Re: optimization question
On Sun, Feb 22, 2004 at 12:20:35AM -0800, John Meacham wrote: case x of foo - Foo bar - Bar fuzz - Fuzz fuzo - Fuzo x - other .. thing The reason I ask is I am writing someting which will generate large case statements like the first form and want to know if I should bother pre-optimizing it to the second. John I suppose such things should be made by flex-style generators. Haskell has one (called Happy); I wonder how efficient it is compared to hand-written case .. of or if .. = .. scanners. I've heard flex is at least not worse than hand-written C code. -- Max ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
package name mismatch
Hello! Building htk, I've got an error: TestGetPut.hs:6: Module `GetPut' is located in package `Main' but its interface file claims it is part of package `uni-events-test' It happened (as far as I got) when ghc saw in current path the *.hi file built for installation. There are some ways to work around it, but, there was a lot of such places, so can I just skip the 'package name' check and go as it is? In http://www.haskell.org/pipermail/glasgow-haskell-users/2002-January/002849.html Simon Marlow said that it is a warning. That wold be nice, but I see an error. that's ghc-5.02 Max. ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: What isn't possible with Finite Maps, and should be.
On Thu, Nov 08, 2001 at 11:48:44PM +0100, George Russell wrote:
In any case it looks fairly simple to write. If only I were set up to be able
to compile GHC I could write the necessary code myself . . .
There's no need to rebuild the entire ghc system to hack the
data package. You onky need to update HSdata*.{o,a} from
{prefix}/lib/ghc-${VERSION} and *.hi files from import
directory. Just go to ${SOURCES}/hslibs/data and say
make HC=ghc.
I didn't try it to the end, but at least it compiles. You
can also just take all the '*.{,l}hs' files from
hslibs/data.
Max.
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Re: IO concurrency
I didn't try ghc-5.02 since I haven't installed it yet. Could you do that? The IO library in 5.00.2 had a bug in fdToHandle which meant that it didn't put the file descriptor into non-blocking mode, and I suspect this is the cause of your problem. It works. Thank you. Max. ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: IO concurrency
On Mon, Oct 15, 2001 at 04:47:25PM +0100, Simon Marlow wrote:
I tried this here on Linux/x86 with 5.02 and it seems to work fine.
Instead of the tcl/tk script you mentioned I used a FIFO in /tmp/fifo
and made the runProcess just call cat /tmp/fifo.
Which GHC version and platform is this on?
I test your example. It doesn't work for me. Both for 5.00.1
and 5.00.2. That's glibc-2.0.7/linux-2.2.19/x86 (does it
matter?). Tried both with '-O -fglasgow-exts' and no
options. I't quite stable behavior.
that's what strace told me:
succeeded case:
cut begin
gettimeofday({1002682961, 979251}, NULL) = 0
select(1, [0], [], NULL, {0, 0})= 0 (Timeout)
gettimeofday({1002682961, 980192}, NULL) = 0
write(1, tick\n, 5) = 5
gettimeofday({1002682961, 981179}, NULL) = 0
gettimeofday({1002682961, 981525}, NULL) = 0
select(1, [0], [], NULL, {1, 0})= 0 (Timeout)
gettimeofday({1002682962, 980292}, NULL) = 0
[skipped]
select(1, [0], [], NULL, {0, 0})= 0 (Timeout)
gettimeofday({1002682963, 162}, NULL) = 0
write(1, tick\n, 5) = 5
gettimeofday({1002682963, 1134}, NULL) = 0
gettimeofday({1002682963, 1497}, NULL) = 0
select(1, [0], [], NULL, {1, 0})= 0 (Timeout)
gettimeofday({1002682964, 433}, NULL) = 0
[skipped..repeated several times]
select(1, [0], [], NULL, {0, 0})= 0 (Timeout)
gettimeofday({1002682964, 20740}, NULL) = 0
write(1, tick\n, 5) = 5
gettimeofday({1002682964, 21560}, NULL) = 0
gettimeofday({1002682964, 21876}, NULL) = 0
select(1, [0], [], NULL, {1, 0})= 1 (in [0], left {0, 25})
read(0, qwertrt\n, 8192) = 8
write(1, qwertrt\n, 8)= 8
read(0, 0x8079f80, 8192)= -1 EAGAIN (Resource temporarily
unavailable)
gettimeofday({1002682964, 772256}, NULL) = 0
select(1, [0], [], NULL, {0, 26}) = 0 (Timeout)
gettimeofday({1002682965, 30227}, NULL) = 0
select(1, [0], [], NULL, {0, 0})= 0 (Timeout)
cut end
failed case:
cut begin
brk(0x8085000) = 0x8085000
write(1, tick\n, 5) = 5
gettimeofday({1002682710, 783155}, NULL) = 0
gettimeofday({1002682710, 783502}, NULL) = 0
select(0, [], [], NULL, {0, 0}) = 0 (Timeout)
read(4, click\n, 8192)= 6
write(1, click\n, 6) = 6
read(4, click\n, 8192)= 6
write(1, click\n, 6) = 6
cut end
I didn't try ghc-5.02 since I haven't installed it yet.
Max.
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