From 7cc8d6c3b1a207684892d207055ceff9f37d5731 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 2 Nov 1999 21:48:15 +0000
Subject: Split core mutex and semaphore handlers into separate files.

---
 cpukit/score/src/coresemsurrender.c | 75 +++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 cpukit/score/src/coresemsurrender.c

(limited to 'cpukit/score/src/coresemsurrender.c')

diff --git a/cpukit/score/src/coresemsurrender.c b/cpukit/score/src/coresemsurrender.c
new file mode 100644
index 0000000000..dd4839182c
--- /dev/null
+++ b/cpukit/score/src/coresemsurrender.c
@@ -0,0 +1,75 @@
+/*
+ *  CORE Semaphore Handler
+ *
+ *  DESCRIPTION:
+ *
+ *  This package is the implementation of the CORE Semaphore Handler.
+ *  This core object utilizes standard Dijkstra counting semaphores to provide
+ *  synchronization and mutual exclusion capabilities.
+ *
+ *  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/score/isr.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
+
+/*PAGE
+ *
+ *  _CORE_semaphore_Surrender
+ *
+ *  Input parameters:
+ *    the_semaphore            - the semaphore to be flushed
+ *    id                       - id of parent semaphore
+ *    api_semaphore_mp_support - api dependent MP support actions
+ *
+ *  Output parameters:
+ *    CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful
+ *    core error code                  - if unsuccessful
+ *
+ *  Output parameters:
+ */
+
+CORE_semaphore_Status _CORE_semaphore_Surrender(
+  CORE_semaphore_Control                *the_semaphore,
+  Objects_Id                             id,
+  CORE_semaphore_API_mp_support_callout  api_semaphore_mp_support
+)
+{
+  Thread_Control *the_thread;
+  ISR_Level       level;
+  CORE_semaphore_Status status;
+
+  status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
+
+  if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) {
+
+    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
+      (*api_semaphore_mp_support) ( the_thread, id );
+
+  } else {
+    _ISR_Disable( level );
+      if ( the_semaphore->count <= the_semaphore->Attributes.maximum_count )
+        the_semaphore->count += 1;
+      else
+        status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
+    _ISR_Enable( level );
+  }
+
+  return status;
+}
+
-- 
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