同步

一、线程同步

public synchronized void getM1(){ a();}public synchronized void getM2(){ b(); c(); d();}

 

二、加RW lock

private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();private ReadLock readLock = lock.readLock();private WriteLock writeLock = lock.writeLock();public void a() { writeLock.lock(); try { // } finally { writeLock.unlock(); }}public void b() { readLock.lock(); try { // } finally { readLock.unlock(); }}public void c() { readLock.lock(); try { // } finally { readLock.unlock(); }}public void d() { readLock.lock(); try { // } finally { readLock.unlock(); }}