From: Shaohua Li <shli@kernel.org>
To: linux-raid@vger.kernel.org
Cc: neilb@suse.de, djbw@fb.com
Subject: [patch 2/3] wait: add wait_event_cmd()
Date: Mon, 12 Aug 2013 10:24:36 +0800 [thread overview]
Message-ID: <20130812022539.777546644@kernel.org> (raw)
In-Reply-To: 20130812022434.507702228@kernel.org
[-- Attachment #1: wait-add-new-function.patch --]
[-- Type: text/plain, Size: 1789 bytes --]
Add a new API wait_event_cmd(). It's a variant of wait_even() with two commands
executed. One is executed before sleep, another after sleep.
Signed-off-by: Shaohua Li <shli@fusionio.com>
---
include/linux/wait.h | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
Index: linux/include/linux/wait.h
===================================================================
--- linux.orig/include/linux/wait.h 2013-08-12 09:13:45.972639924 +0800
+++ linux/include/linux/wait.h 2013-08-12 10:02:20.031998428 +0800
@@ -253,6 +253,42 @@ do { \
__ret; \
})
+#define __wait_event_cmd(wq, condition, cmd1, cmd2) \
+do { \
+ DEFINE_WAIT(__wait); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
+ if (condition) \
+ break; \
+ cmd1; \
+ schedule(); \
+ cmd2; \
+ } \
+ finish_wait(&wq, &__wait); \
+} while (0)
+
+/**
+ * wait_event_cmd - sleep until a condition gets true
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * cmd1: the command will be executed before sleep
+ * cmd2: the command will be executed after sleep
+ *
+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
+ * @condition evaluates to true. The @condition is checked each time
+ * the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ */
+#define wait_event_cmd(wq, condition, cmd1, cmd2) \
+do { \
+ if (condition) \
+ break; \
+ __wait_event_cmd(wq, condition, cmd1, cmd2); \
+} while (0)
+
#define __wait_event_interruptible(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
next prev parent reply other threads:[~2013-08-12 2:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-12 2:24 [patch 0/3] raid5: relieve lock contention of get_active_stripe() Shaohua Li
2013-08-12 2:24 ` [patch 1/3] raid5: rename stripe_hash() Shaohua Li
2013-08-12 2:24 ` Shaohua Li [this message]
2013-08-12 2:24 ` [patch 3/3] raid5: relieve lock contention in get_active_stripe() Shaohua Li
2013-08-27 3:17 ` NeilBrown
2013-08-27 8:53 ` Shaohua Li
2013-08-28 4:32 ` NeilBrown
2013-08-28 6:39 ` Shaohua Li
2013-09-03 6:08 ` NeilBrown
2013-09-03 7:02 ` Shaohua Li
2013-09-04 6:41 ` NeilBrown
2013-09-05 5:40 ` Shaohua Li
2013-09-05 6:29 ` NeilBrown
2013-09-05 9:18 ` Shaohua Li
2013-09-09 4:33 ` Shaohua Li
2013-09-10 1:13 ` NeilBrown
2013-09-10 2:35 ` Shaohua Li
2013-09-10 4:06 ` NeilBrown
2013-09-10 4:24 ` Shaohua Li
2013-09-10 5:20 ` NeilBrown
2013-09-10 6:59 ` Shaohua Li
2013-09-10 7:28 ` NeilBrown
2013-09-10 7:37 ` Shaohua Li
2013-09-11 1:34 ` NeilBrown
2013-09-12 1:55 ` Shaohua Li
2013-09-12 5:38 ` NeilBrown
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