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hare-playground/cmd/threads/main.ha

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use types::c;
use fmt;
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use thread;
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fn thread_start(data: nullable *opaque) void = {
let arg = data: *u32;
fmt::printfln("hello from another thread. you sent: {}", *arg)!;
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};
export fn main() void = {
fmt::println("starting a thread")!;
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let tid = thread::spawn(&thread_start, &42)!;
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fmt::println("joining")!;
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thread::join(tid)!;
fmt::println("joined. good bye.")!;
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};