protected final void releaseAllLocks(Component host_) {
String old_ = state;
setState(State_UNLOCKING);
for (LockPack p_ = (LockPack) host_.locks; p_ != null; p_ = p_.next)
if (p_.holder == this) {
// unlock(host_, p_.target, true);
// below is copied from unlock()
synchronized (p_) {
p_.holder = null;
p_.counter = -1;
// p_.counter is not zero, see Note 1 above
if (p_.lockReqCount == 0) {
continue;
}
p_.lockReqCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else aruntime.newTask(Task.createNotify(p_), this);
}
}
}
setState(old_);
}
// Notifies all the threads waiting on the object.
protected final void notifyAll(Component host_, Object o_) {
if (o_ == null) return;
String old_ = state;
setState(State_NOTIFYING);
// sleepOn = o_;
LockPack p_ = lookforLock(host_, o_);
synchronized (o_) {
// setState(State_NOTIFYING2);
// sleepOn = null;
if (p_.waitCount == 0) return;
// runtime._notifyMany(o_, p_.waitCount, this);
synchronized (aruntime) {
if (aruntime.getWorkforce(p_.waitCount)) {
o_.notifyAll(); // dont know who's going to wake up
aruntime.nthreadsWaiting -= p_.waitCount;
} else {
int remainingWorkforce_ = aruntime.getRemainingWorkforce();
// notify "remainingWorkforce_" threads
for (int i = 0; i < remainingWorkforce_; i++) o_.notify();
aruntime.nthreadsWaiting -= remainingWorkforce_;
for (int i = p_.waitCount - remainingWorkforce_; i > 0; i--)
aruntime.newTask(Task.createNotify(o_), this);
}
}
p_.waitCount = 0;
}
setState(old_);
}
protected void unlock(Component host_, Object o_, boolean release_) {
LockPack p_ = lookforLock(host_, o_);
String old_ = state;
setState(State_UNLOCKING);
synchronized (p_) {
if (release_ || --p_.counter < 0) p_.counter = 0;
if (p_.counter == 0) {
if (p_.lockReqCount == 0) {
p_.holder = null;
return;
}
// Note 1:
// what if another thread grabs the lock before
// the one being notified below?
// p_.counter is not zero so other threads cannot just grab it
p_.lockReqCount--;
p_.counter = -1;
p_.holder = null;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else {
aruntime.newTask(Task.createNotify(p_), this);
}
}
// ---
}
}
setState(old_);
}
// Make thread wait on the object until being notified by another thread.
protected final void wait(Component host_, Object o_) {
// if (nextTask != null) _semanticsError("wait(Object)");
// looking for LockPack in host
LockPack p_ = lookforLock(host_, o_);
String old_ = state;
setState(State_WAITING);
synchronized (o_) {
// Records the status if the thread holds the lock.
if (waitPack == null) waitPack = new WaitPack();
waitPack.target = p_.target;
if (p_.holder == this) {
waitPack.counter = p_.counter;
// unlock(host_, o_, true/* release all grabs */);
// below is copied from unlock()
synchronized (p_) {
p_.holder = null;
if (p_.lockReqCount == 0) p_.counter = 0;
else {
p_.counter = -1;
// p_.counter is not zero, see Note 1 above
p_.lockReqCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else aruntime.newTask(Task.createNotify(p_), this);
}
}
}
}
p_.waitCount++;
// waited to be notified
_sleepOn(o_, State_WAITING, null);
if (isOrphan()) throw new WorkerThreadInterruptedException("Orphan thread");
// _awakened();
// re-grabbing the lock if necessary.
if (waitPack.counter > 0) {
synchronized (p_) {
if (p_.holder != null) lock(host_, p_.target);
else {
p_.holder = this;
p_.counter = waitPack.counter;
}
}
}
}
if (p_ != null) {
waitPack.counter = 0;
waitPack.target = null;
}
}
/**
* Returns the thread that is holding the lock of the target object. The returned thread may be an
* orphan thread from previous run. final WorkerThread getHolder(Object o_) { Component host_ =
* getHost(); if (host_ == null) return null; LockPack p_ = lookforLock(host_, o_); return p_ ==
* null? null: p_.holder; }
*/
protected void yieldToRuntime() {
synchronized (this) { // avoid racing with runtime.stop()
if (aruntime.isSuspend())
// go into sleep if runtime is suspended
__sleepOn(this, State_PREACTIVE, state);
else if (runtime.resetting) throw new WorkerThreadInterruptedException();
aruntime.newTask(Task.createNotify(this), this);
_sleepOn(this, State_YIELD, null);
}
}
// Notifies the first thread waiting on the object.
