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Duncan Coutts authored
This is the RTS part of a patch to base's topHandler to handle exiting by a signal. The intended behaviour is that on Unix, throwing ExitFailure (-sig) results in the process terminating with that signal. Previously shutdownHaskellAndSignal was only used for exiting with SIGINT due to the UserInterrupt exception. Improve shutdownHaskellAndSignal to do the signal part more carefully. In particular, it (should) now reliably terminates the process one way or another. Previusly if the signal was blocked, ignored or handled then shutdownHaskellAndSignal would actually return! Also, the topHandler code has two paths a careful shutdown and a "fast exit" where it does not give finalisers a chance to run. We want to support that mode also when we want to exit by signal. So rather than the base code directly calling stg_exit as it did before, we have a fastExit bool paramater for both shutdownHaskellAnd{Exit,Signal}.
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