linux-kernel - [patch 2/6] epoll keyed wakeups v2 - introduce new *

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Message-ID: <send-serie.davidel@xmailserver.org.13601.1233518664.2>
Date:	Sun, 01 Feb 2009 12:04:23 -0800
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>
Subject: [patch 2/6] epoll keyed wakeups v2 - introduce new *_poll() wakeup macros

This patch introduces new wakeup macros that allow passing an event
mask to the wakeup targets. They exactly mimic their non-_poll()
counterpart, with the added event mask passing capability.
I did add only the ones currently requested, avoiding the _nr() and
_all() for the moment.



Signed-off-by: Davide Libenzi <davidel@...ilserver.org>


- Davide


---
 include/linux/wait.h |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Index: linux-2.6.mod/include/linux/wait.h
===================================================================
--- linux-2.6.mod.orig/include/linux/wait.h	2009-01-31 15:24:50.000000000 -0800
+++ linux-2.6.mod/include/linux/wait.h	2009-01-31 15:33:40.000000000 -0800
@@ -156,6 +156,18 @@ wait_queue_head_t *bit_waitqueue(void *,
 #define wake_up_interruptible_all(x)	__wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
 #define wake_up_interruptible_sync(x)	__wake_up_sync((x), TASK_INTERRUPTIBLE, 1)
 
+/*
+ * Wakeup macros to be used to report events to the targets.
+ */
+#define wake_up_poll(x, m)				\
+	__wake_up(x, TASK_NORMAL, 1, (void *) (m))
+#define wake_up_locked_poll(x, m)				\
+	__wake_up_locked_key((x), TASK_NORMAL, (void *) (m))
+#define wake_up_interruptible_poll(x, m)			\
+	__wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
+#define wake_up_interruptible_sync_poll(x, m)				\
+	__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 /*
  * macro to avoid include hell
@@ -168,8 +180,17 @@ do {									\
 	wake_up_locked(x); 						\
 	spin_unlock_irqrestore(&(x)->lock, flags);			\
 } while (0)
+#define wake_up_nested_poll(x, m, s)					\
+do {									\
+	unsigned long flags;						\
+									\
+	spin_lock_irqsave_nested(&(x)->lock, flags, (s));		\
+	wake_up_locked_poll(x, m);					\
+	spin_unlock_irqrestore(&(x)->lock, flags);			\
+} while (0)
 #else
 #define wake_up_nested(x, s)		wake_up(x)
+#define wake_up_nested_poll(x, m, s)	wake_up_poll(x, m)
 #endif
 
 #define __wait_event(wq, condition) 					\

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