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/*
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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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/** @addtogroup genericproc
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_TASK_H_
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#define KERN_TASK_H_
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#include <cpu.h>
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#include <ipc/ipc.h>
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#include <synch/spinlock.h>
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#include <synch/mutex.h>
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#include <synch/rwlock.h>
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#include <synch/futex.h>
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#include <adt/avl.h>
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#include <adt/btree.h>
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#include <adt/list.h>
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#include <security/cap.h>
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#include <arch/proc/task.h>
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#include <arch/proc/thread.h>
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#include <arch/context.h>
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#include <arch/fpu_context.h>
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#include <arch/cpu.h>
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#include <mm/tlb.h>
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#include <proc/scheduler.h>
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struct thread;
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/** Task structure. */
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typedef struct task {
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    /** Task's linkage for the tasks_tree AVL tree. */
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    avltree_node_t tasks_tree_node;
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    /** Task lock.
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     *
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     * Must be acquired before threads_lock and thread lock of any of its
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     * threads.
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     */
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    SPINLOCK_DECLARE(lock);
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    char *name;
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    /** List of threads contained in this task. */
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    link_t th_head;
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    /** Address space. */
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    as_t *as;
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    /** Unique identity of task. */
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    task_id_t taskid;
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    /** Task security context. */
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    context_id_t context;  
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    /** Number of references (i.e. threads). */
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    atomic_t refcount;
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    /** Number of threads that haven't exited yet. */
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    atomic_t lifecount;
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    /** Task capabilities. */
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    cap_t capabilities;
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    /* IPC stuff */
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    answerbox_t answerbox;  /**< Communication endpoint */
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    phone_t phones[IPC_MAX_PHONES];
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    /**
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     * Active asynchronous messages. It is used for limiting uspace to
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     * certain extent.
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     */
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    atomic_t active_calls;
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    /** Architecture specific task data. */
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    task_arch_t arch;
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    /**
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     * Serializes access to the B+tree of task's futexes. This mutex is
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     * independent on the task spinlock.
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     */
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    mutex_t futexes_lock;
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    /** B+tree of futexes referenced by this task. */
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    btree_t futexes;   
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    /** Accumulated accounting. */
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    uint64_t cycles;
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} task_t;
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SPINLOCK_EXTERN(tasks_lock);
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extern avltree_t tasks_tree;
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extern void task_init(void);
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extern void task_done(void);
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extern task_t *task_create(as_t *as, char *name);
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extern void task_destroy(task_t *t);
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extern task_t *task_find_by_id(task_id_t id);
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extern int task_kill(task_id_t id);
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extern uint64_t task_get_accounting(task_t *t);
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extern void cap_set(task_t *t, cap_t caps);
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extern cap_t cap_get(task_t *t);
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#ifndef task_create_arch
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extern void task_create_arch(task_t *t);
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#endif
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#ifndef task_destroy_arch
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extern void task_destroy_arch(task_t *t);
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#endif
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extern unative_t sys_task_get_id(task_id_t *uspace_task_id);
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#endif
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/** @}
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 */