public void run() {
long wakeTime = randomDelay();
System.out.println(
"** "
+ name
+ ": Sleeping for "
+ wakeTime
+ " (i.e., until time="
+ (wakeTime + Machine.timer().getTime())
+ ")");
ThreadedKernel.alarm.waitUntil(wakeTime);
System.out.println(name + " is Done Sleeping (time=" + Machine.timer().getTime() + ")");
}
/**
* Allocate a new Alarm. Set the machine's timer interrupt handler to this alarm's callback.
*
* <p><b>Note</b>: Nachos will not function correctly with more than one alarm.
*/
public Alarm() {
Machine.timer()
.setInterruptHandler(
new Runnable() {
public void run() {
timerInterrupt();
}
});
}
public void run() {
for (int i = 0; i < 5; i++) {
System.out.println(
"*** thread " + which + " looped " + i + " times, Tick:" + Machine.timer().getTime());
if ((which == 1) && (i == 0)) ThreadedKernel.alarm.waitUntil(1000);
if ((which == 1) && (i == 1)) dos.join();
if ((which == 0) && (i == 2)) dos.join();
if ((which == 2) && (i == 3)) tres.join();
if ((which == 1) && (i == 3)) dos.join();
currentThread.yield();
}
}
/**
* Put the current thread to sleep for at least <i>x</i> ticks, waking it up in the timer
* interrupt handler. The thread must be woken up (placed in the scheduler ready set) during the
* first timer interrupt where
*
* <p>
*
* <blockquote>
*
* (current time) >= (WaitUntil called time)+(x)
*
* </blockquote>
*
* @param x the minimum number of clock ticks to wait.
* @see nachos.machine.Timer#getTime()
*/
public void waitUntil(long x) {
// disable interrupts
Machine.interrupt().disable(); // let's see if this works? DAC DEBUG
// calculate wakeTime
long wakeTime = Machine.timer().getTime() + x;
// create AlarmBucket
AlarmBucket Abuck = new AlarmBucket(wakeTime, KThread.currentThread());
// add current thread (alarm bucket) to waitQueue
waitQueue.add(Abuck);
// put current thread to sleep
KThread.currentThread().sleep();
return;
}
/**
* run() method for the RVThread. This method loops howMany times. During this loop the thread
* waits some random amount of time, then speaks or listen, depending on whether this.isSpeaker
* is sets to true or false.
*/
public void run() {
System.out.println("** " + name + " begins.");
/* Main loop */
for (int i = 0; i < howMany; i++) {
/* Sleep for some random delay */
int randomDelay = randomDelay();
System.out.println(
"** "
+ name
+ ": Sleeping for "
+ randomDelay
+ " (i.e., until time="
+ (randomDelay + Machine.timer().getTime())
+ ")");
ThreadedKernel.alarm.waitUntil(randomDelay);
System.out.println(
"** " + name + ": Done sleeping! (time=" + Machine.timer().getTime() + ")");
if (isSpeaker) {
/* I am a speaker and I speak my word */
int randomWord = randomWord();
System.out.println(
"** "
+ name
+ ": Speaking "
+ randomWord
+ " (time="
+ Machine.timer().getTime()
+ ")");
comm.speak(randomWord);
System.out.println(
"** " + name + ": Spoke and Returned (time=" + Machine.timer().getTime() + ")");
} else {
/* I am a listener and I listen */
System.out.println("** " + name + ": Listening (time=" + Machine.timer().getTime() + ")");
int word = comm.listen();
System.out.println(
"** "
+ name
+ ": Listened and got "
+ word
+ " (time="
+ Machine.timer().getTime()
+ ")");
}
}
/* Exits and signals it to the main thread */
commFinished.speak(-1);
System.out.println("** " + name + " exits.");
}
/**
* The timer interrupt handler. This is called by the machine's timer periodically (approximately
* every 500 clock ticks). Causes the current thread to yield, forcing a context switch if there
* is another thread that should be run.
*/
public void timerInterrupt() {
// disable interrupts (maybe not necessary)
Machine.interrupt().disable(); // let's see if this works?
// get current time
long currentTime = Machine.timer().getTime();
// go through waitQueue and put each thread that is "less than" current wait time on ready queue
AlarmBucket placeholder = null;
int count = waitQueue.size();
while (count > 0) {
placeholder = waitQueue.peek();
if (placeholder.getTime() <= currentTime) {
placeholder = waitQueue.poll();
placeholder.getKThread().ready();
count = waitQueue.size();
} else {
count = 0;
}
}
// yield current thread
KThread.currentThread().yield();
// Machine.interrupt().enable(); //let's see if this works? DAC DEBUG
}
private void delay() {
long time = Machine.timer().getTime();
int amount = 1000;
ThreadedKernel.alarm.waitUntil(amount);
Lib.my_assert(Machine.timer().getTime() >= time + amount);
}
