Re: [Haskell-cafe] fcntl locks, executeFile and threaded runtime

While I'm grasping at straws, might as well mention that the threaded runtime uses signals, lots of signals, and that can break things that are interruptible and haven't been adequately signal-proofed. For example, earlier in this exchange I included a short program that uses System.Posix.Unistd.sleep, and on MacOS anyway, that breaks with -threaded -- the sleep doesn't sleep for any appreciable time before it gets interrupted by the flood of runtime ALRM signals. I can't account for any obvious reason why signal interrupts could cause the present problem, but it's easy enough to test if you're curious - just compile with -rtsopts, and pass the -V0 flag to the runtime. (E.e.g., ./a.out +RTS -V0 -RTS, GHCRTS=-V0 ./a.out, ...) Donn