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Fix race condition for CEL LINKEDID_END event

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This patch fixes to situations that could cause the CEL LINKEDID_END event to
be missed.

1) During a core stop gracefully, modules are unloaded when ast_active_channels
== 0. The LINKDEDID_END event fires during the channel destructor. This means
that occasionally, the cel_* module will be unloaded before the channel is
destroyed. It seemed generally useful to wait until the refcount of all
channels == 0 before unloading, so I added a channel counter and used it in the
shutdown code.

2) During a masquerade, ast_channel_change_linkedid is called. It calls
ast_cel_check_retire_linkedid which unrefs the linkedid in the linkedids
container in cel.c. It didn't ref the new linkedid. Now it does. 

Review: https://reviewboard.asterisk.org/r/1900/
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Merged revisions 367292 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 367299 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@367309 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Terry Wilson
2012-05-22 17:29:12 +00:00
parent 1ffb200c0e
commit c7f2d02ef1
6 changed files with 62 additions and 22 deletions
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5
include/asterisk/channel.h
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@@ -2104,9 +2104,12 @@ void ast_begin_shutdown(int hangup);
/*! Cancels an existing shutdown and returns to normal operation */
void ast_cancel_shutdown(void);
/*! \return number of active/allocated channels */
/*! \return number of channels available for lookup */
int ast_active_channels(void);
/*! \return the number of channels not yet destroyed */
int ast_undestroyed_channels(void);
/*! \return non-zero if Asterisk is being shut down */
int ast_shutting_down(void);