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+ o Minor features (infrastructure):
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+ - Tor now includes an improved timer backend, so that we can efficiently
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+ support tens or hundreds of thousands of concurrent timers, as will be
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+ needed for some of our planned anti-traffic-analysis work. This code
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+ is based on William Ahern's "timeout.c" project, which implements
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+ a "tickless hierarchical timing wheel". Closes ticket #18365.
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+
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