pub fn try_pop_until(&mut self, try_until: Instant) -> Option<T> {
        let mut queue = self.shared_data.queue.lock().unwrap();

        // Loop until an element can be popped or the timeout expires, waiting if necessary
        loop {
            let now = Instant::now();

            let next_elem_duration = match queue.peek() {
                // If there is an element and its delay is expired, break out of the loop to pop it
                Some(elem) if elem.delayed.delayed_until() <= now => break,

                // Calculate the Duration until the element expires
                Some(elem) => elem.delayed.delayed_until() - now,

                // Signal that there is no element with a duration of zero
                None => Duration::from_secs(0),
            };

            if now >= try_until {
                return None;
            }

            let time_left = try_until - now;

            let wait_duration = if next_elem_duration > Duration::from_secs(0) {
                // We'll wait until the time to pop the next element is reached
                // or our timeout expires, whichever comes first
                next_elem_duration.min(time_left)
            } else {
                // There is no element in the queue, we'll wait for one until our timeout expires
                time_left
            };

            // Wait until there is a new head of the queue,
            // the time to pop the current head expires,
            // or the timeout expires
            queue = self.shared_data
                .condvar_new_head
                .wait_timeout(queue, wait_duration)
                .unwrap()
                .0
        }

        Some(self.force_pop(queue))
    }
/// Pops the next item from the queue, blocking if necessary until an item is available and its
/// delay has expired or until the given `Instant` is reached.
///
/// Returns `None` if the given `Instant` is reached and no item became available to be popped.
///
/// # Examples
///
/// Basic usage:
///
/// ```no_run
/// use delay_queue::{Delay, DelayQueue};
/// use std::time::{Duration, Instant};
///
/// let mut queue = DelayQueue::new();
///
/// queue.push(Delay::for_duration("1st", Duration::from_secs(5)));
///
/// // The pop will block for approximately 2 seconds before returning None.
/// println!("First pop: {:?}",
///          queue.try_pop_until(Instant::now() + Duration::from_secs(2))); // Prints "None"
///
/// // The pop will block for approximately 3 seconds before returning the item.
/// println!("Second pop: {}",
///          queue.try_pop_until(Instant::now() + Duration::from_secs(5))
///               .unwrap().value); // Prints "1st"
/// ```
Pops the next item from the queue, blocking if necessary until an item is available and its
delay has expired or until the given `Instant` is reached.

Returns `None` if the given `Instant` is reached and no item became available to be popped.
Pops the next item from the queue blocking if necessary until an item is available and its delay has expired or until the given ` Instant ` is reached . Returns ` None ` if the given ` Instant ` is reached and no item became available to be popped .
pub fn try_pop_until(&mut self, try_until: Instant) -> Option<T> {
        let mut queue = self.shared_data.queue.lock().unwrap();
        // Loop until an element can be popped or the timeout expires, waiting if necessary
        loop {
            let now = Instant::now();
            let next_elem_duration = match queue.peek() {
                // If there is an element and its delay is expired, break out of the loop to pop it
                Some(elem) if elem.delayed.delayed_until() <= now => break,
                // Calculate the Duration until the element expires
                Some(elem) => elem.delayed.delayed_until() - now,
                // Signal that there is no element with a duration of zero
                None => Duration::from_secs(0),
            };
            if now >= try_until {
                return None;
            }
            let time_left = try_until - now;
            let wait_duration = if next_elem_duration > Duration::from_secs(0) {
                // We'll wait until the time to pop the next element is reached
                // or our timeout expires, whichever comes first
                next_elem_duration.min(time_left)
            } else {
                // There is no element in the queue, we'll wait for one until our timeout expires
                time_left
            };
            // Wait until there is a new head of the queue,
            // the time to pop the current head expires,
            // or the timeout expires
            queue = self.shared_data
                .condvar_new_head
                .wait_timeout(queue, wait_duration)
                .unwrap()
                .0
        }
        Some(self.force_pop(queue))
    }
pub fn try_pop_until ( & mut self , try_until : Instant ) -> Option < T > { let mut queue = self . shared_data . queue . lock ( ) . unwrap ( ) ; // Loop until an element can be popped or the timeout expires, waiting if necessary loop { let now = Instant :: now ( ) ; let next_elem_duration = match queue . peek ( ) { // If there is an element and its delay is expired, break out of the loop to pop it Some ( elem ) if elem . delayed . delayed_until ( ) <= now => break , // Calculate the Duration until the element expires Some ( elem ) => elem . delayed . delayed_until ( ) - now , // Signal that there is no element with a duration of zero None => Duration :: from_secs ( 0 ) , } ; if now >= try_until { return None ; } let time_left = try_until - now ; let wait_duration = if next_elem_duration > Duration :: from_secs ( 0 ) { // We'll wait until the time to pop the next element is reached // or our timeout expires, whichever comes first next_elem_duration . min ( time_left ) } else { // There is no element in the queue, we'll wait for one until our timeout expires time_left } ; // Wait until there is a new head of the queue, // the time to pop the current head expires, // or the timeout expires queue = self . shared_data . condvar_new_head . wait_timeout ( queue , wait_duration ) . unwrap ( ) . 0 } Some ( self . force_pop ( queue ) ) }
Pops the next item from the queue, blocking if necessary until an item is available and its
delay has expired or until the given `Instant` is reached.
Pops the next item from the queue blocking if necessary until an item is available and its delay has expired or until the given ` Instant ` is reached .
&mut self
try_until
Instant
examples
Basic usage.

```no_run
use delay_queue::{Delay, DelayQueue};
use std::time::{Duration, Instant}.

let mut queue = DelayQueue::new().

queue.push(Delay::for_duration("1st", Duration::from_secs(5))).

The pop will block for approximately 2 seconds before returning None.
println!("First pop: {:?}",
queue.try_pop_until(Instant::now() + Duration::from_secs(2))); // Prints "None"

The pop will block for approximately 3 seconds before returning the item.
println!("Second pop: {}",
queue.try_pop_until(Instant::now() + Duration::from_secs(5))
.unwrap().value); // Prints "1st"
```
Basic usage . ` ` ` no_run use delay_queue :: { Delay DelayQueue } ; use std :: time :: { Duration Instant } . let mut queue = DelayQueue :: new () . queue . push ( Delay :: for_duration ( " 1st " Duration :: from_secs ( 5 ))) . The pop will block for approximately 2 seconds before returning None . println! ( " First pop : { : ? } " queue . try_pop_until ( Instant :: now () + Duration :: from_secs ( 2 ))) ; // Prints " None " The pop will block for approximately 3 seconds before returning the item . println! ( " Second pop : {} " queue . try_pop_until ( Instant :: now () + Duration :: from_secs ( 5 )) . unwrap () . value ) ; // Prints " 1st " ` ` `