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without
intervention in most cases, but on Windows, the entire python process
can
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buildbot
and manually kill the affected process.
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to
the SO_REUSEADDR socket option having different semantics on Windows
versus
Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM
sockets bind,
listen and then accept connections on identical host/ports. An
EADDRINUSE
OSError will be raised at some point (depending on the platform and
the order bind and listen were called on each socket).
However, on Windows, if SO_REUSEADDR is set on the sockets, no
EADDRINUSE
will ever be raised when attempting to bind two identical host/ports.
When
accept() is called on each socket, the second caller's process
will steal
the port from the first caller, leaving them both in an awkwardly
wedged
state where they'll no longer respond to any signals or graceful
kills, and
must be forcibly killed via OpenProcess()/TerminateProcess().
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instead of SO_REUSEADDR, which effectively affords the same semantics
as
SO_REUSEADDR on Unix. Given the propensity of Unix developers in the
Open
Source world compared to Windows ones, this is a common mistake. A
quick
look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR
when
openssl.exe is called with the 's_server' option, for
example. See
http://bugs.python.org/issue2550 for more info. The following site
also
has a very thorough description about the implications of both
REUSEADDR
and EXCLUSIVEADDRUSE on Windows:
http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
XXX: although this approach is a vast improvement on previous attempts
to
elicit unused ports, it rests heavily on the assumption that the
ephemeral
port returned to us by the OS won't immediately be dished back out
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