[issue815646] thread unsafe file objects cause crash

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Some good news: I've found a way to continue with my approach and make
it working. The close() method now raises an appropriate IOError when
another method is being called from another thread. Attaching a patch,
which protects a bunch of file object methods (together with tests). 

Now the bad news: the protection logic in fileobject.c is, hmm, a bit
contrived (and I'm not even sure it's 100% correct). If someone wants to
read it and put his veto before I go further...

Added file: http://bugs.python.org/file9884/filethread2.patch

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