MySQL 8.3.0
Source Code Documentation
my_thread_os_id.h
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1/* Copyright (c) 2015, 2023, Oracle and/or its affiliates.
2
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4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
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12 separately licensed software that they have included with MySQL.
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22
23/**
24 @file include/my_thread_os_id.h
25 Portable wrapper for gettid().
26*/
27
28#ifndef MY_THREAD_OS_ID_INCLUDED
29#define MY_THREAD_OS_ID_INCLUDED
30
31#include "my_config.h"
32#include "my_macros.h"
33#include "my_thread.h"
34#ifndef _WIN32
35#include <sys/syscall.h>
36#include <unistd.h>
37#endif
38
39#ifdef HAVE_PTHREAD_GETTHREADID_NP
40#include <pthread_np.h> /* pthread_getthreadid_np() */
41#endif /* HAVE_PTHREAD_GETTHREADID_NP */
42
43#ifdef HAVE_PTHREAD_THREADID_NP
44#include <pthread.h>
45#endif /* HAVE_PTHREAD_THREADID_NP */
46
47typedef unsigned long long my_thread_os_id_t;
48
49/**
50 Return the operating system thread id.
51 With Linux, threads have:
52 - an internal id, @c pthread_self(), visible in process
53 - an external id, @c gettid(), visible in the operating system,
54 for example with perf in linux.
55 This helper returns the underling operating system thread id.
56*/
58#ifdef HAVE_PTHREAD_THREADID_NP
59 /*
60 macOS.
61
62 Be careful to use this version first, and to not use SYS_gettid on macOS,
63 as SYS_gettid has a different meaning compared to linux gettid().
64 */
65 uint64_t tid64;
66 pthread_threadid_np(nullptr, &tid64);
67 return (pid_t)tid64;
68#else
69#ifdef HAVE_SYS_GETTID
70 /*
71 Linux.
72 See man gettid
73 See GLIBC Bug 6399 - gettid() should have a wrapper
74 https://sourceware.org/bugzilla/show_bug.cgi?id=6399
75 */
76 return syscall(SYS_gettid);
77#else
78#ifdef _WIN32
79 /* Windows */
80 return GetCurrentThreadId();
81#else
82#ifdef HAVE_PTHREAD_GETTHREADID_NP
83 /* FreeBSD 10.2 */
84 return pthread_getthreadid_np();
85#else
86#ifdef HAVE_INTEGER_PTHREAD_SELF
87 /* Unknown platform, fallback. */
88 return pthread_self();
89#else
90 /* Feature not available. */
91 return 0;
92#endif /* HAVE_INTEGER_PTHREAD_SELF */
93#endif /* HAVE_PTHREAD_GETTHREADID_NP */
94#endif /* _WIN32 */
95#endif /* HAVE_SYS_GETTID */
96#endif /* HAVE_SYS_THREAD_SELFID */
97}
98
99#endif /* MY_THREAD_OS_ID_INCLUDED */
Some common macros.
Defines to make different thread packages compatible.
unsigned long long my_thread_os_id_t
Definition: my_thread_os_id.h:47
static my_thread_os_id_t my_thread_os_id()
Return the operating system thread id.
Definition: my_thread_os_id.h:57