pthread_self(3) — Linux manual page


PTHREAD_SELF(3)         Linux Programmer's Manual        PTHREAD_SELF(3)

NAME         top

       pthread_self - obtain ID of the calling thread

SYNOPSIS         top

       #include <pthread.h>

       pthread_t pthread_self(void);

       Compile and link with -pthread.

DESCRIPTION         top

       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         top

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

ERRORS         top

       This function always succeeds.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface                             Attribute     Value   │
       │pthread_self()                        │ Thread safety │ MT-Safe │

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at

Linux                          2021-03-22                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)