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.sat...@gmail.comwrote:
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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