source: mainline/kernel/generic/include/proc/task.h@ c8cec85

/*
 * Copyright (c) 2010 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 <kobject/kobject.h>
#include <ipc/ipc.h>
#include <ipc/event.h>
#include <ipc/kbox.h>
#include <synch/spinlock.h>
#include <synch/mutex.h>
#include <synch/futex.h>
#include <synch/workqueue.h>
#include <adt/avl.h>
#include <adt/btree.h>
#include <adt/cht.h>
#include <adt/list.h>
#include <security/perm.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>
#include <mm/as.h>
#include <abi/sysinfo.h>
#include <arch.h>

#define TASK                 THE->task


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.
         */
        IRQ_SPINLOCK_DECLARE(lock);
        
        char name[TASK_NAME_BUFLEN];
        /** List of threads contained in this task. */
        list_t threads;
        /** Address space. */
        as_t *as;
        /** Unique identity of task. */
        task_id_t taskid;
        /** Task security container. */
        container_id_t container;
        
        /** Number of references (i.e. threads). */
        atomic_t refcount;
        /** Number of threads that haven't exited yet. */
        atomic_t lifecount;
        
        /** Task permissions. */
        perm_t perms;

        /** Sending communication endpoints */
        kobject_t kobject[MAX_KERNEL_OBJECTS];
        
        /* IPC stuff */

        /** Receiving communication endpoint */
        answerbox_t answerbox;

        /** Sending communication endpoints */
        phone_t phones[IPC_MAX_PHONES];

        /** Spinlock protecting the active_calls list. */
        SPINLOCK_DECLARE(active_calls_lock);

        /**
         * List of all calls sent by this task that have not yet been
         * answered.
         */
        list_t active_calls;

        event_t events[EVENT_TASK_END - EVENT_END];

        /** IPC statistics */
        stats_ipc_t ipc_info;
        
#ifdef CONFIG_UDEBUG
        /** Debugging stuff. */
        udebug_task_t udebug;
        
        /** Kernel answerbox. */
        kbox_t kb;
#endif /* CONFIG_UDEBUG */
        
        /** Architecture specific task data. */
        task_arch_t arch;
        
        struct futex_cache {
                /** CHT mapping virtual addresses of futex variables to futex objects.*/
                cht_t ht;
                /** Serializes access to futex_list.*/
                SPINLOCK_DECLARE(list_lock);
                /** List of all futexes accesses by this task. */
                list_t list;
                work_t destroy_work;
        } *futexes;
        
        /** Accumulated accounting. */
        uint64_t ucycles;
        uint64_t kcycles;
} task_t;

IRQ_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 *, const char *);
extern void task_destroy(task_t *);
extern void task_hold(task_t *);
extern void task_release(task_t *);
extern task_t *task_find_by_id(task_id_t);
extern int task_kill(task_id_t);
extern void task_kill_self(bool) __attribute__((noreturn));
extern void task_get_accounting(task_t *, uint64_t *, uint64_t *);
extern void task_print_list(bool);

extern void perm_set(task_t *, perm_t);
extern perm_t perm_get(task_t *);

#ifndef task_create_arch
extern void task_create_arch(task_t *);
#endif

#ifndef task_destroy_arch
extern void task_destroy_arch(task_t *);
#endif

#ifdef __32_BITS__
extern sysarg_t sys_task_get_id(sysarg64_t *);
#endif

#ifdef __64_BITS__
extern sysarg_t sys_task_get_id(void);
#endif

extern sysarg_t sys_task_set_name(const char *, size_t);
extern sysarg_t sys_task_kill(task_id_t *);
extern sysarg_t sys_task_exit(sysarg_t);

#endif

/** @}
 */