The
workqueue utility routines are provided to defer work which is needed to be processed in a thread context.
workqueue_create() creates a workqueue. It takes the following arguments:
wqp
Specify where to store the created workqueue.
name
The name of the workqueue.
func
The function to be called for each work.
arg
An argument to be passed as a second argument of func.
prio
The process priority to be used when sleeping to wait requests.
ipl
The highest IPL at which this workqueue is used.
flags
The value of 0 indicates a standard create operation, however the following flags may be bitwise ORed together:
WQ_MPSAFE
Specifies that the workqueue is multiprocessor safe and does its own locking, otherwise the kernel lock will be held while work will be processed.
WQ_PERCPU
Specifies that the workqueue should have a separate queue for each CPU, thus the work could be enqueued on concrete CPUs.
workqueue_enqueue() enqueues the work
wk into the workqueue
wq.
If the
WQ_PERCPU flag was set on workqueue creation, the
ci argument may be used to specify the CPU on which the work should be enqueued. Also it may be
NULL, then work will be enqueued on the current CPU. If
WQ_PERCPU flag was not set,
ci must be
NULL.
The enqueued work will be processed in a thread context. A work must not be enqueued again until the callback is called by the
workqueue framework.
workqueue_destroy() destroys a workqueue and frees associated resources. The caller should ensure that the workqueue has no work enqueued beforehand.