[jira] [Created] (THRIFT-4557) use RWLock instead of Lock

[gansteed (JIRA)]

gansteed created THRIFT-4557:
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             Summary: use RWLock instead of Lock
                 Key: THRIFT-4557
                 URL: https://issues.apache.org/jira/browse/THRIFT-4557
             Project: Thrift
          Issue Type: Improvement
            Reporter: gansteed


use Read-Write Lock to protect `p.closed`



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