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.br pthread_spin_unlock ()
on a lock that is not held by the caller results in undefined behavior.
.sh return value
on success, these functions return zero.
on failure, they return an error number.
.sh errors
.br pthread_spin_lock ()
may fail with the following errors:
.tp
.b edeadlock
.\" not detected in glibc
the system detected a deadlock condition.
.pp
.br pthread_spin_trylock ()
fails with the following errors:
.tp
.b ebusy
the spin lock is currently locked by another thread.
.sh versions
these functions first appeared in glibc in version 2.2.
.sh conforming to
posix.1-2001.
.sh notes
applying any of the functions described on this page to
an uninitialized spin lock results in undefined behavior.
.pp
carefully read notes in
.br pthread_spin_init (3).
.sh see also
.ad l
.nh
.\" fixme . .br pthread_mutex_lock (3),
.br pthread_spin_destroy (3),
.br pthread_spin_init (3),
.br pthreads (7)
.sh colophon
this page is part of release 5.13 of the linux
.i 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/.
.so man3/stailq.3
.so man2/process_vm_readv.2
.so man3/ctime.3
.\" copyright (c) 1992 drew eckhardt (drew@cs.colorado.edu), march 28, 1992
.\"
.\" %%%license_start(verbatim)
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\" %%%license_end
.\"
.\" modified by michael haardt <michael@moria.de>
.\" modified 1993-07-24 by rik faith <faith@cs.unc.edu>
.\" modified 1996-10-22 by eric s. raymond <esr@thyrsus.com>
.\" modified 2004-06-23 by michael kerrisk <mtk.manpages@gmail.com>
.\" modified 2005-01-09 by aeb
.\"
.th uselib 2 2021-03-22 "linux" "linux programmer's manual"
.sh name
uselib \- load shared library
.sh synopsis
.nf
.b #include <unistd.h>
.pp
.bi "int uselib(const char *" library );
.fi
.pp
.ir note :
no declaration of this system call is provided in glibc headers; see notes.
.sh description
the system call
.br uselib ()
serves to load
a shared library to be used by the calling process.
it is given a pathname.
the address where to load is found