/*-
* Copyright (c) 2000 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_TASKQUEUE_HH_
#define _SYS_TASKQUEUE_HH_
#ifndef _KERNEL
#error "no user-servicable parts inside"
#endif
#include <freebsd/sys/queue.h>
#include <freebsd/sys/_task.h>
struct taskqueue;
struct thread;
/*
* A notification callback function which is called from
* taskqueue_enqueue(). The context argument is given in the call to
* taskqueue_create(). This function would normally be used to allow the
* queue to arrange to run itself later (e.g., by scheduling a software
* interrupt or waking a kernel thread).
*/
typedef void (*taskqueue_enqueue_fn)(void *context);
struct taskqueue *taskqueue_create(const char *name, int mflags,
taskqueue_enqueue_fn enqueue,
void *context);
int taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
const char *name, ...) __printflike(4, 5);
int taskqueue_enqueue(struct taskqueue *queue, struct task *task);
void taskqueue_drain(struct taskqueue *queue, struct task *task);
void taskqueue_free(struct taskqueue *queue);
void taskqueue_run(struct taskqueue *queue);
void taskqueue_block(struct taskqueue *queue);
void taskqueue_unblock(struct taskqueue *queue);
int taskqueue_member(struct taskqueue *queue, struct thread *td);
/*
* Functions for dedicated thread taskqueues
*/
void taskqueue_thread_loop(void *arg);
void taskqueue_thread_enqueue(void *context);
/*
* Initialise a task structure.
*/
#define TASK_INIT(task, priority, func, context) do { \
(task)->ta_pending = 0; \
(task)->ta_priority = (priority); \
(task)->ta_func = (func); \
(task)->ta_context = (context); \
} while (0)
/*
* Declare a reference to a taskqueue.
*/
#define TASKQUEUE_DECLARE(name) \
extern struct taskqueue *taskqueue_##name
/*
* Define and initialise a global taskqueue that uses sleep mutexes.
*/
#define TASKQUEUE_DEFINE(name, enqueue, context, init) \
\
struct taskqueue *taskqueue_##name; \
\
static void \
taskqueue_define_##name(void *arg) \
{ \
taskqueue_##name = \
taskqueue_create(#name, M_NOWAIT, (enqueue), (context)); \
init; \
} \
\
SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND, \
taskqueue_define_##name, NULL); \
\
struct __hack
#define TASKQUEUE_DEFINE_THREAD(name) \
TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name, \
taskqueue_start_threads(&taskqueue_##name, 1, PWAIT, \
"%s taskq", #name))
/*
* Define and initialise a global taskqueue that uses spin mutexes.
*/
#define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init) \
\
struct taskqueue *taskqueue_##name; \
\
static void \
taskqueue_define_##name(void *arg) \
{ \
taskqueue_##name = \
taskqueue_create_fast(#name, M_NOWAIT, (enqueue), \
(context)); \
init; \
} \
\
SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND, \
taskqueue_define_##name, NULL); \
\
struct __hack
#define TASKQUEUE_FAST_DEFINE_THREAD(name) \
TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue, \
&taskqueue_##name, taskqueue_start_threads(&taskqueue_##name \
1, PWAIT, "%s taskq", #name))
/*
* These queues are serviced by software interrupt handlers. To enqueue
* a task, call taskqueue_enqueue(taskqueue_swi, &task) or
* taskqueue_enqueue(taskqueue_swi_giant, &task).
*/
TASKQUEUE_DECLARE(swi_giant);
TASKQUEUE_DECLARE(swi);
/*
* This queue is serviced by a kernel thread. To enqueue a task, call
* taskqueue_enqueue(taskqueue_thread, &task).
*/
TASKQUEUE_DECLARE(thread);
/*
* Queue for swi handlers dispatched from fast interrupt handlers.
* These are necessarily different from the above because the queue
* must be locked with spinlocks since sleep mutex's cannot be used
* from a fast interrupt handler context.
*/
TASKQUEUE_DECLARE(fast);
int taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task);
struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
taskqueue_enqueue_fn enqueue,
void *context);
#endif /* !_SYS_TASKQUEUE_HH_ */
