1 files changed, 131 insertions, 0 deletions
diff --git a/cpukit/rtems/src/regiongetsegment.c b/cpukit/rtems/src/regiongetsegment.c
new file mode 100644
index 0000000000..c8c8cfa0fb
--- /dev/null
+++ b/cpukit/rtems/src/regiongetsegment.c
@@ -0,0 +1,131 @@
+/*
+ *  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_get_segment
+ *
+ *  This directive will obtain a segment from the given region.
+ *
+ *  Input parameters:
+ *    id         - region id
+ *    size       - segment size in bytes
+ *    option_set - wait option
+ *    timeout    - number of ticks to wait (0 means wait forever)
+ *    segment    - pointer to segment address
+ *
+ *  Output parameters:
+ *    segment    - pointer to segment address filled in
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code - if unsuccessful
+ */
+
+rtems_status_code rtems_region_get_segment(
+  rtems_id           id,
+  uintptr_t          size,
+  rtems_option       option_set,
+  rtems_interval     timeout,
+  void              **segment
+)
+{
+  Thread_Control     *executing;
+  Objects_Locations   location;
+  rtems_status_code   return_status;
+  Region_Control     *the_region;
+  void               *the_segment;
+
+  if ( !segment )
+    return RTEMS_INVALID_ADDRESS;
+
+  *segment = NULL;
+
+  if ( size == 0 )
+    return RTEMS_INVALID_SIZE;
+
+  _RTEMS_Lock_allocator();
+
+    executing  = _Thread_Executing;
+    the_region = _Region_Get( id, &location );
+    switch ( location ) {
+
+      case OBJECTS_LOCAL:
+        if ( size > the_region->maximum_segment_size )
+          return_status = RTEMS_INVALID_SIZE;
+
+        else {
+          _Region_Debug_Walk( the_region, 1 );
+
+          the_segment = _Region_Allocate_segment( the_region, size );
+
+          _Region_Debug_Walk( the_region, 2 );
+
+          if ( the_segment ) {
+            the_region->number_of_used_blocks += 1;
+            *segment = the_segment;
+            return_status = RTEMS_SUCCESSFUL;
+          } else if ( _Options_Is_no_wait( option_set ) ) {
+            return_status = RTEMS_UNSATISFIED;
+          } else {
+            /*
+             *  Switch from using the memory allocation mutex to using a
+             *  dispatching disabled critical section.  We have to do this
+             *  because this thread is going to block.
+             */
+            _Thread_Disable_dispatch();
+            _RTEMS_Unlock_allocator();
+
+            executing->Wait.queue           = &the_region->Wait_queue;
+            executing->Wait.id              = id;
+            executing->Wait.count           = size;
+            executing->Wait.return_argument = segment;
+
+            _Thread_queue_Enter_critical_section( &the_region->Wait_queue );
+
+            _Thread_queue_Enqueue( &the_region->Wait_queue, timeout );
+
+            _Thread_Enable_dispatch();
+
+            return (rtems_status_code) executing->Wait.return_code;
+          }
+        }
+        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;
+}