Merged revisions 179461 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r179461 | russell | 2009-03-02 16:58:18 -0600 (Mon, 02 Mar 2009) | 8 lines

Ensure that only one thread is calling ast_settimeout() on a channel at a time.

For example, with an IAX2 channel, you can have both the channel thread and the
chan_iax2 processing threads calling this function, and doing so twice at the
same time is a bad thing.

(Found in a debugging session with dvossel and mmichelson)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@179462 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -2243,7 +2243,10 @@ int ast_settimeout(struct ast_channel *c, unsigned int rate, int (*func)(const v
 	int res;
 	unsigned int real_rate = rate, max_rate;
 
+	ast_channel_lock(c);
+
 	if (c->timingfd == -1) {
+		ast_channel_unlock(c);
 		return -1;
 	}
 
@@ -2263,6 +2266,8 @@ int ast_settimeout(struct ast_channel *c, unsigned int rate, int (*func)(const v
 	c->timingfunc = func;
 	c->timingdata = data;
 
+	ast_channel_unlock(c);
+
 	return res;
 }