HTTP: Stop accepting requests on final system shutdown.

There are three CLI commands to stop and restart Asterisk each.

1) core stop/restart now - Hangup all calls and stop or restart Asterisk.
New channels are prevented while the shutdown request is pending.

2) core stop/restart gracefully - Stop or restart Asterisk when there are
no calls remaining in the system.  New channels are prevented while the
shutdown request is pending.

3) core stop/restart when convenient - Stop or restart Asterisk when there
are no calls in the system.  New calls are not prevented while the
shutdown request is pending.

ARI has made stopping/restarting Asterisk more problematic.  While a
shutdown request is pending it is desirable to continue to process ARI
HTTP requests for current calls.  To handle the current calls while a
shutdown request is pending, a new committed to shutdown phase is needed
so ARI applications can deal with the calls until the system is fully
committed to shutdown.

* Added a new shutdown committed phase so ARI applications can deal with
calls until the final committed to shutdown phase is reached.

* Made refuse new HTTP requests when the system has reached the final
system shutdown phase.  Starting anything while the system is actively
releasing resources and unloading modules is not a good thing.

* Split the bridging framework shutdown to not cleanup the global bridging
containers when shutting down in a hurry.  This is similar to how other
modules prevent crashes on rapid system shutdown.

* Moved ast_begin_shutdown(), ast_cancel_shutdown(), and
ast_shutting_down().  You should not have to include channel.h just to
access these system functions.

ASTERISK-24752 #close
Reported by: Matthew Jordan

Review: https://reviewboard.asterisk.org/r/4399/
........

Merged revisions 431692 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431694 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 2 insertions, 21 deletions

diff --git a/main/channel.c b/main/channel.c
index aab8e228c..f8ae442b9 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -100,9 +100,6 @@ struct ast_epoll_data {
 #define MONITOR_DELAY	150 * 8		/*!< 150 ms of MONITORING DELAY */
 #endif
 
-/*! \brief Prevent new channel allocation if shutting down. */
-static int shutting_down;
-
 static int chancount;
 
 unsigned long global_fin, global_fout;
@@ -507,13 +504,9 @@ static int ast_channel_softhangup_cb(void *obj, void *arg, int flags)
 	return 0;
 }
 
-void ast_begin_shutdown(int hangup)
+void ast_softhangup_all(void)
 {
-	shutting_down = 1;
-
-	if (hangup) {
-		ao2_callback(channels, OBJ_NODATA | OBJ_MULTIPLE, ast_channel_softhangup_cb, NULL);
-	}
+	ao2_callback(channels, OBJ_NODATA | OBJ_MULTIPLE, ast_channel_softhangup_cb, NULL);
 }
 
 /*! \brief returns number of active/allocated channels */
@@ -527,18 +520,6 @@ int ast_undestroyed_channels(void)
 	return ast_atomic_fetchadd_int(&chancount, 0);
 }
 
-/*! \brief Cancel a shutdown in progress */
-void ast_cancel_shutdown(void)
-{
-	shutting_down = 0;
-}
-
-/*! \brief Returns non-zero if Asterisk is being shut down */
-int ast_shutting_down(void)
-{
-	return shutting_down;
-}
-
 /*! \brief Set when to hangup channel */
 void ast_channel_setwhentohangup_tv(struct ast_channel *chan, struct timeval offset)
 {