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Attached are two source files (one .c, one .hs), which are compiled (using mk.sh) into DsoHsDemo.dll. When this library is loaded, using the following C snippet:

int main(int argc, char* argv[])
{
    printf("Started LoadLibrary\n");
    LoadLibrary("DsoHsDemo.dll");
    printf("Finished LoadLibrary\n");
}

The program freezes:

$ ./mk.sh && ./CSnippet
The Glorious Glasgow Haskell Compilation System, version 6.12.0.20091010
Creating library file: DsoHsDemo.dll.a
Started LoadLibrary
pre hs_init
<program freezes>

The freeze only occurs when the dll is linked with -threaded, and happens within either startupHaskell, or (if you call hs_init/hs_add_root instead) within hs_add_root. This happens with GHC 6.10.4 and 6.12rc1 on Windows XP.

This bug appears to make it impossible to successfully build a DLL for multithreaded use.

Trac metadata

Trac field	Value
Version	6.12.1 RC1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	ndmitchell@gmail.com
Operating system
Architecture