fix sendq lock, use different mutexes for in,out.

lichao

2021-04-15 af86015d724e5edf001aa024fe7d8581c45cffd9

 src/msg.cpp

@@ -78,6 +78,14 @@
   return true;
}

bool MsgI::EnableRefCount(SharedMemory &shm)
{
   if (!IsCounted()) {
      count_ = shm.New<RefCount>();
   }
   return IsCounted();
}

int MsgI::Release(SharedMemory &shm)
{
   if (IsCounted()) {