While reading floatsleep() (time.sleep) code for issue #12459, I noticed that the Python signal handler is not called in floatsleep() if a signal interrupted the sleep. Well, it just "works" because the bytecode evaluation loop will call PyErr_CheckSignals() before executing the next instruction (the C signal handler signals calls Py_AddPendingCall whichs signals that the pending call to the eval loop using "eval_breaker"), but it would be better to call it directly. Attached calls explicitly and immediatly PyErr_CheckSignals() in the sleep and Windows implementations of floatsleep(). It's not really a bug, so I prefer to not touch Python 2.7 and 3.2, only Python 3.3.

You don't *need* to call PyErr_CheckSignals() explicitly, PyErr_SetFromErrno() does it for you.

The sleep implementation of floatsleep() doesn't call PyErr_SetFromErrno() if errno is EINTR, whereas EINTR indicates that select() was interrupted. I agree that PyErr_CheckSignals() is overkill in the Windows implementation. My new patch is more explicit: only add a special case for the select implementation, if errno is EINTR.

> My new patch is more explicit: only add a special case for the select > implementation, if errno is EINTR. Looks good to me!

New changeset 583be15e22ca by Victor Stinner in branch 'default': Issue #12462: time.sleep() now calls immediatly the (Python) signal handler if http://hg.python.org/cpython/rev/583be15e22ca