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bpo-44145: Release the GIL around HMAC_Update. (GH-26157) 

It was always meant to be released for parallelization.
This now matches the other similar code in the module.

Thanks michaelforney for noticing!
This commit is contained in:
Gregory P. Smith 2021-05-17 00:35:16 -07:00 committed by GitHub
parent b102dd598d
commit c10392e7dd
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2 changed files with 7 additions and 2 deletions
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Misc/NEWS.d/next/Library/2021-05-16-00-00-38.bpo-44145.ko5SJ7.rst Normal file
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@ -0,0 +1,3 @@
:mod:`hmac` computations were not releasing the GIL while calling the
OpenSSL ``HMAC_Update`` C API (a new feature in 3.9). This unintentionally
prevented parallel computation as other :mod:`hashlib` algorithms support.

6
Modules/_hashopenssl.c
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@ -1496,9 +1496,11 @@ _hmac_update(HMACobject *self, PyObject *obj)
}
if (self->lock != NULL) {
ENTER_HASHLIB(self);
Py_BEGIN_ALLOW_THREADS
PyThread_acquire_lock(self->lock, 1);
r = HMAC_Update(self->ctx, (const unsigned char*)view.buf, view.len);
LEAVE_HASHLIB(self);
PyThread_release_lock(self->lock);
Py_END_ALLOW_THREADS
} else {
r = HMAC_Update(self->ctx, (const unsigned char*)view.buf, view.len);
}