100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file include/my_thread_os_id.h
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Portable wrapper for gettid().
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*/
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#ifndef MY_THREAD_OS_ID_INCLUDED
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#define MY_THREAD_OS_ID_INCLUDED
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#include "my_config.h"
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#include "my_macros.h"
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#include "my_thread.h"
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#ifndef _WIN32
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#include <sys/syscall.h>
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#include <unistd.h>
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#endif
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#ifdef HAVE_PTHREAD_GETTHREADID_NP
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#include <pthread_np.h> /* pthread_getthreadid_np() */
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#endif /* HAVE_PTHREAD_GETTHREADID_NP */
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#ifdef HAVE_PTHREAD_THREADID_NP
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#include <pthread.h>
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#endif /* HAVE_PTHREAD_THREADID_NP */
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typedef unsigned long long my_thread_os_id_t;
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/**
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Return the operating system thread id.
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With Linux, threads have:
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- an internal id, @c pthread_self(), visible in process
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- an external id, @c gettid(), visible in the operating system,
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for example with perf in linux.
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This helper returns the underling operating system thread id.
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*/
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static inline my_thread_os_id_t my_thread_os_id() {
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#ifdef HAVE_PTHREAD_THREADID_NP
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/*
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macOS.
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Be careful to use this version first, and to not use SYS_gettid on macOS,
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as SYS_gettid has a different meaning compared to linux gettid().
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*/
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uint64_t tid64;
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pthread_threadid_np(nullptr, &tid64);
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return (pid_t)tid64;
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#else
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#ifdef HAVE_SYS_GETTID
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/*
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Linux.
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See man gettid
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See GLIBC Bug 6399 - gettid() should have a wrapper
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https://sourceware.org/bugzilla/show_bug.cgi?id=6399
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*/
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return syscall(SYS_gettid);
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#else
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#ifdef _WIN32
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/* Windows */
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return GetCurrentThreadId();
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#else
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#ifdef HAVE_PTHREAD_GETTHREADID_NP
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/* FreeBSD 10.2 */
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return pthread_getthreadid_np();
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#else
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#ifdef HAVE_INTEGER_PTHREAD_SELF
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/* Unknown platform, fallback. */
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return pthread_self();
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#else
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/* Feature not available. */
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return 0;
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#endif /* HAVE_INTEGER_PTHREAD_SELF */
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#endif /* HAVE_PTHREAD_GETTHREADID_NP */
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#endif /* _WIN32 */
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#endif /* HAVE_SYS_GETTID */
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#endif /* HAVE_SYS_THREAD_SELFID */
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}
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#endif /* MY_THREAD_OS_ID_INCLUDED */
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