我正在尝试在 rust 中设置一个简单的计时器，它以一定的频率返回 true。
#[derive(Clone, Debug)]
pub struct IntervalTimer {
pub period: Duration,
pub delta: Instant,
}
impl IntervalTimer {
pub fn new(period: Duration) -> Self {
let delta = Instant::now();
Self { period, delta }
}
/// Returns true if the interval between calls has exceeded the period
pub fn ready(&mut self) -> bool {
if self.delta.elapsed() < self.period {
false
} else {
self.delta = self.delta + self.period;
true
}
}
}
std::time::Instant出于某种原因，在任务内使用时，这似乎总是会出现恐慌rayon（如果重要的话，在 Legion ECS 中运行）。
这是唯一一篇包含相同信息的帖子，但归结为使用了不寻常的内核。我只是使用 Ubuntu 18.04，没有任何异常设置。
此外，我尝试了多台机器，但代码出现了同样的错误。
这与使用std::time::Instant和有关rayon吗？
thread 'thread '<unnamed><unnamed>' panicked at '' panicked at 'supplied instant is later than self', src/libstd/time.rs:263:9
stack backtrace:
supplied instant is later than self', src/libstd/time.rs:263:9
0: 0x5574c8e3b9e4 - backtrace::backtrace::libunwind::trace::hc1c4a1d8ad423b97
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: 0x5574c8e3b9e4 - backtrace::backtrace::trace_unsynchronized::h82274781060cb056
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: 0x5574c8e3b9e4 - std::sys_common::backtrace::_print_fmt::h2a45d89b653a4da8
at src/libstd/sys_common/backtrace.rs:78
3: 0x5574c8e3b9e4 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h41a0a93ab85e6aa1
at src/libstd/sys_common/backtrace.rs:59
4: 0x5574c8e64b2c - core::fmt::write::hdaea18585065a96d
at src/libcore/fmt/mod.rs:1069
5: 0x5574c8e34743 - std::io::Write::write_fmt::h0cea70c809005252
at src/libstd/io/mod.rs:1504
6: 0x5574c8e3e7a5 - std::sys_common::backtrace::_print::hd95f9978cc145ca4
at src/libstd/sys_common/backtrace.rs:62
7: 0x5574c8e3e7a5 - std::sys_common::backtrace::print::hfb25ca2291be47d0
at src/libstd/sys_common/backtrace.rs:49
8: 0x5574c8e3e7a5 - std::panicking::default_hook::{{closure}}::h44f76cee5dc8591c
at src/libstd/panicking.rs:198
9: 0x5574c8e3e4e2 - std::panicking::default_hook::h198e1a712910f1e6
at src/libstd/panicking.rs:218
10: 0x5574c8e3ee02 - std::panicking::rust_panic_with_hook::hc0b4730bb8013f9d
at src/libstd/panicking.rs:511
11: 0x5574c8e3e9eb - rust_begin_unwind
at src/libstd/panicking.rs:419
12: 0x5574c8e62921 - core::panicking::panic_fmt::h1ac71ad045d55416
at src/libcore/panicking.rs:111
13: 0x5574c8e626b3 - core::option::expect_failed::h7baa1c60813ff0e3
at src/libcore/option.rs:1260
14: 0x5574c8e3b3e5 - core::option::Option<T>::expect::h306e330bd810d3ba
at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libcore/option.rs:347
15: 0x5574c8e3b3e5 - std::time::Instant::duration_since::hba1f841dfadd1cd2
at src/libstd/time.rs:263
16: 0x5574c8e3b3e5 - <std::time::Instant as core::ops::arith::Sub>::sub::h73cd3ea7a55658e1
at src/libstd/time.rs:390
17: 0x5574c8e3b3e5 - std::time::Instant::elapsed::h67e85e1d84cb14d0
at src/libstd/time.rs:327
18: 0x5574c8bfe09f - locus_sim_engine::utils::interval_timer::IntervalTimer::ready::h7569661c5fd39089
at src/utils/interval_timer.rs:17
19: 0x5574c8bfe09f - locus_sim_engine::system::laser_scan::single_laser_scan::h671b01a54874470e
at src/system/laser_scan.rs:63
20: 0x5574c8bf074d - locus_sim_engine::system::laser_scan::laser_scan::{{closure}}::h1deba93ec7418c4d
at src/system/laser_scan.rs:50
21: 0x5574c8bf074d - core::ops::function::impls::<impl core::ops::function::Fn<A> for &F>::call::h96b179e6c0dd1ac0
at /home/michael/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:242
22: 0x5574c8bf074d - core::ops::function::impls::<impl core::ops::function::FnMut<A> for &F>::call_mut::h4f8d7ff151c5feb5
at /home/michael/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:252
23: 0x5574c8a918f8 - <locus_sim_api::motor_server::MotorServer<T> as tower_service::Service<http::request::Request<B>>>::call::{{closure}}::hf5b46adb51805ebe
at /home/michael/locus_dev/src/locus_sim_engine/target/release/build/locus-sim-api-4d28cb656733f563/out/locus_sim_api.rs:531
24: 0x5574c8a918f8 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h9798dbde38a1f607
at /home/michael/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/future/mod.rs:66
25: 0x5574c8a104ad - <core::pin::Pin<P> as core::future::future::Future>::poll::h6aa9c7207adebc07
at /home/michael/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/future/future.rs:118
