| /* |
| * 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 */ |