source: mainline/kernel/generic/include/proc/task.h@ 0aa1665

/*
 * 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

/** @}
 */