mutex unlock check timeout to avoid double unlock.

lichao

2021-04-23 a04d4d01eb8e38b8ec5367114b5581bd64eee17e

 src/socket.cpp

@@ -59,7 +59,7 @@
            return false;
         }
         auto onMsg = [&](MsgI &imsg) {
            DEFER1(imsg.Release(shm()));
            DEFER1(imsg.Release());
            BHMsgHead head;
            if (imsg.ParseHead(head)) {
               onRecvWithPerMsgCB(*this, imsg, head);
@@ -118,7 +118,7 @@
      if (msg.ParseHead(head)) {
         return true;
      } else {
         msg.Release(shm());
         msg.Release();
      }
   }
   return false;