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/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
* 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 unmodified, 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 ``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 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 _LINUX_KTHREAD_H_
#define _LINUX_KTHREAD_H_
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/sleepqueue.h>
#include <machine/rtems-bsd-thread.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/threads.h>
#define KTHREAD_LOCK(task) mtx_lock(&(task)->lock)
#define KTHREAD_UNLOCK(task) mtx_unlock(&(task)->lock)
static inline void
_kthread_fn(void *arg)
{
struct task_struct *task;
struct thread *c;
task = arg;
task_struct_set(curthread, task);
c = task->task_thread;
sleepq_lock(c);
while (task->state == TASK_DORMANT)
sleepq_wait(c, 0);
sleepq_release(c);
if (task->should_stop == 0)
task->task_ret = task->task_fn(task->task_data);
KTHREAD_LOCK(task);
task->should_stop = TASK_STOPPED;
wakeup(task);
KTHREAD_UNLOCK(task);
kthread_exit();
}
static inline struct task_struct *
_kthread_create(int (*threadfn)(void *data), void *data)
{
struct task_struct *task;
task = kzalloc(sizeof(*task), GFP_KERNEL);
task->task_fn = threadfn;
task->task_data = data;
mtx_init(&task->lock, "kthread", NULL, MTX_DEF);
return (task);
}
#define kthread_create(fn, data, fmt, ...) \
({ \
struct task_struct *_task; \
\
_task = _kthread_create((fn), (data)); \
if (kthread_add(_kthread_fn, _task, NULL, &_task->task_thread, \
0, 0, fmt, ## __VA_ARGS__)) { \
kfree(_task); \
_task = NULL; \
} else \
task_struct_set(_task->task_thread, _task); \
_task; \
})
#define kthread_should_stop() current->should_stop
static inline int
kthread_stop(struct task_struct *task)
{
KTHREAD_LOCK(task);
task->should_stop = TASK_SHOULD_STOP;
wake_up_process(task);
while (task->should_stop != TASK_STOPPED)
msleep(task, &task->lock, PWAIT, "kstop", hz);
KTHREAD_UNLOCK(task);
return task->task_ret;
}
static inline void
kthread_bind(struct task_struct *task, unsigned int cpu)
{
/* FIXME */
rtems_id task_id = rtems_bsd_get_task_id(task->task_thread);
rtems_id sched_id;
rtems_status_code sc;
rtems_task_priority prio;
sc = rtems_scheduler_ident(cpu, &sched_id);
if (sc != RTEMS_SUCCESSFUL)
panic("kthread_bind: scheduler ident");
sc = rtems_task_set_priority(task_id, RTEMS_CURRENT_PRIORITY, &prio);
if (sc != RTEMS_SUCCESSFUL)
panic("kthread_bind: get priority");
sc = rtems_task_set_scheduler(task_id, sched_id, prio);
if (sc != RTEMS_SUCCESSFUL)
panic("kthread_bind: set scheduler");
}
#endif /* _LINUX_KTHREAD_H_ */
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