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Thread.
cc Lab Quiz Notes Fork(Function, arg, joinP)
Allocate space in stack for
function Scheduler.cc Disable interrupts Scheduler() Admit to ready queue Enable interrupts Creates list
ReadyToRun(*thread)
Set Status of thread to READY Finish()
Add thread to list Disable interrupts FindNextToRun() ThreadToBeDestroyed = Return thread at the front of the list currentThread Remove pending interrupts Run(*nextThread) (InterruptRemove) CheckOverflow ScheduleTimerInterrupt() Change status of new thread to RUNNING Sleep() SWITCH(oldThread, nextThread) Yield() Terminate previous thread if applicable Disable Interrupts FindNextToRun() Sleep() If Ready queue is not empty Make sure interrupts are disabled o Add current thread to Ready Set status of thread to BLOCKED queue While ready queue is empty -> o Run the next thread Idle Enable interrupts Run the next thread TimerExpired()/ TimeOfNextInterrupt() ScheduleTimerInterruot() Return 40 (TimerTicks) Schedule a new interrupt
InterruptRemove() ChangeLevel () Remove pending interrupts Enable/Disable Interrupts from the pending list
SetLevel ()
Enable/Disbale Interrupts OneTick()
If Enabled -> OneTick() Advance simulated time Disable interrupts CheckIfDue(advanceClock) Check for pending interrupts Disable Interrupts CheckIfDue() o If advance Clock … Enable Interrupts If YieldOnReturn o Switch to SystemMode o Yield current thread o Switch back to old Mode
