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fix: Add TaskIntervals struct #91

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Merged
arielb1 merged 1 commit into from
Aug 3, 2025
Merged

fix: Add TaskIntervals struct #91

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169 changes: 92 additions & 77 deletions src/task.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1798,83 +1798,11 @@ impl TaskMonitor {
/// tokio::task::yield_now()
/// }
/// ```
pub fn intervals(&self) -> impl Iterator<Item = TaskMetrics> {
let latest = self.metrics.clone();
let mut previous: Option<TaskMetrics> = None;

std::iter::from_fn(move || {
let latest: TaskMetrics = latest.metrics();
let next = if let Some(previous) = previous {
TaskMetrics {
instrumented_count: latest
.instrumented_count
.wrapping_sub(previous.instrumented_count),
dropped_count: latest.dropped_count.wrapping_sub(previous.dropped_count),
total_poll_count: latest
.total_poll_count
.wrapping_sub(previous.total_poll_count),
total_poll_duration: sub(
latest.total_poll_duration,
previous.total_poll_duration,
),
first_poll_count: latest
.first_poll_count
.wrapping_sub(previous.first_poll_count),
total_idled_count: latest
.total_idled_count
.wrapping_sub(previous.total_idled_count),
total_scheduled_count: latest
.total_scheduled_count
.wrapping_sub(previous.total_scheduled_count),
total_fast_poll_count: latest
.total_fast_poll_count
.wrapping_sub(previous.total_fast_poll_count),
total_short_delay_count: latest
.total_short_delay_count
.wrapping_sub(previous.total_short_delay_count),
total_slow_poll_count: latest
.total_slow_poll_count
.wrapping_sub(previous.total_slow_poll_count),
total_long_delay_count: latest
.total_long_delay_count
.wrapping_sub(previous.total_long_delay_count),
total_first_poll_delay: sub(
latest.total_first_poll_delay,
previous.total_first_poll_delay,
),
total_idle_duration: sub(
latest.total_idle_duration,
previous.total_idle_duration,
),
total_scheduled_duration: sub(
latest.total_scheduled_duration,
previous.total_scheduled_duration,
),
total_fast_poll_duration: sub(
latest.total_fast_poll_duration,
previous.total_fast_poll_duration,
),
total_short_delay_duration: sub(
latest.total_short_delay_duration,
previous.total_short_delay_duration,
),
total_slow_poll_duration: sub(
latest.total_slow_poll_duration,
previous.total_slow_poll_duration,
),
total_long_delay_duration: sub(
latest.total_long_delay_duration,
previous.total_long_delay_duration,
),
}
} else {
latest
};

previous = Some(latest);

Some(next)
})
pub fn intervals(&self) -> TaskIntervals {
TaskIntervals {
metrics: self.metrics.clone(),
previous: None,
}
}
}

Expand Down Expand Up @@ -2582,6 +2510,93 @@ impl ArcWake for State {
}
}

/// Iterator returned by [`TaskMonitor::intervals`].
///
/// See that method's documentation for more details.
#[derive(Debug)]
pub struct TaskIntervals {
metrics: Arc<RawMetrics>,
previous: Option<TaskMetrics>,
}

impl TaskIntervals {
fn probe(&mut self) -> TaskMetrics {
let latest = self.metrics.metrics();
let next = if let Some(previous) = self.previous {
TaskMetrics {
instrumented_count: latest
.instrumented_count
.wrapping_sub(previous.instrumented_count),
dropped_count: latest.dropped_count.wrapping_sub(previous.dropped_count),
total_poll_count: latest
.total_poll_count
.wrapping_sub(previous.total_poll_count),
total_poll_duration: sub(latest.total_poll_duration, previous.total_poll_duration),
first_poll_count: latest
.first_poll_count
.wrapping_sub(previous.first_poll_count),
total_idled_count: latest
.total_idled_count
.wrapping_sub(previous.total_idled_count),
total_scheduled_count: latest
.total_scheduled_count
.wrapping_sub(previous.total_scheduled_count),
total_fast_poll_count: latest
.total_fast_poll_count
.wrapping_sub(previous.total_fast_poll_count),
total_short_delay_count: latest
.total_short_delay_count
.wrapping_sub(previous.total_short_delay_count),
total_slow_poll_count: latest
.total_slow_poll_count
.wrapping_sub(previous.total_slow_poll_count),
total_long_delay_count: latest
.total_long_delay_count
.wrapping_sub(previous.total_long_delay_count),
total_first_poll_delay: sub(
latest.total_first_poll_delay,
previous.total_first_poll_delay,
),
total_idle_duration: sub(latest.total_idle_duration, previous.total_idle_duration),
total_scheduled_duration: sub(
latest.total_scheduled_duration,
previous.total_scheduled_duration,
),
total_fast_poll_duration: sub(
latest.total_fast_poll_duration,
previous.total_fast_poll_duration,
),
total_short_delay_duration: sub(
latest.total_short_delay_duration,
previous.total_short_delay_duration,
),
total_slow_poll_duration: sub(
latest.total_slow_poll_duration,
previous.total_slow_poll_duration,
),
total_long_delay_duration: sub(
latest.total_long_delay_duration,
previous.total_long_delay_duration,
),
}
} else {
latest
};

self.previous = Some(latest);

next
}
}

impl Iterator for TaskIntervals {
type Item = TaskMetrics;

fn next(&mut self) -> Option<Self::Item> {
Some(self.probe())
}
}

#[inline(always)]
fn to_nanos(d: Duration) -> u64 {
debug_assert!(d <= Duration::from_nanos(u64::MAX));
Expand Down
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