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#include "worker.h"
#if __cpp_lib_semaphore
# include "work.h"
# include <algorithm>
# include <iterator>
# include <mutex>
Worker::Worker() : todoLen {0}
{
std::generate_n(std::back_inserter(threads), std::thread::hardware_concurrency(), [this]() {
return std::thread {&Worker::worker, this};
});
}
Worker::~Worker()
{
todoLen.release(std::thread::hardware_concurrency());
std::for_each(threads.begin(), threads.end(), [](auto & th) {
th.join();
});
}
void
Worker::addWork(WorkPtr j)
{
std::lock_guard<std::mutex> lck {todoMutex};
todoLen.release();
todo.emplace_back(std::move(j));
}
void
Worker::worker()
{
auto job = [this]() {
todoLen.acquire();
std::lock_guard<std::mutex> lck {todoMutex};
if (todo.size()) {
WorkPtr x = std::move(todo.front());
todo.pop_front();
return x;
}
return WorkPtr {};
};
while (auto j = job()) {
j->doWork();
}
}
#endif
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