threadpool, res_pjsip: Add serializer group shutdown API calls.

A module trying to unload needs to wait for all serializers it creates and
uses to complete processing before unloading.

ASTERISK-24907
Reported by: Kevin Harwell

Change-Id: I8c80b90f2f82754e8dbb02ddf3c9121e5e966059

1 files changed, 7 insertions, 2 deletions

diff --git a/res/res_pjsip.c b/res/res_pjsip.c
index 8d5adf6a7..23cf2f0dd 100644
--- a/res/res_pjsip.c
+++ b/res/res_pjsip.c
@@ -3327,20 +3327,25 @@ int ast_sip_append_body(pjsip_tx_data *tdata, const char *body_text)
 	return 0;
 }
 
-struct ast_taskprocessor *ast_sip_create_serializer(void)
+struct ast_taskprocessor *ast_sip_create_serializer_group(struct ast_serializer_shutdown_group *shutdown_group)
 {
 	struct ast_taskprocessor *serializer;
 	char name[AST_UUID_STR_LEN];
 
 	ast_uuid_generate_str(name, sizeof(name));
 
-	serializer = ast_threadpool_serializer(name, sip_threadpool);
+	serializer = ast_threadpool_serializer_group(name, sip_threadpool, shutdown_group);
 	if (!serializer) {
 		return NULL;
 	}
 	return serializer;
 }
 
+struct ast_taskprocessor *ast_sip_create_serializer(void)
+{
+	return ast_sip_create_serializer_group(NULL);
+}
+
 /*!
  * \internal
  * \brief Shutdown the serializers in the default pool.