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由 Nickolai Zeldovich 提交于get rid of __sync_synchronize in gc_begin_epoch, since a LOCK instruction acts as an mfence. useful ref: http://www.cl.cam.ac.uk/~pes20/weakmemory/cacm.pdf
1153b3c3
get rid of __sync_synchronize in gc_begin_epoch, since a LOCK instruction acts as an mfence. useful ref: http://www.cl.cam.ac.uk/~pes20/weakmemory/cacm.pdf