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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_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 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)