113 lines
4.5 KiB
C
113 lines
4.5 KiB
C
/*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 */
|