102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2017
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/port/config.h"
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#include "td/utils/common.h"
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#include <memory>
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#include <utility>
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namespace td {
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// clang-format off
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#if TD_GCC || TD_CLANG
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#define TD_THREAD_LOCAL __thread
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#elif TD_INTEL || TD_MSVC
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#define TD_THREAD_LOCAL thread_local
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#else
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#warning "TD_THREAD_LOCAL is not defined, trying 'thread_local'"
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#define TD_THREAD_LOCAL thread_local
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#endif
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// clang-format on
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inline constexpr size_t max_thread_count() {
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return 256;
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}
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// If raw_ptr is not nullptr, allocate T as in std::make_unique<T>(args...) and store pointer into raw_ptr
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template <class T, class P, class... ArgsT>
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bool init_thread_local(P &raw_ptr, ArgsT &&... args);
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// Destroy all thread locals, and store nullptr into corresponding pointers
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void clear_thread_locals();
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void set_thread_id(int32 id);
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int32 get_thread_id();
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namespace detail {
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class Destructor {
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public:
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Destructor() = default;
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Destructor(const Destructor &other) = delete;
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Destructor &operator=(const Destructor &other) = delete;
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Destructor(Destructor &&other) = default;
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Destructor &operator=(Destructor &&other) = default;
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virtual ~Destructor() = default;
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};
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template <class F>
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class LambdaDestructor : public Destructor {
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public:
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explicit LambdaDestructor(F &&f) : f_(std::move(f)) {
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}
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LambdaDestructor(const LambdaDestructor &other) = delete;
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LambdaDestructor &operator=(const LambdaDestructor &other) = delete;
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LambdaDestructor(LambdaDestructor &&other) = default;
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LambdaDestructor &operator=(LambdaDestructor &&other) = default;
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~LambdaDestructor() override {
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f_();
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}
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private:
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F f_;
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};
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template <class F>
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std::unique_ptr<Destructor> create_destructor(F &&f) {
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return std::make_unique<LambdaDestructor<F>>(std::forward<F>(f));
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}
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void add_thread_local_destructor(std::unique_ptr<Destructor> destructor);
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template <class T, class P, class... ArgsT>
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void do_init_thread_local(P &raw_ptr, ArgsT &&... args) {
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auto ptr = std::make_unique<T>(std::forward<ArgsT>(args)...);
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raw_ptr = ptr.get();
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detail::add_thread_local_destructor(detail::create_destructor([ptr = std::move(ptr), &raw_ptr]() mutable {
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ptr.reset();
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raw_ptr = nullptr;
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}));
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}
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} // namespace detail
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template <class T, class P, class... ArgsT>
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bool init_thread_local(P &raw_ptr, ArgsT &&... args) {
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if (likely(raw_ptr != nullptr)) {
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return false;
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}
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detail::do_init_thread_local<T>(raw_ptr, std::forward<ArgsT>(args)...);
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return true;
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}
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} // namespace td
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