Interrupt Class Reference

#include <interrupt.h>

List of all members.

Public Member Functions
	Interrupt ()
	~Interrupt ()
IntStatus	SetLevel (IntStatus level)
void	Enable ()
IntStatus	getLevel ()
void	Idle ()
void	Halt ()
void	YieldOnReturn ()
MachineStatus	getStatus ()
void	setStatus (MachineStatus st)
void	DumpState ()
void	Schedule (VoidFunctionPtr handler, int arg, int when, IntType type)
void	OneTick ()
Public Attributes
IntStatus	level

---

Constructor & Destructor Documentation

Interrupt::Interrupt (   )

Definition at line 67 of file interrupt.cc. References FALSE, IntOff, level, and SystemMode. { level = IntOff; pending = new List(); inHandler = FALSE; yieldOnReturn = FALSE; status = SystemMode; }

Interrupt::~Interrupt (   )

Definition at line 81 of file interrupt.cc. References List::IsEmpty(), and List::Remove(). { while (!pending->IsEmpty()) delete pending->Remove(); delete pending; }

---

Member Function Documentation

void Interrupt::DumpState (   )

Definition at line 372 of file interrupt.cc. References level, List::Mapcar(), stats, and Statistics::totalTicks. Referenced by Machine::Debugger(). { printf("Time: %d, interrupts %s\n", stats->totalTicks, intLevelNames[level]); printf("Pending interrupts:\n"); fflush(stdout); pending->Mapcar(PrintPending); printf("End of pending interrupts\n"); fflush(stdout); }

void Interrupt::Enable (   )

Definition at line 149 of file interrupt.cc. References IntOn, and SetLevel(). Referenced by Initialize(), and schedule(). { (void) SetLevel(IntOn); }

IntStatus Interrupt::getLevel (   )  [inline]

Definition at line 86 of file interrupt.h. References IntStatus. {return level;}// Return whether interrupts

MachineStatus Interrupt::getStatus (   )  [inline]

Definition at line 98 of file interrupt.h. References MachineStatus. Referenced by PollFile(). { return status; } // idle, kernel, user

void Interrupt::Halt (   )

Definition at line 255 of file interrupt.cc. References Cleanup(), Statistics::Print(), and stats. Referenced by Idle(), and main(). { printf("Machine halting!\n\n"); stats->Print(); Cleanup(); // Never returns. }

void Interrupt::Idle (   )

Definition at line 225 of file interrupt.cc. References DEBUG(), FALSE, Halt(), IdleMode, SystemMode, and TRUE. Referenced by Thread::Suspend(). { DEBUG('i', "Machine idling; checking for interrupts.\n"); status = IdleMode; if (CheckIfDue(TRUE)) { // check for any pending interrupts while (CheckIfDue(FALSE)) // check for any other pending ; // interrupts yieldOnReturn = FALSE; // since there's nothing in the // ready queue, the yield is automatic status = SystemMode; return; // return in case there's now // a runnable thread } // if there are no pending interrupts, and nothing is on the ready // queue, it is time to stop. If the console or the network is // operating, there are *always* pending interrupts, so this code // is not reached. Instead, the halt must be invoked by the user program. DEBUG('i', "Machine idle. No interrupts to do.\n"); printf("No threads ready or runnable, and no pending interrupts.\n"); printf("Assuming the program completed.\n"); Halt(); }

void Interrupt::OneTick (   )

Definition at line 163 of file interrupt.cc. References currentThread, DEBUG(), FALSE, IntOff, IntOn, MachineStatus, stats, SystemMode, SystemTick, Statistics::systemTicks, Statistics::totalTicks, UserTick, Statistics::userTicks, and Thread::Yield(). Referenced by Machine::Run(), and SetLevel(). { MachineStatus old = status; // advance simulated time if (status == SystemMode) { stats->totalTicks += SystemTick; stats->systemTicks += SystemTick; } else { // USER_PROGRAM stats->totalTicks += UserTick; stats->userTicks += UserTick; } DEBUG('i', "\n== Tick %d ==\n", stats->totalTicks); // check any pending interrupts are now ready to fire ChangeLevel(IntOn, IntOff); // first, turn off interrupts // (interrupt handlers run with // interrupts disabled) while (CheckIfDue(FALSE)) // check for pending interrupts ; ChangeLevel(IntOff, IntOn); // re-enable interrupts if (yieldOnReturn) { // if the timer device handler asked // for a context switch, ok to do it now yieldOnReturn = FALSE; status = SystemMode; // yield is a kernel routine currentThread->Yield(); status = old; } }

void Interrupt::Schedule (  VoidFunctionPtr  handler, int  arg, int  when, IntType  type )

Definition at line 278 of file interrupt.cc. References ASSERT, DEBUG(), List::SortedInsert(), stats, Statistics::totalTicks, and VoidFunctionPtr. Referenced by Console::CheckCharAvail(), Network::CheckPktAvail(), Console::Console(), Network::Network(), Console::PutChar(), Disk::ReadRequest(), Network::Send(), Timer::Timer(), Timer::TimerExpired(), and Disk::WriteRequest(). { int when = stats->totalTicks + fromNow; PendingInterrupt *toOccur = new PendingInterrupt(handler, arg, when, type); DEBUG('i', "Scheduling interrupt handler the %s at time = %d\n", intTypeNames[type], when); ASSERT(fromNow > 0); pending->SortedInsert(toOccur, when); }

IntStatus Interrupt::SetLevel (  IntStatus  level  )

Definition at line 119 of file interrupt.cc. References ASSERT, FALSE, IntOff, IntOn, IntStatus, level, OneTick(), and timer_mask. Referenced by Enable(), Thread::Finish(), Thread::Fork(), Semaphore::P(), Thread::Sleep(), Thread::UnSleep(), Semaphore::V(), and Thread::Yield(). { IntStatus old = level; ASSERT((now == IntOff) || (inHandler == FALSE));// interrupt handlers are // prohibited from enabling // interrupts if (now == IntOff) { sigprocmask(SIG_BLOCK, &timer_mask, 0); } else { sigprocmask(SIG_UNBLOCK, &timer_mask, 0); } ChangeLevel(old, now); // change to new state if ((now == IntOn) && (old == IntOff)) OneTick(); // advance simulated time return old; }

void Interrupt::setStatus (  MachineStatus  st  )  [inline]

Definition at line 99 of file interrupt.h. Referenced by Machine::RaiseException(), and Machine::Run(). { status = st; }

void Interrupt::YieldOnReturn (   )

Definition at line 208 of file interrupt.cc. References TRUE. Referenced by Scheduler::timerIntH(). { //ASSERT(inHandler == TRUE); yieldOnReturn = TRUE; }

---

Member Data Documentation

IntStatus Interrupt::level

Definition at line 116 of file interrupt.h. Referenced by DumpState(), Interrupt(), SetLevel(), and Scheduler::timerIntH().

---

The documentation for this class was generated from the following files:

• interrupt.h
• interrupt.cc

---