Dnia 12-06-2010 o 09:28:58 Jérôme M. Berger <[email protected]> napisał(a):
Daniel Keep wrote:
immutable means "no one can modify this."
const means "someone might be able to modify this, but not you can't."
So?
Basically, what the OP said, is that we need readers-writer locks
[1]. A const synchronized method would use the read lock (and
therefore several threads can access the same object through *const*
synchronized methods simultaneously), but a non const synchronized
method would use the read-write lock (which would prevent anyone
else from accessing the same object through a synchronized method,
be it const or not).
Jerome
[1] http://en.wikipedia.org/wiki/Readers-writer_lock
Exactly.
How is synchronization implemented in D right now? Would there be room to
let the lock distinguish reads & writes?
Tomek
