Added rtems_semaphore_flush directive.

c/src/exec/rtems/include/rtems/rtems/sem.h

@@ -161,6 +161,17 @@ rtems_status_code rtems_semaphore_release(
   rtems_id   id
 );
 
+/*
+ *  rtems_semaphore_flush
+ *
+ *  This directive allows a thread to flush the threads
+ *  pending on the semaphore.
+ */
+
+rtems_status_code rtems_semaphore_flush(
+  Objects_Id      id
+);
+
 /*
  *  _Semaphore_Seize
  *

c/src/exec/rtems/src/Makefile.in

@@ -41,7 +41,7 @@ MESSAGE_QUEUE_C_PIECES = msg msgqallocate msgqbroadcast msgqcreate \
     msgqsubmit msgqtranslatereturncode msgqurgent
 
 SEMAPHORE_C_PIECES = sem semcreate semdelete semident semobtain semrelease \
-    semtranslatereturncode
+    semflush semtranslatereturncode
 
 EVENT_C_PIECES = event eventreceive eventseize eventsend eventsurrender \
     eventtimeout

c/src/exec/rtems/src/semflush.c

@@ -0,0 +1,93 @@
+/*
+ *  rtems_semaphore_flush
+ *
+ *  DESCRIPTION:
+ *
+ *  This package is the implementation of the flush directive
+ *  of the Semaphore 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/rtems/attr.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/object.h>
+#include <rtems/rtems/options.h>
+#include <rtems/rtems/sem.h>
+#include <rtems/score/coremutex.h>
+#include <rtems/score/coresem.h>
+#include <rtems/score/states.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#if defined(RTEMS_MULTIPROCESSING)
+#include <rtems/score/mpci.h>
+#endif
+#include <rtems/score/sysstate.h>
+
+#include <rtems/score/interr.h>
+
+/*PAGE
+ *
+ *  rtems_semaphore_flush
+ *
+ *  This directive allows a thread to flush the threads
+ *  pending on the semaphore.
+ *
+ *  Input parameters:
+ *    id         - semaphore id
+ *
+ *  Output parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code        - if unsuccessful
+ */
+
+rtems_status_code rtems_semaphore_flush(
+  Objects_Id      id
+)
+{
+  register Semaphore_Control *the_semaphore;
+  Objects_Locations           location;
+  boolean                     wait;
+
+  the_semaphore = _Semaphore_Get( id, &location );
+  switch ( location ) {
+
+    case OBJECTS_REMOTE:
+#if defined(RTEMS_MULTIPROCESSING)
+      _Thread_Dispatch();
+      return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
+#endif
+
+    case OBJECTS_ERROR:
+      return RTEMS_INVALID_ID;
+
+    case OBJECTS_LOCAL:
+      if ( _Attributes_Is_binary_semaphore(the_semaphore->attribute_set) ) { 
+        _CORE_mutex_Flush(
+          &the_semaphore->Core_control.mutex, 
+          NULL,
+          CORE_MUTEX_STATUS_UNSATISFIED_NOWAIT
+        );
+      } else {
+        _CORE_semaphore_Flush(
+          &the_semaphore->Core_control.semaphore, 
+          NULL,
+          CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT
+        );
+      }
+      return RTEMS_SUCCESSFUL;
+  }
+
+  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
+}