Function duration

pub fn duration<'a>(
    category: &'static CStr,
    name: &'static CStr,
    args: &'a [Arg<'_>],
) -> DurationScope<'a>

Writes a duration event which ends when the current scope exits, or the end method is manually called.

Durations describe work which is happening synchronously on one thread. They can be nested to represent a control flow stack.

0 to 15 arguments can be associated with the event, each of which is used to annotate the duration with additional information.

NOTE: For performance reasons, it is advisable to create a cached context scope, which will avoid expensive lookups when tracing is disabled. See the example in the duration! macro.