1 files changed, 68 insertions, 0 deletions
diff --git a/cpukit/libfs/src/rfs/rtems-rfs-mutex.c b/cpukit/libfs/src/rfs/rtems-rfs-mutex.c
new file mode 100644
index 0000000000..e67651d269
--- /dev/null
+++ b/cpukit/libfs/src/rfs/rtems-rfs-mutex.c
@@ -0,0 +1,68 @@
+/*
+ *  COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+/**
+ * @file
+ *
+ * @ingroup rtems-rfs
+ *
+ * RTEMS File System Mutex.
+ */
+
+#include <rtems/rfs/rtems-rfs-mutex.h>
+
+#if __rtems__
+/**
+ * RTEMS_RFS Mutex Attributes
+ *
+ * @warning Do not configure as inherit priority. If a driver is in the driver
+ *          initialisation table this locked semaphore will have the IDLE task
+ *          as the holder and a blocking task will raise the priority of the
+ *          IDLE task which can cause unsual side effects like not work.
+ */
+#define RTEMS_RFS_MUTEX_ATTRIBS \
+  (RTEMS_PRIORITY | RTEMS_SIMPLE_BINARY_SEMAPHORE | \
+   RTEMS_NO_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING | RTEMS_LOCAL)
+#endif
+
+int
+rtems_rfs_mutex_create (rtems_rfs_mutex* mutex)
+{
+#if __rtems__
+  rtems_status_code sc;
+  sc = rtems_semaphore_create (rtems_build_name ('R', 'F', 'S', 'm'),
+                               1, RTEMS_RFS_MUTEX_ATTRIBS, 0,
+                               mutex);
+  if (sc != RTEMS_SUCCESSFUL)
+  {
+    if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX))
+      printf ("rtems-rfs: mutex: open failed: %s\n", 
+              rtems_status_text (sc));
+    return EIO;
+  }
+#endif
+  return 0;
+}
+
+int
+rtems_rfs_mutex_destroy (rtems_rfs_mutex* mutex)
+{
+#if __rtems__
+  rtems_status_code sc;
+  sc = rtems_semaphore_delete (*mutex);
+  if (sc != RTEMS_SUCCESSFUL)
+  {
+    if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX))
+      printf ("rtems-rfs: mutex: close failed: %s\n", 
+              rtems_status_text (sc));
+    return EIO;
+  }
+#endif
+  return 0;
+}