linux-kernel - [PATCH] signals-document-cld_continued-notification-mechanics-more

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Message-ID: <20080319182040.GA6387@tv-sign.ru>
Date:	Wed, 19 Mar 2008 21:20:40 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] signals-document-cld_continued-notification-mechanics-more

comments update for signals-document-cld_continued-notification-mechanics.patch

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 25/kernel/signal.c~DOC_1_NOTIFY	2008-03-18 17:25:19.000000000 +0300
+++ 25/kernel/signal.c	2008-03-19 20:53:45.000000000 +0300
@@ -1670,7 +1670,11 @@ relock:
 	try_to_freeze();
 
 	spin_lock_irq(&sighand->siglock);
-	/* see prepare_signal(SIGCONT) */
+	/*
+	 * Every stopped thread goes here after wakeup. Check to see if
+	 * we should notify the parent, prepare_signal(SIGCONT) encodes
+	 * the CLD_ si_code into SIGNAL_CLD_MASK bits.
+	 */
 	if (unlikely(signal->flags & SIGNAL_CLD_MASK)) {
 		int why = (signal->flags & SIGNAL_STOP_CONTINUED)
 				? CLD_CONTINUED : CLD_STOPPED;

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