LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); } UP中很简单,本质上就是一个preempt_disable而已,SMP中稍显复杂,preempt_disable当然也是必须的,spin_acquire可以略过,这是和运行时检查锁的有效性有关的,如果没有定义CONFIG_LOCKDEP其实就是空函数。如果没有定义CONFIG_LOCK_STAT(和锁的统计...
Attempt to acquire the writer lock recursively: LockRecursionException: Write lock may not be acquired with read lock held. This pattern is prone to deadlocks. Consider using the upgrade lock. */ RemarksLockRecursionException is thrown for several reasons, including the following:...
The following SELECT statement is executed under the transaction that is still active under session 1. Because of the exclusive (X) table lock hint, the transaction will attempt to acquire an X lock on the table. However, the S lock that is being held by the transaction in session 2 will...
Therefore, one method to prevent lock escalation on a particular table is to acquire and hold a lock on a different connection that isn't compatible with the escalated lock type. An IX (intent exclusive) lock at the table level doesn't lock any rows or pages, but it is still not ...
ALTER TABLE SET/RESET (storage_parameter): Hologres allows you to execute this statement to configure only extended attributes and the PostgreSQL native attribute autovacuum_enabled. This statement that is executed to configure the preceding attributes does not acquire any locks on tables. If you exec...
I am in the integrated terminal of VS Code and have the DVC extension (v0.5.18) installed and enabled. DVC version currently is 2.35.1 installed with pip. Here's an edited snapshot of my recent bash history where I've marked commands which encountered the "unable to acquire lock" with...
(Note that the non-blocking ReadLock#tryLock() and WriteLock#tryLock() methods do not honor this fair setting and will immediately acquire the lock if it is possible, regardless of waiting threads.) Reentrancy This lock allows both readers and writers to reacquire read or write locks in the...
Wox version: 1.3.183 OS Version: Microsoft Windows NT 10.0.14393.0 Date: 11/21/2016 22:27:56 Exception: Squirrel System.Exception Couldn't acquire lock, is another instance running 在 Squirrel.SingleGlobalInstance..ctor(String key, TimeSp...
Currently enabled: yes Currently running: no Failed balancer rounds in last 5 attempts: 0 Migration Results for the last 24 hours: 8 : Success 1 : Failed with error ‘could not acquire collection lock for mongodbtest.usertable to migrate chunk [{ : MinKey },{ : MaxKey }) :: ...
A CannotAcquireLockException is shown several times in the server log: ERROR [http--10.1.1.133-8080-281][JSONWebServiceServiceAction:97] org.springframework.dao.CannotAcquireLockException: PreparedStatementCallback; SQL [INSERT INTO Users_UserGroups (userGroupId, userId) VALUES (?, ?)]; Unkn...