protected final void notify(Component host_, Object o_) {
if (o_ == null) return;
String old_ = state;
setState(State_NOTIFYING);
// sleepOn = o_;
LockPack p_ = lookforLock(host_, o_);
synchronized (o_) {
// setState(State_NOTIFYING2);
// sleepOn = null;
if (p_.waitCount == 0) return;
p_.waitCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
o_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else {
aruntime.newTask(Task.createNotify(o_), this);
}
}
}
setState(old_);
}
public String _toString() {
if (runtime == null) return StringUtil.lastSubstring(super.toString(), ".") + "," + "<orphan>";
else
return StringUtil.lastSubstring(super.toString(), ".")
+ "--"
+ state
+ (sleepOn == null || sleepOn == this
? ""
: " on "
+ sleepOn
+ (waitPack != null && waitPack.target != null ? "(waiting/locking)" : ""))
+ (state == State_SLEEPING ? " until " + wakeUpTime : "")
+ "--"
+ "context="
+ mainContext()
+ "--"
+ "next_task="
+ (nextTask != null ? nextTask.toString() : "<null>")
+ "--"
+ (currentContext == mainContext ? "" : "--currentContext=" + _currentContext())
+ (returnPort == null ? "" : "--return_port=" + returnPort)
+ (sendingPort == null ? "" : "--sending_port=" + sendingPort);
}
public String info(String prefix_) {
if (runtime == null)
return StringUtil.lastSubstring(prefix_ + super.toString(), ".") + "," + "<orphan>";
StringBuffer sb_ =
new StringBuffer(
prefix_
+ StringUtil.lastSubstring(super.toString(), ".")
+ ", "
+ state
+ (sleepOn == null || sleepOn == this
? ""
: " on "
+ sleepOn
+ (waitPack != null && waitPack.target != null ? "(waiting/locking)" : ""))
+ (state == State_SLEEPING ? " until " + wakeUpTime : "")
+ "\n"
+ prefix_
+ "Context="
+ mainContext()
+ (mainContext == null ? ", " : "\n" + prefix_)
+ "Next_Task="
+ (nextTask != null ? nextTask.toString() : "<null>")
+ "\n");
if (currentContext != mainContext)
sb_.append(prefix_ + "CurrentContext: " + _currentContext() + "\n");
if (returnPort != null) sb_.append(prefix_ + "return_port: " + returnPort + "\n");
if (sendingPort != null) sb_.append(prefix_ + "sending_port: " + sendingPort + "\n");
sb_.append(prefix_ + "Locks: " + locks());
sb_.append(prefix_ + "#arrivals: " + totalNumEvents + "\n");
sb_.append(prefix_ + "last_sleepOn: " + lastsleepon + "\n");
sb_.append(
prefix_
+ "last_wkUp_thread: "
+ (lastwakeupthread == null ? null : currentThread(lastwakeupthread))
+ "\n");
return sb_.toString();
}
/** @see ARuntime */
public class AWorkerThread extends WorkerThread {
static boolean RECYCLING = true; // thread recycling?
