Date: Tue, 16 May 2000 21:48:21 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: arch@freebsd.org Subject: A new api for asynchronous task execution (2) Message-ID: <Pine.BSF.4.21.0005162147060.47945-300000@salmon.nlsystems.com>
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Ok, after the last set of feedback, I have updated the design
somewhat. This is the latest manpage and I have attached a sample
implementation (not thoroughly tested).
TASKQUEUE(9) FreeBSD Kernel Developer's Manual TASKQUEUE(9)
NAME
taskqueue - asynchronous task execution
SYNOPSIS
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
typedef void (*task_fn)(void *context, int pending);
typedef void (*taskqueue_enqueue_fn)(void *context);
struct task {
STAILQ_ENTRY(task) link; /* link for queue */
int pending; /* count times task is queued */
task_fn func; /* task handler */
void *context; /* argument for handler */
};
#define TQ_DEF 0 /* use blocking mutex */
#define TQ_SPIN 1 /* use spin mutex */
void
taskqueue_init(struct taskqueue *queue, const char *name, int flags,
taskqueue_enqueue_fn enqueue, void *context)
struct taskqueue *
taskqueue_find(const char *name)
void
taskqueue_enqueue(struct taskqueue *queue, struct task *task)
void
taskqueue_run(struct taskqueue *queue)
DESCRIPTION
These functions provide a simple interface for asynchronous execution of
code.
Before a queue can be used, it must first be initialised with
taskqueue_init(). The arguments to taskqueue_init() include a name which
should be unique, a flag which specifies the type of SMP mutex used to
protect the queue and a function which is called from taskqueue_enqueue()
when a task is added to the queue to allow the queue to arrange to be run
later (for instance by scheduling a software interrupt or waking a kernel
thread).
The function taskqueue_free() should be used to remove the queue from the
global list of queues. Any tasks which are on the queue will be executed
at this time.
The system maintains a list of all queues which can be searched using
taskqueue_find(). The first queue whose name matches is returned, other-
wise NULL.
To add a task to the list of tasks queued on a taskqueue, call
taskqueue_enqueue() with pointers to the queue and task. If the task's
pending field is zero, the task is added to the end of the list and
pending is set to one, otherwise, pending is incremented. Enqueueing a
task does not perform any memory allocation which makes it suitable for
calling from an interrupt handler.
To execute all the tasks on a queue, call taskqueue_run(). When a task
is executed, first it is removed from the queue, the value of pending is
recorded and the field is zeroed. The function func from the task struc-
ture is called with the value of the field context its first argument and
the value of pending as its second argument.
The system provides a global taskqueue, taskqueue_swi, which is run via a
software interrupt mechanism. To use this queue, call
taskqueue_enqueue() with the value of the global variable taskqueue_swi.
The queue will be run at splsofttq().
This queue can be used, for instance, for implementing interrupt handlers
which must perform a significant amount of processing in the handler.
The hardware interrupt handler would perform minimal processing of the
interrupt and then enqueue a task to finish the work. This reduces the
amount of time spent with interrupts disabled to a minimum.
HISTORY
This interface first appeared in FreeBSD 5.0. There is a similar facili-
ty called tqueue in the Linux kernel.
AUTHORS
This man page was written by Doug Rabson.
FreeBSD May 12, 2000 2
--
Doug Rabson Mail: dfr@nlsystems.com
Nonlinear Systems Ltd. Phone: +44 20 8442 9037
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