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PTHREAD_SPIN_UNLOCK(3P)    POSIX Programmer's Manual   PTHREAD_SPIN_UNLOCK(3P)
PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       pthread_spin_unlock -- unlock a spin lock object
SYNOPSIS
       #include <pthread.h>
       int pthread_spin_unlock(pthread_spinlock_t *lock);
DESCRIPTION
       The pthread_spin_unlock() function shall release the spin  lock  refer-
       enced   by  lock  which  was  locked  via  the  pthread_spin_lock()  or
       pthread_spin_trylock() functions.
       The results are undefined if the  lock  is  not  held  by  the  calling
       thread.
       If there are threads spinning on the lock when pthread_spin_unlock() is
       called, the lock becomes available and an unspecified  spinning  thread
       shall acquire the lock.
       The results are undefined if this function is called with an uninitial-
       ized thread spin lock.
RETURN VALUE
       Upon successful completion, the  pthread_spin_unlock()  function  shall
       return  zero;  otherwise, an error number shall be returned to indicate
       the error.
ERRORS
       This function shall not return an error code of [EINTR].
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       If an implementation detects that the value specified by the lock argu-
       ment  to  pthread_spin_unlock()  does  not refer to an initialized spin
       lock object, it is recommended that the function should fail and report
       an [EINVAL] error.
       If an implementation detects that the value specified by the lock argu-
       ment to pthread_spin_unlock() refers to a spin lock  object  for  which
       the  current  thread does not hold the lock, it is recommended that the
       function should fail and report an [EPERM] error.
FUTURE DIRECTIONS
       None.
SEE ALSO
       pthread_spin_destroy(), pthread_spin_lock()
       The Base Definitions volume of POSIX.1-2008, Section 4.11, Memory  Syn-
       chronization, <pthread.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013              PTHREAD_SPIN_UNLOCK(3P)