pthread_self(3) — Linux manual page

pthread_self(3)         Library Functions Manual         pthread_self(3)

NAME

       pthread_self - obtain ID of the calling thread

LIBRARY

       POSIX threads library (libpthread, -lpthread)

SYNOPSIS

       #include <pthread.h>

       pthread_t pthread_self(void);

DESCRIPTION

       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.

RETURN VALUE

       This function always succeeds, returning the calling thread's ID.

ERRORS

       This function always succeeds.

ATTRIBUTES

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ pthread_self()                      │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

NOTES

       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).

SEE ALSO

       pthread_create(3), pthread_equal(3), pthreads(7)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                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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