Commit 2145271
Remove thread pool and provide a single function for spawning new threads
Changed files (27)
deletedexamples/raytrace-parallel/Cargo.lockdeletedexamples/raytrace-parallel/Cargo.tomldeletedexamples/raytrace-parallel/LICENSE-APACHEdeletedexamples/raytrace-parallel/README.mddeletedexamples/raytrace-parallel/build.shdeletedexamples/raytrace-parallel/rust-toolchain.tomldeletedexamples/raytrace-parallel/server.pydeletedexamples/raytrace-parallel/src/lib.rsdeletedexamples/raytrace-parallel/src/main_component.rsdeletedexamples/raytrace-parallel/src/pool.rsdeletedexamples/raytrace-parallel/static/index.htmldeletedexamples/raytrace-parallel/static/index.jsdeletedexamples/raytrace-parallel/static/worker.jsaddedexamples/threads/Cargo.lockaddedexamples/threads/Cargo.tomladdedexamples/threads/LICENSE-APACHEaddedexamples/threads/README.mdaddedexamples/threads/build.shaddedexamples/threads/run.shaddedexamples/threads/rust-toolchain.tomladdedexamples/threads/server.pyaddedexamples/threads/src/lib.rsaddedexamples/threads/src/main_component.rsaddedexamples/threads/src/thread.rsaddedexamples/threads/static/index.htmladdedexamples/threads/static/index.jsaddedexamples/threads/static/worker.js
Diff
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"registry+https://github.com/rust-lang/crates.io-index"-checksum = "c62df1340f32221cb9c54d6a27b030e3dba64361d4a95bed55f9aacb44da291d"-dependencies = [- "js-sys",- "wasm-bindgen",-]--[[package]]-name = "wasm-bindgen-macro"-version = "0.2.126"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "167ce5e579f6bcf889c4f7175a8a5a585de84e8ff93976ce393efa5f2837aab1"-dependencies = [- "quote",- "wasm-bindgen-macro-support",-]--[[package]]-name = "wasm-bindgen-macro-support"-version = "0.2.126"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "f3997c7839262f4ef12cf90b818d6340c18e80f263f1a94bf157d0ec4420380e"-dependencies = [- "bumpalo",- "proc-macro2",- "quote",- "syn 2.0.118",- "wasm-bindgen-shared",-]--[[package]]-name = "wasm-bindgen-shared"-version = "0.2.126"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "dc1b4cb0cc549fcf58d7dfc081778139b3d283a081644e833e84682ad71cea24"-dependencies = [- "unicode-ident",-]--[[package]]-name = "web-sys"-version = "0.3.103"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "8622dcb61c0bcc9fffa6938bed81210af2da9a7e4a1a834b2e37a59b6dfb6141"-dependencies = [- "js-sys",- "wasm-bindgen",-]--[[package]]-name = "winnow"-version = "0.7.15"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "df79d97927682d2fd8adb29682d1140b343be4ac0f08fd68b7765d9c059d3945"-dependencies = [- "memchr",-]--[[package]]-name = "zmij"-version = "1.0.21"-source = "registry+https://github.com/rust-lang/crates.io-index"-checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"deleted file mode 100644@@ -1,43 +0,0 @@-[package]-authors = ["The wasm-bindgen Developers"]-edition = "2021"-name = "raytrace-parallel"-publish = false-version = "0.0.0"--[lib]-crate-type = ["cdylib"]--[dependencies]-console_error_panic_hook = "0.1"-futures-channel-preview = "0.3.0-alpha.18"-js-sys = "0.3.103"-serde-wasm-bindgen = "0.6"-wasm-bindgen = "0.2.126"-wasm-bindgen-futures = "0.4.76"--web-sys = { version = "0.3.103", features = [- "ErrorEvent",- "Event",- "Navigator",- "Window",- "Worker",- "DedicatedWorkerGlobalScope",- "MessageEvent",- "Element",- "HtmlElement",- "NodeList",- "CustomElementRegistry",- "ElementDefinitionOptions"-] }--kaja-web = { path = "../.." }-kaja-web-component = { path = "../../../kaja-web-component" }-gloo = { version = "0.12", features = ["futures"] }-kaja-html-macro = "1.0.4"-serde = { version = "1.0.228", features = ["derive"] }-serde_json = "1.0.150"-uuid = { version = "1.23.2", features = ["js", "v4"] }-inventory = "0.3.24"-gloo-timers = { version = "0.4.0", features = ["futures"] }-async-channel = "2"deleted file mode 100644@@ -1,201 +0,0 @@- Apache License- Version 2.0, January 2004- http://www.apache.org/licenses/--TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION--1. 