static void SampleItinerary() {
// Please note that this isn't a valid solution (you can't fit
// all of them on the boat). Please also note that you may not
// have a single thread calculate a solution and then just play
// it back at the autograder -- you will be caught.
System.out.println("\n ***Everyone piles on the boat and goes to Molokai***");
bg.AdultRowToMolokai();
bg.ChildRideToMolokai();
bg.AdultRideToMolokai();
bg.ChildRideToMolokai();
}
static void AdultItinerary() {
System.out.println("--- called adult itinerary");
/* This is where you should put your solutions. Make calls
to the BoatGrader to show that it is synchronized. For
example:
bg.AdultRowToMolokai();
indicates that an adult has rowed the boat across to Molokai
*/
pilotLock.acquire();
// While the boat is not at Oahu or there are more than 2 children on Oahu,
// put the adult on Oahu thread to sleep (because we wouldn't send and adult in
// these scenarios).
while (boatLocation != 0 || numChildrenOnOahu >= 2) {
System.out.println("--- can't send an adult to Molokai right now");
adultReadyAtOahu.sleep();
}
System.out.println("--- sending an adult to Molokai");
numAdultsOnOahu--; // an adult is rowing Oahu --> Molokai, so decrement
bg.AdultRowToMolokai();
numAdultsOnMolokai++; // adult has rowed over, so increment
printState();
boatLocation = 1; // boat is now at Molokai
childReadyAtMolokai.wake(); // wake up child at Molokai since it's now their turn
pilotLock.release();
}
static void ChildItinerary() {
System.out.println("--- called child itinerary");
pilotLock.acquire();
Boolean readyToTerminate = false;
int currentLocation = 0; // current location set to Oahu
while (!isDone) {
if (currentLocation == 0) {
// If we are currently on Oahu...
while (boatLocation != 0 || numChildrenOnOahu == 1) {
System.out.println(
"--- child currently on Oahu, but the boat is not on Oahu ("
+ boatLocation
+ ") or we only have 1 child on Oahu ("
+ numChildrenOnOahu
+ ")");
// ...but the boat is not in Oahu or we only have 1 child on Oahu, then sleep.
childReadyAtOahu.sleep();
}
System.out.println("--- child currently on Oahu, ready to go");
if (numAdultsOnOahu == 0 && numChildrenOnOahu == 2) {
// ... we are ready to end the game!
System.out.println("--- ready to end the game");
readyToTerminate = true;
}
if (!hasChildPilot) {
hasChildPilot = true;
bg.ChildRowToMolokai();
printState();
currentLocation = 1; // this child are now now on Molokai
} else {
numChildrenOnOahu -= 2; // 2 kids will go Oahu --> Molokai, so decrement
bg.ChildRideToMolokai();
numChildrenOnMolokai += 2; // 2 kids have arrived on Molokai, so increment
printState();
currentLocation = 1; // this child are now now on Molokai
boatLocation = 1; // boat is now at Molokai
hasChildPilot = false;
if (readyToTerminate) {
gameEnd.acquire();
end.wake();
gameEnd.release();
childReadyAtMolokai.sleep();
} else {
System.out.println("--- child ready on Molokai");
childReadyAtMolokai.wake();
}
}
} else {
// Else, if we are currently on Molokai...
while (boatLocation != 1 || hasChildPilot) {
System.out.println(
"--- child currently on Molokai, but either the boat is not on Molokai or there's already a child pilot");
// ...but the boat is not at Molokai, then sleep.
childReadyAtMolokai.sleep();
}
// ...then send a child back to Oahu.
hasChildPilot = true;
System.out.println("--- child currently on Molokai, send one back to Oahu");
numChildrenOnMolokai--; // child is going from Molokai --> Oahu, so decrement
bg.ChildRowToOahu();
numChildrenOnOahu++; // child arrived at Oahu, so incrememt
printState();
boatLocation = 0; // boat is now at Oahu
currentLocation = 0; // child is now at Oahu
hasChildPilot = false;
if (numChildrenOnOahu >= 2) {
System.out.println("--- we now have 2 children on Oahu");
childReadyAtOahu.wake(); // let Oahu now we're ready to go
} else {
System.out.println("--- we don't enough children on Oahu so send an adult");
adultReadyAtOahu.wake();
childReadyAtOahu.sleep();
}
}
}
}