From 88cea437ab547d93a17ca6988fc5accddde1ced1 Mon Sep 17 00:00:00 2001
From: "Kevin P. Fleming" <kpfleming@digium.com>
Date: Fri, 28 Jul 2006 19:58:53 +0000
Subject: [PATCH] just for fun, let's lock the whisper buffer for writing AND
 reading :-)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@38441 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/channel.c b/channel.c
index d8b3e83ecb..965f87c775 100644
--- a/channel.c
+++ b/channel.c
@@ -2469,8 +2469,10 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
 						.samples = f->samples,
 					};
 
+					ast_mutex_lock(&chan->whisper->lock);
 					if (ast_slinfactory_read(&chan->whisper->sf, buf, f->samples))
 						ast_frame_slinear_sum(f, &whisper);
+					ast_mutex_unlock(&chan->whisper->lock);
 				}
 			}