static final Task DUMMY_CONTEXT = Task.createNotify("DUMMY_TASK");
// used in run()
static final Task REQUEST_WAITING = Task.createNotify("REQUEST_WAITING");
// used in _sleepUntil()
static final Task GETTING_TASK = Task.createNotify("Getting_Task");
static final Object SEND_RCV_REQUEST = Port.SEND_RCV_REQUEST;
/** The worker runtime of this thread. */
protected ARuntime aruntime;
/** The object that this thread waits on. */
protected transient Object sleepOn = null;
Task nextTask; // set if next task is available; set by runtime
double wakeUpTime = 0.0; // time to wake up, informational
WaitPack waitPack;
boolean beingWakedup = false; // for ForkManager to call wakeUp();
// for debug
// FIFOQueue stateQ = new FIFOQueue(10); // temporary
Thread lastwakeupthread = null;
Object lastsleepon = null;
public AWorkerThread() {
super();
}
public AWorkerThread(ThreadGroup group_, String name_) {
super(group_, name_);
}
public String info(String prefix_) {
if (runtime == null)
return StringUtil.lastSubstring(prefix_ + super.toString(), ".") + "," + "<orphan>";
StringBuffer sb_ =
new StringBuffer(
prefix_
+ StringUtil.lastSubstring(super.toString(), ".")
+ ", "
+ state
+ (sleepOn == null || sleepOn == this
? ""
: " on "
+ sleepOn
+ (waitPack != null && waitPack.target != null ? "(waiting/locking)" : ""))
+ (state == State_SLEEPING ? " until " + wakeUpTime : "")
+ "\n"
+ prefix_
+ "Context="
+ mainContext()
+ (mainContext == null ? ", " : "\n" + prefix_)
+ "Next_Task="
+ (nextTask != null ? nextTask.toString() : "<null>")
+ "\n");
if (currentContext != mainContext)
sb_.append(prefix_ + "CurrentContext: " + _currentContext() + "\n");
if (returnPort != null) sb_.append(prefix_ + "return_port: " + returnPort + "\n");
if (sendingPort != null) sb_.append(prefix_ + "sending_port: " + sendingPort + "\n");
sb_.append(prefix_ + "Locks: " + locks());
sb_.append(prefix_ + "#arrivals: " + totalNumEvents + "\n");
sb_.append(prefix_ + "last_sleepOn: " + lastsleepon + "\n");
sb_.append(
prefix_
+ "last_wkUp_thread: "
+ (lastwakeupthread == null ? null : currentThread(lastwakeupthread))
+ "\n");
return sb_.toString();
}
private String currentThread(Thread t_) {
if (t_ == null) t_ = Thread.currentThread();
return t_.toString();
}
public String _toString() {
if (runtime == null) return StringUtil.lastSubstring(super.toString(), ".") + "," + "<orphan>";
else
return StringUtil.lastSubstring(super.toString(), ".")
+ "--"
+ state
+ (sleepOn == null || sleepOn == this
? ""
: " on "
+ sleepOn
+ (waitPack != null && waitPack.target != null ? "(waiting/locking)" : ""))
+ (state == State_SLEEPING ? " until " + wakeUpTime : "")
+ "--"
+ "context="
+ mainContext()
+ "--"
+ "next_task="
+ (nextTask != null ? nextTask.toString() : "<null>")
+ "--"
+ (currentContext == mainContext ? "" : "--currentContext=" + _currentContext())
+ (returnPort == null ? "" : "--return_port=" + returnPort)
+ (sendingPort == null ? "" : "--sending_port=" + sendingPort);
}
String mainContext() {
if (mainContext == null) return "<null>";
return (mainContext.port != null ? mainContext.port + "," : "")
+ (mainContext.data != null ? mainContext.data.toString() : "<null>")
+ (returnPort == null ? "" : ",return_port:" + returnPort)
+ (sendingPort == null ? "" : ",sending_port:" + sendingPort);
}
/** Delay the starting until the time specified later(second). */
public void start() {
// if (port != null) System.out.println(this + " starts: " + data);
// runtime.startRegister(this);
if (aruntime.isSuspend()) return;
if (isAlive()) {
// __wakeUp();
synchronized (this) {
lastsleepon = this;
lastwakeupthread = Thread.currentThread();
try {
this.notify();
} catch (Exception e_) {
drcl.Debug.error(this, "start()| " + e_, false);
}
}
} else {
// the thread is newly created
setState(State_INACTIVE);
super.start();
}
}
final void setWakeupTime(double time_) {
wakeUpTime = time_;
}
final double getWakeupTime() {
return wakeUpTime;
}
/** */
protected final void __sleepOn(Object sleepOn_, String prestate_, String poststate_) {
sleepOn = sleepOn_;
if (prestate_ != null) {
if (poststate_ == null) poststate_ = state;
setState(prestate_);
}
synchronized (sleepOn) {
try {
sleepOn.wait();
} catch (InterruptedException e_) { // worker runtime is being reset
throw new WorkerThreadInterruptedException();
}
}
if (poststate_ != null) setState(poststate_);
sleepOn = null;
}
/** Standard Thread.run(). */
public /*final*/ void run() {
if (Thread.currentThread() != this) {
throw new WorkerThreadException(
"not run() by the owning thread. Current thread:"
+ Thread.currentThread()
+ "---owning thread:"
+ this);
}
try {
if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
aruntime.println(ARuntime.Debug_THREAD, this, "THREAD STARTS");
for (; ; ) {
// Note:
// getTask() and recycle() must happen atomically because
// during the time after this thread cannot get more tasks
// from runtime.getTask() and before it goes to recycle() to
// return workforce, another thread may produce a new task in
// the ready queue (without this thread knowing it) and that
// thread goes to the waiting state. Due to this racing,
// the simulation could be stalled as no thread is actively
// running to execute the new task in the ready queue.