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However, in accepting such obligations, You may act only- on Your own behalf and on Your sole responsibility, not on behalf- of any other Contributor, and only if You agree to indemnify,- defend, and hold each Contributor harmless for any liability- incurred by, or claims asserted against, such Contributor by reason- of your accepting any such warranty or additional liability.--END OF TERMS AND CONDITIONS--APPENDIX: How to apply the Apache License to your work.-- To apply the Apache License to your work, attach the following- boilerplate notice, with the fields enclosed by brackets "[]"- replaced with your own identifying information. (Don't include- the brackets!) The text should be enclosed in the appropriate- comment syntax for the file format. We also recommend that a- file or class name and description of purpose be included on the- same "printed page" as the copyright notice for easier- identification within third-party archives.--Copyright [yyyy] [name of copyright owner]--Licensed 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.deleted file mode 100644@@ -1,7 +0,0 @@-# Example--Run build.sh to build the example.--This example requires the nightly version of Rust. See rust-toolchain.toml--The code is based on the raytrace example in the wasm-bindgen crate. License: Apache-2.0. Original author: Alex Crichton et. al.deleted file mode 100755@@ -1,13 +0,0 @@-#!/bin/sh-set -eu--mkdir -p pkg--CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUSTFLAGS="-Ctarget-feature=+atomics -Clink-args=--shared-memory -Clink-args=--max-memory=1073741824 -Clink-args=--import-memory -Clink-args=--export=__heap_base -Clink-args=--export=__wasm_init_tls -Clink-args=--export=__tls_size -Clink-args=--export=__tls_align -Clink-args=--export=__tls_base" cargo +nightly build -Zbuild-std=std,panic_abort --target wasm32-unknown-unknown-wasm-bindgen target/wasm32-unknown-unknown/debug/raytrace_parallel.wasm --target no-modules --out-dir ./pkg--cp static/index.html ./pkg/-cp static/worker.js ./pkg/-cp static/index.js ./pkg/--python3 server.pydeleted file mode 100644@@ -1,5 +0,0 @@-[toolchain]-channel = "nightly"-components = ["rust-src"]-profile = "minimal"-targets = ["wasm32-unknown-unknown"]deleted file mode 100755@@ -1,20 +0,0 @@-#!/usr/bin/env python3-from http.server import HTTPServer, SimpleHTTPRequestHandler, test-from pathlib import Path-import sys--PKG_DIR = Path(__file__).resolve().parent / 'pkg'--class RequestHandler(SimpleHTTPRequestHandler):- def __init__(self, *args, **kwargs):- super().__init__(*args, directory=str(PKG_DIR), **kwargs)-- def end_headers(self):- self.send_header('Cross-Origin-Opener-Policy', 'same-origin')- self.send_header('Cross-Origin-Embedder-Policy', 'require-corp')- SimpleHTTPRequestHandler.end_headers(self)--if __name__ == '__main__':- port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000- print(f"Serving {PKG_DIR} at http://localhost:{port}/")- test(RequestHandler, HTTPServer, port=port, bind='127.0.0.1')deleted file mode 100644@@ -1,29 +0,0 @@-use kaja_web::prelude::*;-use wasm_bindgen::{JsValue, prelude::wasm_bindgen};--macro_rules! console_log {- ($($t:tt)*) => (crate::log(&format_args!($($t)*).to_string()))-}--#[wasm_bindgen]-extern "C" {- #[wasm_bindgen(js_namespace = console)]- pub(crate) fn log(s: &str);- #[wasm_bindgen(js_namespace = console, js_name = log)]- pub(crate) fn logv(x: &JsValue);-}--mod main_component;-mod pool;--#[wasm_bindgen(start)]-pub fn init() {- log!