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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.

 */

/** @addtogroup genericproc

 * @{

 */

/** @file

 */

#ifndef KERN_TASK_H_

#define KERN_TASK_H_

#include <cpu.h>

#include <ipc/ipc.h>

#include <synch/spinlock.h>

#include <synch/mutex.h>

#include <synch/rwlock.h>

#include <synch/futex.h>

#include <adt/avl.h>

#include <adt/btree.h>

#include <adt/list.h>

#include <security/cap.h>

#include <arch/proc/task.h>

#include <arch/proc/thread.h>

#include <arch/context.h>

#include <arch/fpu_context.h>

#include <arch/cpu.h>

#include <mm/tlb.h>

#include <proc/scheduler.h>

#include <udebug/udebug.h>

#define TASK_NAME_BUFLEN    20

struct thread;

/** Task structure. */

typedef struct task {

    /** Task's linkage for the tasks_tree AVL tree. */

    avltree_node_t tasks_tree_node;

    /** Task lock.

     *

     * Must be acquired before threads_lock and thread lock of any of its

     * threads.

     */

    SPINLOCK_DECLARE(lock);

    char name[TASK_NAME_BUFLEN];

    /** List of threads contained in this task. */

    link_t th_head;

    /** Address space. */

    as_t *as;

    /** Unique identity of task. */

    task_id_t taskid;

    /** Task security context. */

    context_id_t context;  

    /** Number of references (i.e. threads). */

    atomic_t refcount;

    /** Number of threads that haven't exited yet. */

    atomic_t lifecount;

    /** Task capabilities. */

    cap_t capabilities;

    /* IPC stuff */

    answerbox_t answerbox;  /**< Communication endpoint */

    phone_t phones[IPC_MAX_PHONES];

    /**

     * Active asynchronous messages. It is used for limiting uspace to

     * certain extent.

     */

    atomic_t active_calls;

#ifdef CONFIG_UDEBUG

    /** Debugging stuff */

    udebug_task_t udebug;

    /** Kernel answerbox */

    answerbox_t kernel_box;

    /** Thread used to service kernel answerbox */

    struct thread *kb_thread;

    /** Kbox thread creation vs. begin of cleanup mutual exclusion */

    mutex_t kb_cleanup_lock;

    /** True if cleanup of kbox has already started */

    bool kb_finished;

#endif

    /** Architecture specific task data. */

    task_arch_t arch;

    /**

     * Serializes access to the B+tree of task's futexes. This mutex is

     * independent on the task spinlock.

     */

    mutex_t futexes_lock;

    /** B+tree of futexes referenced by this task. */

    btree_t futexes;   

    /** Accumulated accounting. */

    uint64_t cycles;

} task_t;

SPINLOCK_EXTERN(tasks_lock);

extern avltree_t tasks_tree;

extern void task_init(void);

extern void task_done(void);

extern task_t *task_create(as_t *as, char *name);

extern void task_destroy(task_t *t);

extern task_t *task_find_by_id(task_id_t id);

extern int task_kill(task_id_t id);

extern uint64_t task_get_accounting(task_t *t);

extern void cap_set(task_t *t, cap_t caps);

extern cap_t cap_get(task_t *t);

#ifndef task_create_arch

extern void task_create_arch(task_t *t);

#endif

#ifndef task_destroy_arch

extern void task_destroy_arch(task_t *t);

#endif

extern unative_t sys_task_get_id(task_id_t *uspace_task_id);

#endif

/** @}

 */