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authorrpj <rpj>2011-05-06 02:11:50 +0000
committerrpj <rpj>2011-05-06 02:11:50 +0000
commit2fe8aba6a8a4ce09f353f34881c77f93a9c01ca3 (patch)
treefd7f179b1abaa525ec55e34bef23b12f8fd89021 /pthread_mutexattr_getrobust.c
parent941d7cf87c60b55342b51e0b0fcd748589b76167 (diff)
Robust mutexes merged from devel branchpost_merge_with_ROBUST_MUTEXES
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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 */