("Starting");-- std::panic::set_hook(Box::new(console_error_panic_hook::hook));- console_error_panic_hook::set_once();-- log!("Init callbacks");- init_callbacks();- log!("Init complete");-}deleted file mode 100644@@ -1,81 +0,0 @@-use kaja_web::prelude::*;-use std::time::Duration;--thread_local! {- static BACKGROUND_POOL: std::cell::RefCell<Option<crate::pool::WorkerPool>> =- const { std::cell::RefCell::new(None) };-}--#[component("main-component")]-struct Main {- test: bool,-}--impl Component for Main {- fn connected(id: &str) {- start_background_thread(&id);- }-- fn update(id: &str) {- log!(- "Update from background thread, running on the UI thread:",- id- );-- let Some(handle) = Self::get_component(id) else {- error!("Main component not found:", id);- return;- };-- let Some(element) = get_element_by_id(id) else {- error!("Element not found:", id);- return;- };-- let mut component = handle.lock().unwrap();- component.test = !component.test;- component.render(&element);- }-}--impl Main {- fn render(&self, element: &HtmlElement) {- element.set_inner_text(&self.test.to_string());- }-}--fn start_background_thread(id: &str) {- let component_id = id.to_string();-- BACKGROUND_POOL.with(|pool_slot| {- if pool_slot.borrow().is_none() {- match crate::pool::WorkerPool::new(1) {- Ok(pool) => {- *pool_slot.borrow_mut() = Some(pool);- }- Err(err) => {- error!("Failed to create worker pool for background thread");- crate::logv(&err);- return;- }- }- }-- let pool_ref = pool_slot.borrow();- let pool = pool_ref.as_ref().unwrap();-- if let Err(err) = pool.run(move || {- loop {- Main::post_ui_thread_update(component_id.as_str());- std::thread::sleep(Duration::from_millis(1000));-- // this a background thread, so:- // try_inner_html("#test", "<b>INNER_HTML</b>");- // will not update the DOM. Only the UI thread can do that.- }- }) {- error!("Failed to spawn background worker task");- crate::logv(&err);- }- });-}deleted file mode 100644@@ -1,219 +0,0 @@-// Silences warnings from the compiler about Work.func and child_entry_point-// being unused when the target is not wasm.-#![cfg_attr(not(target_arch = "wasm32"), allow(dead_code))]--//! A small module that's intended to provide an example of creating a pool of-//! web workers which can be used to execute `rayon`-style work.--use std::cell::RefCell;-use std::rc::Rc;-use wasm_bindgen::prelude::*;-use web_sys::{DedicatedWorkerGlobalScope, MessageEvent};-use web_sys::{ErrorEvent, Event, Worker};--#[wasm_bindgen]-pub struct WorkerPool {- state: Rc<PoolState>,-}--struct PoolState {- workers: RefCell<Vec<Worker>>,- callback: Closure<dyn FnMut(Event)>,-}--struct Work {- func: Box<dyn FnOnce() + Send>,-}--#[wasm_bindgen]-impl WorkerPool {- /// Creates a new `WorkerPool` which immediately creates `initial` workers.- ///- /// The pool created here can be used over a long period of time, and it- /// will be initially primed with `initial` workers. Currently workers are- /// never released or gc'd until the whole pool is destroyed.- ///- /// # Errors- ///- /// Returns any error that may happen while a JS web worker is created and a- /// message is sent to it.- #[wasm_bindgen(constructor)]- pub fn new(initial: usize) -> Result<WorkerPool, JsValue> {- let pool = WorkerPool {- state: Rc::new(PoolState {- workers: RefCell::new(Vec::with_capacity(initial)),- callback: Closure::new(|event: Event| {- console_log!("unhandled event: {}", event.type_());- crate::logv(&event);- }),- }),- };- for _ in 0..initial {- let worker = pool.spawn()?;- pool.state.push(worker);- }-- Ok(pool)- }-- /// Unconditionally spawns a new worker- ///- /// The worker isn't registered with this `WorkerPool` but is capable of- /// executing work for this Wasm module.