The pointer held in a ForeignPtr is not managed at all by the GC. The ForeignPtr itself is a GC'd object and runs a finalizer (a function receiving a pointer) with the value it holds when it is destroyed. For example, if you allocate a C resource in one foreign call and then store its value in a foreign pointer, that externally allocated memory it points to is outside the management of the GC. Matt On Tue, Jul 30, 2013 at 9:50 AM, satvik chauhan <mystic.satvik@gmail.com>wrote:
Hi Cafe,
Is it guaranteed that the value of `ForeignPtr` will not be changed (for example due to compaction etc) by haskell garbage collector until it goes out of scope and finalizer is run.
-Satvik
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