This commits the performance mods that give the priority processing engine in the pbx, a 25-30% speed boost. The two updates used, are, first, to merge the ast_exists_extension() and the ast_spawn_extension() where they are called sequentially in a loop in the code, into a slightly upgraded version of ast_spawn_extension(), with a few extra args; and, second, I modified the substitute_variables_helper_full, so it zeroes out the byte after the evaluated string instead of demanding you pre-zero the buffer; I also went thru the code and removed the code that zeroed this buffer before every call to the substitute_variables_helper_full. The first fix provides about a 9% speedup, and the second the rest. These figures come from the 'PIPS' benchmark I describe in blogs, conf. reports, etc.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@88166 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_playback.c

@@ -202,7 +202,6 @@ static int do_say(say_args_t *a, const char *s, const char *options, int depth)
 		ast_trim_blanks(x);
 
 		/* replace variables */
-		memset(fn, 0, sizeof(fn)); /* XXX why isn't done in pbx_substitute_variables_helper! */
 		pbx_substitute_variables_varshead(&head, x, fn, sizeof(fn));
 		ast_log(LOG_WARNING, "doing [%s]\n", fn);