Esempi in C++ (Cpp) per Priority::validate

Esempio n. 1

File: kernel.cpp Progetto: BitsDevelopmentTeam/bits-fonera

void Thread::setPriority(Priority pr)
{
    if(pr.validate()==false) errorHandler(INVALID_PARAMETERS);
    PauseKernelLock lock;

    Thread *current=getCurrentThread();
    //If thread is locking at least one mutex
    if(current->mutexLocked!=0)
    {   
        //savedPriority always changes, since when all mutexes are unlocked
        //setPriority() must become effective
        if(current->savedPriority==pr) return;
        current->savedPriority=pr;
        //Calculate new priority of thread, which is
        //max(savedPriority, inheritedPriority)
        Mutex *walk=current->mutexLocked;
        while(walk!=0)
        {
            if(walk->waiting.empty()==false)
                pr=std::max(pr,walk->waiting.front()->getPriority());
            walk=walk->next;
        }
    }
    
    //If old priority == desired priority, nothing to do.
    if(pr==current->getPriority()) return;
    Scheduler::PKsetPriority(current,pr);
    #ifdef SCHED_TYPE_EDF
    if(isKernelRunning()) yield(); //Another thread might have a closer deadline
    #endif //SCHED_TYPE_EDF
}