1 files changed, 109 insertions, 0 deletions
diff --git a/cpukit/rtems/src/regiongetsegment.c b/cpukit/rtems/src/regiongetsegment.c
new file mode 100644
index 0000000000..68d05fbc12
--- /dev/null
+++ b/cpukit/rtems/src/regiongetsegment.c
@@ -0,0 +1,109 @@
+/*
+ *  Region Manager
+ *
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#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>
+
+/*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(
+  Objects_Id         id,
+  unsigned32         size,
+  rtems_option       option_set,
+  rtems_interval     timeout,
+  void              **segment
+)
+{
+  register Region_Control *the_region;
+  Objects_Locations        location;
+  Thread_Control          *executing;
+  void                    *the_segment;
+
+  *segment = NULL;
+
+  if ( size == 0 )
+    return RTEMS_INVALID_SIZE;
+
+  executing  = _Thread_Executing;
+  the_region = _Region_Get( id, &location );
+  switch ( location ) {
+    case OBJECTS_REMOTE:        /* this error cannot be returned */
+      return RTEMS_INTERNAL_ERROR;
+
+    case OBJECTS_ERROR:
+      return RTEMS_INVALID_ID;
+
+    case OBJECTS_LOCAL:
+      if ( size > the_region->maximum_segment_size ) {
+        _Thread_Enable_dispatch();
+        return RTEMS_INVALID_SIZE;
+      }
+
+      _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;
+        _Thread_Enable_dispatch();
+        *segment = the_segment;
+        return RTEMS_SUCCESSFUL;
+      }
+
+      if ( _Options_Is_no_wait( option_set ) ) {
+        _Thread_Enable_dispatch();
+        return RTEMS_UNSATISFIED;
+      }
+
+      executing->Wait.queue           = &the_region->Wait_queue;
+      executing->Wait.id              = id;
+      executing->Wait.count           = size;
+      executing->Wait.return_argument = (unsigned32 *) 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;
+  }
+
+  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
+}