rtems: Add system events

System events are similar to normal events.  They offer a second set of
events.  These events are intended for internal RTEMS use and should not
be used by applications (with the exception of the transient system
event).

1 files changed, 68 insertions, 0 deletions

diff --git a/cpukit/rtems/src/systemeventreceive.c b/cpukit/rtems/src/systemeventreceive.c
new file mode 100644
index 0000000000..43f2bec048
--- /dev/null
+++ b/cpukit/rtems/src/systemeventreceive.c
@@ -0,0 +1,68 @@
+/**
+ * @file
+ *
+ * @ingroup ClassicEventSystem
+ *
+ * @brief rtems_event_system_receive() implementation.
+ */
+
+/*
+ * Copyright (c) 2012 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * 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.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/rtems/event.h>
+#include <rtems/rtems/tasks.h>
+
+rtems_status_code rtems_event_system_receive(
+  rtems_event_set  event_in,
+  rtems_option     option_set,
+  rtems_interval   ticks,
+  rtems_event_set *event_out
+)
+{
+  rtems_status_code sc;
+
+  if ( event_out != NULL ) {
+    Thread_Control    *executing = _Thread_Executing;
+    RTEMS_API_Control *api = executing->API_Extensions[ THREAD_API_RTEMS ];
+    Event_Control     *event = &api->System_event;
+
+    if ( !_Event_sets_Is_empty( event_in ) ) {
+      _Thread_Disable_dispatch();
+      _Event_Seize(
+        event_in,
+        option_set,
+        ticks,
+        event_out,
+        executing,
+        event,
+        &_System_event_Sync_state,
+        STATES_WAITING_FOR_SYSTEM_EVENT
+      );
+      _Thread_Enable_dispatch();
+
+      sc = executing->Wait.return_code;
+    } else {
+      *event_out = event->pending_events;
+      sc = RTEMS_SUCCESSFUL;
+    }
+  } else {
+    sc = RTEMS_INVALID_ADDRESS;
+  }
+
+  return sc;
+}