Date: Thu, 18 May 2000 21:24:13 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: arch@freebsd.org Subject: A new api for asynchronous task execution (3) Message-ID: <Pine.BSF.4.21.0005182120520.73457-400000@salmon.nlsystems.com>
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Ok, I think this version is starting to look worth committing. This one
adds priority sorted queueing, uses structure field prefixes and provides
convenience macros for declaring queues.
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) ta_link; /* link for queue */
int ta_pending; /* count times queued */
int ta_priority; /* priority of task in queue */
task_fn ta_func; /* task handler */
void *ta_context; /* argument for handler */
};
struct taskqueue *
taskqueue_create(const char *name, int mflags,
taskqueue_enqueue_fn enqueue, void *context)
void
taskqueue_free(struct taskqueue *queue)
struct taskqueue *
taskqueue_find(const char *name)
void
taskqueue_enqueue(struct taskqueue *queue, struct task *task)
void
taskqueue_run(struct taskqueue *queue)
TASK_INIT(task, priority, func, context)
TASKQUEUE_DECLARE(name)
TASKQUEUE_DEFINE(name, enqueue, context, init)
DESCRIPTION
These functions provide a simple interface for asynchronous execution of
code.
The function taskqueue_create() is used to create new queues. The argu-
ments to taskqueue_create() include a name which should be unique, a set
of malloc(9) flags which specify whether the call to malloc() is allowed
to sleep 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 and free the memory used by the queue. 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
ta_pending field is non-zero, then it is simply incremented to reflect
the number of times the task was enqueued. Otherwise, the task is added
to the list before the first task which has a lower ta_priority value or
at the end of the list if no tasks have a lower priority. 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 ta_pending
is recorded and the field is zeroed. The function ta_func from the task
structure is called with the value of the field ta_context its first ar-
gument and the value of ta_pending as its second argument.
A convenience macro, TASK_INIT(task, priority, func, context) is provided
to initialise a task structure. The values of priority, func, and
context are simply copied into the task structure fields and the
ta_pending field is cleared.
Two macros TASKQUEUE_DECLARE(name) and TASKQUEUE_DEFINE(name, enqueue,
context, init) are used to declare a reference to a global queue and to
define the implementation of the queue. The TASKQUEUE_DEFINE() macro ar-
ranges to call taskqueue_create() with the values of its name, enqueue
and context arguments during system initialisation. After calling
taskqueue_create(), the init argument to the macro is executed as a C
statement, allowing any further initialisation to be performed (such as
registering an interrupt handler etc.)
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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