[issue32186] io.FileIO hang all threads if fstat blocks on inaccessible NFS server

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

We already release the GIL when calling lseek() in fileio.c, in the portable_lseek() function. So it makes sense to also do it in _io_FileIO_readall_impl() in the same file. os.lseek() also releases the GIL. 

I found another functions which calls lseek() without releasing the GIL:

* the Windows implementation of new_mmap_object()
* _Py_DisplaySourceLine()
* fp_setreadl() of Parser/tokenizer.c

I'm not sure that these 3 functions should be modified. In case of doubt, I prefer to not touch the code.

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<https://bugs.python.org/issue32186>
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