Re: why the 16meg space size limit?

["Alexei Pytel" <pytel@xxxxxxxxxx>]

OS/400 supports memory-mapped stream files in V5R1 - see "mmap()--Memory
Map a File".


    Alexei Pytel




                                                                                
              
                    "Steve                                                      
              
                    Richter"             To:     <MI400@midrange.com>           
              
                    <srichter@Auto       cc:                                    
              
                    Coder.com>           Subject:     Re: why the 16meg space 
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                    05/21/2001                                                  
              
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>So I am back to my question - what is so special about *USRSPC object that
>you want it to be larger than 16MB ?


alexei,

another example:

the win32 api provides memory mapped files. a windows pgm calls two api's:
CreateFileMapping and MapViewOfFile.  The end result is a 32 bit ptr into a
flat file that can be shared between processes on the system. It is the
same
as a space.

The pgmr can move the ptr anywhere within the memory mapped space. The
range
of movement is the 32 bit addr limit:  2 gig?.  Pgm variables based on the
ptr can be copied to. This will copy data to the shared memory mapped file
making it available to other processes on the system.

Does linux have this capability?  If it does, how does the iseries
implement
this functionality when linux is run on the iseries?

If it does not, what happens when mr torvalds decides to implement it?
Will
linux no longer be able to run on the iseries?



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