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);
}
}
}
}
