102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
//
|
|
// 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"
|
|
|
|
#include "td/utils/common.h"
|
|
|
|
#include <memory>
|
|
#include <utility>
|
|
|
|
namespace td {
|
|
|
|
// clang-format off
|
|
#if TD_GCC || TD_CLANG
|
|
#define TD_THREAD_LOCAL __thread
|
|
#elif TD_INTEL || TD_MSVC
|
|
#define TD_THREAD_LOCAL thread_local
|
|
#else
|
|
#warning "TD_THREAD_LOCAL is not defined, trying 'thread_local'"
|
|
#define TD_THREAD_LOCAL thread_local
|
|
#endif
|
|
// clang-format on
|
|
|
|
inline constexpr size_t max_thread_count() {
|
|
return 256;
|
|
}
|
|
|
|
// If raw_ptr is not nullptr, allocate T as in std::make_unique<T>(args...) and store pointer into raw_ptr
|
|
template <class T, class P, class... ArgsT>
|
|
bool init_thread_local(P &raw_ptr, ArgsT &&... args);
|
|
|
|
// Destroy all thread locals, and store nullptr into corresponding pointers
|
|
void clear_thread_locals();
|
|
|
|
void set_thread_id(int32 id);
|
|
|
|
int32 get_thread_id();
|
|
|
|
namespace detail {
|
|
|
|
class Destructor {
|
|
public:
|
|
Destructor() = default;
|
|
Destructor(const Destructor &other) = delete;
|
|
Destructor &operator=(const Destructor &other) = delete;
|
|
Destructor(Destructor &&other) = default;
|
|
Destructor &operator=(Destructor &&other) = default;
|
|
virtual ~Destructor() = default;
|
|
};
|
|
|
|
template <class F>
|
|
class LambdaDestructor : public Destructor {
|
|
public:
|
|
explicit LambdaDestructor(F &&f) : f_(std::move(f)) {
|
|
}
|
|
LambdaDestructor(const LambdaDestructor &other) = delete;
|
|
LambdaDestructor &operator=(const LambdaDestructor &other) = delete;
|
|
LambdaDestructor(LambdaDestructor &&other) = default;
|
|
LambdaDestructor &operator=(LambdaDestructor &&other) = default;
|
|
~LambdaDestructor() override {
|
|
f_();
|
|
}
|
|
|
|
private:
|
|
F f_;
|
|
};
|
|
|
|
template <class F>
|
|
std::unique_ptr<Destructor> create_destructor(F &&f) {
|
|
return std::make_unique<LambdaDestructor<F>>(std::forward<F>(f));
|
|
}
|
|
|
|
void add_thread_local_destructor(std::unique_ptr<Destructor> destructor);
|
|
|
|
template <class T, class P, class... ArgsT>
|
|
void do_init_thread_local(P &raw_ptr, ArgsT &&... args) {
|
|
auto ptr = std::make_unique<T>(std::forward<ArgsT>(args)...);
|
|
raw_ptr = ptr.get();
|
|
|
|
detail::add_thread_local_destructor(detail::create_destructor([ptr = std::move(ptr), &raw_ptr]() mutable {
|
|
ptr.reset();
|
|
raw_ptr = nullptr;
|
|
}));
|
|
}
|
|
} // namespace detail
|
|
|
|
template <class T, class P, class... ArgsT>
|
|
bool init_thread_local(P &raw_ptr, ArgsT &&... args) {
|
|
if (likely(raw_ptr != nullptr)) {
|
|
return false;
|
|
}
|
|
detail::do_init_thread_local<T>(raw_ptr, std::forward<ArgsT>(args)...);
|
|
return true;
|
|
}
|
|
|
|
} // namespace td
|