synchronized (aruntime) {
if (mainContext == null || mainContext == DUMMY_CONTEXT) {
// grab a task from worker pool
nextTask = GETTING_TASK;
// XXX: temporary for debug
nextTask = aruntime.getTask(mainContext == null);
if (nextTask != null) {
// so null wont override DUMMY_CONTEXT
mainContext = nextTask;
nextTask = null;
} else {
setState(State_RECYCLING);
sleepOn = this;
aruntime.recycle(this);
// return workforce in recycle()
}
}
}
if (state == State_RECYCLING) {
setState(State_INACTIVE);
// BOOKMARK1:
// At this point, other threads may assign a new task
// to this thread and start this thread, so check if
// mainContext is being assigned within
// the following synchronized claus
synchronized (this) {
if (mainContext == DUMMY_CONTEXT) mainContext = null;
if (mainContext == null) {
__sleepOn(this, State_INACTIVE, State_INACTIVE);
continue;
} else sleepOn = null;
}
}
if (runtime.resetting) {
throw new WorkerThreadInterruptedException();
} else if (aruntime.isSuspend()) {
// go into sleep if runtime is suspended
synchronized (this) {
__sleepOn(this, State_PREACTIVE, State_ACTIVE);
}
}
if (mainContext.threadGroup != null) {
if (mainContext instanceof TaskNotify) {
// mainContext is TaskNotify:
// the object to be notified on is in "data"
synchronized (mainContext.data) {
if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
aruntime.println(
ARuntime.Debug_THREAD,
this,
"EXECUTING notify:" + mainContext.data + "," + System.currentTimeMillis());
mainContext.data.notify();
aruntime.nthreadsWaiting--;
}
mainContext = null;
// workforce transfered to the waked up thread
continue;
} else if (getThreadGroup() != mainContext.threadGroup) {
aruntime.immediatelyStart(mainContext);
mainContext = null;
// workforce transfered to new thread
continue;
}
}
if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
aruntime.println(ARuntime.Debug_THREAD, this, "EXECUTING:" + mainContext);
setState(State_ACTIVE);
// runtime.runCheck(this);
String method_ = "process()";
currentContext = mainContext;
returnPort = currentContext.returnPort;
// from server port, new context
try {
mainContext.execute(this);
} catch (NullPointerException e_) {
if (runtime == null) return;
e_.printStackTrace();
drcl.Debug.error(info());
} catch (Exception e_) {
e_.printStackTrace();
drcl.Debug.error(info());
} catch (SendReceiveException e_) {
e_.printStackTrace();
drcl.Debug.error(info());
}
currentContext.port = null;
currentContext.data = null;
finishing();
mainContext = DUMMY_CONTEXT;
// to maintain the ownership of workforce
if (!RECYCLING) {
aruntime.remove(this);
break;
}
if (nextTask != null) {
// error checking
if (mainContext != null && mainContext != DUMMY_CONTEXT)
drcl.Debug.systemFatalError("task assigned to occupied thread:" + this);
mainContext = nextTask;
nextTask = null;
}
} // for(;;)
drcl.Debug.systemFatalError("Unexpected finish at " + this);
} catch (WorkerThreadInterruptedException e_) {
// if (!runtime.resetting) {
// e_.printStackTrace();
// drcl.Debug.systemFatalError(
// "AWorkerThread terminates abnormally, " + this
// + "\nManager: " + runtime.diag());
// }
// Will releaseAllLocks()/cancelAllWaits() clean up the lock
// structure in components?
