> I don't follow.  Garbage collection certainly can be done in a library
> (e.g., Boehm).  GC is in my experience normally triggered by
> 
>       * Allocation --- which is a function call in C
>       * Explicit call to the `garbage collect now' entry point in the
>         standard library.  A function call in every language.
> 
> What other events canonically would trigger garbage collection, but not
> be invoked by function calls?

i should have said automatic garbage collection.

i think of it this way, the janitor doesn't insist that the factory shut
down so he can sweep.  he waits for the factory to be idle, and then
sweeps.

- erik

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