57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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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/common.h"
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#include "td/utils/ExitGuard.h"
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#include "td/utils/port/thread_local.h"
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#include <mutex>
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#include <set>
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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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if (unused_thread_ids_.empty()) {
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return ++max_thread_id_;
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}
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auto it = unused_thread_ids_.begin();
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auto result = *it;
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unused_thread_ids_.erase(it);
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return result;
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}
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void unregister_thread(int32 thread_id) {
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std::lock_guard<std::mutex> guard(mutex_);
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CHECK(0 < thread_id && thread_id <= max_thread_id_);
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bool is_inserted = unused_thread_ids_.insert(thread_id).second;
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CHECK(is_inserted);
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}
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private:
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std::mutex mutex_;
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std::set<int32> unused_thread_ids_;
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int32 max_thread_id_ = 0;
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};
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static ThreadIdManager thread_id_manager;
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static ExitGuard exit_guard;
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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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if (!ExitGuard::is_exited()) {
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thread_id_manager.unregister_thread(thread_id_);
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}
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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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