lock
acquire(1)
tryAcquire acquireQueued addWaiter
lockInterruptibly
acquireInterruptibly(1)
tryAcquire doAcquireInterruptibly
unlock
release(1)
tryRelease
Semaphore
acquire
acquireSharedInterruptibly(1)
tryAcquireShared doAcquireSharedInterruptibly
acquireUninterruptibly
acquireShared(1)
tryAcquireShared doAcquireShared
release
releaseShared(1)
tryReleaseShared doReleaseShared
CountDownLatch
await
acquireSharedInterruptibly(1)
tryAcquireShared doAcquireSharedInterruptibly
countDown
releaseShared(1)
tryReleaseShared doReleaseShared
ReentrantRead
ReadLock.lock
acquireShared
tryAcquireShared doAcquireShared
ReadLock.unlock
releaseShared
tryReleaseShared doReleaseShared
WriteLock.lock
acquire
tryAcquire acquireQueued addWaiter
WriteLock.unlock
release
tryRelease
用到的方法：
acquire
独占模式获取对象，忽略中断
acquireInterruptibly
独占模式获取对象，响应中断
acquireShared
共享模式获取对象，忽略中断
acquireSharedInterruptibly
共享模式获取对象，响应中断
release
独占模式释放对象
releaseShared
共享模式释放对象
重写的方法：
tryAcquire
tryAcquireShared
tryRelease
tryReleaseShared
