WebSVN – HelenOS – Diff – /branches/dynload/kernel/generic/src/proc/task.c


/*
 * 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
 * @brief   Task management.
 */
 
#include <main/uinit.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <proc/uarg.h>
#include <mm/as.h>
#include <mm/slab.h>
#include <atomic.h>
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <arch.h>
#include <panic.h>
#include <adt/avl.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <ipc/ipc.h>
#include <ipc/ipcrsc.h>
#include <security/cap.h>
#include <memstr.h>
#include <print.h>
#include <lib/elf.h>
#include <errno.h>
#include <func.h>
#include <syscall/copy.h>
 
#ifndef LOADED_PROG_STACK_PAGES_NO
#define LOADED_PROG_STACK_PAGES_NO 1
#endif
 
/** Spinlock protecting the tasks_tree AVL tree. */
SPINLOCK_INITIALIZE(tasks_lock);
 
/** AVL tree of active tasks.
 *
 * The task is guaranteed to exist after it was found in the tasks_tree as
 * long as:
 * @li the tasks_lock is held,
 * @li the task's lock is held when task's lock is acquired before releasing
 *     tasks_lock or
 * @li the task's refcount is greater than 0
 *
 */
avltree_t tasks_tree;
 
static task_id_t task_counter = 0;
 
/**
 * Points to the binary image used as the program loader. All non-initial
 * tasks are created from this executable image.
 */
void *program_loader = NULL;
 
 
/** Initialize tasks
 *
 * Initialize kernel tasks support.
 *
 */
void task_init(void)
{
    TASK = NULL;
    avltree_create(&tasks_tree);
}
 
/*
 * The idea behind this walker is to remember a single task different from TASK.
 */
static bool task_done_walker(avltree_node_t *node, void *arg)
{
    task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
    task_t **tp = (task_t **) arg;
 
    if (t != TASK) {
        *tp = t;
        return false;   /* stop walking */
    }
 
    return true;    /* continue the walk */
}
 
/** Kill all tasks except the current task.
 *
 */
void task_done(void)
{
    task_t *t;
    do { /* Repeat until there are any tasks except TASK */
       
        /* Messing with task structures, avoid deadlock */
        ipl_t ipl = interrupts_disable();
        spinlock_lock(&tasks_lock);
       
        t = NULL;
        avltree_walk(&tasks_tree, task_done_walker, &t);
       
        if (t != NULL) {
            task_id_t id = t->taskid;
           
            spinlock_unlock(&tasks_lock);
            interrupts_restore(ipl);
           
#ifdef CONFIG_DEBUG
            printf("Killing task %" PRIu64 "\n", id);
#endif          
            task_kill(id);
            thread_usleep(10000);
        } else {
            spinlock_unlock(&tasks_lock);
            interrupts_restore(ipl);
        }
       
    } while (t != NULL);
}
 
/** Create new task
 *
 * Create new task with no threads.
 *
 * @param as Task's address space.
 * @param name Symbolic name.
 *
 * @return New task's structure
 *
 */
task_t *task_create(as_t *as, char *name)
{
    ipl_t ipl;
    task_t *ta;
    int i;
   
    ta = (task_t *) malloc(sizeof(task_t), 0);
 
    task_create_arch(ta);
 
    spinlock_initialize(&ta->lock, "task_ta_lock");
    list_initialize(&ta->th_head);
    ta->as = as;
    ta->name = name;
    atomic_set(&ta->refcount, 0);
    atomic_set(&ta->lifecount, 0);
    ta->context = CONTEXT;
 
    ta->capabilities = 0;
    ta->cycles = 0;
   
    ipc_answerbox_init(&ta->answerbox, ta);
    for (i = 0; i < IPC_MAX_PHONES; i++)
        ipc_phone_init(&ta->phones[i]);
    if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,
        ta->context)))
        ipc_phone_connect(&ta->phones[0], ipc_phone_0);
    atomic_set(&ta->active_calls, 0);
 
    mutex_initialize(&ta->futexes_lock);
    btree_create(&ta->futexes);
   
    ipl = interrupts_disable();
 
