82 lines
1.5 KiB
C++
82 lines
1.5 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#ifndef THREAD_ID_HXX
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#define THREAD_ID_HXX
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#ifdef _WIN32
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#include <processthreadsapi.h>
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#else
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#include <pthread.h>
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#endif
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/**
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* A low-level identification for a thread. Designed to work with
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* existing threads, such as the main thread. Mostly useful for
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* debugging code.
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*/
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class ThreadId {
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#ifdef _WIN32
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DWORD id;
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#else
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pthread_t id;
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#endif
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public:
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/**
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* No initialisation.
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*/
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ThreadId() noexcept = default;
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#ifdef _WIN32
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constexpr ThreadId(DWORD _id) noexcept:id(_id) {}
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#else
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constexpr ThreadId(pthread_t _id) noexcept:id(_id) {}
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#endif
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static constexpr ThreadId Null() noexcept {
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#ifdef _WIN32
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return 0;
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#else
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return pthread_t();
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#endif
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}
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[[gnu::pure]]
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bool IsNull() const noexcept {
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return *this == Null();
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}
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/**
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* Return the current thread's id .
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*/
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[[gnu::pure]]
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static const ThreadId GetCurrent() noexcept {
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#ifdef _WIN32
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return ::GetCurrentThreadId();
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#else
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return pthread_self();
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#endif
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}
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[[gnu::pure]]
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bool operator==(const ThreadId &other) const noexcept {
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/* note: not using pthread_equal() because that
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function "is undefined if either thread ID is not
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valid so we can't safely use it on
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default-constructed values" (comment from
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libstdc++) - and if both libstdc++ and libc++ get
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away with this, we can do it as well */
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return id == other.id;
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}
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/**
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* Check if this thread is the current thread.
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*/
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bool IsInside() const noexcept {
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return *this == GetCurrent();
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}
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};
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#endif
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