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Maybe volatile is needed here (to ensure semantics).
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Describe what this PR does / why we need it
优化获取时间戳逻辑
Does this pull request fix one issue?
Fixes #2902
Describe how you did it
简化读/写计数器
在频繁获取时间戳的场景中,或许并不需要过于精确的计数器。当前版本的读写计数器是精确累加开销稍大。