Re: [rvm-research] Why both insertion and deletion barrier in sync1/2 phases of on-the-fly Garbage collector are needed?

Thanks a lot for explaining. I read section 16.5, but somehow missed this important aspect.
Regards,Lokesh 

    On Wednesday, 6 July 2016 2:24 PM, "Hosking, Antony L" <[email protected]> wrote:
 
 

 Hi Lokesh,
SATB needs only deletion barrier so long as collector transitions are stop-the-world, but when on-the-fly the insertion barrier may be necessary to get across the mutator handshakes to initiate collection.  Our book has an example.  DLG, which since expressed in logic is a GC specification rather than an implementation, optionally disables the insertion barrier when not handshaking.
Cheers,
Tony


On 7 Jul 2016, at 6:03 AM, Lokesh Gidra <[email protected]> wrote:
Hi,
Given that the write barrier and object allocation are supposed to be atomic wrt. handshakes, why does an SATB based on-the-fly implementation (like the famous DLG from POPl'94 paper) need to use both, insertion and deletion barriers during sync1 and sync2 phases? Won't just using deletion barrier suffice?

Kind Regards,Lokesh------------------------------------------------------------------------------
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