1 files changed, 88 insertions, 0 deletions
diff --git a/cpukit/score/src/coresemseize.c b/cpukit/score/src/coresemseize.c
new file mode 100644
index 0000000000..a66690e148
--- /dev/null
+++ b/cpukit/score/src/coresemseize.c
@@ -0,0 +1,88 @@
+/*
+ *  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) 1989-2008.
+ *  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/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_SCORE_CORESEM_ENABLE_SEIZE_BODY)
+/*
+ *  This routine attempts to allocate a core semaphore to the calling thread.
+ *
+ *  Input parameters:
+ *    the_semaphore - pointer to semaphore control block
+ *    id            - id of object to wait on
+ *    wait          - true if wait is allowed, false otherwise
+ *    timeout       - number of ticks to wait (0 means forever)
+ *
+ *  Output parameters:  NONE
+ *
+ *  INTERRUPT LATENCY:
+ *    available
+ *    wait
+ */
+
+void _CORE_semaphore_Seize(
+  CORE_semaphore_Control *the_semaphore,
+  Objects_Id              id,
+  bool                    wait,
+  Watchdog_Interval       timeout
+)
+{
+  Thread_Control *executing;
+  ISR_Level       level;
+
+  executing = _Thread_Executing;
+  executing->Wait.return_code = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
+  _ISR_Disable( level );
+  if ( the_semaphore->count != 0 ) {
+    the_semaphore->count -= 1;
+    _ISR_Enable( level );
+    return;
+  }
+
+  /*
+   *  If the semaphore was not available and the caller was not willing
+   *  to block, then return immediately with a status indicating that
+   *  the semaphore was not available and the caller never blocked.
+   */
+  if ( !wait ) {
+    _ISR_Enable( level );
+    executing->Wait.return_code = CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT;
+    return;
+  }
+
+  /*
+   *  If the semaphore is not available and the caller is willing to
+   *  block, then we now block the caller with optional timeout.
+   */
+  _Thread_queue_Enter_critical_section( &the_semaphore->Wait_queue );
+  executing->Wait.queue = &the_semaphore->Wait_queue;
+  executing->Wait.id    = id;
+  _ISR_Enable( level );
+  _Thread_queue_Enqueue( &the_semaphore->Wait_queue, timeout );
+}
+#endif