... 2nd Edition June 2001 . ... Task Queues . ... Drivers can use the current value of jiffies to calculate time intervals across events (for example, to tell double clicks from single clicks in input device drivers). ... Device drivers often need to delay the execution of a particular piece of code for a period of time -- usually to allow the hardware to accomplish some task. ... This function consumes a task queue. task_queue tq_immediate, tq_timer; . ... Back to: Linux Device Drivers, 2nd Edition . ...