William "Chops" Westfield wrote:

>> Atomicity is a completely seperate issue as far as the compiler is  
>> concerned
> 
> Do any C compilers include support for "atomicity" ?  GCC doesn't,
> nor Intel's C compiler for x86, but it's something that might be more
> likely to show up in a microcontroller-oriented compiler.  

Not sure what you mean, but depending on what the processor and/or the
operating system supports, GCC, VC++ and Intel all support atomic
operations (e.g. on x86 for up to 32bit variables and on x64 processors
for up to 64bit variables). If needed with embedded assembly... 

But C is not a multi-threaded language, so to speak, as the existence of
several threads is not part of the C language definition. So this is
always an issue "besides" C; you have to consult operating system and
compiler manuals (the section about implementation specifics), not the C
manual.

Gerhard
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