From c06d8f64671da8f2a1afeb8b3313f064e7257de3 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Mon, 17 May 1999 22:58:30 +0000
Subject: Split the Semaphore Manager into one routine per file.

---
 cpukit/rtems/src/semobtain.c | 120 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 cpukit/rtems/src/semobtain.c

(limited to 'cpukit/rtems/src/semobtain.c')

diff --git a/cpukit/rtems/src/semobtain.c b/cpukit/rtems/src/semobtain.c
new file mode 100644
index 0000000000..c73d84a6da
--- /dev/null
+++ b/cpukit/rtems/src/semobtain.c
@@ -0,0 +1,120 @@
+/*
+ *  Semaphore Manager
+ *
+ *  DESCRIPTION:
+ *
+ *  This package is the implementation of the Semaphore Manager.
+ *  This manager utilizes standard Dijkstra counting semaphores to provide
+ *  synchronization and mutual exclusion capabilities.
+ *
+ *  Directives provided are:
+ *
+ *     + create a semaphore
+ *     + get an ID of a semaphore
+ *     + delete a semaphore
+ *     + acquire a semaphore
+ *     + release a semaphore
+ *
+ *  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_obtain
+ *
+ *  This directive allows a thread to acquire a semaphore.
+ *
+ *  Input parameters:
+ *    id         - semaphore id
+ *    option_set - wait option
+ *    timeout    - number of ticks to wait (0 means wait forever)
+ *
+ *  Output parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code        - if unsuccessful
+ */
+
+rtems_status_code rtems_semaphore_obtain(
+  Objects_Id      id,
+  unsigned32      option_set,
+  rtems_interval  timeout
+)
+{
+  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)
+      return _Semaphore_MP_Send_request_packet(
+          SEMAPHORE_MP_OBTAIN_REQUEST,
+          id,
+          option_set,
+          timeout
+      );
+#endif
+
+    case OBJECTS_ERROR:
+      return RTEMS_INVALID_ID;
+
+    case OBJECTS_LOCAL:
+      if ( _Options_Is_no_wait( option_set ) )
+        wait = FALSE;
+      else
+        wait = TRUE;
+
+      if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set ) ) {
+        _CORE_mutex_Seize(
+          &the_semaphore->Core_control.mutex,
+          id, 
+          wait,
+          timeout
+        );
+        _Thread_Enable_dispatch();
+        return _Semaphore_Translate_core_mutex_return_code( 
+                  _Thread_Executing->Wait.return_code );
+      } else {
+        _CORE_semaphore_Seize(
+          &the_semaphore->Core_control.semaphore,
+          id,
+          wait,
+          timeout
+        );
+        _Thread_Enable_dispatch();
+        return _Semaphore_Translate_core_semaphore_return_code( 
+                  _Thread_Executing->Wait.return_code );
+      }
+  }
+
+  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
+}
-- 
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