Merged revisions 294639 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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  r294639 | jpeeler | 2010-11-11 13:31:00 -0600 (Thu, 11 Nov 2010) | 53 lines
  
  Merged revisions 294384 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
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    r294384 | jpeeler | 2010-11-09 11:37:59 -0600 (Tue, 09 Nov 2010) | 47 lines
    
    Fix a deadlock in device state change processing.
    
    Copied from some notes from the original author (Russell):
    
    Deadlock scenario:
    Thread 1: device state change thread
      Holds - rdlock on contexts
      Holds - hints lock
      Waiting on channels container lock
    
    Thread 2: SIP monitor thread
      Holds the "iflock"
      Holds a sip_pvt lock
      Holds channel container lock
      Waiting for a channel lock
    
    Thread 3: A channel thread (chan_local in this case)
      Holds 2 channel locks acquired within app_dial
      Holds a 3rd channel lock it got inside of chan_local
      Holds a local_pvt lock
      Waiting on a rdlock of the contexts lock
    
    A bunch of other threads waiting on a wrlock of the contexts lock
    
    
    To address this deadlock, some locking order rules must be put in place and
    enforced. Existing relevant rules:
    
    1) channel lock before a pvt lock
    2) contexts lock before hints lock
    3) channels container before a channel
    
    What's missing is some enforcement of the order when you involve more than any
    two. To fix this problem, I put in some code that ensures that (at least in the
    code paths involved in this bug) the locks in (3) come before the locks in (2).
    To change the operation of thread 1 to comply, I converted the storage of hints
    to an astobj2 container. This allows processing of hints without holding the
    hints container lock. So, in the code path that led to thread 1's state, it no
    longer holds either the contexts or hints lock while it attempts to lock the
    channels container.
    
    (closes issue #18165)
    Reported by: antonio
    
    ABE-2583
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@294640 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk.h

@@ -78,6 +78,7 @@ int __ast_fdleak_dup(int oldfd, const char *file, int line, const char *func);
 
 int ast_set_priority(int);			/*!< Provided by asterisk.c */
 int ast_fd_init(void);				/*!< Provided by astfd.c */
+int ast_pbx_init(void);                         /*!< Provided by pbx.c */
 
 /*!
  * \brief Register a function to be executed before Asterisk exits.