    /*
     * Increment address space reference count.
     */
    atomic_inc(&as->refcount);
 
    spinlock_lock(&tasks_lock);
    ta->taskid = ++task_counter;
    avltree_node_initialize(&ta->tasks_tree_node);
    ta->tasks_tree_node.key = ta->taskid;
    avltree_insert(&tasks_tree, &ta->tasks_tree_node);
    spinlock_unlock(&tasks_lock);
    interrupts_restore(ipl);
 
    return ta;
}
 
/** Destroy task.
 *
 * @param t Task to be destroyed.
 */
void task_destroy(task_t *t)
{
    /*
     * Remove the task from the task B+tree.
     */
    spinlock_lock(&tasks_lock);
    avltree_delete(&tasks_tree, &t->tasks_tree_node);
    spinlock_unlock(&tasks_lock);
 
    /*
     * Perform architecture specific task destruction.
     */
    task_destroy_arch(t);
 
    /*
     * Free up dynamically allocated state.
     */
    btree_destroy(&t->futexes);
 
    /*
     * Drop our reference to the address space.
     */
    if (atomic_predec(&t->as->refcount) == 0)
        as_destroy(t->as);
   
    free(t);
    TASK = NULL;
}
 
/** Create new task with 1 thread and run it
 *
 * @param as Address space containing a binary program image.
 * @param entry_addr Program entry-point address in program address space.
 * @param name Program name.
 *
 * @return Task of the running program or NULL on error.
 */
task_t *task_create_from_as(as_t *as, uintptr_t entry_addr, char *name
    thread_t **thr)
{
    as_area_t *a;
    thread_t *t;
    task_t *task;
    uspace_arg_t *kernel_uarg;
 
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    kernel_uarg->uspace_entry = (void *) entry_addr;
    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
    kernel_uarg->uspace_thread_function = NULL;
    kernel_uarg->uspace_thread_arg = NULL;
    kernel_uarg->uspace_uarg = NULL;
   
    task = task_create(as, name);
    ASSERT(task);
 
    /*
     * Create the data as_area.
     */
    a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
        LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
        AS_AREA_ATTR_NONE, &anon_backend, NULL);
 
    /*
     * Create the main thread.
     */
    t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
        "uinit", false);
    ASSERT(t);
 
    *thr = t;
   
    return task;
}
 
/** Parse an executable image in the physical memory.
 *
 * If the image belongs to a program loader, it is registered as such,
 * (and *task is set to NULL). Otherwise a task is created from the
 * executable image. The task is returned in *task.
 *
 * @param program_addr Address of program executable image.
 * @param name Program name.
 * @param task Where to store the pointer to the newly created task.
 *
 * @return EOK on success or negative error code.
 */
int task_parse_initial(void *program_addr, char *name, thread_t **t)
{
    as_t *as;
    unsigned int rc;
    task_t *task;
 
    as = as_create(0);
    ASSERT(as);
 
    rc = elf_load((elf_header_t *) program_addr, as, 0);
    if (rc != EE_OK) {
        as_destroy(as);
        *task = NULL;
        if (rc != EE_LOADER)
            return ENOTSUP;
       
        /* Register image as the program loader */
        ASSERT(program_loader == NULL);
        program_loader = program_addr;
        return EOK;
    }
 
    task = task_create_from_as(as, ((elf_header_t *) program_addr)->e_entry,
        name, t);
 
    return EOK;
}
 
/** Create a task from the program loader image.
 *
 * @param name Program name.
 * @param t Buffer for storing pointer to the newly created task.
 *
 * @return Task of the running program or NULL on error.
 */
int task_create_from_loader(char *name, task_t **t)
{
    as_t *as;
    unsigned int rc;
    void *loader;
 
    as = as_create(0);
    ASSERT(as);
 
    loader = program_loader;
    if (!loader) return ENOENT;
 
    rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);
    if (rc != EE_OK) {
        as_destroy(as);
        return ENOENT;
    }
 
