[Haskell-cafe] Top Level <-

Ganesh Sittampalam ganesh at earth.li
Mon Sep 1 01:33:25 EDT 2008

On Sun, 31 Aug 2008, Brandon S. Allbery KF8NH wrote:

> On 2008 Aug 31, at 13:20, Ganesh Sittampalam wrote:
>> I'm afraid I don't see how this generalises to sharing something across an 
>> entire process where the things that want to do the sharing are not in or 
>> controlled by the same shared library. In particular the filehandle 
>> structures required for buffered I/O need to be common to every single 
>> piece of code in the process that might want to use them, no matter what 
>> language or language implementation that code uses.
> For that you probably want to look at how ld.so.1 and libc interact to 
> share the malloc pool and the stdin/stdout/stderr, among others.

If buffered IO is handled by libc rather than by specific language 
runtimes, then the same mechanism of using global variables inside libc 
would work fine; but this technique doesn't extend to providing 
process-scope shared state for library code that might be loaded multiple 
times with no knowledge of the other instances.


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