zigar.thread.use() - chung-leong/zigar GitHub Wiki

Enable calling of JavaScript functions from other threads. Node.js event loop will continue to await call requests until end() is called.

use() can be called multiple times, with only the first call having actual effect. An internal counter ensures that call handling is terminated only after end() has been called a matching number of times.

It does nothing when the target platform is WebAssembly.

Usage

const std = @import("std");
const zigar = @import("zigar");

pub fn startup() !void {
    try zigar.thread.use();
}

pub fn spawn(cb: *const fn () void) !void {
    const thread = try std.Thread.spawn(.{}, run, .{cb});
    thread.detach();
}

fn run(cb: *const fn () void) void {
    cb();
}

pub fn shutdown() void {
    zigar.thread.end();
}

import { spawn, startup, shutdown } from './thread-example-1.zig';

startup();
spawn(() => {
    console.log('Hello world');
});
await new Promise(r => setTimeout(r, 200));
shutdown();

Hello world

Return value:

error{UnableToUseThread}!void