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[Mirror] Some kind of OS: git://git.9front.org/plan9front/plan9front
eaffa1ef55
Move the "double-ready" check into queueproc() function, doing it while holding the runq lock, meaning all transitions to Ready state are serialized. We do not just check for double-ready but for any "illegal" transisions: ready() on Dead, Moribund, New, Ready, Running and Waitrelease is not allowed. ready() on Queueing*, Wakeme, Broken, Stopped and Rendez is only valid when done from another process. For rescheduling, we have to go to Scheding state before calling ready(). (rebalance(), schedinit()...) The EDF scheduler had this bug where it could ready() multiple times as it was staying in Waitrelease state after releasing the edflock. Now it transitions thru Scheding avoiding the issue. |
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