mirror of https://github.com/mkerrisk/man-pages
65 lines
2.1 KiB
Groff
65 lines
2.1 KiB
Groff
.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH PTHREAD_EQUAL 3 2014-05-23 "Linux" "Linux Programmer's Manual"
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.SH NAME
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pthread_equal \- compare thread IDs
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.SH SYNOPSIS
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.nf
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.B #include <pthread.h>
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.BI "int pthread_equal(pthread_t " t1 ", pthread_t " t2 );
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.sp
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Compile and link with \fI\-pthread\fP.
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.fi
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.SH DESCRIPTION
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The
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.BR pthread_equal ()
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function compares two thread identifiers.
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.SH RETURN VALUE
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If the two thread IDs are equal,
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.BR pthread_equal ()
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returns a nonzero value; otherwise, it returns 0.
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.SH ERRORS
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This function always succeeds.
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR pthread_equal ()
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function is thread-safe.
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.SH CONFORMING TO
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POSIX.1-2001.
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.SH NOTES
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The
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.BR pthread_equal ()
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function is necessary because thread IDs should be considered opaque:
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there is no portable way for applications to directly compare two
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.I pthread_t
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values.
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.SH SEE ALSO
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.BR pthread_create (3),
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.BR pthread_self (3),
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.BR pthreads (7)
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