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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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pthread_self(3) Library Functions Manual pthread_self(3)
pthread_self - obtain ID of the calling thread
POSIX threads library (libpthread, -lpthread)
#include <pthread.h>
pthread_t pthread_self(void);
The pthread_self() function returns the ID of the calling thread.
This is the same value that is returned in *thread in the
pthread_create(3) call that created this thread.
This function always succeeds, returning the calling thread's ID.
This function always succeeds.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ pthread_self() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
POSIX.1-2001.
POSIX.1 allows an implementation wide freedom in choosing the type
used to represent a thread ID; for example, representation using
either an arithmetic type or a structure is permitted. Therefore,
variables of type pthread_t can't portably be compared using the C
equality operator (==); use pthread_equal(3) instead.
Thread identifiers should be considered opaque: any attempt to use
a thread ID other than in pthreads calls is nonportable and can
lead to unspecified results.
Thread IDs are guaranteed to be unique only within a process. A
thread ID may be reused after a terminated thread has been joined,
or a detached thread has terminated.
The thread ID returned by pthread_self() is not the same thing as
the kernel thread ID returned by a call to gettid(2).
pthread_create(3), pthread_equal(3), pthreads(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pthread_self(3)
Pages that refer to this page: gettid(2), pthread_create(3), pthread_equal(3), pthread_getcpuclockid(3), pthread_kill(3), pthread_setaffinity_np(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7), signal-safety(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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