Web1, ReentrantLock. ReentrantLock is based on AQS, and the basis of AQS is CAS. There are three static inner classes in ReentrantLock, which are the abstract inner class Sync … WebWhen 72 * the thread has finished with the item it is returned back to the 73 * pool and a permit is returned to the semaphore, allowing another 74 * thread to acquire that item. Note that no synchronization lock is 75 * held when {@link #acquire} is called as that would prevent an item 76 * from being returned to the pool.
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WebSep 20, 2024 · When thread is reentrant. When the thread has acquired the lock multiple times (i.e. Reentrant), we reduce the state value by 1 each time the thread calls … WebApr 7, 2024 · public ReentrantLock() { sync = new NonfairSync(); } public ReentrantLock(boolean fair) { sync = fair ? new FairSync() : new NonfairSync(); } 3.2 内部类 Sync. Sync 重写的方法 tryRelease, tryAcquire(子类重写)，ReentrantLock实现的是AQS的独占模式，也就是独占锁，这个锁是悲观锁 order of service for communion
Source code analysis of AQS (AbstractQueuedSynchronizer)
Webnew FairSync(permits) : new NonfairSync(permits); } /** * Acquires a permit from this semaphore, blocking until one is * available, or the thread is {@linkplain Thread#interrupt … WebFair locks FairSync, a new thread must be blocked at the back of the old thread is blocked grab lock; Unfair lock NonfairSync new thread is blocked lock could grab; The default lock … WebThe Sync class inherits the AbstractQueuedSynchronizer class. This shows that ReentrantLock is based on AQS. ' Sync,FairSync and NonFairSync are static internal … how to treat a jammed knuckle