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Merged revisions 187428 via svnmerge from

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

........
  r187428 | tilghman | 2009-04-09 13:08:20 -0500 (Thu, 09 Apr 2009) | 8 lines
  
  Race condition between ast_cli_command() and 'module unload' could cause a deadlock.
  Add lock timeouts to avoid this potential deadlock.
  (closes issue #14705)
   Reported by: jamessan
   Patches: 
         20090320__bug14705.diff.txt uploaded by tilghman (license 14)
   Tested by: jamessan
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@187483 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2009-04-09 18:40:01 +00:00
parent 19f381b484
commit 39808fa953
3 changed files with 208 additions and 6 deletions
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25
include/asterisk/linkedlists.h
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@@ -51,6 +51,18 @@
#define AST_RWLIST_WRLOCK(head) \
ast_rwlock_wrlock(&(head)->lock)
/*!
\brief Write locks a list, with timeout.
\param head This is a pointer to the list head structure
\param tv Pointer to a timeval structure
This macro attempts to place an exclusive write lock in the
list head structure pointed to by head.
\retval 0 on success
\retval non-zero on failure
*/
#define AST_RWLIST_TIMEDWRLOCK(head,tv) ast_rwlock_timedwrlock(&(head)->lock, tv)
/*!
\brief Read locks a list.
\param head This is a pointer to the list head structure
@@ -63,6 +75,19 @@
#define AST_RWLIST_RDLOCK(head) \
ast_rwlock_rdlock(&(head)->lock)
/*!
\brief Read locks a list, with timeout.
\param head This is a pointer to the list head structure
\param tv Pointer to a timeval structure
This macro attempts to place a read lock in the
list head structure pointed to by head.
\retval 0 on success
\retval non-zero on failure
*/
#define AST_RWLIST_TIMEDRDLOCK(head,tv) \
ast_rwlock_timedrdlock(&(head)->lock, tv)
/*!
\brief Locks a list, without blocking if the list is locked.
\param head This is a pointer to the list head structure