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tor/src/common/compat_time.h

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Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
Run the copyright update script.
2017-03-15 21:13:17 +01:00
* Copyright (c) 2007-2017, The Tor Project, Inc. */
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
/* See LICENSE for licensing information */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
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/**
* \file compat_time.h
*
* \brief Functions and types for monotonic times.
*
* monotime_* functions try to provide a high-resolution monotonic timer with
* something the best resolution the system provides. monotime_coarse_*
* functions run faster (if the operating system gives us a way to do that)
* but produce a less accurate timer: accuracy will probably be on the order
* of tens of milliseconds.
*/
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
#ifndef TOR_COMPAT_TIME_H
#define TOR_COMPAT_TIME_H
#include "orconfig.h"
loony mingwcross bug: insist we dont have clock_gettime.
2016-07-21 14:09:00 +02:00
#ifdef _WIN32
#undef HAVE_CLOCK_GETTIME
#endif
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#if defined(HAVE_CLOCK_GETTIME)
/* to ensure definition of CLOCK_MONOTONIC_COARSE if it's there */
#include <time.h>
#endif
Split some long #if lines to make the #endif annotator happy
2017-09-15 22:15:27 +02:00
#if !defined(HAVE_STRUCT_TIMEVAL_TV_SEC)
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
/** Implementation of timeval for platforms that don't have it. */
struct timeval {
time_t tv_sec;
unsigned int tv_usec;
};
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* !defined(HAVE_STRUCT_TIMEVAL_TV_SEC) */
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
/** Represents a monotonic timer in a platform-dependent way. */
typedef struct monotime_t {
#ifdef __APPLE__
/* On apple, there is a 64-bit counter whose precision we must look up. */
uint64_t abstime_;
#elif defined(HAVE_CLOCK_GETTIME)
/* It sure would be nice to use clock_gettime(). Posix is a nice thing. */
struct timespec ts_;
#elif defined (_WIN32)
/* On Windows, there is a 64-bit counter whose precision we must look up. */
int64_t pcount_;
#else
#define MONOTIME_USING_GETTIMEOFDAY
/* Otherwise, we will be stuck using gettimeofday. */
struct timeval tv_;
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(__APPLE__) || ... */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
} monotime_t;
Split some long #if lines to make the #endif annotator happy
2017-09-15 22:15:27 +02:00
#if defined(CLOCK_MONOTONIC_COARSE) && \
defined(HAVE_CLOCK_GETTIME)
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#define MONOTIME_COARSE_FN_IS_DIFFERENT
#define monotime_coarse_t monotime_t
#elif defined(_WIN32)
#define MONOTIME_COARSE_FN_IS_DIFFERENT
#define MONOTIME_COARSE_TYPE_IS_DIFFERENT
/** Represents a coarse monotonic time in a platform-independent way. */
typedef struct monotime_coarse_t {
uint64_t tick_count_;
} monotime_coarse_t;
Use mach_approximate_time() for coarse time where available. This lets us have a coarse-time implementation with reasonable performance characteristics on OSX and iOS. Implements 24427.
2017-12-08 15:24:02 +01:00
#elif defined(__APPLE__) && defined(HAVE_MACH_APPROXIMATE_TIME)
#define MONOTIME_COARSE_FN_IS_DIFFERENT
#define monotime_coarse_t monotime_t
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#else
#define monotime_coarse_t monotime_t
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(CLOCK_MONOTONIC_COARSE) && ... || ... */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
/**
* Initialize the timing subsystem. This function is idempotent.
*/
void monotime_init(void);
/**
* Set <b>out</b> to the current time.
*/
Revert "Make the monotonic{_coarse,}_get() functions mockable." This reverts commit 2999f0b33fec8e91ba8e4680d3f9d03b09fe9501.
2016-07-21 10:30:21 +02:00
void monotime_get(monotime_t *out);
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
/**
* Return the number of nanoseconds between <b>start</b> and <b>end</b>.
*/
int64_t monotime_diff_nsec(const monotime_t *start, const monotime_t *end);
/**
* Return the number of microseconds between <b>start</b> and <b>end</b>.
