/**
* Notify that the concurrent phase has completed successfully. This must only be called by a
* single thread after it has determined that the phase has been completed successfully.
*/
public static void notifyConcurrentPhaseComplete() {
if (Options.verbose.getValue() >= 2) {
Log.write("< Concurrent phase ");
Log.write(getName(concurrentPhaseId));
Log.writeln(" complete >");
}
/* Concurrent phase is complete*/
concurrentPhaseId = 0;
/* Remove it from the stack */
popScheduledPhase();
/* Pop the next phase off the stack */
int nextScheduledPhase = getNextPhase();
if (nextScheduledPhase > 0) {
short schedule = getSchedule(nextScheduledPhase);
/* A concurrent phase, lets wake up and do it all again */
if (schedule == SCHEDULE_CONCURRENT) {
concurrentPhaseId = getPhaseId(nextScheduledPhase);
scheduleConcurrentWorkers();
return;
}
/* Push phase back on and resume atomic collection */
pushScheduledPhase(nextScheduledPhase);
VM.collection.triggerAsyncCollection(Collection.INTERNAL_PHASE_GC_TRIGGER);
}
}
/**
* Place a phase on the phase stack and begin processing.
*
* @param scheduledPhase The phase to execute
* @return True if the phase stack is exhausted.
*/
public static boolean beginNewPhaseStack(int scheduledPhase) {
int order = VM.collection.rendezvous(1001);
if (order == 1) {
pushScheduledPhase(scheduledPhase);
}
return processPhaseStack(false);
}
/**
* Pull the next scheduled phase off the stack. This may involve processing several complex phases
* and skipping placeholders, etc.
*
* @return The next phase to run, or -1 if no phases are left.
*/
private static int getNextPhase() {
boolean allowConcurrentPhase = Plan.collectionTrigger == Collection.INTERNAL_PHASE_GC_TRIGGER;
while (phaseStackPointer >= 0) {
int scheduledPhase = peekScheduledPhase();
short schedule = getSchedule(scheduledPhase);
short phaseId = getPhaseId(scheduledPhase);
switch (schedule) {
case SCHEDULE_PLACEHOLDER:
{
/* Placeholders are ignored and we continue looking */
popScheduledPhase();
continue;
}
case SCHEDULE_GLOBAL:
case SCHEDULE_COLLECTOR:
case SCHEDULE_MUTATOR:
{
/* Simple phases are just popped off the stack and executed */
popScheduledPhase();
return scheduledPhase;
}
case SCHEDULE_CONCURRENT:
{
/* Concurrent phases are either popped off or we forward to
* an associated non-concurrent phase. */
if (!allowConcurrentPhase) {
popScheduledPhase();
ConcurrentPhase cp = (ConcurrentPhase) getPhase(phaseId);
int alternateScheduledPhase = cp.getAtomicScheduledPhase();
if (VM.VERIFY_ASSERTIONS)
VM.assertions._assert(getSchedule(alternateScheduledPhase) != SCHEDULE_CONCURRENT);
pushScheduledPhase(alternateScheduledPhase);
continue;
}
if (VM.VERIFY_ASSERTIONS) {
/* Concurrent phases can not have a timer */
VM.assertions._assert(getPhase(getPhaseId(scheduledPhase)).timer == null);
}
return scheduledPhase;
}
case SCHEDULE_COMPLEX:
{
/* A complex phase may either be a newly pushed complex phase,
* or a complex phase we are in the process of executing in
* which case we move to the next subphase. */
ComplexPhase p = (ComplexPhase) getPhase(phaseId);
int cursor = incrementComplexPhaseCursor();
if (cursor == 0 && p.timer != null) {
/* Tell the primary thread to start the timer after the next sync. */
startComplexTimer = phaseId;
}
if (cursor < p.count()) {
/* There are more entries, we push the next one and continue */
pushScheduledPhase(p.get(cursor));
continue;
}
/* We have finished this complex phase */
popScheduledPhase();
if (p.timer != null) {
/* Tell the primary thread to stop the timer after the next sync. */
stopComplexTimer = phaseId;
}
continue;
}
default:
{
VM.assertions.fail("Invalid phase type encountered");
}
}
}
return -1;
}