Robust mutexes merged from devel branchpost_merge_with_ROBUST_MUTEXES

1 files changed, 113 insertions, 0 deletions

diff --git a/pthread_mutexattr_getrobust.c b/pthread_mutexattr_getrobust.c
new file mode 100755
index 0000000..be00483
--- /dev/null
+++ b/pthread_mutexattr_getrobust.c
@@ -0,0 +1,113 @@
+/*
+ * 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 */