...50; i++) { // 请求RateLimiter, 超过permits会被阻塞 //acquire(int permits)函数主要用于获取permits个令牌,并计算需要等待多长时间,进而挂起等待,并将该值返回 Double acquire = null; if (i == 1) { acquir...
... setExclusiveOwnerThread(Thread.currentThread()); else acquire(1); } //公平锁FairSync final void lock() { acquire(1); } 从源码可以看出,获取锁的时候,非公平锁会先尝试获取,获取不到再调用acquire方法,而公平锁直接调用acqui...
...locked和unlocked,刚创建时状态是unlocked。Locks有两个方法,acquire和release。acquire方法加锁,release方法释放锁,如果acquire枷锁失败,则阻塞,表明其他线程已经加锁。release方法只有当状态是locked调用方法True,如果是unlocked状态,调...
... } abstract void lock(); final boolean nonfairTryAcquire(int var1) { Thread var2 = Thread.currentThread(); int var3 = this.getState(); ...
...oid lock() 留给子类去实现, 默认实现了final boolean nonfairTryAcquire(int acquires) 方法,可以看出其为非公平锁默认实现方式,下面我讲下给看下非公平锁lock方法。 NonfairSync.lock() // ReentrantLock$NonfairSync final void lock() { if (compareAnd...
...eOwnerThread(Thread.currentThread()); else // CAS失败了就调用acquire()方法 acquire(1); } acquire方法由AbstractQueuedSynchronizer提供 public final void acquire(int arg) { if (!tryAcquire(arg)...
...eOwnerThread(Thread.currentThread()); else // CAS失败了就调用acquire()方法 acquire(1); } acquire方法由AbstractQueuedSynchronizer提供 public final void acquire(int arg) { if (!tryAcquire(arg)...
...eOwnerThread(Thread.currentThread()); else // CAS失败了就调用acquire()方法 acquire(1); } acquire方法由AbstractQueuedSynchronizer提供 public final void acquire(int arg) { if (!tryAcquire(arg)...
...eOwnerThread(Thread.currentThread()); else // CAS失败了就调用acquire()方法 acquire(1); } acquire方法由AbstractQueuedSynchronizer提供 public final void acquire(int arg) { if (!tryAcquire(arg)...
...否正在独占资源。只有用到condition才需要去实现它。 tryAcquire(int):独占方式。尝试获取资源,成功则返回true,失败则返回false。 tryRelease(int):独占方式。尝试释放资源,成功则返回true,失败则返回false。 tryAcquireShared(int):共享...
...stract void lock(); /** * Performs non-fair tryLock. tryAcquire is implemented in * subclasses, but both need nonfair try for trylock method. */ final b...
...: +--- ReentrantLock.FairSync.java final void lock() { // 调用 AQS acquire 获取锁 acquire(1); } +--- AbstractQueuedSynchronizer.java /** * 该方法主要做了三件事情: * 1. 调用 tryAcquire 尝试获取锁,该方法需由 AQS 的继承类...
...eate(2); while (true){ System.out.println(rateLimiter.acquire(2)); TimeUnit.SECONDS.sleep(2); System.out.println(rateLimiter.acquire(1)); Sy...
...read()); boolean locked = lock.tryLock(); System.out.println(Lock acquired: + locked); }); stop(executor); 当第一个任务获取锁时,第二个任务获取锁的状态信息: Locked: true Held by me: false Lock acquired: false 作为...
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