[GHC] #732: Error in shutdownHaskell() in Win32 DLL

#732: Error in shutdownHaskell() in Win32 DLL
---------------------------------+------------------------------------------
    Reporter:  cschmidt@xxxxxxx  |        Owner:             
        Type:  bug               |       Status:  new        
    Priority:  normal            |    Milestone:  6.4.2      
   Component:  Runtime System    |      Version:  6.4.1      
    Severity:  normal            |     Keywords:             
          Os:  Windows           |   Difficulty:  Easy (1 hr)
Architecture:  Unknown           |  
---------------------------------+------------------------------------------
If an exception occurs in a Windows DLL produced by GHC,
 the following error message appears:

 {{{
 ghcDll: internal error: too many hs_exit()s
     Please report this as a bug to glasgow-haskell-bugs@xxxxxxxxxxx,
     or http://www.sourceforge.net/projects/ghc/
 }}}

 == How to reproduce ==

 1. Make a Haskell DLL using the enclosed Dll.hs and dllMain.c, e.g.
 {{{
 ghc -c Dll.hs -fglasgow-exts
 ghc -c dllMain.c
 ghc --mk-dll -o test.dll Dll.o Dll_stub.o dllMain.o
 }}}

 2. Generate an export library for the DLL, e.g.
 {{{
 lib /DEF:test.def /MACHINE:x86 /OUT:test.lib
 }}}

 3. Compile the executable with Visual C++ and run it.
 {{{
 cl -c testdll.cpp
 link testdll.obj test.lib /OUT:testdll.exe
 testdll.exe
 }}}

 Note: if I comment out the shutdownHaskell() call from dllMain.c
 (the line marked with /***/), it works fine.

 Kind regards,

 Cyril

  --- Dll.hs ---
 {{{
 module Dll (test) where

 foreign export ccall test :: IO ()

 test = error "Exception occurred"
 }}}

  --- dllMain.c ---
 {{{
 #include <windows.h>
 #include <Rts.h>

 extern void __stginit_Dll(void);

 static char* args[] = { "ghcDll", NULL };

 BOOL
 STDCALL
 DllMain
    ( HANDLE hModule
    , DWORD reason
    , void* reserved
    )
 {
   if (reason == DLL_PROCESS_ATTACH) {
       startupHaskell(1, args, __stginit_Dll);
       return TRUE;
   } else if (reason == DLL_PROCESS_DETACH) {
 /***/   shutdownHaskell();
   }
   return TRUE;
 }
 }}}

  --- test.def ---
 {{{
 EXPORTS
         test
 }}}

  --- testdll.cpp ---
 {{{
 extern "C" void test();

 int main() {
         test();
         return 0;
 }
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/732>
GHC <http://www.haskell.org/ghc/>
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