1 files changed, 118 insertions, 0 deletions
diff --git a/cpukit/rtems/src/semrelease.c b/cpukit/rtems/src/semrelease.c
new file mode 100644
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+++ b/cpukit/rtems/src/semrelease.c
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+/*
+ *  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_release
+ *
+ *  This directive allows a thread to release a semaphore.
+ *
+ *  Input parameters:
+ *    id - semaphore id
+ *
+ *  Output parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code        - if unsuccessful
+ */
+
+rtems_status_code rtems_semaphore_release(
+  Objects_Id id
+)
+{
+  register Semaphore_Control *the_semaphore;
+  Objects_Locations           location;
+  CORE_mutex_Status           mutex_status;
+  CORE_semaphore_Status       semaphore_status;
+
+  the_semaphore = _Semaphore_Get( id, &location );
+  switch ( location ) {
+
+    case OBJECTS_REMOTE:
+#if defined(RTEMS_MULTIPROCESSING)
+      return _Semaphore_MP_Send_request_packet(
+        SEMAPHORE_MP_RELEASE_REQUEST,
+        id,
+        0,                               /* Not used */
+        MPCI_DEFAULT_TIMEOUT
+      );
+#endif
+
+    case OBJECTS_ERROR:
+      return RTEMS_INVALID_ID;
+
+    case OBJECTS_LOCAL:
+      if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set ) ) {
+        mutex_status = _CORE_mutex_Surrender(
+                         &the_semaphore->Core_control.mutex,
+                         id,
+#if defined(RTEMS_MULTIPROCESSING)
+                         _Semaphore_Core_mutex_mp_support
+#else
+                         NULL
+#endif
+                       );
+        _Thread_Enable_dispatch();
+        return _Semaphore_Translate_core_mutex_return_code( mutex_status );
+      }
+      else
+        semaphore_status = _CORE_semaphore_Surrender(
+                             &the_semaphore->Core_control.semaphore,
+                             id,
+#if defined(RTEMS_MULTIPROCESSING)
+                             _Semaphore_Core_semaphore_mp_support
+#else
+                             NULL
+#endif
+                           );
+        _Thread_Enable_dispatch();
+        return
+          _Semaphore_Translate_core_semaphore_return_code( semaphore_status );
+  }
+
+  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
+}