make sure realtime/high scheduling priority is relinquished before executing an AGI script (issue #4930)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6368 65c4cc65-6c06-0410-ace0-fbb531ad65f3

asterisk.c

@@ -674,7 +674,7 @@ static void set_icon(char *text)
 		fprintf(stdout, "\033]1;%s\007", text);
 }
 
-static int set_priority(int pri)
+int ast_set_priority(int pri)
 {
 	struct sched_param sched;
 	memset(&sched, 0, sizeof(sched));
@@ -1940,7 +1940,7 @@ int main(int argc, char *argv[])
 		ast_verbose("[ Reading Master Configuration ]");
 	ast_readconfig();
 
-	if (set_priority(option_highpriority)) {
+	if (ast_set_priority(option_highpriority)) {
 		exit(1);
 	}
 

include/asterisk.h

@@ -37,6 +37,8 @@ extern char ast_config_AST_CTL_OWNER[AST_CONFIG_MAX_PATH];
 extern char ast_config_AST_CTL_GROUP[AST_CONFIG_MAX_PATH];
 extern char ast_config_AST_CTL[AST_CONFIG_MAX_PATH];
 
+/* Provided by asterisk.c */
+extern int ast_set_priority(int);
 /* Provided by module.c */
 extern int load_modules(const int preload_only);
 /* Provided by pbx.c */

res/res_agi.c

@@ -279,6 +279,9 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op
 		for (x=STDERR_FILENO + 2;x<1024;x++) 
 			close(x);
 
+		/* Don't run AGI scripts with realtime priority -- it causes audio stutter */
+		ast_set_priority(0);
+
 		/* Execute script */
 		execv(script, argv);
 		/* Can't use ast_log since FD's are closed */