- ///- /// # Errors- ///- /// Returns any error that may happen while a JS web worker is created and a- /// message is sent to it.- fn spawn(&self) -> Result<Worker, JsValue> {- console_log!("spawning new worker");- // TODO: what to do about `./worker.js`:- //- // * the path is only known by the bundler. How can we, as a- // library, know what's going on?- // * How do we not fetch a script N times? It internally then- // causes another script to get fetched N times...- let worker = Worker::new("./worker.js")?;-- // With a worker spun up send it the module/memory so it can start- // instantiating the Wasm module. 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This method is- /// used for all spawned workers to ensure that when the work is finished- /// the worker is reclaimed back into this pool.- fn reclaim_on_message(&self, worker: Worker) {- let state = Rc::downgrade(&self.state);- let worker2 = worker.clone();- let reclaim_slot = Rc::new(RefCell::new(None));- let slot2 = reclaim_slot.clone();- let reclaim = Closure::<dyn FnMut(_)>::new(move |event: Event| {- if let Some(error) = event.dyn_ref::<ErrorEvent>() {- console_log!("error in worker: {}", error.message());- // TODO: this probably leaks memory somehow? It's sort of- // unclear what to do about errors in workers right now.- return;- }-- // If this is a completion event then can deallocate our own- // callback by clearing out `slot2` which contains our own closure.- if let Some(_msg) = event.dyn_ref::<MessageEvent>() {- if let Some(state) = state.upgrade() {- state.push(worker2.clone());- }- *slot2.borrow_mut() = None;- return;- }-- console_log!("unhandled event: {}", event.type_());- crate::logv(&event);- // TODO: like above, maybe a memory leak here?- });- worker.set_onmessage(Some(reclaim.as_ref().unchecked_ref()));- *reclaim_slot.borrow_mut() = Some(reclaim);- }-}--impl WorkerPool {- /// Executes `f` in a web worker.- ///- /// This pool manages a set of web workers to draw from, and `f` will be- /// spawned quickly into one if the worker is idle. If no idle workers are- /// available then a new web worker will be spawned.- ///- /// Once `f` returns the worker assigned to `f` is automatically reclaimed- /// by this `WorkerPool`. This method provides no method of learning when- /// `f` completes, and for that you'll need to use `run_notify`.- ///- /// # Errors- ///- /// If an error happens while spawning a web worker or sending a message to- /// a web worker, that error is returned.- pub fn run(&self, f: impl FnOnce() + Send + 'static) -> Result<(), JsValue> {- let worker = self.execute(f)?;- self.reclaim_on_message(worker);- Ok(())- }-}--impl PoolState {- fn push(&self, worker: Worker) {- worker.set_onmessage(Some(self.callback.as_ref().unchecked_ref()));- worker.set_onerror(Some(self.callback.as_ref().unchecked_ref()));- let mut workers = self.workers.borrow_mut();- for prev in workers.iter() {- let prev: &JsValue = prev;- let worker: &JsValue = &worker;- assert!(prev != worker);- }- workers.push(worker);- }-}--/// Entry point invoked by `worker.js`, a bit of a hack but see the "TODO" above-/// about `worker.js` in general.-#[wasm_bindgen]-pub fn child_entry_point(ptr: u32) -> Result<(), JsValue> {- let ptr = unsafe { Box::from_raw(ptr as *mut Work) };- let global = js_sys::global().unchecked_into::<DedicatedWorkerGlobalScope>();- (ptr.func)();- global.post_message(&JsValue::undefined())?;- Ok(())-}deleted file mode 100644@@ -1,10 +0,0 @@-<html>- <head>- <title>Wasm Threads</title>- </head>- <body>- Known: <main-component></main-component>- <script src='raytrace_parallel.js'></script>- <script src='index.js'></script>- </body>-</html>deleted file mode 100644@@ -1,19 +0,0 @@-function loadWasm() {- if (typeof SharedArrayBuffer !