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#include "worker.h"
#include <algorithm>
#include <iterator>
#include <mutex>
Worker Worker::instance;
Worker::Worker() : todoLen {0}
{
std::generate_n(std::back_inserter(threads), std::thread::hardware_concurrency(), [this]() {
return std::jthread {&Worker::worker, this};
});
}
Worker::~Worker()
{
todoLen.release(std::thread::hardware_concurrency());
}
void
Worker::addWorkPtr(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();
}
}
void
Worker::assist()
{
auto job = [this]() {
using namespace std::chrono_literals;
if (todoLen.try_acquire_for(100us)) {
if (std::lock_guard<std::mutex> lck {todoMutex}; todo.size()) {
WorkPtr x = std::move(todo.front());
if (x) {
todo.pop_front();
}
return x;
}
}
return WorkPtr {};
};
if (auto j = job()) {
j->doWork();
}
}
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