...50; i++) { // 請求RateLimiter, 超過permits會被阻塞 //acquire(int permits)函數(shù)主要用于獲取permits個令牌,并計算需要等待多長時間,進(jìn)而掛起等待,并將該值返回 Double acquire = null; if (i == 1) { acquir...
... setExclusiveOwnerThread(Thread.currentThread()); else acquire(1); } //公平鎖FairSync final void lock() { acquire(1); } 從源碼可以看出,獲取鎖的時候,非公平鎖會先嘗試獲取,獲取不到再調(diào)用acquire方法,而公平鎖直接調(diào)用acqui...
...locked和unlocked,剛創(chuàng)建時狀態(tài)是unlocked。Locks有兩個方法,acquire和release。acquire方法加鎖,release方法釋放鎖,如果acquire枷鎖失敗,則阻塞,表明其他線程已經(jīng)加鎖。release方法只有當(dāng)狀態(tài)是locked調(diào)用方法True,如果是unlocked狀態(tài),調(diào)...
... } abstract void lock(); final boolean nonfairTryAcquire(int var1) { Thread var2 = Thread.currentThread(); int var3 = this.getState(); ...
...oid lock() 留給子類去實現(xiàn), 默認(rèn)實現(xiàn)了final boolean nonfairTryAcquire(int acquires) 方法,可以看出其為非公平鎖默認(rèn)實現(xiàn)方式,下面我講下給看下非公平鎖lock方法。 NonfairSync.lock() // ReentrantLock$NonfairSync final void lock() { if (compareAnd...
...eOwnerThread(Thread.currentThread()); else // CAS失敗了就調(diào)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失敗了就調(diào)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失敗了就調(diào)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失敗了就調(diào)用acquire()方法 acquire(1); } acquire方法由AbstractQueuedSynchronizer提供 public final void acquire(int arg) { if (!tryAcquire(arg)...
...保證了多線程情況下數(shù)據(jù)的正確性。當(dāng)一個線程調(diào)用鎖的acquire()方法獲得鎖時,鎖就進(jìn)入locked狀態(tài)。每次只有一個線程可以獲得鎖。如果此時另一個線程試圖獲得這個鎖,該線程就會變?yōu)閎locked狀態(tài),稱為同步阻塞...
...否正在獨占資源。只有用到condition才需要去實現(xiàn)它。 tryAcquire(int):獨占方式。嘗試獲取資源,成功則返回true,失敗則返回false。 tryRelease(int):獨占方式。嘗試釋放資源,成功則返回true,失敗則返回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() { // 調(diào)用 AQS acquire 獲取鎖 acquire(1); } +--- AbstractQueuedSynchronizer.java /** * 該方法主要做了三件事情: * 1. 調(diào)用 tryAcquire 嘗試獲取鎖,該方法需由 AQS 的繼承類...
...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); 當(dāng)?shù)谝粋€任務(wù)獲取鎖時,第二個任務(wù)獲取鎖的狀態(tài)信息: Locked: true Held by me: false Lock acquired: false 作為...
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