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doc: document atexit_sleep_ms flag in race_detector
It was pointed out to me that the thread sanitizer library has many more flags than the ones documented in this doc page. In particular, I was able to make use of GORACE=atexit_sleep_ms=10 to reduce the amount that 'go test -race' will sleep before finishing. I'm sure that this flag will be useful to others in the future, so add it here. This is still not a complete list, but we can simply add useful flags that work when we think they deserve a mention. Change-Id: If199d36fd80a0945af90055d110519e5dba27361 Reviewed-on: https://go-review.googlesource.com/c/go/+/200863 Reviewed-by: Heschi Kreinick <heschi@google.com>
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@ -133,6 +133,11 @@ cost of increased memory usage.
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<code>halt_on_error</code> (default <code>0</code>): Controls whether the program
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exits after reporting first data race.
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</li>
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<li>
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<code>atexit_sleep_ms</code> (default <code>1000</code>): Amount of milliseconds
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to sleep in the main goroutine before exiting.
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</li>
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</ul>
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<p>
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