1 files changed, 109 insertions, 0 deletions
diff --git a/cpukit/rtems/src/regionresizesegment.c b/cpukit/rtems/src/regionresizesegment.c
new file mode 100644
index 0000000000..737e31436e
--- /dev/null
+++ b/cpukit/rtems/src/regionresizesegment.c
@@ -0,0 +1,109 @@
+/*
+ *  Region Manager
+ *
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  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.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/rtems/status.h>
+#include <rtems/rtems/support.h>
+#include <rtems/score/object.h>
+#include <rtems/rtems/options.h>
+#include <rtems/rtems/region.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/apimutex.h>
+
+/*PAGE
+ *
+ *  rtems_region_resize_segment
+ *
+ *  This directive will try to resize segment to the new size 'size'
+ *  "in place".
+ *
+ *  Input parameters:
+ *    id      - region id
+ *    segment - pointer to segment address
+ *    size    - new required size
+ *
+ *  Output parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code       - if unsuccessful
+ */
+
+rtems_status_code rtems_region_resize_segment(
+  rtems_id    id,
+  void       *segment,
+  uintptr_t   size,
+  uintptr_t  *old_size
+)
+{
+  uintptr_t                avail_size;
+  Objects_Locations        location;
+  uintptr_t                osize;
+  rtems_status_code        return_status;
+  Heap_Resize_status       status;
+  register Region_Control *the_region;
+
+  if ( !old_size )
+    return RTEMS_INVALID_ADDRESS;
+
+  _RTEMS_Lock_allocator();
+
+    the_region = _Region_Get( id, &location );
+    switch ( location ) {
+
+      case OBJECTS_LOCAL:
+
+        _Region_Debug_Walk( the_region, 7 );
+
+        status = _Heap_Resize_block(
+          &the_region->Memory,
+          segment,
+          (uint32_t) size,
+          &osize,
+          &avail_size
+        );
+        *old_size = (uint32_t) osize;
+
+        _Region_Debug_Walk( the_region, 8 );
+
+        if ( status == HEAP_RESIZE_SUCCESSFUL )
+          _Region_Process_queue( the_region );    /* unlocks allocator */
+        else
+          _RTEMS_Unlock_allocator();
+
+
+        if (status == HEAP_RESIZE_SUCCESSFUL)
+          return RTEMS_SUCCESSFUL;
+        if (status == HEAP_RESIZE_UNSATISFIED)
+          return RTEMS_UNSATISFIED;
+        return RTEMS_INVALID_ADDRESS;
+        break;
+
+#if defined(RTEMS_MULTIPROCESSING)
+      case OBJECTS_REMOTE:        /* this error cannot be returned */
+        break;
+#endif
+
+      case OBJECTS_ERROR:
+      default:
+        return_status = RTEMS_INVALID_ID;
+        break;
+    }
+
+  _RTEMS_Unlock_allocator();
+  return return_status;
+}