27 lines
553 B
Plaintext
27 lines
553 B
Plaintext
CREATE TABLE t1 (c1 INT NOT NULL PRIMARY KEY) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (0);
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# On connection 1
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BEGIN;
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SELECT * FROM t1 WHERE c1=0 FOR SHARE;
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c1
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0
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# On connection 2
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BEGIN;
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SET DEBUG_SYNC = 'lock_wait_will_wait SIGNAL con2_will_wait';
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SELECT * FROM t1 WHERE c1=0 FOR UPDATE;
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# On connection 3
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SET DEBUG_SYNC = 'now WAIT_FOR con2_will_wait';
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include/start_transaction_high_prio.inc
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START TRANSACTION /* HIGH PRIORITY */;
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SELECT * FROM t1 WHERE c1=0 FOR SHARE;
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c1
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0
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COMMIT;
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# On connection 1
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COMMIT;
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# On connection 2
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c1
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0
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COMMIT;
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DROP TABLE t1;
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