tdlight/tdutils/td/utils/port/detail/ThreadPthread.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/port/config.h"
#ifdef TD_THREAD_PTHREAD
#include "td/utils/common.h"
#include "td/utils/Destructor.h"
#include "td/utils/invoke.h"
#include "td/utils/MovableValue.h"
#include "td/utils/port/detail/ThreadIdGuard.h"
#include "td/utils/port/thread_local.h"
#include <tuple>
#include <type_traits>
#include <utility>
#include <pthread.h>
#include <sched.h>
namespace td {
namespace detail {
class ThreadPthread {
public:
ThreadPthread() = default;
ThreadPthread(const ThreadPthread &other) = delete;
ThreadPthread &operator=(const ThreadPthread &other) = delete;
ThreadPthread(ThreadPthread &&) = default;
ThreadPthread &operator=(ThreadPthread &&other) {
join();
is_inited_ = std::move(other.is_inited_);
thread_ = other.thread_;
}
template <class Function, class... Args>
explicit ThreadPthread(Function &&f, Args &&... args) {
auto func = create_destructor([args = std::make_tuple(decay_copy(std::forward<Function>(f)),
decay_copy(std::forward<Args>(args))...)]() mutable {
invoke_tuple(std::move(args));
clear_thread_locals();
});
pthread_create(&thread_, nullptr, run_thread, func.release());
is_inited_ = true;
}
void join() {
if (is_inited_.get()) {
is_inited_ = false;
pthread_join(thread_, nullptr);
}
}
void detach() {
if (is_inited_.get()) {
is_inited_ = false;
pthread_detach(thread_);
}
}
~ThreadPthread() {
join();
}
static unsigned hardware_concurrency() {
return 8;
}
using id = pthread_t;
private:
MovableValue<bool> is_inited_;
pthread_t thread_;
template <class T>
std::decay_t<T> decay_copy(T &&v) {
return std::forward<T>(v);
}
static void *run_thread(void *ptr) {
ThreadIdGuard thread_id_guard;
auto func = unique_ptr<Destructor>(static_cast<Destructor *>(ptr));
func->reset();
return nullptr;
}
};
namespace this_thread_pthread {
inline void yield() {
sched_yield();
}
inline ThreadPthread::id get_id() {
return pthread_self();
}
} // namespace this_thread_pthread
} // namespace detail
} // namespace td
#endif