std::function<void()> cb)
{
_threadDestroyCb = cb;
}
void ThreadPool::start(uint32_t numThreads)
{
std::lock_guard<std::mutex> lock(_poolMutex);
if (!_threads.empty()) {
return;
}
for (uint32_t i = 0; i < numThreads; ++i) {
_threads.push_back(std::make_unique<Task>(*this));
}
}
void ThreadPool::stop()
{
{
std::lock_guard<std::mutex> lock(_jobsMutex);
_queuedJobs.clear();
}
{
std::lock_guard<std::mutex> lock(_poolMutex);
for (auto& t : _threads) {
t->stop();
}
_condition.notify_all();
}
// Will cause joining of the threads
_threads.clear();
}
void ThreadPool::stop_finish_jobs()
{
{
std::lock_guard<std::mutex> lock(_poolMutex);
for (auto& t : _threads) {
t->stop_finish_jobs();
}
_condition.notify_all();
}
// Will cause joining of the threads
_threads.clear();
}
bool ThreadPool::has_jobs()
{
std::lock_guard<std::mutex> lock(_jobsMutex);
return !_queuedJobs.empty();
}
void ThreadPool::add_job(std::function<void()> job)
{
{
std::lock_guard<std::mutex> lock(_jobsMutex);
_queuedJobs.push_back(job);
}
{
std::lock_guard<std::mutex> lock(_poolMutex);
_condition.notify_one();
}
}
std::function<void()> ThreadPool::get_job()
{
std::function<void()> job;
{
std::lock_guard<std::mutex> lock(_jobsMutex);
if (!_queuedJobs.empty()) {
job = _queuedJobs.front();
_queuedJobs.pop_front();
}
}
return job;
}
}