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Support for wasm-bindgen based querying of hardwareConcurrency. #141

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Support for wasm-bindgen based querying of hardwareConcurrency. #141

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9 changes: 9 additions & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,3 +16,12 @@ libc = "0.2.26"

[target.'cfg(target_os = "hermit")'.dependencies]
hermit-abi = "0.3.0"

[target.'cfg(target_arch = "wasm32")'.dependencies]
web-sys = { version = "0.3.0", features = [
"WorkerNavigator",
"DedicatedWorkerGlobalScope",
], optional = true }

[features]
wasm-bindgen-support = ["web-sys"]
17 changes: 17 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -433,6 +433,22 @@ fn get_num_cpus() -> usize {
unsafe { hermit_abi::get_processor_count() }
}

#[cfg(feature = "wasm-bindgen-support")]
extern crate web_sys;

#[cfg(feature = "wasm-bindgen-support")]
fn get_num_cpus() -> usize {
use web_sys::{wasm_bindgen::JsCast, DedicatedWorkerGlobalScope};

let global = web_sys::js_sys::global();

// DedicatedWorkerGlobalScope is not always the correct type
// but the underlying global will always have access to `navigator`
// either way and this was the simplest way to work with `web_sys`.
let global = global.unchecked_into::<DedicatedWorkerGlobalScope>();
global.navigator().hardware_concurrency() as usize
}

#[cfg(not(any(
target_os = "nacl",
target_os = "macos",
Expand All @@ -449,6 +465,7 @@ fn get_num_cpus() -> usize {
target_os = "netbsd",
target_os = "haiku",
target_os = "hermit",
feature = "wasm-bindgen-support",
windows,
)))]
fn get_num_cpus() -> usize {
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