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Diffstat (limited to 'cpukit/rtems/include/rtems/rtems/barrier.h')
-rw-r--r--cpukit/rtems/include/rtems/rtems/barrier.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/cpukit/rtems/include/rtems/rtems/barrier.h b/cpukit/rtems/include/rtems/rtems/barrier.h
index 95264aba31..c2a855666d 100644
--- a/cpukit/rtems/include/rtems/rtems/barrier.h
+++ b/cpukit/rtems/include/rtems/rtems/barrier.h
@@ -13,7 +13,7 @@
* - signal a barrier
*/
-/* COPYRIGHT (c) 1989-2007.
+/* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
@@ -33,6 +33,12 @@
*/
/**@{*/
+/**
+ * This constant is defined to extern most of the time when using
+ * this header file. However by defining it to nothing, the data
+ * declared in this header file can be instantiated. This is done
+ * in a single per manager file.
+ */
#ifndef RTEMS_BARRIER_EXTERN
#define RTEMS_BARRIER_EXTERN extern
#endif