Struct Span 

pub struct Span { /* private fields */ }

An open span. Closes when dropped.

Neither Send nor Sync, and that is enforced rather than asked for: the end is pushed onto the buffer of whichever thread drops the guard, so a guard that crossed a thread boundary would pair its end with another thread’s begin and corrupt both tracks’ nesting.

An end always closes the innermost span still open on the track, which for guards held in locals — the shape this is for — is the guard being dropped. Guards kept in a collection and dropped out of order still produce a well-formed trace, but the durations are attributed by nesting rather than by which guard went first.

The Send bound is what refuses the first of those, and it refuses it at compile time:

let span = crcbl_core::trace::span("frame");
std::thread::spawn(move || drop(span));

Trait Implementations

impl Debug for Span

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for Span

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.