gcc & GHC?
h(eye), ghc for win32 isn't cool. it remind me java in gcc 3.0. is there any ghc project as gcc front-end? then, we all happy on the technology of the GCC 3.0. mercury, also the front end of the gcc. http://gcc.gnu.org/frontends.html i am end user, so don't get me heavy/serious! Ah! john backus's FP.. sorry for random/ugly keyboard typing!! __ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: wait(2)
Thu, 26 Jul 2001 16:44:57 +0200, George Russell <[EMAIL PROTECTED]> pisze:
> Is there a way in Glasgow Haskell to get a thread to wait on a
> child process in the same way as the Posix function wait(), and
> get the termination status of the child?
There is no easy way: all Haskell's thread run in the same process
and wait() blocks the whole process.
The only (or the only portable) way is to call wait() with WNOHANG
repeatedly in a thread and threadDelay for a short period of time
between calls.
This is what OCaml runtime does. It provides waiting for a process
as a threading primitive. It accounts for waiting in its select()
loop in the scheduler.
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RE: wait(2)
> Is there a way in Glasgow Haskell to get a thread to wait on > a child process > in the same way as the Posix function wait(), and get the > termination status > of the child? If so, how? There's a couple of ways. The obvious way is to get the thread to place its result in an MVar when it exits: there's a guarantee that a thread always either exits or raises an exception, so you can wrap the top-level computation in something that places the result/exception in an MVar. Alternatively, you can foreign import rts_evalIO() and do it that way. It ought to work, but I haven't tried it. This way lets you get at the Interrupted or Deadlocked return states too, which you can't do solely within Haskell. Hmm, now I think about it, the compiler won't let you foreign import rts_evalIO() with the type you want, namely a -> Ptr b -> IO CInt, and quite rightly so. You'll need a version of rts_evalIO() that takes StablePtrs instead. Cheers, Simon ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Rationals
I wrote: > The package "std" has a Ratio.hi in the lib/imports directory > (std isn't described in the documentation) but including this > doesn't help - same error Oops, apologies, it turns out that this is correct for ghc, I just didn't include it in all the files that needed it. Amanda -- Amanda Clare http://users.aber.ac.uk/ajc99/ Tel: +44 (0)1970 621922 Fax: +44 (0)1970 622455 Dept. of Computer Science, University of Wales, Aberystwyth, SY23 3DB ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Rationals
Does anyone know how I use Rationals in ghc? In nhc I can just write let a = b % c But ghc-5.00.2 gives the error message "Variable not in scope: `%'" I've looked through the documentation and can't find any reference to a Rational library, or any other library that might have it. The package "std" has a Ratio.hi in the lib/imports directory (std isn't described in the documentation) but including this doesn't help - same error. The Haskell98 report says: "In particular, the type Rational is a ratio of two Integer values, as defined in the Rational library." Any ideas? Amanda -- Amanda Clare http://users.aber.ac.uk/ajc99/ Tel: +44 (0)1970 621922 Fax: +44 (0)1970 622455 Dept. of Computer Science, University of Wales, Aberystwyth, SY23 3DB ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
wait(2)
Is there a way in Glasgow Haskell to get a thread to wait on a child process in the same way as the Posix function wait(), and get the termination status of the child? If so, how? ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
