Synchronize-Lock - Related information

• Are the following two Synchronize blocks mutually exclusive?

  Object obj=new Object(); Object obj2=obj; synchronized(obj){} synchronized(obj2){} what if this is the case? Object obj=new Object(); synchronized(obj){} obj=new Object(); synchronized(obj){} ...

  Java Synchronize-Lock Synchronize-Block synchronized

  Mar.02,2021
• Why does DCL double check lock need two layers of judgment?

  We know that DCL double lock is written as: synchronized (SingletonLazy5.class) { if(null == singletonLazy) { singletonLazy = new SingletonLazy5(); } } ...

  Synchronize-lock java

  Mar.02,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b34ea9-2ac97.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34ea9-2ac97.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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