[zeromq-dev] patch: non-blocking tcp accept

[Dhammika Pathirana]

Patch to add non-blocking tcp accept.

1. sets non-blocking flag in tcp listener socket
2. moves accept to tcp_listener.in_event()
3. passes native socket descriptor to tcp_socket constructor

Builds and tested on linux.
Would appreciate if someone can run a quick build on a win32 box.
Hopefully it'll build without any drama.

Requires few changes in zmq_server, perf and examples (mainly in
tcp_socket constructor).
If we're happy with this, I'll send a full patch.

Dhammika
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