1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119
// 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
///
/// Previous rust versions panicked when the current time was earlier than self. Currently this
/// method returns a Duration of zero in that case. Future versions may reintroduce the panic.
/// See [Monotonicity].
///
/// [Monotonicity]: Instant#monotonicity
///
/// # 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 might not always succeed. If successful, <code>[Ok]\([Duration])</code> 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)
}
}