| AFAIK, the GC never runs during foreign calls. This, combine with the fact
that GHC can
| pass ByteArray# directly to FFI calls, should make memcpy safe even for
unpinned
| byte arrays. At least that's how I understand it.
Unless I am much mistaken, GC absolutely does run during *safe* foreign calls,
as do other Haskell threads and all manner of other stuff. ("Unsafe" ones are
supposed to run fast, and no gc is allowed. We think of unsafe foreign calls as
"fat machine instructions".)
Simon
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