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39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
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/* Copyright (c) 2003, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2018, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "orconfig.h"
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#include "lib/wallclock/approx_time.h"
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/* =====
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* Cached time
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* ===== */
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#ifndef TIME_IS_FAST
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/** Cached estimate of the current time. Updated around once per second;
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* may be a few seconds off if we are really busy. This is a hack to avoid
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* calling time(NULL) (which not everybody has optimized) on critical paths.
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*/
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static time_t cached_approx_time = 0;
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/** Return a cached estimate of the current time from when
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* update_approx_time() was last called. This is a hack to avoid calling
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* time(NULL) on critical paths: please do not even think of calling it
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* anywhere else. */
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time_t
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approx_time(void)
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{
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return cached_approx_time;
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}
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/** Update the cached estimate of the current time. This function SHOULD be
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* called once per second, and MUST be called before the first call to
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* get_approx_time. */
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void
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update_approx_time(time_t now)
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{
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cached_approx_time = now;
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}
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#endif /* !defined(TIME_IS_FAST) */
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