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channel locking: Add locking for channel snapshot creation

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Original commit message by mmichelson (asterisk 12 r403311):

"This adds channel locks around calls to create channel snapshots as well
as other functions which operate on a channel and then end up
creating a channel snapshot. Functions that expect the channel to be
locked prior to being called have had their documentation updated to
indicate such."

The above was initially committed and then reverted at r403398.  The problem
was found to be in core_local.c in the publish_local_bridge_message function.
The ast_unreal_lock_all function locks and adds a reference to the returned
channels and while they were being unlocked they were not being unreffed when
no longer needed.  Fixed by unreffing the channels.

Also in bridge.c a lock was obtained on "other->chan", but then an attempt was
made to unlock "other" and not the previously locked channel.  Fixed by
unlocking "other->chan"

(closes issue ASTERISK-22709)
Reported by: John Bigelow
........

Merged revisions 404237 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404260 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin Harwell
2013-12-18 20:33:37 +00:00
parent 86b5e11607
commit 28c0cb28d0
53 changed files with 340 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
apps/app_queue.c
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@@ -2040,8 +2040,12 @@ static void queue_publish_multi_channel_blob(struct ast_channel *caller, struct
RAII_VAR(struct ast_channel_snapshot *, caller_snapshot, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel_snapshot *, agent_snapshot, NULL, ao2_cleanup);
ast_channel_lock(caller);
caller_snapshot = ast_channel_snapshot_create(caller);
ast_channel_unlock(caller);
ast_channel_lock(agent);
agent_snapshot = ast_channel_snapshot_create(agent);
ast_channel_unlock(agent);
if (!caller_snapshot || !agent_snapshot) {
return;
@@ -3452,7 +3456,9 @@ static int join_queue(char *queuename, struct queue_ent *qe, enum queue_result *
"Queue", q->name,
"Position", qe->pos,
"Count", q->count);
ast_channel_lock(qe->chan);
ast_channel_publish_blob(qe->chan, queue_caller_join_type(), blob);
ast_channel_unlock(qe->chan);
ast_debug(1, "Queue '%s' Join, Channel '%s', Position '%d'\n", q->name, ast_channel_name(qe->chan), qe->pos );
}
ao2_unlock(q);
@@ -3731,7 +3737,9 @@ static void leave_queue(struct queue_ent *qe)
"Queue", q->name,
"Position", qe->pos,
"Count", q->count);
ast_channel_lock(qe->chan);
ast_channel_publish_blob(qe->chan, queue_caller_leave_type(), blob);
ast_channel_unlock(qe->chan);
ast_debug(1, "Queue '%s' Leave, Channel '%s'\n", q->name, ast_channel_name(qe->chan));
/* Take us out of the queue */
if (prev) {
@@ -4329,10 +4337,13 @@ static void record_abandoned(struct queue_ent *qe)
"Position", qe->pos,
"OriginalPosition", qe->opos,
"HoldTime", (int)(time(NULL) - qe->start));
ast_channel_publish_blob(qe->chan, queue_caller_abandon_type(), blob);
qe->parent->callsabandoned++;
ao2_unlock(qe->parent);
ast_channel_lock(qe->chan);
ast_channel_publish_blob(qe->chan, queue_caller_abandon_type(), blob);
ast_channel_unlock(qe->chan);
}
/*! \brief RNA == Ring No Answer. Common code that is executed when we try a queue member and they don't answer. */