Ticket #84: [Portaudio] CreateThread vs. _beginthreadex in WMME.2.eml

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Date: Tue, 30 Sep 2008 18:30:30 +0100
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From: Stelios Bounanos <sb-lst@enotty.net>
To: portaudio@techweb.rfa.org
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Cc: Gordon Gidluck <gidluck@alltel.net>
Subject: Re: [Portaudio] CreateThread vs. _beginthreadex in WMME
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Hi,

>>>>> On Sun, 14 Sep 2008 10:59:51 -0500, Gordon Gidluck <gidluck@alltel.net> said:

> Ross,
> Changes are committed in SVN for pa_win_wmme.c and pa_win_wdmks.c . 
> There is a small issue with data types with wasapi and I have emailed 
> David Viens hoping that he can look into that.

> The V19 code builds on Visual Studio 2008. I just had to download ASIO 
> code from Steinberg and also get a DirectX SDK from Microsoft for the build.
> VS2008 converts two files (.sln and .vcproj) when importing the Visual 
> Studio 2005 project.

SVN changeset 1388 ("change CreateThread to _beginthreadex") breaks
compilation on cygwin:

% ./configure --prefix=/usr/local/portaudio --enable-static --disable-shared
% make
% make install
% cd test
% gcc -o pa_devs.exe pa_devs.c $(pkg-config --cflags --libs portaudio-2.0)
/usr/local/portaudio/lib/libportaudio.a(pa_win_wmme.o): In function `StartStream':
/usr/local/src/portaudio/trunk/src/hostapi/wmme/pa_win_wmme.c:3247: undefined reference to `__beginthreadex'
collect2: ld returned 1 exit status

It works with that changeset reverted.

The _beginthreadex function is specific to Microsoft's toolchain:

  http://www.cygwin.com/ml/cygwin/2005-01/msg00892.html

The above thread, as well as the following email, also suggest that
there is no memory leak associated with CreateThread on cygwin:

  http://cygwin.com/ml/cygwin/2001-07/msg01176.html

Since cygwin's gcc defines __GNUC__ and __CYGWIN__ it would be trivial
to call _beginthreadex or CreateThread with a preprocessor conditional.


Regards,
Stelios.
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