MySQL 9.1.0
Source Code Documentation
my_thread_os_id.h
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2
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16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
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20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
23
24/**
25 @file include/my_thread_os_id.h
26 Portable wrapper for gettid().
27*/
28
29#ifndef MY_THREAD_OS_ID_INCLUDED
30#define MY_THREAD_OS_ID_INCLUDED
31
32#include "my_config.h"
33#include "my_macros.h"
34#include "my_thread.h"
35#ifndef _WIN32
36#include <sys/syscall.h>
37#include <unistd.h>
38#endif
39
40#ifdef HAVE_PTHREAD_GETTHREADID_NP
41#include <pthread_np.h> /* pthread_getthreadid_np() */
42#endif /* HAVE_PTHREAD_GETTHREADID_NP */
43
44#ifdef HAVE_PTHREAD_THREADID_NP
45#include <pthread.h>
46#endif /* HAVE_PTHREAD_THREADID_NP */
47
48typedef unsigned long long my_thread_os_id_t;
49
50/**
51 Return the operating system thread id.
52 With Linux, threads have:
53 - an internal id, @c pthread_self(), visible in process
54 - an external id, @c gettid(), visible in the operating system,
55 for example with perf in linux.
56 This helper returns the underling operating system thread id.
57*/
59#ifdef HAVE_PTHREAD_THREADID_NP
60 /*
61 macOS.
62
63 Be careful to use this version first, and to not use SYS_gettid on macOS,
64 as SYS_gettid has a different meaning compared to linux gettid().
65 */
66 uint64_t tid64;
67 pthread_threadid_np(nullptr, &tid64);
68 return (pid_t)tid64;
69#else
70#ifdef HAVE_SYS_GETTID
71 /*
72 Linux.
73 See man gettid
74 See GLIBC Bug 6399 - gettid() should have a wrapper
75 https://sourceware.org/bugzilla/show_bug.cgi?id=6399
76 */
77 return syscall(SYS_gettid);
78#else
79#ifdef _WIN32
80 /* Windows */
81 return GetCurrentThreadId();
82#else
83#ifdef HAVE_PTHREAD_GETTHREADID_NP
84 /* FreeBSD 10.2 */
85 return pthread_getthreadid_np();
86#else
87#ifdef HAVE_INTEGER_PTHREAD_SELF
88 /* Unknown platform, fallback. */
89 return pthread_self();
90#else
91 /* Feature not available. */
92 return 0;
93#endif /* HAVE_INTEGER_PTHREAD_SELF */
94#endif /* HAVE_PTHREAD_GETTHREADID_NP */
95#endif /* _WIN32 */
96#endif /* HAVE_SYS_GETTID */
97#endif /* HAVE_SYS_THREAD_SELFID */
98}
99
100#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:48
static my_thread_os_id_t my_thread_os_id()
Return the operating system thread id.
Definition: my_thread_os_id.h:58