/** Moves this thread to the ready state and adds this to the scheduler's ready queue. */
public void ready() {
Lib.debug(dbgThread, "Ready thread: " + toString());
Lib.assertTrue(Machine.interrupt().disabled());
Lib.assertTrue(status != statusReady);
status = statusReady;
if (this != idleThread) readyQueue.waitForAccess(this);
Machine.autoGrader().readyThread(this);
}
/**
* Finish the current thread and schedule it to be destroyed when it is safe to do so. This method
* is automatically called when a thread's <tt>run</tt> method returns, but it may also be called
* directly.
*
* <p>The current thread cannot be immediately destroyed because its stack and other execution
* state are still in use. Instead, this thread will be destroyed automatically by the next thread
* to run, when it is safe to delete this thread.
*/
public static void finish() {
Lib.debug(dbgThread, "Finishing thread: " + currentThread.toString());
Machine.interrupt().disable();
Machine.autoGrader().finishingCurrentThread();
Lib.assertTrue(toBeDestroyed == null);
toBeDestroyed = currentThread;
currentThread.status = statusFinished;
sleep();
}
/**
* Create the idle thread. Whenever there are no threads ready to be run, and
* <tt>runNextThread()</tt> is called, it will run the idle thread. The idle thread must never
* block, and it will only be allowed to run when all other threads are blocked.
*
* <p>Note that <tt>ready()</tt> never adds the idle thread to the ready set.
*/
private static void createIdleThread() {
Lib.assertTrue(idleThread == null);
idleThread =
new KThread(
new Runnable() {
public void run() {
while (true) yield();
}
});
idleThread.setName("idle");
Machine.autoGrader().setIdleThread(idleThread);
idleThread.fork();
}
/**
* Prepare this thread to be run. Set <tt>status</tt> to <tt>statusRunning</tt> and check
* <tt>toBeDestroyed</tt>.
*/
protected void restoreState() {
Lib.debug(dbgThread, "Running thread: " + currentThread.toString());
Lib.assertTrue(Machine.interrupt().disabled());
Lib.assertTrue(this == currentThread);
Lib.assertTrue(tcb == TCB.currentTCB());
Machine.autoGrader().runningThread(this);
status = statusRunning;
if (toBeDestroyed != null) {
toBeDestroyed.tcb.destroy();
toBeDestroyed.tcb = null;
toBeDestroyed = null;
}
}
/**
* Finish the current thread and schedule it to be destroyed when it is safe to do so. This method
* is automatically called when a thread's <tt>run</tt> method returns, but it may also be called
* directly.
*
* <p>The current thread cannot be immediately destroyed because its stack and other execution
* state are still in use. Instead, this thread will be destroyed automatically by the next thread
* to run, when it is safe to delete this thread.
*/
public static void finish() {
Lib.debug(dbgThread, "Finishing thread: " + currentThread.toString());
// FIXME Touhid :: Wake threads that have joined the currently running
// thread
currentThread.wakeJoinedThreads();
Machine.interrupt().disable();
Machine.autoGrader().finishingCurrentThread();
Lib.assertTrue(toBeDestroyed == null);
toBeDestroyed = currentThread;
currentThread.status = statusFinished;
sleep();
}
/**
* Finish the current thread and schedule it to be destroyed when it is safe to do so. This method
* is automatically called when a thread's <tt>run</tt> method returns, but it may also be called
* directly.
*
* <p>The current thread cannot be immediately destroyed because its stack and other execution
* state are still in use. Instead, this thread will be destroyed automatically by the next thread
* to run, when it is safe to delete this thread.
*/
public static void finish() {
Lib.debug(dbgThread, "Finishing thread: " + currentThread.toString());
Machine.interrupt().disable();
Machine.autoGrader().finishingCurrentThread();
Lib.assertTrue(toBeDestroyed == null);
toBeDestroyed = currentThread;
currentThread.status = statusFinished;
// When this thread is finished, we need to reset the status of all
// waited/blocked thread to ready state.
while (!currentThread.waitedThreadList.isEmpty()) {
KThread threadToRestore = currentThread.waitedThreadList.remove(0);
threadToRestore.ready();
}
sleep();
}
/**
* Finish the current thread and schedule it to be destroyed when it is safe to do so. This method
* is automatically called when a thread's <tt>run</tt> method returns, but it may also be called
* directly.
*
* <p>The current thread cannot be immediately destroyed because its stack and other execution
* state are still in use. Instead, this thread will be destroyed automatically by the next thread
* to run, when it is safe to delete this thread.
*/
public static void finish() {
Lib.debug(dbgThread, "Finishing thread: " + currentThread.toString());
Machine.interrupt().disable();
Machine.autoGrader().finishingCurrentThread();
Lib.assertTrue(toBeDestroyed == null);
toBeDestroyed = currentThread;
currentThread.status = statusFinished;
KThread aux = null;
if (joinList.size() > 0) {
aux = joinList.getFirst();
}
if (aux != null) {
aux.ready();
joinList.removeFirst();
}
sleep();
}