Re: [HACKERS] Threads vs Processes (was: NuSphere and PostgreSQL for windows)

I do not know for sure to what extent GCC supports TLS on Windows. There are
compiler extensions that can be used under Windows, like __declspec(thread)
which automagically handles the declaration and initialization of the TLS
variable rather than dynamically calling the TlsAlloc, TlsFree, TlsSetValue,
and TlsGetValue. I also believe they have extensions in the compiler that
recognize that you are using TLS (when using __declspec) and therefore allow
you to access them without having to use the TlsSetValue and TlsGetValue.
Sorry I don't about GCC, but I hope this additional information helps.

Keith

-----Original Message-----
From: Bruce Momjian [mailto:pgman(at)candle(dot)pha(dot)pa(dot)us]
Sent: Thursday, September 25, 2003 11:57 AM
To: Keith Bottner
Cc: 'Tom Lane'; 'Claudio Natoli'; 'Robert Treat';
pgsql-hackers(at)postgresql(dot)org; pgsql-hackers-win32(at)postgresql(dot)org
Subject: Re: [HACKERS] Threads vs Processes (was: NuSphere and PostgreSQL
for windows)

Keith Bottner wrote:
> Typically variables that you want to be per-thread are stored in what
> Microsoft calls Thread Local Storage (TLS). Variables that you want
> shared you can just treat as globals and statics with the appropriate
> threading synchronization primitives. With Windows 2000 and later you
> have up to 1088 TLS locations that you can use, of course these can be
> pointers to memory which can store whatever you want.

Goes GCC on Windows support TLS, or only Microsoft compilers?

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