[project @ 2004-10-14 14:58:37 by simonmar]
Threaded RTS improvements: - Unix only: implement waitRead#, waitWrite# and delay# in Haskell, by having a single Haskell thread (the IO manager) performing a blocking select() operation. Threads communicate with the IO manager via channels. This is faster than doing the select() in the RTS, because we only restart the select() when a new request arrives, rather than each time around the scheduler. On Windows we just make blocking IO calls, we don't have a fancy IO manager (yet). - Simplify the scheduler for the threaded RTS, now that we don't have to wait for IO in the scheduler loop. - Remove detectBlackHoles(), which isn't used now (not sure how long this has been unused for... perhaps it was needed back when main threads used to be GC roots, so we had to check for blackholes manually rather than relying on the GC.) Signals aren't quite right in the threaded RTS. In fact, they're slightly worse than before, because the thread receiving signals might be blocked in a C call - previously there always be another thread stuck in awaitEvent() that would notice the signal, but that's not true now. I can't see an easy fix yet.
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