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@ -458,6 +458,16 @@ pub fn yield_now() {
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/// Determines whether the current thread is unwinding because of panic.
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///
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/// A common use of this feature is to poison shared resources when writing
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/// unsafe code, by checking `panicking` when the `drop` is called.
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///
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/// This is usually not needed when writing safe code, as [`Mutex`es][Mutex]
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/// already poison themselves when a thread panics while holding the lock.
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///
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/// This can also be used in multithreaded applications, in order to send a
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/// message to other threads warning that a thread has panicked (e.g. for
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/// monitoring purposes).
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///
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/// # Examples
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///
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/// ```should_panic
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@ -486,6 +496,8 @@ pub fn yield_now() {
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/// panic!()
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/// }
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/// ```
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///
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/// [Mutex]: ../../std/sync/struct.Mutex.html
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn panicking() -> bool {
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