1 files changed, 108 insertions, 0 deletions
diff --git a/cpukit/libfs/src/rfs/rtems-rfs-mutex.h b/cpukit/libfs/src/rfs/rtems-rfs-mutex.h
new file mode 100644
index 0000000000..12e7fee921
--- /dev/null
+++ b/cpukit/libfs/src/rfs/rtems-rfs-mutex.h
@@ -0,0 +1,108 @@
+/*
+ *  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.
+ *
+ * It may be suprising we abstract this for the RTEMS file system but this code
+ * is designed to be run on host operating systems.
+ */
+
+#if !defined (_RTEMS_RFS_MUTEX_H_)
+#define _RTEMS_RFS_MUTEX_H_
+
+#include <errno.h>
+
+#include <rtems/rfs/rtems-rfs-trace.h>
+
+#if __rtems__
+#include <rtems.h>
+#include <rtems/error.h>
+#endif
+
+/**
+ * RFS Mutex type.
+ */
+#if __rtems__
+typedef rtems_id rtems_rfs_mutex;
+#else
+typedef uint32_t rtems_rfs_mutex; /* place holder */
+#endif
+
+/**
+ * Create the mutex.
+ *
+ * @param mutex Reference to the mutex handle returned to the caller.
+ * @return int The error number (errno). No error if 0.
+ */
+int rtems_rfs_mutex_create (rtems_rfs_mutex* mutex);
+
+/**
+ * Create the mutex.
+ *
+ * @param mutex Reference to the mutex handle returned to the caller.
+ * @return int The error number (errno). No error if 0.
+ */
+int rtems_rfs_mutex_destroy (rtems_rfs_mutex* mutex);
+
+/**
+ * Lock the mutex.
+ *
+ * @param mutex The mutex to lock.
+ * @retval true The mutex is locked.
+ * @retval false The mutex could not be locked.
+ */
+static inline int
+rtems_rfs_mutex_lock (rtems_rfs_mutex* mutex)
+{
+#if __rtems__
+  rtems_status_code sc = rtems_semaphore_obtain (*mutex, RTEMS_WAIT, 0);
+  if (sc != RTEMS_SUCCESSFUL)
+  {
+#if RTEMS_RFS_TRACE
+    if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX))
+      printf ("rtems-rfs: mutex: obtain failed: %s\n", 
+              rtems_status_text (sc));
+#endif
+    return EIO;
+  }
+#endif
+  return 0;
+}
+
+/**
+ * Unlock the mutex.
+ *
+ * @param mutex The mutex to unlock.
+ * @retval true The mutex is unlocked.
+ * @retval false The mutex could not be unlocked.
+ */
+static inline int
+rtems_rfs_mutex_unlock (rtems_rfs_mutex* mutex)
+{
+#if __rtems__
+  rtems_status_code sc = rtems_semaphore_release (*mutex);
+  if (sc != RTEMS_SUCCESSFUL)
+  {
+#if RTEMS_RFS_TRACE
+    if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX))
+      printf ("rtems-rfs: mutex: release failed: %s\n", 
+              rtems_status_text (sc));
+#endif
+    return EIO;
+  }
+#endif
+  return 0;
+}
+
+#endif