Re: [Help-glpk] GLPK 4.61: thread local storage in Windows DLL

[Heinrich Schuchardt]

Hello Andrew,

https://msdn.microsoft.com/en-us/library/6yh4a9k1.aspx
describes when the Windows specific restrictions for thread local
storage in DLLs apply:
"On Windows operating systems before Windows Vista"

We should check the Windows version in DllMain and return false if the
Windows Version is below Vista and symbol TLS is defined.

Please, apply the appended patch.

Best regards

Heinrich

On 01/09/2017 08:32 PM, Heinrich Schuchardt wrote:
> Hello David,
> 
> the thread local storage is not correctly implemented for usage with
> Windows in a DLL. See
> 
> https://msdn.microsoft.com/en-us/library/windows/desktop/ms686997
> 
> I think we should do the following:
> 
> Write a test case that demonstrates the usage of multithreading GLPK
> using the pthread library.
> 
> Add a pthread emulation for Windows so we can use the same test code
> with Windows and with Posix. For a minimalistic implementation see
> http://sqlstat.sourceforge.net/doxygen/html/sqlthread_8h_source.html
> 
> Rewrite the allocation and freeing of the env variable according to the
> Windows DLL requirements.
> 
> Best regards
> 
> Heinrich Schuchardt
> 
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0001-Check-Windows-version-when-using-TLS.patch
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