Cancelling an XCTest run does not terminate underlying XCTest process on Windows

[ahoppen]

When you run swift test with XCTests on Windows and one of the tests hangs, then Ctrl-C on swift test, then the .xctest bundle continues running. This is particularly confusing because you can’t build the project again since the execution of the .xctest bundle still has exclusive access to the .xctest file and thus the linker can’t write out a new .xctest bundle, complaining that you don’t have sufficient permission.

[dschaefer2]

Interesting. Properly handling Ctrl-C on Windows is pretty different from pty. I had to deal with that many years a go when trying to cancel builds from a modelling tool we were working on. I'll have to read through the win32 docs to jog my memory.