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Linking to multi-threaded MinGW DLL from Cygwin
- From: Soren Hein <soren dot hein at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 9 Jun 2014 08:53:40 +0000 (UTC)
- Subject: Linking to multi-threaded MinGW DLL from Cygwin
- Authentication-results: sourceware.org; auth=none
I have a third-party, multi-threaded DLL (with .h file and .def file) that has
been compiled using minGW. The DLL uses the Windows threadpool API.
I want to use this DLL from Cygwin. What I'm actually doing is linking to this
DLL from Perl XS code, and functionally speaking, this now works fine. (I had
to make sure to use __stdcall from the Cygwin side.) I use gcc/g++ v4.8.2.
Now that it works, I'm getting greedy and I want to take advantage of the
multi-threading on the DLL side, since there is a great deal of parallelism in
the function that the DLL performs.
I shouldn't have to do anything on the Cygwin side to achieve this. And yet
the DLL is behaving in a single-threaded way and not showing the speed-up that
I'm wondering if two threading models are colliding here, but then the DLL
doesn't fail completely. When compiling the XS code, there is a flag that I
don't understand called
which sounds a bit ominous. I've tried -mno-cygwin since I read about that,
but that doesn't seem to work anymore. Any help for a newbie is appreciated.
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