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.
Ganesh
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