2 releases
0.1.1 | Jul 24, 2021 |
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0.1.0 | Jul 24, 2021 |
#1121 in Concurrency
19KB
421 lines
Task queue
Description
Parallel execution of the task queue with the ability to add new tasks inside the running tasks
Examples
let thread_count = 2;
let queue_type = QueueType::Stack;
let task_queue = TaskQueue::new(thread_count, queue_type);
where
thread_count
- the number of threads that execute tasks in parallel
queue_type
-
determines at the beginning or at the end of the queue the task will be added (Available values: Queue, Stack)
struct RecursiveTimeoutTask {
timeout_sec: u64,
deep: u8,
}
impl RecursiveTimeoutTask {
fn new(timeout_sec: u64, deep: u8) -> Self {
Self { timeout_sec, deep }
}
}
impl RunTask for RecursiveTimeoutTask {
fn run(self: Box<Self>, _id: WorkerId, task_receiver: TaskReceiver) -> TaskControlCommand {
std::thread::sleep(std::time::Duration::from_secs(self.timeout_sec));
if self.deep > 0 {
task_receiver.add_task(Box::new(RecursiveTimeoutTask::new(
self.timeout_sec,
self.deep - 1,
)));
}
TaskControlCommand::Continue
}
}
In order to add a task to the queue, you need to implement the trait RunTask
. The third argument task_receiver
is used to add new tasks. Method run
returns TaskControlCommand
, availabale values Continue
- default value that does not affect the operation of the queue in any way, Abort
- reset outstanding tasks and do not take new ones, the task queue will no longer execute tasks added externally.
// Add new task
task_queue.add_task(Box::new(RecursiveTimeoutTask::new(2, 4)))?;
task_queue.add_task(Box::new(RecursiveTimeoutTask::new(5, 2)))?;
// Cancel tasks and wait for the completion of task processing (Analogue - TaskControlCommand::Abort)
task_queue.abort()?;
// Wait untill all tasks are completed
task_queue.join()?;
! If you do not use abort
/ join
, drop will be used, but panics from worker processes are not handled, use join instead.
Dependencies
~1.5MB
~36K SLoC