Re: Native Threads in the RTS
On 29 Nov 2002, Alastair Reid wrote: > Consider Haskell functions a,b,c,d and C functions A,B,C,D and a call > pattern > > a -> A -> b -> B -> c -> C -> d -> D > > That is, a calls A, calls b, calls B, calls ... > > Suppose we want A,B,C,D executed by the same foreign thread. > > Each of a,b,c,d are executed by different Haskell threads (because a > new Haskell thread is spawned for each call into Haskell) so we have > multiple Haskell threads associated with a single foreign thread. It doesn't feel right to me that a,b,c,d are executed by different Haskell threads. Why shouldn't they all be the *same* Haskell thread? 1. Reasonable exception handling across the Haskell/foreign boundary is not currently supported, but if we imagine moving in that direction, it would seem we'd want a single thread for the given example. 2. Calling from foreign code into Haskell to a bound foreign import will require some special handling to ensure that a subsequent call out to foreign code will use the same native thread. Why couldn't this special handling select the same Haskell thread instead of creating a new one? Dean ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
help for "Killed"
I have a program that dies, saying simply "Killed". How can I tell what that means? I presume the program is suffering a ThreadKilled exception, and I guess it may be due to stack or heap overflow. (The program is processing a 50MB file.) Profiling, even with -xc, yields no information. Dean ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Network Programming with Haskell ?
that is what Concurrent is for, Haskell threads, (well GHC threads) are lightweight and can be used for selectlike purposes without too much overhead. I use them quite effectivly for complex networked applications.. see http://haskell.org/ghc/docs/latest/html/base/Control.Concurrent.html On Mon, Dec 02, 2002 at 11:07:24AM +0900, Ahn Ki-yung wrote: > No select or poll functions in Network module yet ? > > listenOn and accept isn't enough for network programming. > > IO multiplexing is needed. > > It was a wish list. > > -- > Ahn Ki-yung > > > ___ > Glasgow-haskell-users mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > -- --- John Meacham - California Institute of Technology, Alum. - [EMAIL PROTECTED] --- ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Network Programming with Haskell ?
On Mon, Dec 02, 2002 at 11:07:24AM +0900, Ahn Ki-yung wrote: > No select or poll functions in Network module yet ? > listenOn and accept isn't enough for network programming. > IO multiplexing is needed. > It was a wish list. c.f. util/Select.lhs Bill ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Network Programming with Haskell ?
No select or poll functions in Network module yet ? listenOn and accept isn't enough for network programming. IO multiplexing is needed. It was a wish list. -- Ahn Ki-yung ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Request: suppress specific warnings at specific places
I wrote: > > GHC's excellent warnings are very helpful. They would be somewhat > > more so if it were possible to suppress a warning about a specific bit > > of code Then "Simon Marlow" <[EMAIL PROTECTED]> wrote: > (of course, the workaround is to put the offending code into a module of > its own, and use OPTIONS to turn off the appropriate warnings). This doesn't seem to work (easily) for me. I want -Wall applied to all my source, so give it on the command line. Because the OPTIONS options get prepended, the -Wall seems to win out. :(. I could add -Wall at the top of all my source files, but that's unappealing. If GHC provided a way to have a command-line options appear before the OPTION options in the final list, that would work. mike ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
5.04.1 on OS X
Hello, is there a binary distribution for Mac OS x of GHC 5.04.1? Best regards, Nicolas Oury ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Calling haskell DLL from MSVC++
Hey!
I' having problems to call functions from a DLL made with ghc
with a C++ program, using Microsofts Visual C++
To learn how to do it, I tried the example found at
the user's guide (11.3, 11.4), but things aren't working out..
Here is as far as I've done:
I have a haskell module, MyModule.hs:module
MyModule whereforeign export stdcall fac :: Int ->
Intfac :: Int -> Intfac n | n <= 0 =
1 | otherwise = n * fac(n-1)
I compile it with: ghc -c
MyModule.hs -fffi
The .c file, containing the DLL initialization
is:
#include
#include
extern void __stginit_MyModule(void);
static char *args[] = {"MyDll", NULL};
BOOL STDCALL DllMain(HANDLE hModule, DWORD reason,
void *reserved){
int i;
if(reason ==
DLL_PROCESS_ATTACH){
printf("\nStarting Haskell");
startupHaskell(1, args, __stginit_MyModule);
printf("Haskell Started!!");
return
TRUE;
}
return TRUE;
}
Which I compile with: ghc -c MyDll.c
I build the DLL with: ghc
--mk-dll -o MyDll.dll MyModule.o MyModule_stub.o MyDll.o
The DLL is build, and following the example, I try
to call it from VB, but the program hangs. I don't know if I'm missing something
in the building process, I can't see what it can be.
Moreover, for calling it from my C++ programs, I
need a library file (generally called .lib in MSVC linker, I think it's
equivalent to the libMyLib.a of gcc) to resolve the function (fac) when
linking. I tried to use
dlltool -b MyDll.dll -l
MyDll.lib
to contruct the .lib file, it's contructed, but
yet, when I use to link my C++ program with the DLL, i got unresolved external
symbol for the function.
Thus, I can't even link the C++ program.
Note that I used the stdcall (for fac)to follow the example; I tried even
with ccall, but without success either.
Can someone see if I'm missing something at
the creation process of the dll? And to create the library file, is it the right
thing to do?
Mauricio
