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/*
* pthread_mutexattr_getrobust.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
int
pthread_mutexattr_getrobust (const pthread_mutexattr_t * attr, int * robust)
/*
* ------------------------------------------------------
*
* DOCPUBLIC
* The pthread_mutexattr_setrobust() and
* pthread_mutexattr_getrobust() functions respectively set and
* get the mutex robust attribute. This attribute is set in the
* robust parameter to these functions.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_mutexattr_t
*
* robust
* must be one of:
*
* PTHREAD_MUTEX_STALLED
*
* PTHREAD_MUTEX_ROBUST
*
* DESCRIPTION
* The pthread_mutexattr_setrobust() and
* pthread_mutexattr_getrobust() functions respectively set and
* get the mutex robust attribute. This attribute is set in the
* robust parameter to these functions. The default value of the
* robust attribute is PTHREAD_MUTEX_STALLED.
*
* The robustness of mutex is contained in the robustness attribute
* of the mutex attributes. Valid mutex robustness values are:
*
* PTHREAD_MUTEX_STALLED
* No special actions are taken if the owner of the mutex is
* terminated while holding the mutex lock. This can lead to
* deadlocks if no other thread can unlock the mutex.
* This is the default value.
*
* PTHREAD_MUTEX_ROBUST
* If the process containing the owning thread of a robust mutex
* terminates while holding the mutex lock, the next thread that
* acquires the mutex shall be notified about the termination by
* the return value [EOWNERDEAD] from the locking function. If the
* owning thread of a robust mutex terminates while holding the mutex
* lock, the next thread that acquires the mutex may be notified
* about the termination by the return value [EOWNERDEAD]. The
* notified thread can then attempt to mark the state protected by
* the mutex as consistent again by a call to
* pthread_mutex_consistent(). After a subsequent successful call to
* pthread_mutex_unlock(), the mutex lock shall be released and can
* be used normally by other threads. If the mutex is unlocked without
* a call to pthread_mutex_consistent(), it shall be in a permanently
* unusable state and all attempts to lock the mutex shall fail with
* the error [ENOTRECOVERABLE]. The only permissible operation on such
* a mutex is pthread_mutex_destroy().
*
* RESULTS
* 0 successfully set attribute,
* EINVAL 'attr' or 'robust' is invalid,
*
* ------------------------------------------------------
*/
{
int result = EINVAL;
if ((attr != NULL && *attr != NULL && robust != NULL))
{
*robust = (*attr)->robustness;
result = 0;
}
return (result);
} /* pthread_mutexattr_getrobust */
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