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/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_THREAD_ID_HXX
#define MPD_THREAD_ID_HXX
#include "util/Compiler.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <pthread.h>
#endif
/**
* A low-level identification for a thread. Designed to work with
* existing threads, such as the main thread. Mostly useful for
* debugging code.
*/
class ThreadId {
#ifdef _WIN32
DWORD id;
#else
pthread_t id;
#endif
public:
/**
* No initialisation.
*/
ThreadId() noexcept = default;
#ifdef _WIN32
constexpr ThreadId(DWORD _id) noexcept:id(_id) {}
#else
constexpr ThreadId(pthread_t _id) noexcept:id(_id) {}
#endif
static constexpr ThreadId Null() noexcept {
#ifdef _WIN32
return 0;
#else
return pthread_t();
#endif
}
gcc_pure
bool IsNull() const noexcept {
return *this == Null();
}
/**
* Return the current thread's id .
*/
gcc_pure
static const ThreadId GetCurrent() noexcept {
#ifdef _WIN32
return ::GetCurrentThreadId();
#else
return pthread_self();
#endif
}
gcc_pure
bool operator==(const ThreadId &other) const noexcept {
/* note: not using pthread_equal() because that
function "is undefined if either thread ID is not
valid so we can't safely use it on
default-constructed values" (comment from
libstdc++) - and if both libstdc++ and libc++ get
away with this, we can do it as well */
return id == other.id;
}
/**
* Check if this thread is the current thread.
*/
bool IsInside() const noexcept {
return *this == GetCurrent();
}
};
#endif
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