[issue1798] Add ctypes calling convention that allows safe access of errno

Thomas Heller report at bugs.python.org
Fri May 23 15:42:31 CEST 2008


Thomas Heller <theller at ctypes.org> added the comment:

But would it hurt to set errno to zero before *any* function call?

My experiments show that it is faster to clear errno always
instead of trying to get a previously set value from tls storage in a
ctypes-global object created by calling "threading.local()".

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