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AMD to Acquire Xilinx

and Xilinx (NASDAQ: XLNX) today announced they have entered into a definitive agreement for AMD to acquire community at 8:00 AM ET (5:00 AM PT) today to discuss its third quarter 2020 financial results and plans to acquire

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Oracle案例:一次gc buffer busy acquire诊断

本案例来自某客户两节点rac的一次生产故障,现象是大面积的gc buffer busy acquire导致业务瘫痪。 既然是遇到异常等待,那么就看看top event部分: 1节点AWR 可以看到大量的wait class为Cluster的session,top event也看到大量的gc buffer busy acquire

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    BUG#26502135: MYSQLD SEGFAULTS IN MDL_CONTEXT::TRY_ACQUIRE_LOCK_IMPL

    BUG#26502135: MYSQLD SEGFAULTS IN MDL_CONTEXT::TRY_ACQUIRE_LOCK_IMPL ANALYSIS: ========= Server sometimes

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    kafka.common.KafkaException: Failed to acquire lock on file .lock in tmpkafka-logs. A Kafka instan

    Prepare to shutdown (kafka.server.KafkaServerStartable) 43 kafka.common.KafkaException: Failed to acquire Prepare to shutdown (kafka.server.KafkaServerStartable) 105 kafka.common.KafkaException: Failed to acquire Prepare to shutdown (kafka.server.KafkaServerStartable) 167 kafka.common.KafkaException: Failed to acquire

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    接口限流算法:漏桶算法&令牌桶算法

    == 1) { acquire = limiter.acquire(1); } else if (i == 2) { acquire = limiter.acquire(10); } else if (i == 3) { acquire = limiter.acquire (2); } else if (i == 4) { acquire = limiter.acquire(20); } else { acquire = limiter.acquire(2); } executorService.submit(new 2秒,之后又预消费了2个令牌 acquire2 时 .....

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    聊聊BitCaskLock

    this.filename = filename; this.is_write_lock = isWriteLock; } ​ public static BitCaskLock acquire 方法,先通过lock_acquire获取BitCaskLock,如果出现FileAlreadyExistsException则执行delete_stale_lock;其release方法针对is_write_lock 执行file.close()及filename.delete() lock_acquire bitcask-java/src/main/java/com/trifork/bitcask/BitCaskLock.java private static BitCaskLock lock_acquire(File lockFilename, boolean is_write_lock) throws "rws" : "r"); ​ return new BitCaskLock(f, lockFilename, is_write_lock); } lock_acquire方法针对

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    python 多线程 锁lockrlock(并行编程 4)

    threading.Lock() lock.acquire() lock.release() import threading withlock=0 nolock=0 count=10000 lock=threading.Lock() def inwithlock(): global withlock for i in range(count): lock.acquire() withlock () Lock.acquire() Lock.release() Lock.release() 连续两次acquire请求,会导致死锁,因为第一次获得锁之后还没有释放,第二次再来申请,程序就阻塞在这里, 导致第一次申请到的锁无法释放 1.3 可重入锁 RLock就不存在1.2中所提到的死锁 RLock.acquire() RLock.acquire() RLock.release() RLock.release () 但是要保证,有多少次acquire就有多少次release

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    跟着实例学习ZooKeeper的用法: 分布式锁

    void acquire()Acquire the mutex - blocking until it's available. lock.acquire(time, unit)) { throw new IllegalStateException(clientName + " could not acquire 上面的代码没有问题,我们可以多次调用acquire,后续的acquire也不会阻塞。 public Lease acquire()public Collection<Lease> acquire(int qty)public Lease acquire(long time, TimeUnit 当调用acquire, 所有的锁都会被acquire,如果请求失败,所有的锁都会被release。 同样调用release时所有的锁都被release(失败被忽略)。

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    聊聊BitCaskLock

    this.filename = filename; this.is_write_lock = isWriteLock; } public static BitCaskLock acquire filename.delete(); } } file = null; } //...... } BitCaskLock的acquire 方法,先通过lock_acquire获取BitCaskLock,如果出现FileAlreadyExistsException则执行delete_stale_lock;其release方法针对is_write_lock private static BitCaskLock lock_acquire(File lockFilename, boolean is_write_lock) throws "rws" : "r"); return new BitCaskLock(f, lockFilename, is_write_lock); } lock_acquire方法针对

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    python3--线程,锁,同步锁,递归锁,信号量,事件,条件和定时器,队列,线程池

    # 这种锁就叫互斥锁 lock.acquire() lock.acquire() 执行结果 阻塞住了...... () mutexA.acquire() time.sleep(0.1) print(123) mutexA.acquire() mutexA.acquire() 执行结果 阻塞住...... () mutexA.acquire() time.sleep(0.1) print(123) mutexA.acquire() mutexA.acquire() 执行结果 123 递归锁 -- RLock :     rlock.acquire()     print(flag*10)     rlock.acquire()     print(flag * 10)     rlock.acquire() Condition被称为条件变量,除了提供与Lock类似的acquire 和release方法外,还提供了wait和notify方法。线程首先acquire一个条件变量,然后判断一些条件。

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    Python中的线程锁

    threading模块中定义了Lock类,可以方便的处理锁定: #创建锁 mutex = threading.Lock() #锁定 mutex.acquire([timeout])#timeout是超时时间 #释放 mutex.release() 其中,锁定方法acquire可以有一个超时时间的可选参数timeout。 它们之间有一点细微的区别,通过比较下面两段代码来说明: import threading lock = threading.Lock() #Lock对象 lock.acquire() lock.acquire () rLock.acquire() #在同一线程内,程序不会堵塞。 (1) print(ret) ret = lock.acquire(3) print(ret) ret = lock.acquire(True) print(ret) ret = lock.acquire

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    聊聊reactor-netty的PoolResources的两种模式

    () { return acquire(defaultGroup.next().newPromise()); } @Override public Future<Channel> acquire(Promise<Channel> promise) { return pool.acquire(promise).addListener () { return acquire(bootstrap.config().group().next(). <Channel>newPromise()); } @Override public Future<Channel> acquire(final Promise<Channel * @param promise the promise to provide acquire result.

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    并发模型:线程与锁(2)

    acquire()/release() 对可以嵌套;只有最终 release() (最外面一对的 release() ) 将锁解开,才能让其他线程继续处理 acquire() 阻塞。 : #rlock_tut.py import threading num = 0 lock = Threading.Lock() lock.acquire() num += 1 lock.acquire () # lock1.acquire(timeout=2) # 设置超时时间可避免死锁 time.sleep(1) lock2.acquire() ): def run(self): print("start run T2") lock2.acquire() # lock2.acquire(timeout =2) # 设置超时时间可避免死锁 time.sleep(1) lock1.acquire() # lock1.acquire(timeout=2) #

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    ​C++ memory order 勘误

    memory_order_acquire:所有后续 S/L 操作禁止被 re-order 到本 L 前面。和 release-S 连用。 acquire 操作强调本 L 一定是"最先 Load"。 x86_64 实测: a.load(acquire/relaxed) 产生的机器码相同。 UB 操作:a.load(release) 产生的机器码等同于 a.load(acquire)。 不过这个要求已经比单纯的 acquire 严格了,即要求其他线程被 release 的 S 可以发生在本 L 后但必须发生在本 S 前,而单纯的 acquire 只暗含本 L 之后,就能看到相关线程所有被 seq_cst 与 store 操作连用时,与 acquire/consume/acq_rel 等效。

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    Python 学习入门(21)—— 线程

    Thread-2 acquire lock... Thread-3 acquire lock... Thread-1 release lock... Thread-2 get the lock. 拥有RLock的线程可以再次调用acquire(),释放锁时需要调用release()相同次数。 Thread-2 acquire lock... Thread-3 acquire lock... Thread-1 acquire lock again... Semaphore管理一个内置的计数器,每当调用acquire()时-1,调用release() 时+1。 Thread-2 get semaphore Thread-3 acquire semaphore... Thread-4 acquire semaphore...

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    System|Concurrency|条件变量

    send(bb, message): acquire(bb.send_lock) while True: if bb.in – bb.out < N: bb.buf[bb.in mod (receiver同理) Yield yield(): acquire(t_lock) """Suspend running thread""" id = cpus[CPU].thread 这样事实上执行了一些没有必要的acquire和条件判断,影响到了性能。 Updated API 我们需要把release(bb.lock) wait(bb.not_full) acquire(bb.lock)变为一个原子性操作。 do: id = (id + 1) mod N release(t_lock) acquire(t_lock) while threads[id].state !

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    Semaphore信号量详解

    方法列表 type Weighted func NewWeighted(n int64) *Weighted func (s *Weighted) Acquire(ctx context.Context 获取 Acquire 和 TryAcquire 对于获取资源有两种方法,分别为 Acquire() 和 TryAcquire(),两者的区别我们上面已介绍过。 在获取和释放资源前必须先加全局锁。 Each reader can Acquire(1) to obtain a read // lock. if err := sem.Acquire(ctx, 1); err ! 为了保证每次for循环都会正常结束,最后调用了 `sem.Acquire(ctx, int64(maxWorkers)),表示最后一次执行必须获取的权重值为maxWorkers。

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    python源码阅读笔记之线程机制

    在thread模块中,有如下的方法: static PyMethodDef lock_methods[] = { {"acquire_lock", (PyCFunction)lock_PyThread_acquire_lock , METH_VARARGS, acquire_doc}, {"acquire", (PyCFunction)lock_PyThread_acquire_lock, METH_VARARGS, acquire_doc}, {"release_lock", (PyCFunction)lock_PyThread_release_lock, METH_NOARGS , METH_VARARGS, acquire_doc}, {"__exit__", (PyCFunction)lock_PyThread_release_lock, (PyThread_type_lock aLock, int waitflag) { int success ; dprintf(("%ld: PyThread_acquire_lock

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    【Java 并发编程实战】信号量 (Semaphore)

    2020-02-10 15:42 */ object SemaphoreDemo { fun task(semaphore: Semaphore) { semaphore.acquire Each acquire blocks if necessary until a permit is available, and then takes it. When set false, this class makes no guarantees about the order in which threads acquire permits. This class also provides convenience methods to acquire and release multiple permits at a time. " method such as acquire() in another thread.

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    python多线程编程(4): 死锁和可重入锁

    time class MyThread(threading.Thread): def do1(self): global resA, resB if mutexA.acquire msg = self.name+' got resA' print msg if mutexB.acquire msg = self.name+' got resB' print msg if mutexA.acquire RLock内部维护着一个Lock和一个counter变量,counter记录了acquire的次数,从而使得资源可以被多次require。 直到一个线程所有的acquire都被release,其他的线程才能获得资源。

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