/*
* Copyright 2016 higherfrequencytrading.com
*
* 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 net.openhft.affinity.impl;
import com.sun.jna.LastErrorException;
import com.sun.jna.Library;
import com.sun.jna.Native;
import net.openhft.affinity.IAffinity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.management.ManagementFactory;
import java.util.BitSet;
/**
* This is essentially the same as the NullAffinity implementation but with concrete
* support for getThreadId().
*
* @author daniel.shaya
*/
public enum OSXJNAAffinity implements IAffinity {
INSTANCE;
private static final Logger LOGGER = LoggerFactory.getLogger(OSXJNAAffinity.class);
private final ThreadLocal<Integer> THREAD_ID = new ThreadLocal<>();
@Override
public BitSet getAffinity() {
return new BitSet();
}
@Override
public void setAffinity(final BitSet affinity) {
LOGGER.trace("unable to set mask to {} as the JNIa nd JNA libraries and not loaded", Utilities.toHexString(affinity));
}
@Override
public int getCpu() {
return -1;
}
@Override
public int getProcessId() {
final String name = ManagementFactory.getRuntimeMXBean().getName();
return Integer.parseInt(name.split("@")[0]);
}
@Override
public int getThreadId() {
Integer tid = THREAD_ID.get();
if (tid == null) {
tid = CLibrary.INSTANCE.pthread_self();
//The tid assumed to be an unsigned 24 bit, see net.openhft.lang.Jvm.getMaxPid()
tid = tid & 0xFFFFFF;
THREAD_ID.set(tid);
}
return tid;
}
interface CLibrary extends Library {
CLibrary INSTANCE = (CLibrary)
Native.loadLibrary("libpthread.dylib", CLibrary.class);
int pthread_self() throws LastErrorException;
}
}