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race condition in thread local storage example #58893

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Mar 9, 2019
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race condition in thread local storage example #58893

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5 changes: 4 additions & 1 deletion src/libstd/thread/local.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,13 +40,16 @@ use crate::mem;
/// });
///
/// // each thread starts out with the initial value of 1
/// thread::spawn(move|| {
/// let t = thread::spawn(move|| {
/// FOO.with(|f| {
/// assert_eq!(*f.borrow(), 1);
/// *f.borrow_mut() = 3;
/// });
/// });
///
/// // wait for the thread to complete and bail out on panic
/// t.join().unwrap();
///
/// // we retain our original value of 2 despite the child thread
/// FOO.with(|f| {
/// assert_eq!(*f.borrow(), 2);
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