| commit | 9780a94e21e11d441d63cdb257ffb971d1ec448e | [log] [tgz] |
|---|---|---|
| author | Joel Galenson <[email protected]> | Fri Aug 13 01:51:27 2021 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Fri Aug 13 01:51:27 2021 +0000 |
| tree | 6497382f249fbcdca1698acf20570e87816cea15 | |
| parent | a18edb3289aec2ac3b8adcc24ddf8c70b717a0bc [diff] | |
| parent | dc4f7a4c49894b4a3828540fdd5b6ba30a5d06b9 [diff] |
Upgrade rust/crates/instant to 0.1.10 am: 0228b9e3fe am: dc4f7a4c49 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/instant/+/1790989 Change-Id: Ica58b2389af003bcf302acb833002123bdb6a21d
If you call std::time::Instant::now() on a WASM platform, it will panic. This crate provides a partial replacement for std::time::Instant that works on WASM too. This defines the type instant::Instant which is:
wasm32-unknown-unknown or wasm32-unknown-asmjs and you enabled either the stdweb or the wasm-bindgen feature. This emulation is based on the javascript performance.now() function.std::time::Instant otherwise.Note that even if the stdweb or wasm-bindgen feature is enabled, this crate will continue to rely on std::time::Instant as long as you are not targeting wasm32. This allows for portable code that will work on both native and WASM platforms.
now.By enabling the feature now the function instant::now() will be exported and will either:
performance.now() when compiling for a WASM platform with the features stdweb or wasm-bindgen enabled, or using a custom javascript function.time::precise_time_s() * 1000.0 otherwise.The result is expressed in milliseconds.
instant for a native platform.Cargo.toml:
[dependencies] instant = "0.1"
main.rs:
fn main() { // Will be the same as `std::time::Instant`. let now = instant::Instant::new(); }
instant for a WASM platform.This example shows the use of the stdweb feature. It would be similar with wasm-bindgen.
Cargo.toml:
[dependencies] instant = { version = "0.1", features = [ "stdweb" ] }
main.rs:
fn main() { // Will emulate `std::time::Instant` based on `performance.now()`. let now = instant::Instant::new(); }
instant for a WASM platform where performance.now() is not available.This example shows the use of the inaccurate feature.
Cargo.toml:
[dependencies] instant = { version = "0.1", features = [ "wasm-bindgen", "inaccurate" ] }
main.rs:
fn main() { // Will emulate `std::time::Instant` based on `Date.now()`. let now = instant::Instant::new(); }
instant for any platform enabling a feature transitively.Cargo.toml:
[features] stdweb = [ "instant/stdweb" ] wasm-bindgen = [ "instant/wasm-bindgen" ] [dependencies] instant = "0.1"
lib.rs:
fn my_function() { // Will select the proper implementation depending on the // feature selected by the user. let now = instant::Instant::new(); }
now.Cargo.toml:
[features] stdweb = [ "instant/stdweb" ] wasm-bindgen = [ "instant/wasm-bindgen" ] [dependencies] instant = { version = "0.1", features = [ "now" ] }
lib.rs:
fn my_function() { // Will select the proper implementation depending on the // feature selected by the user. let now_instant = instant::Instant::new(); let now_milliseconds = instant::now(); // In milliseconds. }
now without stdweb or wasm-bindgen.Cargo.toml:
[dependencies] instant = { version = "0.", features = [ "now" ] }
lib.rs:
fn my_function() { // Will use the 'now' javascript implementation. let now_instant = instant::Instant::new(); let now_milliseconds = instant::now(); // In milliseconds. }
javascript WASM bindings file:
function now() { return Date.now() / 1000.0; }