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Re: W32 version crashes on C-g

From: Kim F. Storm
Subject: Re: W32 version crashes on C-g
Date: Sun, 19 Mar 2006 02:32:04 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

"Juanma Barranquero" <address@hidden> writes:

> BTW, if you have extra free time ;-) you could take a look at the
> "100% CPU on socket select" problem... :-)

Here is what I have done so far ...  Somebody more familiar with
W32 programming should take over from here!

[from admin/FOR-RELEASE]

** TCP server processes do not work on Windows.

TCP/IP server processes created with `make-network-process' consume
excesive CPU on some Windows environments.  Usages of 50% and 100%
CPU time have been observed on different Window XP configurations.
Seems to be a problem in sys_select in w32proc.c.

In its current form, it sys_select says the socket is ready, so we
call server_accept_connection which again calls accept() which returns
-1 with errno == WSAEWOULDBLOCK (10035) indicating that there is no
pending connection to accept.

It seems that to fix this, w32 server sockets must use WSAAsyncSelect
+ FD_ACCEPT to request notifications of incoming connections...

Kim F. Storm <address@hidden> http://www.cua.dk

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