Changeset 563 for trunk/kernel/libk/barrier.h

Timestamp:

Oct 4, 2018, 11:16:13 PM (6 years ago)

Author:

alain

Message:

Complete restructuration of kernel spinlocks.

File:

• trunk/kernel/libk/barrier.h (modified) (4 diffs)

trunk/kernel/libk/barrier.h

@@ -1 +1 @@
 /*
- * _barrier.h - local kernel barrier definition
+ * barrier.h - Busy-waiting, local, kernel barrier definition
  * 
- * Author  Alain Greiner (2016)
+ * Author  Alain Greiner (2016,2017,2018)
  *
  * Copyright (c) UPMC Sorbonne Universites
@@ -31 +31 @@
  * This structure defines a "rendez-vous" barrier, that can be used
  * to synchronise several kernel threads running in the same  cluster.
- * It is used in the kernel_init phase.
+ * As it is used in the kernel_init phase, it implements a busy-waiting policy.
  * It does not need to be initialised, but it must be statically allocated 
  * in the KDATA segment to be properly initialised by the compiler/loader.
@@ -40 +40 @@
     uint32_t            current;            // number of arrived threads
     volatile uint32_t   sense;              // barrier state (toggle)
-    uint32_t            pad[(CONFIG_CACHE_LINE_SIZE>>2)-2];
+    uint32_t            padding[(CONFIG_CACHE_LINE_SIZE>>2)-2];
 } 
 barrier_t;
@@ -48 +48 @@
  * expected threads reach the barrier. It can be used several times without
  * specific initialisation. 
- * It is portable, as it uses the remote_lw() & remote_sw() access functions.
+ *****************************************************************************************
  * @ barrier : pointer on barrier
  * @ count   : number of expected thread