C++ ProcessId::getCPU方法代码示例

Pid_t OSSim::contextSwitch(CPU_t cpu, Pid_t nPid)
{
    // This is the process we displaced to run the target process
    Pid_t oldPid=-1;
    ProcessId *newProc = ProcessId::getProcessId(nPid);
    I(newProc);
    GProcessor *newCore=cpus.getProcessor(cpu);
    I(newCore);
    // Get the cpu where the target process is already running
    CPU_t runCpu=(newProc->getState()==RunningState)?newProc->getCPU():-1;
    // If already running on the target processor, do nothing
    if(runCpu==cpu)
        return -1;
    // If target core has no available flows, make one
    if(!newCore->availableFlows()) {
        oldPid=newCore->findVictimPid();
        ProcessId *oldProc=ProcessId::getProcessId(oldPid);
        cpus.switchOut(cpu, oldProc);
    }
    // Is the target process already running on another cpu?
    if(runCpu!=-1) {
        // Get another process to run on original cpu
        ProcessId *repProc=ProcessId::queueGet(runCpu);
        // Get the target process out of old core
        cpus.switchOut(runCpu, newProc);
        // Get the replacement process (if any) into the old core
        if(repProc)
            cpus.switchIn(runCpu,repProc);
        // Get the target process in the target cpu
        cpus.switchIn(cpu, newProc);
    } else {
        // If new process not ready, make it ready
        if(newProc->getState()!=ReadyState) {
            // Make it prefer the target cpu
            newProc->setCPU(cpu);
            // Make it ready
            newProc->setState(InvalidState);
            cpus.makeRunnable(newProc);
            // The target cpu is prefered by the target process, and
            // the target cpu has available flows. Thus, the target
            // process should be now running on the target cpu
            I(newProc->getCPU()==cpu);
            I(newProc->getState()==RunningState);
        } else {
            // The new process is already ready, just switch it in
            cpus.switchIn(cpu,newProc);
        }
    }
    return oldPid;
}

int32_t OSSim::eventYield(Pid_t curPid, Pid_t yieldPid)
{
    //  LOG("OSSim::yield(%d,%d)", curPid, yieldPid);
    ProcessId  *curProc=ProcessId::getProcessId(curPid);
    // The current process should be running
    I(curProc->getState()==RunningState);
    // get the CPU where the current process is running
    CPU_t cpu=curProc->getCPU();
    // Get the ProcessId of the new process
    ProcessId *yieldProc;
    if(yieldPid<0) {
        // No specific new process, get next ready process
        yieldProc=ProcessId::queueGet(cpu);
    } else {
        // Specific ready process, get its ProcessId
        yieldProc=ProcessId::getProcessId(yieldPid);
        // there should be such a process
        if(!yieldProc) {
            LOG("OSSim::yield(%d) to non existing process???", yieldPid);
            return 0;
        }
    }
    // Do nothing if no process to yield to
    if(!yieldProc)
        return 1;
    // Do nothing if the new process already running
    if(yieldProc->getState()==RunningState)
        return 1;
    // The new process should not be suspended
    if(yieldProc->getState()==SuspendedState) {
        LOG("OSSim::yield(%d) to a suspended process???", yieldPid);
        return 0;
    }
    // The new process should not be pinned to a other processor
    if(yieldProc->isPinned()&&(yieldProc->getCPU()!=cpu)) {
        LOG("OSSim::yield(%d) to a NOMIGRABLE process in another CPU", yieldPid);
        return 0;
    }
    // Remove current process from the processor
    cpus.switchOut(cpu,curProc);
    // Put the new process on that processor
    cpus.switchIn(cpu,yieldProc);
    return 1;
}

void OSSim::setPriority(Pid_t pid, int32_t newPrio)
{
    ProcessId *proc = ProcessId::getProcessId(pid);
    I(proc);

    int32_t oldPrio=proc->getPriority();

    if(newPrio==oldPrio)
        return;

    // Set the new priority of the process
    ProcessId *otherProc=proc->setPriority(newPrio);
    if(newPrio>oldPrio) {
        // Priority is better now, check if still running
        if(proc->getState()==RunningState) {
            // Is there a process we need to swap with
            if(otherProc) {
                // Get the cpu where the demoted process is running
                CPU_t cpu=proc->getCPU();
                // Switch the demoted process out
                cpus.switchOut(cpu,proc);
                // Switch the new process in
                cpus.switchIn(cpu,otherProc);
            }
        }
    } else {
        // Priority is worse now, check if ready but not already running
        if(proc->getState()==ReadyState) {
            // Is there a process we need to swap with
            if(otherProc) {
                // Get the cpu where the other process is running
                CPU_t cpu=otherProc->getCPU();
                // Switch the victim process out
                cpus.switchOut(cpu,otherProc);
                // Switch the promoted process in
                cpus.switchIn(cpu,proc);
            }
        }
    }
}