com.lmax.disruptor.BusySpinWaitStrategy Maven / Gradle / Ivy
/*
* Copyright 2011 LMAX Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.lmax.disruptor;
import com.lmax.disruptor.util.ThreadHints;
/**
* Busy Spin strategy that uses a busy spin loop for {@link com.lmax.disruptor.EventProcessor}s waiting on a barrier.
*
* This strategy will use CPU resource to avoid syscalls which can introduce latency jitter. It is best
* used when threads can be bound to specific CPU cores.
*/
public final class BusySpinWaitStrategy implements WaitStrategy
{
@Override
public long waitFor(
final long sequence, Sequence cursor, final Sequence dependentSequence, final SequenceBarrier barrier)
throws AlertException, InterruptedException
{
long availableSequence;
while ((availableSequence = dependentSequence.get()) < sequence)
{
barrier.checkAlert();
ThreadHints.onSpinWait();
}
return availableSequence;
}
@Override
public void signalAllWhenBlocking()
{
}
}