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