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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __THREAD_H__
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#define __THREAD_H__
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#include <arch/thread.h>
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#include <proc/task.h>
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#include <synch/spinlock.h>
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#include <arch/context.h>
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#include <fpu_context.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <time/timeout.h>
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#include <synch/rwlock.h>
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#include <mm/page.h>
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#include <list.h>
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#define THREAD_STACK_SIZE   PAGE_SIZE
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#define THREAD_USER_STACK   1
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enum state {
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    Invalid,
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    Running,
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    Sleeping,
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    Ready,
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    Entering,
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    Exiting
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};
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extern char *thread_states[];
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#define X_WIRED     (1<<0)
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#define X_STOLEN    (1<<1)
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struct thread {
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    link_t rq_link;             /* run queue link */
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    link_t wq_link;             /* wait queue link */
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    link_t th_link;             /* links to threads within the parent task*/
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    link_t threads_link;
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    /* items below are protected by lock */
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    spinlock_t lock;
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    void (* thread_code)(void *);
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    void *thread_arg;
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    context_t saved_context;
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    context_t sleep_timeout_context;
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    fpu_context_t saved_fpu_context;
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    int fpu_context_exists;
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    /*
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     * Defined only if thread doesn't run.
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     * It means that fpu context is in CPU that last time executes this thread.
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     * This disables migration
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     */
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    int fpu_context_engaged;
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    waitq_t *sleep_queue;
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    timeout_t sleep_timeout;
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    volatile int timeout_pending;
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    rwlock_type_t rwlock_holder_type;
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    void (* call_me)(void *);
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    void *call_me_with;
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    int state;
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    int flags;
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    cpu_t *cpu;
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    task_t *task;
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    __u64 ticks;
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    __u32 tid;
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    int pri;
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    ARCH_THREAD_DATA;
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    __u8 *kstack;
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    __u8 *ustack;
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};
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extern spinlock_t threads_lock;
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extern link_t threads_head;
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static void cushion(void);
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extern void thread_init(void);
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extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags);
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extern void thread_ready(thread_t *t);
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extern void thread_exit(void);
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extern void thread_sleep(__u32 sec);
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extern void thread_usleep(__u32 usec);
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extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
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#endif