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.

---
 c/src/exec/score/src/coresemseize.c | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 c/src/exec/score/src/coresemseize.c

(limited to 'c/src/exec/score/src/coresemseize.c')

diff --git a/c/src/exec/score/src/coresemseize.c b/c/src/exec/score/src/coresemseize.c
new file mode 100644
index 0000000000..f08b40ca5b
--- /dev/null
+++ b/c/src/exec/score/src/coresemseize.c
@@ -0,0 +1,81 @@
+/*
+ *  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_Seize
+ *
+ *  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,
+  boolean                  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 ( !wait ) {
+    _ISR_Enable( level );
+    executing->Wait.return_code = CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT;
+    return;
+  }
+
+  _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 );
+}
-- 
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