== 'function') {- console.error('this browser does not have SharedArrayBuffer support enabled' + '\n\n' + msg);- return- }- // Test for bulk memory operations with passive data segments- // (module (memory 1) (data passive ""))- const buf = new Uint8Array([0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,- 0x05, 0x03, 0x01, 0x00, 0x01, 0x0b, 0x03, 0x01, 0x01, 0x00]);- if (!WebAssembly.validate(buf)) {- console.error('This browser does not support passive Wasm memory, Background threads will not work' + '\n\n' + msg);- return- }-- wasm_bindgen()- .catch(console.error);-}--loadWasm();deleted file mode 100644@@ -1,25 +0,0 @@-// synchronously, using the browser, import out shim JS scripts-importScripts('raytrace_parallel.js');--// Wait for the main thread to send us the shared module/memory. 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version = "0.3.103", features = [+ "ErrorEvent",+ "Event",+ "Navigator",+ "Window",+ "Worker",+ "DedicatedWorkerGlobalScope",+ "MessageEvent",+ "Element",+ "HtmlElement",+ "NodeList",+ "CustomElementRegistry",+ "ElementDefinitionOptions"+] }++kaja-web = { path = "../.." }+kaja-web-component = { path = "../../../kaja-web-component" }+gloo = { version = "0.12", features = ["futures"] }+kaja-html-macro = "1.0.4"+serde = { version = "1.0.228", features = ["derive"] }+serde_json = "1.0.150"+uuid = { version = "1.23.2", features = ["js", "v4"] }+inventory = "0.3.24"+gloo-timers = { version = "0.4.0", features = ["futures"] }+async-channel = "2"new file mode 100644@@ -0,0 +1,201 @@+ Apache License+ Version 2.0, January 2004+ http://www.apache.org/licenses/++TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION++1. 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However, in accepting such obligations, You may act only+ on Your own behalf and on Your sole responsibility, not on behalf+ of any other Contributor, and only if You agree to indemnify,+ defend, and hold each Contributor harmless for any liability+ incurred by, or claims asserted against, such Contributor by reason+ of your accepting any such warranty or additional liability.++END OF TERMS AND CONDITIONS++APPENDIX: How to apply the Apache License to your work.++ To apply the Apache License to your work, attach the following+ boilerplate notice, with the fields enclosed by brackets "[]"+ replaced with your own identifying information. (Don't include+ the brackets!) The text should be enclosed in the appropriate+ comment syntax for the file format. We also recommend that a+ file or class name and description of purpose be included on the+ same "printed page" as the copyright notice for easier+ identification within third-party archives.++Copyright [yyyy] [name of copyright owner]++Licensed 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.new file mode 100644@@ -0,0 +1,20 @@+# Example++Run build.sh to build the example.++This example requires the nightly version of Rust. See rust-toolchain.toml++The more common way to do parallel work in the browser is to use async/await+style code with++```+use wasm_bindgen_futures::spawn_local;++spawn_local(async {+ // your async work here+});+```++See the async example.++The code is based on the raytrace example in the wasm-bindgen crate. License: Apache-2.0. Original author: Alex Crichton et. al.new file mode 100755@@ -0,0 +1,11 @@+#!