---

yaml --- r: 8755 b: refs/heads/master c: 498d0c5 h: refs/heads/master i: 8753: aab3f5d 8751: 8f70608 v: v3
git-mirror · Sep 13, 2005 · ca45170 · ca45170
1 parent a70c45f
commit ca45170
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Showing 2 changed files with 12 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 921717a2a1cde78c9b2aa971c16510d63efe7320
+refs/heads/master: 498d0c5711094b0e1fd93f5355d270ccebdec706
diff --git a/trunk/include/linux/sched.h b/trunk/include/linux/sched.h
@@ -121,6 +121,17 @@ extern unsigned long nr_iowait(void);
 #define set_task_state(tsk, state_value)		\
 	set_mb((tsk)->state, (state_value))
 
+/*
+ * set_current_state() includes a barrier so that the write of current->state
+ * is correctly serialised wrt the caller's subsequent test of whether to
+ * actually sleep:
+ *
+ *	set_current_state(TASK_UNINTERRUPTIBLE);
+ *	if (do_i_need_to_sleep())
+ *		schedule();
+ *
+ * If the caller does not need such serialisation then use __set_current_state()
+ */
 #define __set_current_state(state_value)			\
 	do { current->state = (state_value); } while (0)
 #define set_current_state(state_value)		\