/**
* Schedule the concurrent collector threads. If this is called from within a collection interval
* the threads must not be started until after the interval is complete.
*/
private static void scheduleConcurrentWorkers() {
concurrentWorkersLock.acquire();
if (!allowConcurrentWorkersActive) {
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(concurrentWorkersActive == 0);
allowConcurrentWorkersActive = true;
}
concurrentWorkersLock.release();
VM.collection.scheduleConcurrentWorkers();
}
/**
* Notify that the current thread believes that a concurrent collection phase is complete.
*
* @return True if this was the last thread.
*/
public static boolean completeConcurrentPhase() {
boolean result = false;
concurrentWorkersLock.acquire();
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(allowConcurrentWorkersActive);
concurrentWorkersActive--;
if (concurrentWorkersActive == 0) {
allowConcurrentWorkersActive = false;
result = true;
}
if (Options.verbose.getValue() >= 3) {
Log.write("< Concurrent worker ");
Log.write(concurrentWorkersActive);
Log.write(" completed phase ");
Log.write(getName(concurrentPhaseId));
Log.writeln(" >");
}
concurrentWorkersLock.release();
return result;
}
/** Attempt to begin execution of a concurrent collection phase. */
public static boolean startConcurrentPhase() {
boolean result = false;
concurrentWorkersLock.acquire();
if (concurrentPhaseActive()) {
if (allowConcurrentWorkersActive) {
concurrentWorkersActive++;
result = true;
}
VM.activePlan.collector().clearResetConcurrentWork();
}
if (Options.verbose.getValue() >= 2) {
if (result) {
Log.write("< Concurrent worker ");
Log.write(concurrentWorkersActive - 1);
Log.write(" started phase ");
Log.write(getName(concurrentPhaseId));
Log.writeln(" >");
} else {
Log.writeln("< worker failed in attempt to start phase >");
}
}
concurrentWorkersLock.release();
return result;
}
/** Release the lock. */
protected final void unlock() {
lock.release();
}
/** Acquire the lock. */
protected final void lock() {
lock.acquire();
}
/**
* Add to the total cumulative committed page count.
*
* @param pages The number of pages to be added.
*/
private static void addToCommitted(int pages) {
classLock.acquire();
cumulativeCommitted += pages;
classLock.release();
}