/bin/sh+set -eu++mkdir -p pkg++CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUSTFLAGS="-Ctarget-feature=+atomics -Clink-args=--shared-memory -Clink-args=--max-memory=1073741824 -Clink-args=--import-memory -Clink-args=--export=__heap_base -Clink-args=--export=__wasm_init_tls -Clink-args=--export=__tls_size -Clink-args=--export=__tls_align -Clink-args=--export=__tls_base" cargo +nightly build -Zbuild-std=std,panic_abort --target wasm32-unknown-unknown+wasm-bindgen target/wasm32-unknown-unknown/debug/raytrace_parallel.wasm --target no-modules --out-dir ./pkg++cp static/index.html ./pkg/+cp static/worker.js ./pkg/+cp static/index.js ./pkg/new file mode 100755@@ -0,0 +1,6 @@+#!/bin/sh+set -eu++./build.sh++python3 server.pynew file mode 100644@@ -0,0 +1,5 @@+[toolchain]+channel = "nightly"+components = ["rust-src"]+profile = "minimal"+targets = ["wasm32-unknown-unknown"]new file mode 100755@@ -0,0 +1,20 @@+#!/usr/bin/env python3+from http.server import HTTPServer, SimpleHTTPRequestHandler, test+from pathlib import Path+import sys++PKG_DIR = Path(__file__).resolve().parent / 'pkg'++class RequestHandler(SimpleHTTPRequestHandler):+ def __init__(self, *args, **kwargs):+ super().__init__(*args, directory=str(PKG_DIR), **kwargs)++ def end_headers(self):+ self.send_header('Cross-Origin-Opener-Policy', 'same-origin')+ self.send_header('Cross-Origin-Embedder-Policy', 'require-corp')+ SimpleHTTPRequestHandler.end_headers(self)++if __name__ == '__main__':+ port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000+ print(f"Serving {PKG_DIR} at http://localhost:{port}/")+ test(RequestHandler, HTTPServer, port=port, bind='127.0.0.1')new file mode 100644@@ -0,0 +1,29 @@+use kaja_web::prelude::*;+use wasm_bindgen::{JsValue, prelude::wasm_bindgen};++macro_rules! console_log {+ ($($t:tt)*) => (crate::log(&format_args!($($t)*).to_string()))+}++#[wasm_bindgen]+extern "C" {+ #[wasm_bindgen(js_namespace = console)]+ pub(crate) fn log(s: &str);+ #[wasm_bindgen(js_namespace = console, js_name = log)]+ pub(crate) fn logv(x: &JsValue);+}++mod main_component;+mod pool;++#[wasm_bindgen(start)]+pub fn init() {+ log!("Starting");++ std::panic::set_hook(Box::new(console_error_panic_hook::hook));+ console_error_panic_hook::set_once();++ log!("Init callbacks");+ init_callbacks();+ log!("Init complete");+}new file mode 100644@@ -0,0 +1,55 @@+use kaja_web::prelude::*;+use std::time::Duration;++#[component("main-component")]+struct Main {+ test: bool,+}++impl Component for Main {+ fn connected(id: &str) {+ start_background_thread(&id);+ }++ fn update(id: &str) {+ log!(+ "Update from background thread, running on the UI thread:",+ id+ );++ let Some(handle) = Self::get_component(id) else {+ error!("Main component not found:", id);+ return;+ };++ let Some(element) = get_element_by_id(id) else {+ error!("Element not found:", id);+ return;+ };++ let mut component = handle.lock().unwrap();+ component.test = !component.test;+ component.render(&element);+ }+}++impl Main {+ fn render(&self, element: &HtmlElement) {+ element.set_inner_text(&self.test.to_string());+ }+}++fn start_background_thread(id: &str) {+ let component_id = id.to_string();++ c rate::thread::spawn(move || {+ loop {+ Main::post_ui_thread_update(component_id.as_str());+ std::thread::sleep(Duration::from_millis(1000));++ // this a background thread, so:+ // try_inner_html("#test", "<b>INNER_HTML</b>");+ // will not update the DOM. Only the UI thread can do that.+ }+ });+}new file mode 100644@@ -0,0 +1,81 @@+// Silences warnings from the compiler about Work.func and child_entry_point+// being unused when the target is not wasm.+#![cfg_attr(not(target_arch = "wasm32"), allow(dead_code))]++use std::cell::RefCell;+use std::rc::Rc;+use wasm_bindgen::prelude::*;+use web_sys::{DedicatedWorkerGlobalScope, MessageEvent};+use web_sys::{ErrorEvent, Event, Worker};++struct Work {+ func: Box<dyn FnOnce() + Send>,+}++fn spawn_worker() -> Result<Worker, JsValue> {+ let worker = Worker::new("./worker.js")?;++ // With a worker spun up send it the module/memory so it can start+ // instantiating the Wasm module. Later it might receive further+ // messages about code to run on the Wasm module.