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serializable but not linearizable
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| T1: w(x=1) | |
| T2: r(x=null) | |
| SCHEDULE NL: | |
| @ wall clock time 1, T1 begins and commits | |
| @ wall clock time 2, T2 begins and commits | |
| NL is serializable: NL is equivalent to executing T2;T1 | |
| NL is not linearizable: T2 should have read x=1 |
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