// Not if the thread comes across multiple components...
if (mainContext != null && mainContext.port != null) releaseAllLocks(mainContext.port.host);
aruntime.remove(this);
} catch (NullPointerException e_) {
if (runtime != null) {
e_.printStackTrace();
drcl.Debug.error(info());
}
}
runtime = null; // become an orphan
aruntime = null;
}
//
static void ___SUBCLASS_OVERRIDES___() {}
//
void _sleepUntil(double time_, String poststate_) {
if (poststate_ == null) poststate_ = state;
setWakeupTime(time_);
// set the following two lines before calling
// runtime.threadRequestsWaiting() to avoid racing
// (see codes below)
if (sleepOn == null) sleepOn = this;
// for wait(Object, double), sleepOn is preset
synchronized (sleepOn) {
if (nextTask != null) _semanticsError("sleep()");
if (aruntime.threadRequestsSleeping(this, time_)) {
__sleepOn(sleepOn, State_SLEEPING, State_AWAKENING);
// runtime.threadAwakeFromSleeping(this);
if (aruntime.debug && aruntime.isDebugEnabledAt(aruntime.Debug_Q))
aruntime.println(
aruntime.Debug_Q, this, "awaked from finite sleep, " + _currentContext());
}
setWakeupTime(Double.NaN);
}
setState(poststate_);
}
void _sleepOn(Object sleepOn_, String prestate_, String poststate_) {
if (poststate_ == null) poststate_ = state;
sleepOn = sleepOn_;
synchronized (sleepOn) {
if (nextTask != null) _semanticsError("wait()");
aruntime.threadBecomesWaiting(this);
__sleepOn(sleepOn_, prestate_, State_AWAKENING);
// runtime.threadAwakeFromWaiting(this);
if (aruntime.debug && aruntime.isDebugEnabledAt(aruntime.Debug_Q))
aruntime.println(
aruntime.Debug_Q, this, "awaked from indefinite sleep: " + _currentContext());
}
setState(poststate_);
}
// protected void _awakened()
// {}
//
static void ___API_FOR_COMPONENT___() {}
//
protected final void sleepFor(double time_) {
// if (nextTask != null) _semanticsError("sleepFor(double)");
_sleepUntil(runtime.getTime() + time_, State_AWAKENING);
// _awakened();
setState(State_ACTIVE);
}
protected final void sleepUntil(double time_) {
// if (nextTask != null) _semanticsError("sleepUntil(double)");
_sleepUntil(time_, State_AWAKENING);
// _awakened();
setState(State_ACTIVE);
}
/** Let go of the thread from sleep in idle. */
public void kill() {
if (isAlive()) interrupt();
else aruntime.remove(this);
}
//
static void ___EVENTS___() {}
// Identify the events to make it easier to do simulation extension.
//
protected void changeCurrentContext(Port port_, Object data_, String state_) {
// mainContext = new Task(port_, data_, mainContext.type, 0.0);
if (currentContext == mainContext || currentContext == null)
currentContext = new TaskReceive(port_, data_);
else {
currentContext.data = data_;
currentContext.port = port_;
}
if (state_ != null) state = state_;
;
if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
aruntime.println(
ARuntime.Debug_THREAD,
this,
"currentContext ---> " + "state:" + state + "," + _currentContext());
}
String _currentContext() {
if (currentContext == null || currentContext.data == null && currentContext.port == null)
return "<null>";
else
return "PORT:"
+ currentContext.port
+ ",DATA:"
+ drcl.util.StringUtil.toString(currentContext.data);
}
public final boolean isReadyForNextTask() {
return (state == State_FINISHING || state == State_INACTIVE) && nextTask == null;
}
//
static void ___INFO___() {}
//
/*
public final Component getHost()
{
return currentContext == null? null:
(currentContext.port == null?
