int32_t OSSim::eventResume(Pid_t cpid, Pid_t pid)
{
LOG("OSSim::resume(%d,%d)", cpid, pid);
ProcessId *proc = ProcessId::getProcessId(pid);
if( proc == 0 ) {
LOG("OSSim::resume(%d,%d) non existing process???", cpid, pid);
return 0;
}
// Decrement the suspend counter
proc->decSuspendedCounter();
// If process is in SuspendedState
if(proc->getState()==SuspendedState) {
// If the suspend count is not positive
if(proc->getSuspendedCounter()<=0) {
// Make the process runnable
proc->setState(InvalidState);
cpus.makeRunnable(proc);
}
return 1;
} else {
I(0);
LOG("OSSim::resume(%d,%d) OOO suspend/resume (%d)", cpid, pid, proc->getSuspendedCounter());
}
return 0;
}
int32_t OSSim::eventSuspend(Pid_t cpid, Pid_t pid)
{
LOG("OSSim::suspend(%d) Received from pid %d",pid,cpid);
ProcessId *proc = ProcessId::getProcessId(pid);
if( proc == 0 ) {
LOG("OSSim::suspend(%d) non existing process???", pid);
return 0;
}
// Increment the suspend counter
proc->incSuspendedCounter();
// Check if process already suspended
if(proc->getState()==SuspendedState) {
I(0);
LOG("OSSim::suspend(%d) already suspended (recursive=%d)"
, pid, proc->getSuspendedCounter());
return 0;
}
// The process should be ready or running
I((proc->getState()==ReadyState)||(proc->getState()==RunningState));
// Need to suspend only if suspended counter is positive
if(proc->getSuspendedCounter()>0) {
// The process is no longer runnable
cpus.makeNonRunnable(proc);
// Set the state to SuspendedState
proc->setState(SuspendedState);
} else {
I(0);
LOG("OSSim::suspend(%d,%d) OOO suspend/resume (%d)", cpid, pid, proc->getSuspendedCounter());
}
return 1;
}
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;
}
void OSSim::eventWait(Pid_t cpid)
{
// All the threads have already finished
if(cpid<0)
return;
LOG("OSSim::wait (cpid %d)", cpid);
ProcessId *proc = ProcessId::getProcessId(cpid);
if(proc->getNChilds()==0) {
// No child pending
return;
}
// Should be still running
I(proc->getState()==RunningState);
// Make it non-runnable
cpus.makeNonRunnable(proc);
// Set state to WaitingState
proc->setState(WaitingState);
}
void OSSim::tryWakeupParent(Pid_t cpid)
{
ProcessId *proc = ProcessId::getProcessId(cpid);
I(proc);
Pid_t ppid = proc->getPPid();
if (ppid < 0)
return;
ProcessId *pproc = ProcessId::getProcessId(ppid);
// Does the parent process still exist?
if(pproc == 0)
return;
if(pproc->getState()==WaitingState) {
LOG("Waiting pid(%d) is awaked (child %d call)",ppid,cpid);
pproc->setState(InvalidState);
cpus.makeRunnable(pproc);
}
}
