merge new_loader_completion branch, including (at least):

  - restructured build tree and makefiles to eliminate recursion problems
  - support for embedded modules
  - support for static builds
  - simpler cross-compilation support
  - simpler module/loader interface (no exported symbols)



git-svn-id: http://svn.digium.com/svn/asterisk/trunk@40722 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 13 insertions, 2 deletions

diff --git a/include/asterisk/linkedlists.h b/include/asterisk/linkedlists.h
index bef63e0c0..fe09610ff 100644
--- a/include/asterisk/linkedlists.h
+++ b/include/asterisk/linkedlists.h
@@ -28,7 +28,7 @@
 */
 
 /*!
-  \brief Attempts to lock a list.
+  \brief Locks a list.
   \param head This is a pointer to the list head structure
 
   This macro attempts to place an exclusive lock in the
@@ -39,6 +39,17 @@
 	ast_mutex_lock(&(head)->lock) 
 	
 /*!
+  \brief Locks a list, without blocking if the list is locked.
+  \param head This is a pointer to the list head structure
+
+  This macro attempts to place an exclusive lock in the
+  list head structure pointed to by head.
+  Returns non-zero on success, 0 on failure
+*/
+#define AST_LIST_TRYLOCK(head)						\
+	ast_mutex_trylock(&(head)->lock) 
+	
+/*!
   \brief Attempts to unlock a list.
   \param head This is a pointer to the list head structure
 
@@ -209,7 +220,7 @@ struct {								\
 
 /*!
   \brief Returns the last entry contained in a list.
-  \param head This is a pointer to the list tail structure
+  \param head This is a pointer to the list head structure
  */
 #define	AST_LIST_LAST(head)	((head)->last)