    *t = task_create_from_as(
        as, ((elf_header_t *) program_loader)->e_entry, name); 
 
    return EOK;
}
 
/** Make task ready.
 *
 * Switch task's thread to the ready state.
 *
 * @param ta Task to make ready.
 */
void task_ready(task_t *t)
{
    thread_t *th;
 
    th = list_get_instance(t->th_head.next, thread_t, th_link);
    thread_ready(th);
}
 
/** Syscall for reading task ID from userspace.
 *
 * @param uspace_task_id Userspace address of 8-byte buffer where to store
 * current task ID.
 *
 * @return 0 on success or an error code from @ref errno.h.
 */
unative_t sys_task_get_id(task_id_t *uspace_task_id)
{
    /*
     * No need to acquire lock on TASK because taskid
     * remains constant for the lifespan of the task.
     */
    return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
        sizeof(TASK->taskid));
}
 
/** Syscall for creating a new task from userspace.
 *
 * Creates a new task from the program loader image, connects a phone
 * to it and stores the phone id into the provided buffer.
 *
 * @param uspace_phone_id Userspace address where to store the phone id.
 *
 * @return 0 on success or an error code from @ref errno.h.
 */
unative_t sys_task_spawn_loader(int *uspace_phone_id)
{
    task_t *t;
    int fake_id;
    int rc;
    int phone_id;
 
    fake_id = 0;
 
    /* Before we even try creating the task, see if we can write the id */
    rc = (unative_t) copy_to_uspace(uspace_phone_id, &fake_id,
        sizeof(fake_id));
    if (rc != 0)
        return rc;
 
    phone_id = phone_alloc();
    if (phone_id < 0)
        return ELIMIT;
 
    rc = task_create_from_loader("loader", &t);
    if (rc != 0)
        return rc;
 
    phone_connect(phone_id, &t->answerbox);
 
    /* No need to aquire lock before task_ready() */
    rc = (unative_t) copy_to_uspace(uspace_phone_id, &phone_id,
        sizeof(phone_id));
    if (rc != 0) {
        /* Ooops */
        ipc_phone_hangup(&TASK->phones[phone_id]);
        task_kill(t->taskid);
        return rc;
    }
 
    task_ready(t);
 
    return EOK;
}
 
unative_t sys_task_spawn(void *image, size_t size)
{
    void *kimage = malloc(size, 0);
    if (kimage == NULL)
        return ENOMEM;
   
    int rc = copy_from_uspace(kimage, image, size);
    if (rc != EOK)
        return rc;
   
    uspace_arg_t *kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    if (kernel_uarg == NULL) {
        free(kimage);
        return ENOMEM;
    }
   
    kernel_uarg->uspace_entry =
        (void *) ((elf_header_t *) kimage)->e_entry;
    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
    kernel_uarg->uspace_thread_function = NULL;
    kernel_uarg->uspace_thread_arg = NULL;
    kernel_uarg->uspace_uarg = NULL;
   
    as_t *as = as_create(0);
    if (as == NULL) {
        free(kernel_uarg);
        free(kimage);
        return ENOMEM;
    }
   
    unsigned int erc = elf_load((elf_header_t *) kimage, as);
    if (erc != EE_OK) {
        as_destroy(as);
        free(kernel_uarg);
        free(kimage);
        return ENOENT;
    }
   
    as_area_t *area = as_area_create(as,
        AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
        LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
        AS_AREA_ATTR_NONE, &anon_backend, NULL);
    if (area == NULL) {
        as_destroy(as);
        free(kernel_uarg);
        free(kimage);
        return ENOMEM;
    }
   
    task_t *task = task_create(as, "app");
    if (task == NULL) {
        as_destroy(as);
        free(kernel_uarg);
        free(kimage);
        return ENOENT;
    }
   
