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Simon Marlow authored
Fixes #637. The implications of this change are: - threadDelay on Windows no longer creates a new OS thread each time, instead it communicates with the IO manager thread in the same way as on Unix. - deadlock detection now works the same way on Windows as on Unix; that is the timer interrupt wakes up the IO manager thread, which causes the scheduler to check for deadlock. - Console events now get sent to the IO manager thread, in the same way as signals do on Unix. This means that console events should behave more reliably with -threaded on Windows. All this applies only with -threaded. Without -threaded, the old ConsoleEvent code is still used. After some testing, this could be pushed to the 6.6 branch.
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