RE: cytpes and non executable memory

> But: mmap (or VirtualAlloc on Windows) return memory blocks 
> with a size
> rounded up to be a multiple of the system's pagesize - and it is
> somewhat wasteful to use a 4k block when only 20 or 30 bytes 
> are really
> needed.  So, it seems a very simple memory manager is needed. 
>  Since the
> block size is always the same, it probably wouldn't be too complicated
> to hack one, but isn't there a library I can reuse?

It occurs to me that you might be able to take the PyMalloc code from 
the Python core and hack it to use mmap() etc (instead of malloc()/free()) 
if you're only needing allocations up to 256 bytes...

I'm not sure whether thread safety is an issue - if ctypes doesn't release 
the GIL until it actually calls the foreign function it probably isn't 
an issue.

I came across another reference (may have been on python-dev) that some 
systems have limits on the number of mmap()ed regions you can have open 
at any given time.

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