+ let array = js_sys::Array::new();+ array.push(&wasm_bindgen::module());+ array.push(&wasm_bindgen::memory());+ worker.post_message(&array)?;++ Ok(worker)+}++/// Spawns a single standalone worker and runs `f` on it.+pub fn spawn(f: impl FnOnce() + Send + 'static) -> Result<(), JsValue> {+ let worker = spawn_worker()?;++ let worker2 = worker.clone();+ let completion_slot = Rc::new(RefCell::new(None));+ let slot2 = completion_slot.clone();++ let completion = Closure::<dyn FnMut(_)>::new(move |event: Event| {+ if let Some(error) = event.dyn_ref::<ErrorEvent>() {+ console_log!("error in standalone worker: {}", error.message());+ } else if event.dyn_ref::<MessageEvent>().is_none() {+ console_log!("unhandled event: {}", event.type_());+ crate::logv(&event);+ }++ worker2.terminate();+ worker2.set_onmessage(None);+ worker2.set_onerror(None);+ *slot2.borrow_mut() = None;+ });++ worker.set_onmessage(Some(completion.as_ref().unchecked_ref()));+ worker.set_onerror(Some(completion.as_ref().unchecked_ref()));+ *completion_slot.borrow_mut() = Some(completion);++ let work = Box::new(Work { func: Box::new(f) });+ let ptr = Box::into_raw(work);++ match worker.post_message(&JsValue::from(ptr as u32)) {+ Ok(()) => Ok(()),+ Err(e) => {+ unsafe {+ drop(Box::from_raw(ptr));+ }+ worker.terminate();+ worker.set_onmessage(None);+ worker.set_onerror(None);+ *completion_slot.borrow_mut() = None;+ Err(e)+ }+ }+}++/// Entry point invoked by `worker.js`+#[wasm_bindgen]+pub fn child_entry_point(ptr: u32) -> Result<(), JsValue> {+ let ptr = unsafe { Box::from_raw(ptr as *mut Work) };+ let global = js_sys::global().unchecked_into::<DedicatedWorkerGlobalScope>();+ (ptr.func)();+ global.post_message(&JsValue::undefined())?;+ Ok(())+}new file mode 100644@@ -0,0 +1,10 @@+<html>+ <head>+ <title>Wasm Threads</title>+ </head>+ <body>+ Known: <main-component></main-component>+ <script src='raytrace_parallel.js'></script>+ <script src='index.js'></script>+ </body>+</html>new file mode 100644@@ -0,0 +1,19 @@+function loadWasm() {+ if (typeof SharedArrayBuffer !== 'function') {+ console.error('this browser does not have SharedArrayBuffer support enabled' + '\n\n' + msg);+ return+ }+ // Test for bulk memory operations with passive data segments+ // (module (memory 1) (data passive ""))+ const buf = new Uint8Array([0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,+ 0x05, 0x03, 0x01, 0x00, 0x01, 0x0b, 0x03, 0x01, 0x01, 0x00]);+ if (!WebAssembly.validate(buf)) {+ console.error('This browser does not support passive Wasm memory, Background threads will not work' + '\n\n' + msg);+ return+ }++ wasm_bindgen()+ .catch(console.error);+}++loadWasm();new file mode 100644@@ -0,0 +1,25 @@+// synchronously, using the browser, import out shim JS scripts+importScripts('raytrace_parallel.js');++// Wait for the main thread to send us the shared module/memory. Once we've got+// it, initialize it all with the `wasm_bindgen` global we imported via+// `importScripts`.+//+// After our first message all subsequent messages are an entry point to run,+// so we just do that.+self.onmessage = event => {+ let initialised = wasm_bindgen(...event.data).catch(err => {+ // Propagate to main `onerror`:+ setTimeout(() => {+ throw err;+ });+ // Rethrow to keep promise rejected and prevent execution of further commands:+ throw err;+ });++ self.onmessage = async event => {+ // This will queue further commands up until the module is fully initialised:+ await initialised;+ wasm_bindgen.child_entry_point(event.data);+ };+};