(currentContext.data instanceof Component?
(Component)currentContext.data: null):
currentContext.port.host);
}
*/
//
static void ___SYNC_APIS___() {}
//
private void _semanticsError(String method_) {
drcl.Debug.fatalError(
"Calling "
+ method_
+ " after doLastSending()/finishing() is prohibited.\n"
+ "Current_thread:"
+ this
+ "\n");
}
// String msg = "<nothing>"; // temporary
// public String msg() { return msg; } // temporary
public final String locks() {
// XXX
return "<not implemented yet>\n";
}
/*
public static class LockPack implements Component.Locks
{
public Object target;
public WorkerThread holder;
public int counter; // # of times "holder" grabs the lock of "target"
public int lockReqCount; // # of threads waiting for lock of "target"
public int waitCount; // # of threads waiting on "target"
public LockPack next;
public LockPack(Object target_)
{
target = target_;
}
public String printAll()
{
LockPack p_ = this;
StringBuffer sb_ = new StringBuffer();
while (p_ != null) {
sb_.append(" " + p_.target + ": " + p_.holder + ", count="
+ p_.counter + ", waitCount=" + p_.waitCount + "\n");
p_ = p_.next;
}
return sb_.toString();
}
public String toString()
{ return "LockPack: " + target + ", holder=" + ", " + counter
+ ", " + lockReqCount + ", " + waitCount; }
}
*/
// store counterparts in LockPack that are reset when this thread
// 'wait()' on something
class WaitPack {
Object target;
// WorkerThread next; // next thread in waiting chain
int counter;
public WaitPack() {}
}
// Looking for LockPack in host.
// Create one if necessary.
private LockPack lookforLock(Component host_, Object o_) {
LockPack p_ = null;
// if (host_.locks != null) {
// p_ = (LockPack)host_.locks;
// while (p_ != null && p_.target != o_) p_ = p_.next;
// }
// if (p_ == null) {
// First time the object is locked.
// Search again in the synchronized claus to avoid racing.
// Create one if it is still not there.
synchronized (host_) {
if (host_.locks != null) {
p_ = (LockPack) host_.locks;
while (p_ != null && p_.target != o_) p_ = p_.next;
}
if (p_ == null) {
p_ = new LockPack(o_);
p_.next = (LockPack) host_.locks;
host_.locks = p_;
}
}
// }
return p_;
}
protected final void lock(Component host_, Object o_) {
// looking for LockPack in host
LockPack p_ = lookforLock(host_, o_);
// No need to grab p_'s monitor if thread is already the lock holder.
if (p_.holder == this) {
p_.counter++;
return;
}
String old_ = state;
synchronized (p_) {
// the lock holder may be an orphan from previous run
// if (p_.holder == null || p_.holder.isOrphan()) {
if (p_.counter == 0 || (p_.holder != null && p_.holder.isOrphan())) {
// thread becomes the lock holder
p_.holder = this;
p_.counter = 1;
return;
}
// if (nextTask != null) _semanticsError("lock(Object)");
// Else:
// 1. add thread itself to the waiting queue;
// 2. going into sleep;
// 3. getting the lock after awake;
// p_.qWaiting.enqueue(this);
p_.lockReqCount++;
if (waitPack == null) waitPack = new WaitPack();
waitPack.target = p_.target; // for debugging only
_sleepOn(p_, State_LOCKING, null); // wait for lock
waitPack.target = null;
// p_.qWaiting.remove(this);
if (isOrphan()) {
p_.notify();
return;
}
p_.holder = this;
p_.counter = 1;
// _awakened();
}
}
protected final void unlock(Component host_, Object o_) {
unlock(host_, o_, false);
}
protected void unlock(Component host_, Object o_, boolean release_) {
LockPack p_ = lookforLock(host_, o_);
String old_ = state;
setState(State_UNLOCKING);
synchronized (p_) {
if (release_ || --p_.counter < 0) p_.counter = 0;
if (p_.counter == 0) {
if (p_.lockReqCount == 0) {
p_.holder = null;
return;
}
// Note 1:
// what if another thread grabs the lock before
// the one being notified below?
