Threads on Win32 with Blocking calls

[Aahz Maruch]

In article <Pine.LNX.4.31.0104222001420.1071-100000 at cb921.local>,
Campbell  <cb921 at voice.co.za> wrote:
>
>I've read in the thread documentation that not all blocking io functions
>work well under threads.  The C libs I am interfacing to are
>threadworthy, but I need a bunch of threads that all block without
>blocking each other.  Everything seems to point to this being the
>problem.. does anyone have tips or help, workaround or solution?

The classic example is socket.gethostbyname() which on many platforms
does not have a threadsafe, reentrant version.  If you're talking about
a library that you're interfacing to, and you want to release the global
interpreter lock to remove blocking, you'll need to write a Python
extension layer that uses the macros Py_BEGIN_ALLOW_THREADS and
Py_END_ALLOW_THREADS to wrap your library.
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