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+'\" t
+.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
+.\"     <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH pthread_self 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+pthread_self \- obtain ID of the calling thread
+.SH LIBRARY
+POSIX threads library
+.RI ( libpthread ", " \-lpthread )
+.SH SYNOPSIS
+.nf
+.B #include <pthread.h>
+.PP
+.B pthread_t pthread_self(void);
+.fi
+.SH DESCRIPTION
+The
+.BR pthread_self ()
+function returns the ID of the calling thread.
+This is the same value that is returned in
+.I *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 ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR pthread_self ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+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.
+.PP
+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.
+.PP
+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.
+.PP
+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)