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I'm trying to get a simple timer set up in rust that returns true at a certain frequency.
#[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
}
}
}
For some reason, this seems to consistently panic when using std::time::Instant within rayon tasks (running in Legion ECS if that matters).
This was the only other post with information in it that gives the same info but it came down to using an unusual kernel. I'm just using Ubuntu 18.04 with nothing unusual set up.
Additionally, I've tried multiple machines but the same error occurs witht he code.
Is this something to do with using std::time::Instant and rayon?
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
877
Your code is completely correct. You should submit a bug to https://github.com/rust-lang/rust. Windows and ARM Linux already have workarounds for similar issues.
162
My guess is that the task is jumping around to different cores and their clocks are not in lockstep, thus causing the non-monotonicity.
elapsed() just calculates now() - *self So instead of checking elapsed() > period check if now() > delta + period
2
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