/*
 * Copyright (c) 1999 Peter Wemm <peter@FreeBSD.org>
 * 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.
 */

#ifndef _SYS_KTHREAD_H_
#define _SYS_KTHREAD_H_

#ifndef _SYS_CDEFS_H_
#include <sys/cdefs.h>
#endif

#if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
#error "This file should not be included by userland programs."
#endif

struct proc;
struct thread;

/* 
 * A kernel process descriptor; used to start "internal" daemons
 * 
 * Note: global_procpp may be NULL for no global save area
 */
struct kproc_desc {
        char            *arg0;                  /* arg 0 (for 'ps' listing) */
        void            (*func) (void);         /* "main" for kernel process */
        struct thread   **global_threadpp;      /* ptr to proc ptr save area */
};

#ifdef _KERNEL
void    kproc_start (const void *);

int     suspend_kproc (struct thread *, int);
int     resume_kproc (struct thread *);
void    kproc_suspend_loop (void);
void    shutdown_kproc (void *, int);
int     kthread_alloc (void (*)(void *), void *, struct thread **,
            const char *, ...) __printflike(4, 5);
int     kthread_create (void (*)(void *), void *, struct thread **,
            const char *, ...) __printflike(4, 5);
int     kthread_create_cpu (void (*)(void *), void *, struct thread **,
            int, const char *, ...) __printflike(5, 6);
void    kthread_exit (void) __dead2;
#endif /* _KERNEL */

#endif /* _SYS_KTHREAD_H_ */