// p_.counter is not zero so other threads cannot just grab it
p_.lockReqCount--;
p_.counter = -1;
p_.holder = null;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else {
aruntime.newTask(Task.createNotify(p_), this);
}
}
// ---
}
}
setState(old_);
}
protected final void releaseAllLocks(Component host_) {
String old_ = state;
setState(State_UNLOCKING);
for (LockPack p_ = (LockPack) host_.locks; p_ != null; p_ = p_.next)
if (p_.holder == this) {
// unlock(host_, p_.target, true);
// below is copied from unlock()
synchronized (p_) {
p_.holder = null;
p_.counter = -1;
// p_.counter is not zero, see Note 1 above
if (p_.lockReqCount == 0) {
continue;
}
p_.lockReqCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else aruntime.newTask(Task.createNotify(p_), this);
}
}
}
setState(old_);
}
// Make thread wait on the object until being notified by another thread.
protected final void wait(Component host_, Object o_) {
// if (nextTask != null) _semanticsError("wait(Object)");
// looking for LockPack in host
LockPack p_ = lookforLock(host_, o_);
String old_ = state;
setState(State_WAITING);
synchronized (o_) {
// Records the status if the thread holds the lock.
if (waitPack == null) waitPack = new WaitPack();
waitPack.target = p_.target;
if (p_.holder == this) {
waitPack.counter = p_.counter;
// unlock(host_, o_, true/* release all grabs */);
// below is copied from unlock()
synchronized (p_) {
p_.holder = null;
if (p_.lockReqCount == 0) p_.counter = 0;
else {
p_.counter = -1;
// p_.counter is not zero, see Note 1 above
p_.lockReqCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
p_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else aruntime.newTask(Task.createNotify(p_), this);
}
}
}
}
p_.waitCount++;
// waited to be notified
_sleepOn(o_, State_WAITING, null);
if (isOrphan()) throw new WorkerThreadInterruptedException("Orphan thread");
// _awakened();
// re-grabbing the lock if necessary.
if (waitPack.counter > 0) {
synchronized (p_) {
if (p_.holder != null) lock(host_, p_.target);
else {
p_.holder = this;
p_.counter = waitPack.counter;
}
}
}
}
if (p_ != null) {
waitPack.counter = 0;
waitPack.target = null;
}
}
// Notifies the first thread waiting on the object.
protected final void notify(Component host_, Object o_) {
if (o_ == null) return;
String old_ = state;
setState(State_NOTIFYING);
// sleepOn = o_;
LockPack p_ = lookforLock(host_, o_);
synchronized (o_) {
// setState(State_NOTIFYING2);
// sleepOn = null;
if (p_.waitCount == 0) return;
p_.waitCount--;
synchronized (aruntime) {
if (aruntime.getWorkforce()) {
o_.notify(); // dont know who's going to wake up
aruntime.nthreadsWaiting--;
} else {
aruntime.newTask(Task.createNotify(o_), this);
}
}
}
setState(old_);
}
// Notifies all the threads waiting on the object.
