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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PTHREAD_SPIN_UNLOCK" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pthread_spin_unlock 
+.SH NAME
+pthread_spin_unlock \- unlock a spin lock object (\fBADVANCED REALTIME
+THREADS\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <pthread.h>
+.br
+.sp
+int pthread_spin_unlock(pthread_spinlock_t *\fP\fIlock\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpthread_spin_unlock\fP() function shall release the spin lock
+referenced by \fIlock\fP which was locked via the \fIpthread_spin_lock\fP()
+or \fIpthread_spin_trylock\fP() functions. The results are undefined
+if the lock is not
+held by the calling thread. If there are threads spinning on the lock
+when \fIpthread_spin_unlock\fP() is called, the lock becomes
+available and an unspecified spinning thread shall acquire the lock.
+.LP
+The results are undefined if this function is called with an uninitialized
+thread spin lock.
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIpthread_spin_unlock\fP() function
+shall return zero; otherwise, an error number shall be
+returned to indicate the error.
+.SH ERRORS
+.LP
+The \fIpthread_spin_unlock\fP() function may fail if:
+.TP 7
+.B EINVAL
+An invalid argument was specified.
+.TP 7
+.B EPERM
+The calling thread does not hold the lock.
+.sp
+.LP
+This function shall not return an error code of [EINTR].
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIpthread_spin_unlock\fP() function is part of the Spin Locks
+option and need not be provided on all implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIpthread_spin_destroy\fP() , \fIpthread_spin_lock\fP() , the Base
+Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<pthread.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .