设置寄存器X, 指向latch内存地址A 如果内存地址A的值是0, 那么将它设置为0xff <= CPU原子操作 如果内存地址A的值设为0xff, 那么就"持有"latch 如果不是, 就回到最上一步重试, 持续尝试N次 CPU原子操作, "Test and Set"CPU指令 持续尝试是spin的过程: 图3: spin过程 共享latch 实现要复杂很多, 应用在一...
the lock set, the claw and the handle form a pre-assembled assembly unit, Installation for insertion through the transverse hole, the latch being configured to pass through the guide member and the locking pawl at the pawl by a lock seat in the pin supporting hole installation, the pin is...
publicclassMetuximplementsLock{//静态内部类,自定义同步器privatestaticclassSyncextendsAbstractQueuedSynchronizer{//是否处于占用状态@OverrideprotectedbooleanisHeldExclusively(){returngetState()==1;}//当状态为0的时候获取锁@OverrideprotectedbooleantryAcquire(int arg){if(compareAndSetState(0,1)){setExclusiveOwne...
Latch: Zinc alloy /brass/stainless steel. Square bolt: 1 bolt in zinc alloy material, also canbe brass and stainless steel. Operation Good! Item No. Detail Stainless Steel Finish SSS Property Modern Style Made in China http://withsafe.en.made-in-c...
2、用户锁有别于物理概念上的锁(如DML lock(data lock),DDL lock(dictionary lock)和internal lock/latch),可以看成是逻辑上的一种锁定, 且他们两者之间也是不相冲突的。比如如果会话1基于某个物理表的表明定义了一用户锁,此时会话2实际上是可以对此物理表做任何DDL,DML操作的。
Latch: Zinc alloy /brass/stainless steel. Square bolt: 1 bolt in zinc alloy material, also canbe brass and stainless steel. Operation Good! http://withsafe.en.made-in-china.com/ Other Similar Styles HOT SALE Packaging & Shipping Company Profile FAQ 1...
Standard Silver Finish Knob Lockset Fitting for School @_@ Q:What certificate you have?A:We have CE and UL certificate, all our product design follow up the international standard, such as the EN/CE, UL, ANSI standard. Q : Do you accept OEM or ODM? A: Yes...
latch lock 行级锁与表级锁 锁的分类 共享锁和排他锁 共享锁 排他锁 意向锁 锁的算法实现 Record Lock Gap Lock Next-Key Lock 加锁规则 举例说明 场景1:主键索引等值间歇锁 场景2:非唯一索引等值锁 什么是锁 Mysql中主要有两种锁分别是lock和latch,本文主要介绍的是lock,也是我们常说的对于事务的锁。
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Luxury Door Lock with Curving Lever Handle in Zinc Alloy Polished Gold Finish, Find Details and Price about Lever Lockset Lock Set from Luxury Door Lock with Curving Lever Handle in Zinc Alloy Polished Gold Finish - D&D HARDWARE INDUSTRIAL CO., LIMITED