winsock recv incomplete message problem

[MikeAThon]

If you are sharing the receiveBuffer1 buffer amongst four different threads, then you probably lack synchronization between the threads, such that one thread is writing to the buffer (maybe the main thread) while other threads expect the buffer to be constant.

Incidentally, creating a new thread is time-consuming, and your code apparently does so for each and every new datagram that's received. A better architecture would be a thread pool, where all threads in the pool are already created, but are in a wait state until work is given to them. That way, there's no overhead lost in thread creation.

Mike