patch applied (ghc): copy_tag_nolock(): fix write ordering and add
marlowsd at gmail.com
Tue Mar 16 11:21:01 EDT 2010
Tue Mar 16 07:31:03 PDT 2010 Simon Marlow <marlowsd at gmail.com>
* copy_tag_nolock(): fix write ordering and add a write_barrier()
Fixes a rare crash in the parallel GC.
If we copy a closure non-atomically during GC, as we do for all
immutable values, then before writing the forwarding pointer we better
make sure that the closure itself is visible to other threads that
might follow the forwarding pointer. I imagine this doesn't happen
very often, but I just found one case of it: in scavenge_stack, the
RET_FUN case, after evacuating ret_fun->fun we then follow it and look
up the info pointer.
M ./rts/sm/Evac.c -2 +6
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