Webb19 okt. 2016 · InnoDB 实现标准的航机所 有两种类型的锁,shared (S) locks and exclusive (X) locks. 共享和排它锁. 1.一个共享锁允许事务是有一个锁来读取一行. 2.一个排它锁允许事务持有锁来更新或者删除记录. 如果事务T1 持有一个共享锁在记录r, 另外一个事务T2 请求一个lock 在记录r 是 ... Webb13 jan. 2024 · boost中shared_lock和unique_lock的区别 shared_lock和unique_lock一般搭配使用,用来解决变量的读写冲突。shared_lock是read lock,即设置读标志,同时限制写权限。当要读取某个变量时,使用shared_lock,相当于为此变量设置了读标志位,不影响其他线程(或进程)读取该变量,但是不允许其他线程(或进程)改写该变量。
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