| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| use crate::time::{Instant, SystemTime, SystemTimeError, Duration}; |
| |
| pub trait InstantEx { |
| fn now() -> Instant; |
| fn elapsed(&self) -> Duration; |
| } |
| |
| impl InstantEx for Instant { |
| /// Returns an instant corresponding to "now". |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::time::Instant; |
| /// use std::untrusted::time::InstantEx; |
| /// |
| /// let now = Instant::now(); |
| /// ``` |
| #[must_use] |
| fn now() -> Instant { |
| Instant::_now() |
| } |
| |
| /// Returns the amount of time elapsed since this instant was created. |
| /// |
| /// # Panics |
| /// |
| /// This function may panic if the current time is earlier than this |
| /// instant, which is something that can happen if an `Instant` is |
| /// produced synthetically. |
| /// |
| /// # Examples |
| /// |
| /// ```no_run |
| /// use std::thread::sleep; |
| /// use std::time::{Duration, Instant}; |
| /// use std::untrusted::time::InstantEx; |
| /// |
| /// let instant = Instant::now(); |
| /// let three_secs = Duration::from_secs(3); |
| /// sleep(three_secs); |
| /// assert!(instant.elapsed() >= three_secs); |
| /// ``` |
| #[must_use] |
| fn elapsed(&self) -> Duration { |
| Instant::_now() - *self |
| } |
| } |
| |
| pub trait SystemTimeEx { |
| fn now() -> SystemTime; |
| fn elapsed(&self) -> Result<Duration, SystemTimeError>; |
| } |
| |
| impl SystemTimeEx for SystemTime { |
| /// Returns the system time corresponding to "now". |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::time::SystemTime; |
| /// use std::untrusted::time::SystemTimeEx; |
| /// |
| /// let sys_time = SystemTime::now(); |
| /// ``` |
| #[must_use] |
| fn now() -> SystemTime { |
| SystemTime::_now() |
| } |
| |
| /// Returns the difference between the clock time when this |
| /// system time was created, and the current clock time. |
| /// |
| /// This function may fail as the underlying system clock is susceptible to |
| /// drift and updates (e.g., the system clock could go backwards), so this |
| /// function may not always succeed. If successful, [`Ok`]`(`[`Duration`]`)` is |
| /// returned where the duration represents the amount of time elapsed from |
| /// this time measurement to the current time. |
| /// |
| /// To measure elapsed time reliably, use [`Instant`] instead. |
| /// |
| /// Returns an [`Err`] if `self` is later than the current system time, and |
| /// the error contains how far from the current system time `self` is. |
| /// |
| /// # Examples |
| /// |
| /// ```no_run |
| /// use std::thread::sleep; |
| /// use std::time::{Duration, SystemTime}; |
| /// use std::untrusted::time::SystemTimeEx; |
| /// |
| /// let sys_time = SystemTime::now(); |
| /// let one_sec = Duration::from_secs(1); |
| /// sleep(one_sec); |
| /// assert!(sys_time.elapsed().unwrap() >= one_sec); |
| /// ``` |
| fn elapsed(&self) -> Result<Duration, SystemTimeError> { |
| SystemTime::_now().duration_since(*self) |
| } |
| } |