Green Sky
a3126d581b
82460b212 feat: add ngc events 24b54722a fix: Ensure we have allocators available for the error paths. 48dbcfebc cleanup: Remove redundant `-DSODIUM_EXPORT` from definitions. 0cef46ee9 cleanup: Fix a few more clang-tidy warnings. 0c5b918e9 cleanup: Fix a few more clang-tidy warnings. 4d3c97f49 cleanup: Enforce stricter identifier naming using clang-tidy. a549807df refactor: Add `mem` module to allow tests to override allocators. 6133fb153 chore: Add devcontainer setup for codespaces. 620e07ecd chore: Set a timeout for tests started using Conan c0ec33b16 chore: Migrate Windows CI from Appveyor to Azure DevOps 8ed47f3ef fix incorrect documentation a1e245841 docs: Fix doxygen config and remove some redundant comments. b0f633185 chore: Fix the Android CI job 7469a529b fix: Add missing `#include <array>`. 2b1a6b0d2 add missing ngc constants getter declarations and definitions 2e02d5637 chore: Add missing module dependencies. REVERT: 67badf694 feat: add ngc events git-subtree-dir: external/toxcore/c-toxcore git-subtree-split: 82460b2124216af1ac9d63060de310a682a2fd15
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2016-2020 The TokTok team.
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* Copyright © 2014 Tox project.
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*/
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#ifndef C_TOXCORE_TOXCORE_MONO_TIME_H
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#define C_TOXCORE_TOXCORE_MONO_TIME_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "attributes.h"
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#include "mem.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* The timer portion of the toxcore event loop.
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*
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* We update the time exactly once per tox_iterate call. Programs built on lower
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* level APIs such as the DHT bootstrap node must update the time manually in
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* each iteration.
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*
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* Time is kept per Tox instance, not globally, even though "time" as a concept
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* is global. This is because by definition `mono_time` represents the time at
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* the start of an iteration, and also by definition the time when all network
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* events for the current iteration occurred. This affects mainly two situations:
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*
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* 1. Two timers started in the same iteration: e.g. two timers set to expire in
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* 10 seconds will both expire at the same time, i.e. about 10 seconds later.
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* If the time were global, `mono_time` would be a random number that is
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* either the time at the start of an iteration, or 1 second later (since the
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* timer resolution is 1 second). This can happen when one update happens at
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* e.g. 10:00:00.995 and a few milliseconds later a concurrently running
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* instance updates the time at 10:00:01.005, making one timer expire a
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* second after the other.
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* 2. One timer based on an event: if we want to encode a behaviour of a timer
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* expiring e.g. 10 seconds after a network event occurred, we simply start a
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* timer in the event handler. If a concurrent instance updates the time
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* underneath us, it may instead expire 9 seconds after the event.
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*
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* Both these situations cause incorrect behaviour randomly. In practice,
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* toxcore is somewhat robust against strange timer behaviour, but the
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* implementation should at least theoretically match the specification.
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*/
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typedef struct Mono_Time Mono_Time;
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typedef uint64_t mono_time_current_time_cb(void *user_data);
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non_null(1) nullable(2, 3)
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Mono_Time *mono_time_new(const Memory *mem, mono_time_current_time_cb *current_time_callback, void *user_data);
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non_null(1) nullable(2)
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void mono_time_free(const Memory *mem, Mono_Time *mono_time);
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/**
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* Update mono_time; subsequent calls to mono_time_get or mono_time_is_timeout
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* will use the time at the call to mono_time_update.
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*/
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non_null()
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void mono_time_update(Mono_Time *mono_time);
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/**
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* Return unix time since epoch in seconds.
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*/
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non_null()
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uint64_t mono_time_get(const Mono_Time *mono_time);
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/**
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* Return true iff timestamp is at least timeout seconds in the past.
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*/
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non_null()
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bool mono_time_is_timeout(const Mono_Time *mono_time, uint64_t timestamp, uint64_t timeout);
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/**
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* Return current monotonic time in milliseconds (ms). The starting point is
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* unspecified.
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*/
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non_null()
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uint64_t current_time_monotonic(Mono_Time *mono_time);
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/**
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* Override implementation of `current_time_monotonic()` (for tests).
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*
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* The caller is obligated to ensure that `current_time_monotonic()` continues
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* to increase monotonically.
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*/
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non_null(1) nullable(2, 3)
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void mono_time_set_current_time_callback(Mono_Time *mono_time,
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mono_time_current_time_cb *current_time_callback, void *user_data);
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#ifdef __cplusplus
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}
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#endif
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#endif // C_TOXCORE_TOXCORE_MONO_TIME_H
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