On Jul 5, 2008, at 3:00 PM, Joan Lluch (casa) wrote:
However, let me copy an excerpt of the Cocoa documentation on the GC
algorithm that Cocoa uses.
You haven't updated your documentation since the beginning of November
last year.
<begin excerpt>
[...]
The collector runs exclusively on the main thread of the
application. At no time are all threads stopped for a collection
cycle, and each thread is stopped for as short a time as is
possible. Threads may be blocked for a short time while all
unreachable objects are formed into the garbage list and weak
references zeroed. Only threads that have directly or indirectly
performed an[NSThread self] operation are subject to garbage
collection.
This is not correct for the current implementation of the collector:
The collector is both request and demand driven. The Cocoa
implementation makes requests at appropriate times. You can also
programmatically request consideration of a garbage collection cycle,
and if a memory threshold has been exceeded a collection is run
automatically.
The collector runs on its own thread in the application. At no time
are all threads stopped for a collection cycle, and each thread is
stopped for as short a time as is possible. It is possible for threads
requesting collector actions to block during a critical section on the
collector thread's part. Only threads that have directly or indirectly
performed an [NSThread self] operation are subject to garbage
collection.
The collector is generational (see “Write Barriers”)—most collections
are very fast and recover significant amounts of recently-allocated
memory, but not all possible memory. Full collections are also fast
and do collect all possible memory, but are run less frequently, at
times unlikely to impact user event processing, and may be aborted in
the presence of new user events.
<http://developer.apple.com/documentation/Cocoa/Conceptual/GarbageCollection/Articles/gcArchitecture.html
>
mmalc
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