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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2020 The TokTok team.
* Copyright © 2014 Tox project.
*/
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
#if !defined(OS_WIN32) && (defined(_WIN32) || defined(__WIN32__) || defined(WIN32))
#define OS_WIN32
#endif
#include "mono_time.h"
#ifdef OS_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#ifdef __APPLE__
#include <mach/clock.h>
#include <mach/mach.h>
#endif
#ifndef OS_WIN32
#include <sys/time.h>
#endif
#include <assert.h>
#include <pthread.h>
#include <stdlib.h>
#include <time.h>
#include "ccompat.h"
/** don't call into system billions of times for no reason */
struct Mono_Time {
uint64_t cur_time;
uint64_t base_time;
#ifdef OS_WIN32
/* protect `last_clock_update` and `last_clock_mono` from concurrent access */
pthread_mutex_t last_clock_lock;
uint32_t last_clock_mono;
bool last_clock_update;
#endif
#ifndef ESP_PLATFORM
/* protect `time` from concurrent access */
pthread_rwlock_t *time_update_lock;
#endif
mono_time_current_time_cb *current_time_callback;
void *user_data;
};
#ifdef OS_WIN32
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
Mono_Time *const mono_time = (Mono_Time *)user_data;
/* Must hold mono_time->last_clock_lock here */
/* GetTickCount provides only a 32 bit counter, but we can't use
* GetTickCount64 for backwards compatibility, so we handle wraparound
* ourselves.
*/
const uint32_t ticks = GetTickCount();
/* the higher 32 bits count the number of wrap arounds */
uint64_t old_ovf = mono_time->cur_time & ~((uint64_t)UINT32_MAX);
/* Check if time has decreased because of 32 bit wrap from GetTickCount() */
if (ticks < mono_time->last_clock_mono) {
/* account for overflow */
old_ovf += UINT32_MAX + UINT64_C(1);
}
if (mono_time->last_clock_update) {
mono_time->last_clock_mono = ticks;
mono_time->last_clock_update = false;
}
/* splice the low and high bits back together */
return old_ovf + ticks;
}
#else // !OS_WIN32
static uint64_t timespec_to_u64(struct timespec clock_mono)
{
return 1000ULL * clock_mono.tv_sec + (clock_mono.tv_nsec / 1000000ULL);
}
#ifdef __APPLE__
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
struct timespec clock_mono;
clock_serv_t muhclock;
mach_timespec_t machtime;
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &muhclock);
clock_get_time(muhclock, &machtime);
mach_port_deallocate(mach_task_self(), muhclock);
clock_mono.tv_sec = machtime.tv_sec;
clock_mono.tv_nsec = machtime.tv_nsec;
return timespec_to_u64(clock_mono);
}
#else // !__APPLE__
non_null()
static uint64_t current_time_monotonic_default(void *user_data)
{
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
// This assert should always fail. If it does, the fuzzing harness didn't
// override the mono time callback.
assert(user_data == nullptr);
#endif
struct timespec clock_mono;
clock_gettime(CLOCK_MONOTONIC, &clock_mono);
return timespec_to_u64(clock_mono);
}
#endif // !__APPLE__
#endif // !OS_WIN32
Mono_Time *mono_time_new(mono_time_current_time_cb *current_time_callback, void *user_data)
{
Mono_Time *mono_time = (Mono_Time *)calloc(1, sizeof(Mono_Time));
if (mono_time == nullptr) {
return nullptr;
}
#ifndef ESP_PLATFORM
mono_time->time_update_lock = (pthread_rwlock_t *)calloc(1, sizeof(pthread_rwlock_t));
if (mono_time->time_update_lock == nullptr) {
free(mono_time);
return nullptr;
}
if (pthread_rwlock_init(mono_time->time_update_lock, nullptr) < 0) {
free(mono_time->time_update_lock);
free(mono_time);
return nullptr;
}
#endif
mono_time_set_current_time_callback(mono_time, current_time_callback, user_data);
#ifdef OS_WIN32
mono_time->last_clock_mono = 0;
mono_time->last_clock_update = false;
if (pthread_mutex_init(&mono_time->last_clock_lock, nullptr) < 0) {
free(mono_time->time_update_lock);
free(mono_time);
return nullptr;
}
#endif
mono_time->cur_time = 0;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
// Maximum reproducibility. Never return time = 0.
mono_time->base_time = 1;
#else
mono_time->base_time = (uint64_t)time(nullptr) - (current_time_monotonic(mono_time) / 1000ULL);
#endif
mono_time_update(mono_time);
return mono_time;
}
void mono_time_free(Mono_Time *mono_time)
{
if (mono_time == nullptr) {
return;
}
#ifdef OS_WIN32
pthread_mutex_destroy(&mono_time->last_clock_lock);
#endif
#ifndef ESP_PLATFORM
pthread_rwlock_destroy(mono_time->time_update_lock);
free(mono_time->time_update_lock);
#endif
free(mono_time);
}
void mono_time_update(Mono_Time *mono_time)
{
uint64_t cur_time = 0;
#ifdef OS_WIN32
/* we actually want to update the overflow state of mono_time here */
pthread_mutex_lock(&mono_time->last_clock_lock);
mono_time->last_clock_update = true;
#endif
cur_time = mono_time->current_time_callback(mono_time->user_data) / 1000ULL;
cur_time += mono_time->base_time;
#ifdef OS_WIN32
pthread_mutex_unlock(&mono_time->last_clock_lock);
#endif
#ifndef ESP_PLATFORM
pthread_rwlock_wrlock(mono_time->time_update_lock);
#endif
mono_time->cur_time = cur_time;
#ifndef ESP_PLATFORM
pthread_rwlock_unlock(mono_time->time_update_lock);
#endif
}
uint64_t mono_time_get(const Mono_Time *mono_time)
{
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
// Fuzzing is only single thread for now, no locking needed */
return mono_time->cur_time;
#else
#ifndef ESP_PLATFORM
pthread_rwlock_rdlock(mono_time->time_update_lock);
#endif
const uint64_t cur_time = mono_time->cur_time;
#ifndef ESP_PLATFORM
pthread_rwlock_unlock(mono_time->time_update_lock);
#endif
return cur_time;
#endif
}
bool mono_time_is_timeout(const Mono_Time *mono_time, uint64_t timestamp, uint64_t timeout)
{
return timestamp + timeout <= mono_time_get(mono_time);
}
void mono_time_set_current_time_callback(Mono_Time *mono_time,
mono_time_current_time_cb *current_time_callback, void *user_data)
{
if (current_time_callback == nullptr) {
mono_time->current_time_callback = current_time_monotonic_default;
mono_time->user_data = mono_time;
} else {
mono_time->current_time_callback = current_time_callback;
mono_time->user_data = user_data;
}
}
/**
* Return current monotonic time in milliseconds (ms). The starting point is
* unspecified.
*/
uint64_t current_time_monotonic(Mono_Time *mono_time)
{
/* For WIN32 we don't want to change overflow state of mono_time here */
#ifdef OS_WIN32
/* We don't want to update the overflow state of mono_time here,
* but must protect against other threads */
pthread_mutex_lock(&mono_time->last_clock_lock);
#endif
const uint64_t cur_time = mono_time->current_time_callback(mono_time->user_data);
#ifdef OS_WIN32
pthread_mutex_unlock(&mono_time->last_clock_lock);
#endif
return cur_time;
}
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