user message protocol is a protocol handles reliable data transmission over udp.

feartures: use sequence number to identify the packet to send acknowledge the packet received retransmission on timeouts compute and verify checksum full dumplex support simultaneous connect/close flow control: sliding window congestion control: slow start, congestion avoidance, fast retransmission and recovery silly window syndrome handling: delayed ack, active window detection rtt computation: ack of a retransmitted packet doesn't contribute to the estimated rtt state machine: closed->connectiing->established->closing->closed

required platform and libraries: Windows glib2 Microsoft C runtime

todo: more tests improve reliability support IPv6 support Linux profiling and optimizing

install or compile: see deploy.txt

a blog post http://hi.baidu.com/%B2%BB%D5%FD%D6%B1%B5%C4%C8%CB/blog/item/03927582baaca49df703a625.html