protected final void notifyAll(Component host_, Object o_) {
if (o_ == null) return;
String old_ = state;
setState(State_NOTIFYING);
// sleepOn = o_;
LockPack p_ = lookforLock(host_, o_);
synchronized (o_) {
// setState(State_NOTIFYING2);
// sleepOn = null;
if (p_.waitCount == 0) return;
// runtime._notifyMany(o_, p_.waitCount, this);
synchronized (aruntime) {
if (aruntime.getWorkforce(p_.waitCount)) {
o_.notifyAll(); // dont know who's going to wake up
aruntime.nthreadsWaiting -= p_.waitCount;
} else {
int remainingWorkforce_ = aruntime.getRemainingWorkforce();
// notify "remainingWorkforce_" threads
for (int i = 0; i < remainingWorkforce_; i++) o_.notify();
aruntime.nthreadsWaiting -= remainingWorkforce_;
for (int i = p_.waitCount - remainingWorkforce_; i > 0; i--)
aruntime.newTask(Task.createNotify(o_), this);
}
}
p_.waitCount = 0;
}
setState(old_);
}
/**
* Returns the thread that is holding the lock of the target object. The returned thread may be an
* orphan thread from previous run. final WorkerThread getHolder(Object o_) { Component host_ =
* getHost(); if (host_ == null) return null; LockPack p_ = lookforLock(host_, o_); return p_ ==
* null? null: p_.holder; }
*/
protected void yieldToRuntime() {
synchronized (this) { // avoid racing with runtime.stop()
if (aruntime.isSuspend())
// go into sleep if runtime is suspended
__sleepOn(this, State_PREACTIVE, state);
else if (runtime.resetting) throw new WorkerThreadInterruptedException();
aruntime.newTask(Task.createNotify(this), this);
_sleepOn(this, State_YIELD, null);
}
}
//
static void ___STATE___() {}
//
protected final void setState(String new_) {
if (state == new_) return;
if (aruntime.debug) aruntime.threadStateChange(this, state, new_);
// if (stateQ.isFull()) stateQ.dequeue(); // temporary
// stateQ.enqueue(state); // temporary
state = new_;
}
// for ARuntime to stop()
final boolean isActive() {
return !(state == State_INACTIVE
|| state == State_SLEEPING
|| state == State_PREACTIVE
|| state == State_AWAKENING_WAITING
|| state == State_LOCKING
|| state == State_WAITING
|| state == State_YIELD);
}
// for ARuntime to resume()
final boolean isInActive() {
return state == State_INACTIVE || state == State_PREACTIVE;
}
// XX: Transient states, for debugging purpose.
/** State of acquiring a lock. */
static final String State_LOCKING = "LOCKING";
// state of performing recycling tasks before runtime.recycle()
static final String State_RECYCLING = "RECYCLING";
// state of sleep before active due to suspended runtime
static final String State_PREACTIVE = "PREACTIVE";
// state of being awakened, but waiting for available workforce.
static final String State_AWAKENING_WAITING = "AWAKENING-WAITING";
// state of notifying on an object
static final String State_NOTIFYING = "NOTIFYING(debug)";
static final String State_NOTIFYING2 = "NOTIFYING2(debug)";
// state of being awakened, re-grabbing workforce.
static final String State_AWAKENING = "AWAKENING";
// state of releasing a lock
static final String State_UNLOCKING = "UNLOCKING(debug)";
// state of yielding to other threads
static final String State_YIELD = "YIELD(debug)";
}
/** Invoked when the user presses the start button. */
public void actionPerformed(ActionEvent evt) {
if (evt.getActionCommand().equals("start")) {
StartButton.setEnabled(false);
cancelButton.setEnabled(true);
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
// Instances of javax.swing.SwingWorker are not reusuable, so
// we create new instances as needed.
DownloadMessage theMessage =
new DownloadMessage() {
public void setProgress(int Progress) {
if (myState.equals("SPLIT")) {
progressBar.setValue(Progress);
} else if (myState.equals("DOWNLOADREMOTE")) {
progressBar.setValue(Progress);
} else if (myState.equals("DOWNLOADLOCALBASE")) {
progressBar3.setValue(Progress);
} else if (myState.equals("TOTAL")) {
progressBar4.setValue(Progress);
progressBar3.setValue(0);
progressBar2.setValue(0);
progressBar.setValue(0);
}
}
public void messageChanged(int Progress, String message) {
setProgress(Progress);
taskOutput.append(message + "\n");
taskOutput.setCaretPosition(taskOutput.getDocument().getLength());
// TODO Auto-generated method stub
}
public void stateChanged(String theState) {
myState = theState;
// TODO Auto-generated method stub
}
public void messageChanged(String theMessage) {
taskOutput.append(theMessage + "\n");
taskOutput.setCaretPosition(taskOutput.getDocument().getLength());
// TODO Auto-generated method stub
// TODO Auto-generated method stub
}
};
task = new Task(theMessage, (String) myDownloadOptions.getSelectedItem());
task.addPropertyChangeListener(this);
task.execute();
} else if (evt.getActionCommand().equals("cancel")) {
task.cancel(false);
// startButton.setEnabled(true);
// cancelButton.setEnabled(false);
}
}