Project 3 Roadmap Scheduling SemaphoresMultilevel Feedback Scheduling struct Kernel_Thread in kthread.h current queue: int currentReadyQueue blocked state: bool blocked there are 4 run queues now: s_runQueue[MAX_QUEUE_LEVEL] in kthread.c a thread is initially in s_runQueue[0] except IDLE thread that enters at 3 when switching to MLF mode check the scenarios Find_Best() automatically pick the highest priority thread in a queue Get_Next_Runnable() will call Find_Best() for each queue until it finds a ready processMultilevel Feedback Scheduling end of quantum ? if blocked promote if has just run demote (check TODO in Timer_Interrupt_Handler() defined in timer.c) make sure your Sys_SetSchedulingPolicy() works before stuff gets complicated A thread becomes blocked in Wait().Semaphores rough guideline add two files sem.h/sem.c create a semaphore structure each has a thread queue, count, name, etc P/V semantics P decrease, block if needed V increase, never blocks section 7.4.2 in the textbook, pp 203Testing Your Code workload.exe [rr/mys] ping.exe & pong.exeGetTimeOfDay() Sys_GetTimeOfDay - trivial (return
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