53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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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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#include "td/utils/port/detail/ThreadIdGuard.h"
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#include "td/utils/logging.h"
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#include "td/utils/port/thread_local.h"
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#include <array>
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#include <mutex>
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namespace td {
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namespace detail {
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class ThreadIdManager {
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public:
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int32 register_thread() {
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std::lock_guard<std::mutex> guard(mutex_);
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for (size_t i = 0; i < is_id_used_.size(); i++) {
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if (!is_id_used_[i]) {
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is_id_used_[i] = true;
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return static_cast<int32>(i + 1);
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}
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}
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LOG(FATAL) << "Cannot create more than " << max_thread_count() << " threads";
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return 0;
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}
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void unregister_thread(int32 thread_id) {
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thread_id--;
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std::lock_guard<std::mutex> guard(mutex_);
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CHECK(is_id_used_.at(thread_id));
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is_id_used_[thread_id] = false;
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}
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private:
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std::mutex mutex_;
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std::array<bool, max_thread_count()> is_id_used_{{false}};
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};
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static ThreadIdManager thread_id_manager;
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ThreadIdGuard::ThreadIdGuard() {
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thread_id_ = thread_id_manager.register_thread();
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set_thread_id(thread_id_);
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}
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ThreadIdGuard::~ThreadIdGuard() {
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thread_id_manager.unregister_thread(thread_id_);
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set_thread_id(0);
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}
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} // namespace detail
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} // namespace td
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