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+.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
+.\"     <mtk.manpages@gmail.com>
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.TH PTHREAD_SELF 3 2008-10-24 "Linux" "Linux Programmer's Manual"
+.SH NAME
+pthread_self \- obtain ID of the calling thread
+.SH SYNOPSIS
+.nf
+.B #include <pthread.h>
+
+.B pthread_t pthread_self(void);
+.sp
+Compile and link with \fI\-pthread\fP.
+.SH DESCRIPTION
+The
+.BR pthread_self ()
+function returns the ID of the calling thread.
+This is the same value that is returned in
+.IR *thread
+in the
+.BR pthread_create (3)
+call that created this thread.
+.SH RETURN VALUE
+This function always succeeds, returning the calling thread's ID.
+.SH ERRORS
+This function always succeeds.
+.SH CONFORMING TO
+POSIX.1-2001.
+.SH 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
+.I pthread_t
+can't portably be compared using the C equality operator (\fB==\fP);
+use
+.BR pthread_equal (3)
+instead.
+
+Thread identifiers should be considered opaque:
+any attempt to use a thread ID other than in pthreads calls
+is non-portable and can lead to unspecified results.
+
+Thread IDs are only guaranteed to be unique 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
+.BR pthread_self ()
+is not the same thing as the kernel thread ID returned by a call to
+.BR gettid (2).
+.SH SEE ALSO
+.BR pthread_create (3),
+.BR pthread_equal (3),
+.BR pthreads (7)