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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * 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.

 */

#ifndef __THREAD_H__

#define __THREAD_H__

#include <arch/thread.h>

#include <synch/spinlock.h>

#include <arch/context.h>

#include <fpu_context.h>

#include <arch/types.h>

#include <typedefs.h>

#include <time/timeout.h>

#include <synch/rwlock.h>

#include <config.h>

#include <adt/list.h>

#include <mm/slab.h>

#define THREAD_STACK_SIZE   STACK_SIZE

enum state {

    Invalid,    /**< It is an error, if thread is found in this state. */

    Running,    /**< State of a thread that is currently executing on some CPU. */

    Sleeping,   /**< Thread in this state is waiting for an event. */

    Ready,      /**< State of threads in a run queue. */

    Entering,   /**< Threads are in this state before they are first readied. */

    Exiting     /**< After a thread calls thread_exit(), it is put into Exiting state. */

};

extern char *thread_states[];

#define X_WIRED     (1<<0)

#define X_STOLEN    (1<<1)

#define THREAD_NAME_BUFLEN  20

/** Thread structure. There is one per thread. */

struct thread {

    link_t rq_link;             /**< Run queue link. */

    link_t wq_link;             /**< Wait queue link. */

    link_t th_link;             /**< Links to threads within containing task. */

    link_t threads_link;            /**< Link to the list of all threads. */

    /** Lock protecting thread structure.

     *

     * Protects the whole thread structure except list links above.

     * Must be acquired before T.lock for each T of type task_t.

     *

     */

    SPINLOCK_DECLARE(lock);

    char name[THREAD_NAME_BUFLEN];

    void (* thread_code)(void *);       /**< Function implementing the thread. */

    void *thread_arg;           /**< Argument passed to thread_code() function. */

    context_t saved_context;        /**< From here, the stored context is restored when the thread is scheduled. */

    context_t sleep_timeout_context;    /**< From here, the stored failover context is restored when sleep times out. */

    waitq_t *sleep_queue;           /**< Wait queue in which this thread sleeps. */

    timeout_t sleep_timeout;        /**< Timeout used for timeoutable sleeping.  */

    volatile int timeout_pending;       /**< Flag signalling sleep timeout in progress. */

    fpu_context_t *saved_fpu_context;

    int fpu_context_exists;

    /*

     * Defined only if thread doesn't run.

     * It means that fpu context is in CPU that last time executes this thread.

     * This disables migration

     */

    int fpu_context_engaged;

    rwlock_type_t rwlock_holder_type;

    void (* call_me)(void *);       /**< Funtion to be called in scheduler before the thread is put asleep. */

    void *call_me_with;         /**< Argument passed to call_me(). */

    state_t state;              /**< Thread's state. */

    int flags;              /**< Thread's flags. */

    cpu_t *cpu;             /**< Thread's CPU. */

    task_t *task;               /**< Containing task. */

    __u64 ticks;                /**< Ticks before preemption. */

    int priority;               /**< Thread's priority. Implemented as index to CPU->rq */

    __u32 tid;              /**< Thread ID. */

    ARCH_THREAD_DATA;           /**< Architecture-specific data. */

    __u8 *kstack;               /**< Thread's kernel stack. */

};

/** Structure passed to uinit kernel thread as argument. */

typedef struct uspace_arg {

    __address uspace_entry;

    __address uspace_stack;

} uspace_arg_t;

/** Thread list lock.

 *

 * This lock protects all link_t structures chained in threads_head.

 * Must be acquired before T.lock for each T of type thread_t.

 *

 */

extern spinlock_t threads_lock;

extern link_t threads_head;         /**< List of all threads in the system. */

extern void thread_init(void);

extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name);

extern void thread_ready(thread_t *t);

extern void thread_exit(void);

extern void thread_sleep(__u32 sec);

extern void thread_usleep(__u32 usec);

extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);

extern void thread_print_list(void);

extern void thread_destroy(thread_t *t);

/* Fpu context slab cache */

extern slab_cache_t *fpu_context_slab;

/** Thread syscall prototypes. */

__native sys_thread_create(__address function, void *arg, void *stack, char *name);

__native sys_thread_exit(int status);

#endif