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workerthread.cpp
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workerthread.cpp
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#include "infra/workerthread.h"
#include <cassert>
#include <thread>
namespace inf {
class WorkerThread::Task
{
public:
Task(WorkerThread& worker, std::function<void()> cb)
: _stop(false)
, _worker(worker)
, _startCb(cb)
, _thread(&Task::run, this)
{
}
~Task()
{
{
std::lock_guard<std::mutex> lock(_mutex);
_stop = true;
_condition.notify_one();
}
if (_thread.joinable()) {
_thread.join();
}
}
void set_stop_cb(std::function<void()> cb)
{
std::lock_guard<std::mutex> lock(_mutex);
_stopCb = cb;
}
void signal_job_available()
{
std::lock_guard<std::mutex> lock(_mutex);
_condition.notify_one();
}
void run()
{
if (_startCb) {
_startCb();
_startCb = nullptr;
}
for (;;) {
std::unique_lock<std::mutex> lock(_mutex);
if (!_worker.has_jobs() || !_stop) {
_condition.wait(lock, [this]() { return _worker.has_jobs() || _stop; });
}
if (!_worker.has_jobs()) {
break;
}
lock.unlock();
auto job = _worker.next_job();
while (job) {
try {
job();
} catch (...) {
_worker.ErrorOccurred(std::current_exception());
}
job = _worker.next_job();
}
}
if (_stopCb) {
_stopCb();
_stopCb = nullptr;
}
}
private:
bool _stop;
WorkerThread& _worker;
std::function<void()> _startCb;
std::function<void()> _stopCb;
std::mutex _mutex;
std::condition_variable _condition;
std::thread _thread;
};
WorkerThread::WorkerThread() = default;
WorkerThread::~WorkerThread() = default;
void WorkerThread::start(std::function<void()> cb)
{
std::lock_guard<std::mutex> lock(_mutex);
if (!_thread) {
_thread = std::make_unique<Task>(*this, cb);
}
}
void WorkerThread::stop(std::function<void()> cb)
{
clear_jobs();
stop_finish_jobs(cb);
}
void WorkerThread::stop_finish_jobs(std::function<void()> cb)
{
if (_thread) {
_thread->set_stop_cb(cb);
_thread.reset();
}
assert(_jobQueue.empty());
}
void WorkerThread::add_job(const std::function<void()>& job)
{
{
std::lock_guard<std::mutex> lock(_mutex);
_jobQueue.push_back(job);
}
if (_thread) {
_thread->signal_job_available();
}
}
void WorkerThread::clear_jobs()
{
std::lock_guard<std::mutex> lock(_mutex);
_jobQueue.clear();
}
bool WorkerThread::has_jobs()
{
std::lock_guard<std::mutex> lock(_mutex);
return !_jobQueue.empty();
}
std::function<void()> WorkerThread::next_job()
{
std::function<void()> job;
std::lock_guard<std::mutex> lock(_mutex);
if (!_jobQueue.empty()) {
job = _jobQueue.front();
_jobQueue.pop_front();
}
return job;
}
}