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[PERF] Use std::call_once to arrange timer record stop #344

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Prefer std::once_flag and std::call_once() over plain
C-style flag to arrange (the body of) TimerRecord::stop()
to execute just once, adjust related code.

Signed-off-by: Dmitry Antipov dantipov@cloudlinux.com

Prefer 'std::once_flag' and 'std::call_once' over plain
C-style flag to arrange (the body of) 'TimerRecord::stop()'
to execute just once, adjust related code.

Signed-off-by: Dmitry Antipov <dantipov@cloudlinux.com>
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rui314 commented Feb 14, 2022

std::call_once is used to make the thing that is protected by call_once thread-safe. In this case, stop is called by a single thread, so we don't need to use call_once.

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