*/
int64_t monotime_diff_usec(const monotime_t *start, const monotime_t *end);
/**
* Return the number of milliseconds between <b>start</b> and <b>end</b>.
*/
int64_t monotime_diff_msec(const monotime_t *start, const monotime_t *end);
/**
* Return the number of nanoseconds since the timer system was initialized.
*/
uint64_t monotime_absolute_nsec(void);
/**
* Return the number of microseconds since the timer system was initialized.
*/
uint64_t monotime_absolute_usec(void);
/**
* Return the number of milliseconds since the timer system was initialized.
*/
uint64_t monotime_absolute_msec(void);
Add monotime functions for clearing monotonic times We need this to replace some of our "msec" users with monotime users.
2017-12-13 14:28:04 +01:00
/**
* Set <b>out</b> to zero.
*/
void monotime_zero(monotime_t *out);
/**
* Return true iff <b>out</b> is zero
*/
int monotime_is_zero(const monotime_t *out);
Add a function to add msec to a monotime. We'll use this for the channel padding logic.
2017-12-13 14:54:29 +01:00
/**
* Set <b>out</b> to N milliseconds after <b>val</b>.
*/
/* XXXX We should add a more generic function here if we ever need to */
void monotime_add_msec(monotime_t *out, const monotime_t *val, uint32_t msec);
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#if defined(MONOTIME_COARSE_FN_IS_DIFFERENT)
/**
* Set <b>out</b> to the current coarse time.
*/
Revert "Make the monotonic{_coarse,}_get() functions mockable." This reverts commit 2999f0b33fec8e91ba8e4680d3f9d03b09fe9501.
2016-07-21 10:30:21 +02:00
void monotime_coarse_get(monotime_coarse_t *out);
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
uint64_t monotime_coarse_absolute_nsec(void);
uint64_t monotime_coarse_absolute_usec(void);
uint64_t monotime_coarse_absolute_msec(void);
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#else /* !(defined(MONOTIME_COARSE_FN_IS_DIFFERENT)) */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#define monotime_coarse_get monotime_get
#define monotime_coarse_absolute_nsec monotime_absolute_nsec
#define monotime_coarse_absolute_usec monotime_absolute_usec
#define monotime_coarse_absolute_msec monotime_absolute_msec
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(MONOTIME_COARSE_FN_IS_DIFFERENT) */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
Add a new notion of "stamps" to be a fast 32-bit monotonic timestamp The goal here is to replace our use of msec-based timestamps with something less precise, but easier to calculate. We're doing this because calculating lots of msec-based timestamps requires lots of 64/32 division operations, which can be inefficient on 32-bit platforms. We make sure that these stamps can be calculated using only the coarse monotonic timer and 32-bit bitwise operations.
2017-11-21 18:28:16 +01:00
/**
* Return a "timestamp" approximation for a coarse monotonic timer.
* This timestamp is meant to be fast to calculate and easy to
* compare, and have a unit of something roughly around 1 msec.
*
* It will wrap over from time to time.
*
* It has no defined zero point.
*/
uint32_t monotime_coarse_to_stamp(const monotime_coarse_t *t);
/**
* Convert a difference, expressed in the units of monotime_coarse_to_stamp,
* into an approximate number of milliseconds.
*/
uint64_t monotime_coarse_stamp_units_to_approx_msec(uint64_t units);
uint32_t monotime_coarse_get_stamp(void);
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#if defined(MONOTIME_COARSE_TYPE_IS_DIFFERENT)
int64_t monotime_coarse_diff_nsec(const monotime_coarse_t *start,
const monotime_coarse_t *end);
int64_t monotime_coarse_diff_usec(const monotime_coarse_t *start,
const monotime_coarse_t *end);
int64_t monotime_coarse_diff_msec(const monotime_coarse_t *start,
const monotime_coarse_t *end);
Add monotime functions for clearing monotonic times We need this to replace some of our "msec" users with monotime users.
