bsd man page for pthread_self

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

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_cre-
       ate(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 4.15 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/.

Linux								    2017-09-15							   PTHREAD_SELF(3)