The time unit for the delay is jiffies. To wait for all work items to finish call flush_workqueue(): void flush_workqueue(struct worksqueue_struct * queue);

... Initialize the variables and APIs which is used in this program. ... static int __init queue_init(void) { INIT_DELAYED_WORK(&d_work, workqueue_func); queue_delayed_work(system_wq, &d_work, msecs_to_jiffies(TIMEOUT)); pr_info("Driver Loaded\n"); return 0; }

October 28, 2025 - import { Queue } from 'bullmq'; const myQueue = new Queue('Paint'); // Add a job that will be delayed by at least 5 seconds. await myQueue.add('house', { color: 'white' }, { delay: 5000 }); If you want to process the job after a specific point ...

foo_init() allocates the delayed work structure and queues it with a ten-jiffy delay.

Rails 4: replace script/delayed_job with bin/delayed_job · Workers can be running on any computer, as long as they have access to the database and their clock is in sync. Keep in mind that each worker will check the database at least every 5 seconds. You can also invoke rake jobs:work which will start working off jobs. You can cancel the rake task with CTRL-C. If you want to just run all available jobs and exit you can use rake jobs:workoff · Work off queues by setting the QUEUE or QUEUES environment variable.

If the desired behavior is queueing only if certain events took place while work is disabled, the user should implement the necessary state tracking and perform explicit conditional queueing after enable_work(). bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay)¶

The way we do this is we create a task, held in a workqueue_struct structure, which will hold a pointer to the function. Then, we use queue_delayed_work to put that task on a task list called my_workqueue, which is the list of tasks to be executed on the next timer interrupt.

Don't forget to cancel the possible work in the queue (cancel_delayed_work_sync) when you close the workqueue, otherwise your kernel will crash. ... You are a lifesaver, arxchruncher, I had spent an hour trying to figure out why my kernel crashed. ... Here is a minimal working example using cancel_work_sync https://github.com/cirosantilli/linux-kernel-module-cheat/blob/ad077d3943f79c0f6481dab929970613c33c31a7/kernel_module/workqueue_cheat.c

queue_delayed_work — queue work on a workqueue after delay

// //Specific workqueues operation to enqueue work on a work queue // #define create_workqueue(name) \ alloc_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, 1, (name)) static inline bool queue_work (struct workqueue_struct *wq, struct work_struct *work); static inline bool queue_delayed_work (struct workqueue_struct *wq, struct delayed_work *dwork, unsigned long delay); extern bool queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work); extern bool queue_delayed_work_on (int cpu, struct workqueue_struct *wq, struct delayed_work *work, unsigned long delay); extern void flus

bool queue_delayed_work(struct workqueue_struct * wq, struct delayed_work * dwork, unsigned long delay);

An example is collecting data that comes in asynchronously, e.g. characters from a UART associated with a keyboard. There are two APIs that submit work after a delay: k_work_schedule() (or k_work_schedule_for_queue()) schedules work to be executed at a specific time or after a delay.

SYNOPSIS int queue_delayed_work(struct workqueue_struct * wq, struct delayed_work * dwork, unsigned long delay);

October 31, 2021 - For example, suppose a message queue storage like Kafka is used to implement the delay function, each queue time needs to create a separate topic (e.g. Q1–1s, Q1–2s…) .

To set delay seconds on individual ... delay queue's DelaySeconds value. EventBridge Scheduler also supports scheduling individual messages. ... Thanks for letting us know we're doing a good job! If you've got a moment, please tell us what we did right so we can do more of it. ... Thanks for letting us know this page needs work...

February 2, 2026 - Args: queue_url: FIFO queue URL message_body: Message content message_group_id: Group ID for ordering (messages in same group are ordered) deduplication_id: Optional dedup ID (auto-generated if content-based dedup enabled) Returns: SendMessage response """ params = { 'QueueUrl': queue_url, 'MessageBody': json.dumps(message_body), 'MessageGroupId': message_group_id, } # Add deduplication ID if not using content-based deduplication if deduplication_id: params['MessageDeduplicationId'] = deduplication_id response = sqs.send_message(**params) print(f"FIFO message sent to group '{message_group_id}'

September 24, 2023 - A call to cancel_work_sync will terminate the work in the queue or block until the callback has finished (if the work is already in progress in the handler). If the work is delayed, you can use a call to cancel_delayed_work_sync. ... Finally, you can find out whether a work item is pending (not yet executed by the handler) with a call to work_pending or delayed_work_pending. ... I took the source code from the previous interrupt example tutorial.

November 9, 2025 - In the example above, we take three parameters to initialize a Delayed object. First one is data and this is just for demo purpose and will use later. Second one is the delay that we can get object from queue after and third one is TimeUnit.

October 21, 2025 - Rate smoothing — spread out work to avoid thundering herds. Built-in support for delayed messages in brokers. ... Use a Redis sorted set with score = execution timestamp. Fast lookups; easy cancel/reschedule. ... # Schedule a job ZADD delays <execution_timestamp> <job_id> # Fetch due jobs (batch of 100) ZRANGEBYSCORE delays -inf <now> LIMIT 0 100 # Remove once picked up ZREM delays <job_id>