2017-12-13 14:28:04 +01:00
void monotime_coarse_zero(monotime_coarse_t *out);
int monotime_coarse_is_zero(const monotime_coarse_t *val);
Add a function to add msec to a monotime. We'll use this for the channel padding logic.
2017-12-13 14:54:29 +01:00
void monotime_coarse_add_msec(monotime_coarse_t *out,
const monotime_coarse_t *val, uint32_t msec);
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#else /* !(defined(MONOTIME_COARSE_TYPE_IS_DIFFERENT)) */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#define monotime_coarse_diff_nsec monotime_diff_nsec
#define monotime_coarse_diff_usec monotime_diff_usec
#define monotime_coarse_diff_msec monotime_diff_msec
Add monotime functions for clearing monotonic times We need this to replace some of our "msec" users with monotime users.
2017-12-13 14:28:04 +01:00
#define monotime_coarse_zero monotime_zero
#define monotime_coarse_is_zero monotime_is_zero
Add a function to add msec to a monotime. We'll use this for the channel padding logic.
2017-12-13 14:54:29 +01:00
#define monotime_coarse_add_msec monotime_add_msec
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(MONOTIME_COARSE_TYPE_IS_DIFFERENT) */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
void tor_gettimeofday(struct timeval *timeval);
#ifdef TOR_UNIT_TESTS
void tor_sleep_msec(int msec);
Actually make monotonic time functions mockable. This is different from making the functions mockable, since monotime_t is opaque and so providing mocks for the functions is really hard.
2016-07-21 11:04:22 +02:00
void monotime_enable_test_mocking(void);
void monotime_disable_test_mocking(void);
void monotime_set_mock_time_nsec(int64_t);
#if defined(MONOTIME_COARSE_FN_IS_DIFFERENT)
void monotime_coarse_set_mock_time_nsec(int64_t);
#else
#define monotime_coarse_set_mock_time_nsec monotime_set_mock_time_nsec
#endif
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(TOR_UNIT_TESTS) */
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
#ifdef COMPAT_TIME_PRIVATE
Expose monotonic time ratchet functions for testing.
2016-07-13 16:18:15 +02:00
#if defined(_WIN32) || defined(TOR_UNIT_TESTS)
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
STATIC int64_t ratchet_performance_counter(int64_t count_raw);
STATIC int64_t ratchet_coarse_performance_counter(int64_t count_raw);
#endif
Expose monotonic time ratchet functions for testing.
2016-07-13 16:18:15 +02:00
#if defined(MONOTIME_USING_GETTIMEOFDAY) || defined(TOR_UNIT_TESTS)
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
STATIC void ratchet_timeval(const struct timeval *timeval_raw,
struct timeval *out);
#endif
Expose monotonic time ratchet functions for testing.
2016-07-13 16:18:15 +02:00
#ifdef TOR_UNIT_TESTS
void monotime_reset_ratchets_for_testing(void);
#endif
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* defined(COMPAT_TIME_PRIVATE) */
Basic portable monotonic timer implementation This code uses QueryPerformanceCounter() [**] on Windows, mach_absolute_time() on OSX, clock_gettime() where available, and gettimeofday() [*] elsewhere. Timer types are stored in an opaque OS-specific format; the only supported operation is to compute the difference between two timers. [*] As you know, gettimeofday() isn't monotonic, so we include a simple ratchet function to ensure that it only moves forward. [**] As you may not know, QueryPerformanceCounter() isn't actually always as monotonic as you might like it to be, so we ratchet that one too. We also include a "coarse monotonic timer" for cases where we don't actually need high-resolution time. This is GetTickCount{,64}() on Windows, clock_gettime(CLOCK_MONOTONIC_COARSE) on Linux, and falls back to regular monotonic time elsewhere.
2016-07-08 18:53:51 +02:00
Run our #else/#endif annotator on our source code.
2017-09-15 22:24:44 +02:00
#endif /* !defined(TOR_COMPAT_TIME_H) */
Move our "what time is it now" compat functions into a new module I'm not moving our "format and parse the time" functions, since those have been pretty volatile over the last couple of years.
2016-07-08 16:38:59 +02:00
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