Made uuid gen to thread_local.

redboltz · redboltz · commit a95250aa2b2d · 2021-10-18T23:43:45.000+09:00
It requires generetor creation cost only one timer per threads.
And then, no locks are required.
diff --git a/include/mqtt/broker/uuid.hpp b/include/mqtt/broker/uuid.hpp
@@ -19,7 +19,7 @@ MQTT_BROKER_NS_BEGIN
 
 inline std::string create_uuid_string() {
     // See https://github.com/boostorg/uuid/issues/121
-    auto gen = boost::uuids::random_generator();
+    static thread_local auto gen = boost::uuids::random_generator();
     return boost::uuids::to_string(gen());
 }
 

Original file line number	Diff line number	Diff line change
`@@ -19,7 +19,7 @@ MQTT_BROKER_NS_BEGIN`
`19`	`19`
`20`	`20`	`inline std::string create_uuid_string() {`
`21`	`21`	`// See https://github.com/boostorg/uuid/issues/121`
`22`		`- auto gen = boost::uuids::random_generator();`
	`22`	`+ static thread_local auto gen = boost::uuids::random_generator();`
`23`	`23`	`return boost::uuids::to_string(gen());`
`24`	`24`	`}`
`25`	`25`