NAME

       pthread_self - obtain ID of the calling thread

SYNOPSIS

       #include <pthread.h>

       pthread_t pthread_self(void);

       Compile and link with -pthread.

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 │
       └───────────────┴───────────────┴─────────┘

CONFORMING TO

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

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

       This page is part of release 5.10 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 https://www.kernel.org/doc/man-pages/.