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The goal here is to explicitly mark that a check was migrated so that we don't do it again. This will allow us to perform other actions on the target thread while still knowing that we don't want to be migrated again. The new READY bit combine with SLEEPING to form 4 possible states: SLP RDY State Description 0 0 - (reserved) 0 1 RUNNING Check is bound to current thread and running 1 0 SLEEPING Check is sleeping, not bound to a thread 1 1 MIGRATING Check is migrating to another thread Thus we set READY upon migration, and check for it before migrating, this is sufficient to prevent a second migration. To make things a bit clearer, the SLEEPING bit was switched with FASTINTER so that SLEEPING and READY are adjacent. |
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