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Add support for wasm-bindgen #103

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Add support for wasm-bindgen #103

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a1b1bf7
Add support for wasm-bindgen
RReverser Jan 19, 2021
6513ff7
Remove obsolete wasm-bindgen attributes
RReverser Jan 19, 2021
8c9816b
Add doc comment to the wasm-bindgen feature
RReverser Jan 19, 2021
ebcaba2
Update src/lib.rs
RReverser Aug 26, 2021
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3 changes: 3 additions & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,3 +16,6 @@ libc = "0.2.26"

[target.'cfg(all(any(target_arch = "x86_64", target_arch = "aarch64"), target_os = "hermit"))'.dependencies]
hermit-abi = "0.1.3"

[target.'cfg(target_arch = "wasm32")'.dependencies]
wasm-bindgen = { version = "0.2", optional = true }
21 changes: 19 additions & 2 deletions src/lib.rs
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Expand Up @@ -2,7 +2,7 @@
//! current system.
//!
//! Sometimes the CPU will exaggerate the number of CPUs it contains, because it can use
//! [processor tricks] to deliver increased performance when there are more threads. This
//! [processor tricks] to deliver increased performance when there are more threads. This
//! crate provides methods to get both the logical and physical numbers of cores.
//!
//! This information can be used as a guide to how many tasks can be run in parallel.
Expand Down Expand Up @@ -37,6 +37,9 @@ extern crate libc;
#[cfg(target_os = "hermit")]
extern crate hermit_abi;

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

#[cfg(target_os = "linux")]
mod linux;
#[cfg(target_os = "linux")]
Expand Down Expand Up @@ -89,7 +92,7 @@ pub fn get() -> usize {
/// let physical_cpus = num_cpus::get_physical();
/// if logical_cpus > physical_cpus {
/// println!("We have simultaneous multithreading with about {:.2} \
/// logical cores to 1 physical core.",
/// logical cores to 1 physical core.",
/// (logical_cpus as f64) / (physical_cpus as f64));
/// } else if logical_cpus == physical_cpus {
/// println!("Either we don't have simultaneous multithreading, or our \
Expand Down Expand Up @@ -405,6 +408,19 @@ fn get_num_cpus() -> usize {
unsafe { hermit_abi::get_processor_count() }
}

#[cfg(feature = "wasm-bindgen")]
fn get_num_cpus() -> usize {
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
extern "C" {
#[wasm_bindgen(js_namespace = navigator, js_name = hardwareConcurrency, method, getter)]
static HARDWARE_CONCURRENCY: usize;
}

std::cmp::min(*HARDWARE_CONCURRENCY, 1)
}

#[cfg(not(any(
target_os = "nacl",
target_os = "macos",
Expand All @@ -420,6 +436,7 @@ fn get_num_cpus() -> usize {
target_os = "netbsd",
target_os = "haiku",
target_os = "hermit",
feature = "wasm-bindgen",
windows,
)))]
fn get_num_cpus() -> usize {
Expand Down