Improve the build system to *properly* remove unnecessary symbols from the runtime global namespace. Along the way, change the prefixes on some internal-only API calls to use a common prefix.

With these changes, for a module to export symbols into the global namespace, it must have *both* the AST_MODFLAG_GLOBAL_SYMBOLS flag and a linker script that allows the linker to leave the symbols exposed in the module's .so file (see res_odbc.exports for an example).



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@182802 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/astobj2.h

@@ -188,15 +188,15 @@ int ao2_ref(void *o, int delta);
 #ifndef DEBUG_THREADS
 int ao2_lock(void *a);
 #else
-#define ao2_lock(a) _ao2_lock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
-int _ao2_lock(void *a, const char *file, const char *func, int line, const char *var);
+#define ao2_lock(a) __ao2_lock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
+int __ao2_lock(void *a, const char *file, const char *func, int line, const char *var);
 #endif
 
 #ifndef DEBUG_THREADS
 int ao2_trylock(void *a);
 #else
-#define ao2_trylock(a) _ao2_trylock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
-int _ao2_trylock(void *a, const char *file, const char *func, int line, const char *var);
+#define ao2_trylock(a) __ao2_trylock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
+int __ao2_trylock(void *a, const char *file, const char *func, int line, const char *var);
 #endif
 
 /*!
@@ -208,8 +208,8 @@ int _ao2_trylock(void *a, const char *file, const char *func, int line, const ch
 #ifndef DEBUG_THREADS
 int ao2_unlock(void *a);
 #else
-#define ao2_unlock(a) _ao2_unlock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
-int _ao2_unlock(void *a, const char *file, const char *func, int line, const char *var);
+#define ao2_unlock(a) __ao2_unlock(a, __FILE__, __PRETTY_FUNCTION__, __LINE__, #a)
+int __ao2_unlock(void *a, const char *file, const char *func, int line, const char *var);
 #endif
 
 /*!

include/asterisk/frame.h

@@ -399,9 +399,9 @@ struct ast_frame *ast_fralloc(char *source, int len);
 #endif
 
 /*!  
- * \brief Frees a frame 
+ * \brief Frees a frame or list of frames
  * 
- * \param fr Frame to free
+ * \param fr Frame to free, or head of list to free
  * \param cache Whether to consider this frame for frame caching
  */
 void ast_frame_free(struct ast_frame *fr, int cache);
@@ -415,6 +415,11 @@ void ast_frame_free(struct ast_frame *fr, int cache);
  * data malloc'd.  If you need to store frames, say for queueing, then
  * you should call this function.
  * \return Returns a frame on success, NULL on error
+ * \note This function may modify the frame passed to it, so you must
+ * not assume the frame will be intact after the isolated frame has
+ * been produced. In other words, calling this function on a frame
+ * should be the last operation you do with that frame before freeing
+ * it (or exiting the block, if the frame is on the stack.)
  */
 struct ast_frame *ast_frisolate(struct ast_frame *fr);
 

include/asterisk/linkedlists.h

@@ -685,7 +685,7 @@ struct {								\
   \param head This is a pointer to the list head structure
   \param list This is a pointer to the list to be appended.
   \param field This is the name of the field (declared using AST_LIST_ENTRY())
-  used to link entries of this list together.
+  used to link entries of the lists together.
 
   Note: The source list (the \a list parameter) will be empty after
   calling this macro (the list entries are \b moved to the target list).
@@ -704,6 +704,30 @@ struct {								\
 
 #define AST_RWLIST_APPEND_LIST AST_LIST_APPEND_LIST
 
+/*!
+  \brief Inserts a whole list after a specific entry in a list
+  \param head This is a pointer to the list head structure
+  \param list This is a pointer to the list to be inserted.
+  \param elm This is a pointer to the entry after which the new list should
+  be inserted.
+  \param field This is the name of the field (declared using AST_LIST_ENTRY())
+  used to link entries of the lists together.
+
+  Note: The source list (the \a list parameter) will be empty after
+  calling this macro (the list entries are \b moved to the target list).
+ */
+#define AST_LIST_INSERT_LIST_AFTER(head, list, elm, field) do {		\
+	(list)->last->field.next = (elm)->field.next;			\
+	(elm)->field.next = (list)->first;				\
+	if ((head)->last == elm) {					\
+		(head)->last = (list)->last;				\
+	}								\
+	(list)->first = NULL;						\
+	(list)->last = NULL;						\
+} while(0)
+
+#define AST_RWLIST_INSERT_LIST_AFTER AST_LIST_INSERT_LIST_AFTER
+
 /*!
   \brief Removes and returns the head entry from a list.
   \param head This is a pointer to the list head structure