On Nov 30, 2008, at 4:44 PM, William Squires wrote:
The collector provides API for this:
objc_clear_stack(OBJC_CLEAR_RESIDENT_STACK);
NSRunLoop does this automatically as it passes through each loop.
Since you are blocking the run loop, you'll have to do this for it.
Wouldn't this make your locals go >poof!<??
It clears from just below the current stack down.
Part of the issue is that the "bottom of the stack" is not necessarily
the bottom of the stack. Under certain conditions, there can be quite
a number of additional bytes in the "red zone", including references
to objects.
The collector has to conservatively scan these bytes to make sure that
nothing is pre-reaped, but this can sometimes lead to an object
sticking around longer than it should.
objc_clear_stack() clears from the first known to be unused byte of
the stack onwards, thus clearing out these phantom references.
b.bum
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