[issue4751] Patch for better thread support in hashlib

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

First:  thanks for doing this.  I've had a patch sitting in my own
sandbox to release the GIL while hashing for a while but I hadn't
finished testing it.  It looks pretty similar to what you've done so
lets go with the patch being developed in this issue.

Rather than making HASHLIB_GIL_MINSIZE a constant I suggest making it a
property of the hash object so that it can be set by the user.  Most
users will be fine with the default but depending upon the application,
platform and hash algorithm being used other values may make more sense.

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nosy: +gregory.p.smith

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