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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).