workqueue_enqueue(9) [netbsd man page]

WORKQUEUE(9)						   BSD Kernel Developer's Manual					      WORKQUEUE(9)

NAME

     workqueue -- simple do-it-in-thread-context framework

SYNOPSIS

     #include <sys/workqueue.h>

     int
     workqueue_create(struct workqueue **wqp, const char *name, void (*func)(struct work *, void *), void *arg, pri_t prio, int ipl, int flags);

     void
     workqueue_enqueue(struct workqueue *wq, struct work *wk, struct cpu_info *ci);

     void
     workqueue_destroy(struct workqueue *wq);

DESCRIPTION

     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 priority level for the worker threads.

     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.

RETURN VALUES

     workqueue_create() returns 0 on success.  Otherwise, it returns an errno(2).

CODE REFERENCES

     The workqueue subsystem is implemented within the file sys/kern/subr_workqueue.c.

SEE ALSO

     callout(9), condvar(9), kthread(9), softint(9)

BSD
								 October 24, 2011							       BSD

TAPSET::IRQ(3stap)														TAPSET::IRQ(3stap)

NAME

       tapset::irq - Systemtap probes for IRQ, workqueue,etc

DESCRIPTION

       Probe points for probing irq handler execution, softirqs, workqueues,etc

       workqueue.create
	      probes creation of a new workqueue

	      Arguments:

	      wq_thread
		 task_struct of the workqueue thread.

	      cpu
		 cpu for which the worker thread is created.

       workqueue.insert
	      probes queuing of work on a workqueue.

	      Arguments:

	      wq_thread
		 task_struct of the workqueue thread.

	      work
		 work_struct* being executed.

	      work_func
		 pointer to handler func.

       workqueue.execute
	      probes execution of deferred work.

	      Arguments:

	      wq_thread
		 task_struct of the workqueue thread.

	      work
		 work_struct* being executed.

	      work_func
		 pointer to handler func.

       workqueue.destroy
	      probes destruction of each worker thread of each cpu for a workqueue.

	      Arguments:

	      wq_thread
		task_struct of the workqueue thread.

       irq_handler.entry
	      Fires prior to execution of interrupt handler.

	      Arguments:

	      irq
		 irq number

	      action
		 struct irqaction* for this interrupt number

	      handler
		 interrupt handler function

	      flags
		 flags for this irq.

	      flags_str
		 A formatted string of flags.

	      dev_name
		 name of device

	      dev_id
		 cookie to identify device

	      next_irqaction
		 pointer to next irqaction for shared interrupts

	      dir
		 pointer to the /proc/irq/NN/name entry

	      thread_fn
		 interrupt handler function for threaded interrupts

	      thread
		 thread pointer for threaded interrupts

	      thread_flags
		 flags related to thread

       irq_handler.exit
	      Fires post execution of interrupt handler.

	      Arguments:

	      irq
		 irq number

	      action
		 struct irqaction* for this interrupt number

	      ret
		 return value from interrupt handler that just executed.

	      handler
		 interrupt handler function

	      flags
		 flags for this irq.

	      flags_str
		 A formatted string of flags.

	      dev_name
		 name of device

	      dev_id
		 cookie to identify device

	      next_irqaction
		 pointer to next irqaction for shared interrupts

	      dir
		 pointer to the /proc/irq/NN/name entry

	      thread_fn
		 interrupt handler function for threaded interrupts

	      thread
		 thread pointer for threaded interrupts

	      thread_flags
		 flags related to thread

       softirq.entry
	      triggered just before executing handler for a pending softirq

	      Arguments:

	      h
		 struct softirq* for current pending softirq.

	      vec
		 softirq_action vector

	      action
		 pointer to softirq handler just about to execute.

       softirq.exit
	      triggered just after executing handler for a pending softirq

	      Arguments:

	      h
		 struct softirq* for just executed softirq.

	      vec
		 softirq_action vector

	      action
		 pointer to softirq handler that just finished execution.

SEE ALSO

       stap(1), stapprobes(3stap)

IBM
																TAPSET::IRQ(3stap)