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612b0a4139
Fix levels for subsystems that depend on log/err * winprocess (security) doesn't use err: * call windows process security APIs as early as possible * init err after winprocess * move wallclock so it's still after err * network and time depend on log: * make sure that network and time can use logging. * init network and time after log Add comments explaining the module init order. Fixes bug 31615; bugfix on 0.4.0.1-alpha.
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* Copyright (c) 2003, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2019, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file approx_time.c
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* \brief Cache the last result of time(), for performance and testing.
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**/
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#include "orconfig.h"
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#include "lib/subsys/subsys.h"
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#include "lib/wallclock/approx_time.h"
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#include "lib/wallclock/wallclock_sys.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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static int
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subsys_wallclock_initialize(void)
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{
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update_approx_time(time(NULL));
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return 0;
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}
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const subsys_fns_t sys_wallclock = {
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.name = "wallclock",
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.supported = true,
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/* Approximate time is a diagnostic feature, we want it to init right after
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* low-level error handling. */
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.level = -98,
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.initialize = subsys_wallclock_initialize,
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};
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