The below table lists out the different workqueue APIs that are commonly used in the intialization and usage of a workqueue. For a comprehensive list – refer “workqueue.h” in the linux kernel.

Workqueue API	Description
schedule_work	Schedule the work to be performed
schedule_delayed_work	Put work task in global workqueue after delay
create_workqueue	Creating a new work queue
alloc_workqueue	The newer API used to create a work queue. create_workqueue maps to this internally
queue_work	Queue work to workqueue
queue_delayed_work	Queue work to qorkqueue after dealy
flush_workqueue	Flush all the workqueue work
flush_scheduled_work	Ensure that any scheduled work has run to completion.
destroy_workqueue	To destroy the workqueue

The Following MACROs are also used:

Workqueue Macro	Description
DECLARE_WORK	Declare and Initialize Work
INIT_WORK	If we wish to initialize work separately from the declaraion
DECLARE_DELAYED_WORK	Declare and initialize delayed work

In the following articles we will see example implementations for a workqueue.

Workqueue code example using DECLARE_WORK Macro