Method schedule

lab8/src/6/src/kernel/program.cpp:93–136

}

void ProgramManager::schedule()
{
    bool status = interruptManager.getInterruptStatus();
    interruptManager.disableInterrupt();

    if (readyPrograms.size() == 0)
    {
        interruptManager.setInterruptStatus(status);
        return;
    }
    else
    {
        //printf("amount of ready programs: %d\n", readyPrograms.size());
    }

    if (running->status == ProgramStatus::RUNNING)
    {
        running->status = ProgramStatus::READY;
        running->ticks = running->priority * 10;
        readyPrograms.push_back(&(running->tagInGeneralList));
    }
    else if (running->status == ProgramStatus::DEAD)
    {
        // 回收线程，子进程留到父进程回收
        if(!running->pageDirectoryAddress) {
            releasePCB(running);
        }
    }

    ListItem *item = readyPrograms.front();
    PCB *next = ListItem2PCB(item, tagInGeneralList);
    PCB *cur = running;
    next->status = ProgramStatus::RUNNING;
    running = next;
    readyPrograms.pop_front();

    //printf("schedule: %x %x\n", cur, next);

    activateProgramPage(next);

    asm_switch_thread(cur, next);

    interruptManager.setInterruptStatus(status);
}

void program_exit()
{