huschi.net

PTHREAD_MUTEX_CONSISTENT(3PPOSIX Programmer's ManuPTHREAD_MUTEX_CONSISTENT(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_mutex_consistent -- mark state protected  by  robust  mutex  as
       consistent
SYNOPSIS
       #include <pthread.h>
       int pthread_mutex_consistent(pthread_mutex_t *mutex);
DESCRIPTION
       If   mutex   is   a   robust   mutex  in  an  inconsistent  state,  the
       pthread_mutex_consistent() function can be used to mark the state  pro-
       tected by the mutex referenced by mutex as consistent again.
       If  an  owner of a robust mutex terminates while holding the mutex, the
       mutex becomes inconsistent and the next thread that acquires the  mutex
       lock  shall  be notified of the state by the return value [EOWNERDEAD].
       In this case, the mutex does not become normally usable again until the
       state is marked consistent.
       If  the  thread  which  acquired  the  mutex lock with the return value
       [EOWNERDEAD] terminates  before  calling  either  pthread_mutex_consis-
       tent()  or  pthread_mutex_unlock(),  the  next thread that acquires the
       mutex lock shall be notified about the state of the mutex by the return
       value [EOWNERDEAD].
       The  behavior is undefined if the value specified by the mutex argument
       to pthread_mutex_consistent() does not refer to an initialized mutex.
RETURN VALUE
       Upon successful  completion,  the  pthread_mutex_consistent()  function
       shall return zero. Otherwise, an error value shall be returned to indi-
       cate the error.
ERRORS
       The pthread_mutex_consistent() function shall fail if:
       EINVAL The mutex object referenced by mutex is not robust or  does  not
              protect an inconsistent state.
       These functions shall not return an error code of [EINTR].
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The pthread_mutex_consistent() function is only responsible for notify-
       ing the implementation that the state protected by the mutex  has  been
       recovered  and that normal operations with the mutex can be resumed. It
       is the responsibility of the application to recover the state so it can
       be  reused.  If the application is not able to perform the recovery, it
       can notify the implementation that the situation is unrecoverable by  a
       call    to    pthread_mutex_unlock()    without   a   prior   call   to
       pthread_mutex_consistent(),  in  which  case  subsequent  threads  that
       attempt to lock the mutex will fail to acquire the lock and be returned
       [ENOTRECOVERABLE].
RATIONALE
       If an implementation detects that the  value  specified  by  the  mutex
       argument to pthread_mutex_consistent() does not refer to an initialized
       mutex, it is recommended that the function should fail  and  report  an
       [EINVAL] error.
FUTURE DIRECTIONS
       None.
SEE ALSO
       pthread_mutex_lock(), pthread_mutexattr_getrobust()
       The Base Definitions volume of POSIX.1-2008, <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_MUTEX_CONSISTENT(3P)