26: 0x5574c8a104ad - <F as futures_core::future::TryFuture>::try_poll::h5633e6d6a71350d5
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.5/src/future.rs:83
27: 0x5574c8a104ad - <futures_util::future::try_future::into_future::IntoFuture<Fut> as core::future::future::Future>::poll::h20812bb48a44deb6
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/try_future/into_future.rs:31
28: 0x5574c8a104ad - <futures_util::future::future::map::Map<Fut,F> as core::future::future::Future>::poll::h7de76b6b06dabc84
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/future/map.rs:67
29: 0x5574c8a10298 - <futures_util::future::future::Map<Fut,F> as core::future::future::Future>::poll::h87636451ef52bf16
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
30: 0x5574c8a10298 - <futures_util::future::try_future::MapErr<Fut,F> as core::future::future::Future>::poll::hf361a24bd15b64de
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
31: 0x5574c8a10298 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h3ba6a79df0fece24
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/either.rs:65
32: 0x5574c8a10298 - <F as futures_core::future::TryFuture>::try_poll::h5d9826bce7bec57c
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.5/src/future.rs:83
33: 0x5574c8a10298 - <futures_util::future::try_future::into_future::IntoFuture<Fut> as core::future::future::Future>::poll::h8cc4e2435674ca81
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/try_future/into_future.rs:31
34: 0x5574c8a10298 - <futures_util::future::future::map::Map<Fut,F> as core::future::future::Future>::poll::h3a97595fa35bf6b4
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/future/map.rs:67
35: 0x5574c8a10645 - <futures_util::future::future::Map<Fut,F> as core::future::future::Future>::poll::h1f03e91c826fb89f
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
36: 0x5574c8a10645 - <futures_util::future::try_future::MapErr<Fut,F> as core::future::future::Future>::poll::hbb30c6370d1ad4dd
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
37: 0x5574c8a10645 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h45a493d70ab6cb16
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/either.rs:66
38: 0x5574c8a10645 - <F as futures_core::future::TryFuture>::try_poll::h3218040a42683b8c
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.5/src/future.rs:83
39: 0x5574c8a10645 - <futures_util::future::try_future::into_future::IntoFuture<Fut> as core::future::future::Future>::poll::hffacf042cca96add
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/try_future/into_future.rs:31
40: 0x5574c8a10645 - <futures_util::future::future::map::Map<Fut,F> as core::future::future::Future>::poll::hd3999158d5641280
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/future/map.rs:67
41: 0x5574c8a0fca0 - <futures_util::future::future::Map<Fut,F> as core::future::future::Future>::poll::he914f5b3eab7d7ff
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
42: 0x5574c8a0fca0 - <futures_util::future::try_future::MapErr<Fut,F> as core::future::future::Future>::poll::haa236b3c8a953e0b
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
43: 0x5574c8a0fca0 - <futures_util::future::either::Either<A,B> as core::future::future::Future>::poll::h79e46a6c42aa3fc0
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/either.rs:66
44: 0x5574c8a0fca0 - <F as futures_core::future::TryFuture>::try_poll::h11442ab0450f9aba
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-core-0.3.5/src/future.rs:83
45: 0x5574c8a0fca0 - <futures_util::future::try_future::into_future::IntoFuture<Fut> as core::future::future::Future>::poll::h4514bbaa544f1a54
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/try_future/into_future.rs:31
46: 0x5574c8a0fca0 - <futures_util::future::future::map::Map<Fut,F> as core::future::future::Future>::poll::h3467a48e5d1b449e
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/future/map.rs:67
47: 0x5574c8a0f5e5 - <futures_util::future::future::Map<Fut,F> as core::future::future::Future>::poll::hc132b12a66e846ba
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107
48: 0x5574c8a0f5e5 - <futures_util::future::try_future::MapErr<Fut,F> as core::future::future::Future>::poll::hbbbc3932986b69ae
at /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/lib.rs:107