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wolfgang authored
Threaded RTS: Don't start new worker threads earlier than necessary. After this commit, a Haskell program that uses neither forkOS nor forkIO is really single-threaded (rather than using two OS threads internally). Some details: Worker threads are now only created when a capability is released, and only when (there are no worker threads) && (there are runnable Haskell threads || there are Haskell threads blocked on IO or threadDelay) awaitEvent can now be called from bound thread scheduling loops (so that we don't have to create a worker thread just to run awaitEvent)
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