Antoine Pitrou added the comment:
Please step back a bit and read the implementation of interrupt_main(): it
calls PyErr_SetInterrupt() (in signalmodule.c!), which merely sets an internal
flag saying SIGINT was received.
So, there: PyErr_SetInterrupt() already behaves like SIGINT, *except* that it
doesn't actually deliver a C signal, it merely sets a flag. Which is the
reason that it fails waking up C syscalls like select().
Demonstration:
>>> def handler(signum, frame):
... print("got signal %d!" % (signum,))
...
>>> signal.signal(signal.SIGINT, handler)
<built-in function default_int_handler>
>>> _thread.interrupt_main()
got signal 2!
In the end, making interrupt_main() *actually* deliver a SIGINT instead of
merely setting the internal flag for it will certainly be true to the original
intent.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29926>
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