John O'Connor <tehj...@gmail.com> added the comment:
I started a draft in python. I am attaching the _pyio version along with tests.
I will continue work on the C implementation and eventually documentation if
this is well received. It seems straightforward, I am interested to see what
you guys think.
Also, there are now 2 places which use hasattr(self, "peek"). I was wondering
if it would make sense to add peek() to BufferedIOBase and raise
UnsupportedOperation or return b"".
Some benchmarks..
$ ./python -m timeit -s "from _pyio import open;f = open('LICENSE', 'rb');
b=bytearray(128)" 'while f.prefetch(b, 4, 4): pass'
_pyio.BufferedIOBase.prefetch:
100000 loops, best of 3: 10.6 usec per loop
_pyio.BufferedReader.prefetch:
100000 loops, best of 3: 6 usec per loop
$ ./python -m timeit -s "from _pyio import open;f = open('LICENSE',
'rb');b=bytearray(4);" 'while f.read(4): f.readinto(b)'
100000 loops, best of 3: 5.07 usec per loop
----------
keywords: +patch
Added file: http://bugs.python.org/file22168/issue12053-pyio.patch
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