Synchronization coverage: Measuring code coverage is a highly recommended practice in unit testing, but when it comes to concurrent programs, code coverage is misleading.
同步覆盖：在单元测试中极力推荐测量代码覆盖，但是在测试并行程序时使用它，代码覆盖容易产生误导。
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All updates to recoverable resources or requests to other transactional systems are now part of this unit-of-work, until a synchronization point (syncpoint) is reached within the CICS program.