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Ytshih/hw2

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This commit is contained in:
Yi-Ting Shih
2024-11-02 07:58:12 +08:00
parent 549bc9bcdc
commit 4912fe4736
24 changed files with 752 additions and 4283 deletions
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96
code/threads/scheduler.cc
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@@ -74,13 +74,13 @@ Scheduler::ReadyToRun (Thread *thread)
Thread *
Scheduler::FindNextToRun ()
{
ASSERT(kernel->interrupt->getLevel() == IntOff);
ASSERT(kernel->interrupt->getLevel() == IntOff);
if (readyList->IsEmpty()) {
return NULL;
} else {
return readyList->RemoveFront();
}
if (readyList->IsEmpty()) {
return NULL;
} else {
return readyList->RemoveFront();
}
}
//----------------------------------------------------------------------
@@ -103,50 +103,50 @@ Scheduler::FindNextToRun ()
void
Scheduler::Run (Thread *nextThread, bool finishing)
{
Thread *oldThread = kernel->currentThread;
ASSERT(kernel->interrupt->getLevel() == IntOff);
Thread *oldThread = kernel->currentThread;
if (finishing) { // mark that we need to delete current thread
ASSERT(toBeDestroyed == NULL);
toBeDestroyed = oldThread;
}
if (oldThread->space != NULL) { // if this thread is a user program,
oldThread->SaveUserState(); // save the user's CPU registers
oldThread->space->SaveState();
}
oldThread->CheckOverflow(); // check if the old thread
// had an undetected stack overflow
ASSERT(kernel->interrupt->getLevel() == IntOff);
kernel->currentThread = nextThread; // switch to the next thread
nextThread->setStatus(RUNNING); // nextThread is now running
DEBUG(dbgThread, "Switching from: " << oldThread->getName() << " to: " << nextThread->getName());
// This is a machine-dependent assembly language routine defined
// in switch.s. You may have to think
// a bit to figure out what happens after this, both from the point
// of view of the thread and from the perspective of the "outside world".
if (finishing) { // mark that we need to delete current thread
ASSERT(toBeDestroyed == NULL);
toBeDestroyed = oldThread;
}
SWITCH(oldThread, nextThread);
if (oldThread->space != NULL) { // if this thread is a user program,
oldThread->SaveUserState(); // save the user's CPU registers
oldThread->space->SaveState();
}
// we're back, running oldThread
// interrupts are off when we return from switch!
ASSERT(kernel->interrupt->getLevel() == IntOff);
oldThread->CheckOverflow(); // check if the old thread
// had an undetected stack overflow
DEBUG(dbgThread, "Now in thread: " << oldThread->getName());
kernel->currentThread = nextThread; // switch to the next thread
nextThread->setStatus(RUNNING); // nextThread is now running
CheckToBeDestroyed(); // check if thread we were running
// before this one has finished
// and needs to be cleaned up
if (oldThread->space != NULL) { // if there is an address space
oldThread->RestoreUserState(); // to restore, do it.
oldThread->space->RestoreState();
}
DEBUG(dbgThread, "Switching from: " << oldThread->getName() << " to: " << nextThread->getName());
// This is a machine-dependent assembly language routine defined
// in switch.s. You may have to think
// a bit to figure out what happens after this, both from the point
// of view of the thread and from the perspective of the "outside world".
SWITCH(oldThread, nextThread);
// we're back, running oldThread
// interrupts are off when we return from switch!
ASSERT(kernel->interrupt->getLevel() == IntOff);
DEBUG(dbgThread, "Now in thread: " << oldThread->getName());
CheckToBeDestroyed(); // check if thread we were running
// before this one has finished
// and needs to be cleaned up
if (oldThread->space != NULL) { // if there is an address space
oldThread->RestoreUserState(); // to restore, do it.
oldThread->space->RestoreState();
}
}
//----------------------------------------------------------------------
@@ -160,10 +160,10 @@ Scheduler::Run (Thread *nextThread, bool finishing)
void
Scheduler::CheckToBeDestroyed()
{
if (toBeDestroyed != NULL) {
delete toBeDestroyed;
toBeDestroyed = NULL;
}
if (toBeDestroyed != NULL) {
delete toBeDestroyed;
toBeDestroyed = NULL;
}
}
//----------------------------------------------------------------------