mirror of https://github.com/rust-lang/rust
38 lines
865 B
Rust
38 lines
865 B
Rust
//@ run-pass
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//@ needs-threads
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// This time we're testing repeatedly going up and down both stacks to
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// make sure the stack pointers are maintained properly in both
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// directions
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use std::thread;
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#[link(name = "rust_test_helpers", kind = "static")]
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extern "C" {
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pub fn rust_dbg_call(
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cb: extern "C" fn(u64) -> u64,
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data: u64,
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) -> u64;
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}
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extern "C" fn cb(data: u64) -> u64 {
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if data == 1 { data } else { count(data - 1) + count(data - 1) }
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}
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fn count(n: u64) -> u64 {
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unsafe {
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println!("n = {}", n);
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rust_dbg_call(cb, n)
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}
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}
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pub fn main() {
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// Make sure we're on a thread with small Rust stacks (main currently
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// has a large stack)
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thread::spawn(move || {
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let result = count(12);
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println!("result = {}", result);
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assert_eq!(result, 2048);
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})
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.join().unwrap();
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}
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