Re: TLS on windows (was: Re: Gfortran on Windows (mingw32) with OpenMP)

[Henry Kar Ming Chan <karminghenry at yahoo dot com>]

Hi, all,

After I refer to the Intel paper titled "Threading
Methodology : Principles and Practices" versin 2.0
published in 2003, I note the following message in the
article mentioning:(from page 22, web site :
http://cache-www.intel.com/cd/00/00/21/93/219349_threadingmethodology.pdf)

_____________________________________________________
OpenMP and thread libraries have mechanisms to create
thread-local storage. Threads can safely access this
storage without synchronization. Use the following
declarations to create thread-local storage in
different threading models:
? In OpenMP use threadprivate
? In Win32, use the TlsAlloc() function
? In Pthreads, use the pthread_key_create function
__________________________________________________

>From the above description, I think that "gfortran
with OpenMP" compiler can also implemented the TLS
using Win32 threads or Pthreads.

Please comment on the above implementation methods.

Thanks.

Best regards,
Henry Kar Ming Chan
 
--- FX Coudert <fxcoudert@gmail.com> wrote:

> [First, a warning: I'm neither an expert in TLS, nor
> in Windows nor  
> in GCC guts
> 
> > can we have chance to solve the
> > problem of threadprivate by adding the TLS support
> to
> > mingw32?
> 
> The support for TLS (Thread Local Storage) would
> probably come from  
> the compiler itself. Windows has TLS (see for
> example http:// 
>
dotnet.di.unipi.it/Content/sscli/docs/doxygen/pal/localstorage_8c-
> 
> source.html and
> http://www.ddj.com/dept/cpp/184403874, or the MSDN  
> documentation at
> http://msdn.microsoft.com/library/default.asp?url=/ 
> library/en-us/dllproc/base/tlsalloc.asp), so you'd
> "only" need to  
> teach GCC how to call that.
> 
> Now, I don't have competence, time and motivation to
> do that. So, if  
> my analysis above is correct, there are three things
> you can do: ask  
> around here if someone is interested in this and is
> planning to do  
> it; do it yourself, if you have the competence; find
> someone you  
> know, that you have leverage on, to do it :)
> 
> Now, for an idea of how much work it represents...
> perhaps someone  
> here can tell us?
> 
> FX
> 


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