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docs/locks.rst
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SELECT is_used_lock();
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SELECT wait_for_lock();
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SELECT release_lock_and_wait();
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If a session should exit, whatever locks it was holding will be deleted.
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Please note, get_lock() was designed to be compatible with MySQL. If you
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hold any locks when calling get_lock() they will be released. For this
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reason you may want to consider calling get_locks() instead.
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release_lock_and_wait() released the named lock, and then waits for another
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session to try to obtain ownership. If it does not own the lock, it returns
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with a zero.
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Information on all barriers can be found in the DATA_DICTIONARY.USER_LOCKS
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table;
 
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table;
 
 
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