cross platform 64bit lock free FIFO?

I've found info on know how to implement a lock free FIFO on 32bit  
systems, but I've also read that making it work for 64bit systems with the  
current instruction sets is very difficult and extremely error prone. So I  
would prefer to use a proven solution, instead of trying to roll my own.  
On Windows, it's easy, because the Win32 API provides an interlocked  
SList, that is supposed to work on 64 bit platforms too. But what about  
other operating systems? Also, AFAIK these new 64bit systems don't really  
have a 64bit address space, but 40-44? Does this mean, that all these  
64bit implementations are doing is only using the top 20 bits for ABA  
resolution?? I'm confused :)



Andras

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