    // FIXME: control the capabilities
    cap_set(task, cap_get(TASK));
   
    thread_t *thread = thread_create(uinit, kernel_uarg, task,
        THREAD_FLAG_USPACE, "user", false);
    if (thread == NULL) {
        task_destroy(task);
        as_destroy(as);
        free(kernel_uarg);
        free(kimage);
        return ENOENT;
    }
   
    thread_ready(thread);
   
    return EOK;
}
 
/** Find task structure corresponding to task ID.
 *
 * The tasks_lock must be already held by the caller of this function
 * and interrupts must be disabled.
 *
 * @param id Task ID.
 *
 * @return Task structure address or NULL if there is no such task ID.
 */
task_t *task_find_by_id(task_id_t id)
{
    avltree_node_t *node;
   
    node = avltree_search(&tasks_tree, (avltree_key_t) id);
 
    if (node)
        return avltree_get_instance(node, task_t, tasks_tree_node);
    return NULL;
}
 
/** Get accounting data of given task.
 *
 * Note that task lock of 't' must be already held and
 * interrupts must be already disabled.
 *
 * @param t Pointer to thread.
 *
 */
uint64_t task_get_accounting(task_t *t)
{
    /* Accumulated value of task */
    uint64_t ret = t->cycles;
   
    /* Current values of threads */
    link_t *cur;
    for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {
        thread_t *thr = list_get_instance(cur, thread_t, th_link);
       
        spinlock_lock(&thr->lock);
        /* Process only counted threads */
        if (!thr->uncounted) {
            if (thr == THREAD) {
                /* Update accounting of current thread */
                thread_update_accounting();
            }
            ret += thr->cycles;
        }
        spinlock_unlock(&thr->lock);
    }
   
    return ret;
}
 
/** Kill task.
 *
 * This function is idempotent.
 * It signals all the task's threads to bail it out.
 *
 * @param id ID of the task to be killed.
 *
 * @return 0 on success or an error code from errno.h
 */
int task_kill(task_id_t id)
{
    ipl_t ipl;
    task_t *ta;
    link_t *cur;
 
    if (id == 1)
        return EPERM;
   
    ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
    if (!(ta = task_find_by_id(id))) {
        spinlock_unlock(&tasks_lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
    spinlock_unlock(&tasks_lock);
   
    /*
     * Interrupt all threads except ktaskclnp.
     */
    spinlock_lock(&ta->lock);
    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
        thread_t *thr;
        bool sleeping = false;
       
        thr = list_get_instance(cur, thread_t, th_link);
           
        spinlock_lock(&thr->lock);
        thr->interrupted = true;
        if (thr->state == Sleeping)
            sleeping = true;
        spinlock_unlock(&thr->lock);
       
        if (sleeping)
            waitq_interrupt_sleep(thr);
    }
    spinlock_unlock(&ta->lock);
    interrupts_restore(ipl);
   
    return 0;
}
 
static bool task_print_walker(avltree_node_t *node, void *arg)
{
    task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
    int j;
       
    spinlock_lock(&t->lock);
           
    uint64_t cycles;
    char suffix;
    order(task_get_accounting(t), &cycles, &suffix);
 
#ifdef __32_BITS__  
    printf("%-6" PRIu64 " %-10s %-3" PRIu32 " %10p %10p %9" PRIu64 "%c %7ld %6ld",
        t->taskid, t->name, t->context, t, t->as, cycles, suffix,
        atomic_get(&t->refcount), atomic_get(&t->active_calls));
#endif
 
#ifdef __64_BITS__
    printf("%-6" PRIu64 " %-10s %-3" PRIu32 " %18p %18p %9" PRIu64 "%c %7ld %6ld",
        t->taskid, t->name, t->context, t, t->as, cycles, suffix,
        atomic_get(&t->refcount), atomic_get(&t->active_calls));
#endif
 
    for (j = 0; j < IPC_MAX_PHONES; j++) {
        if (t->phones[j].callee)
            printf(" %d:%p", j, t->phones[j].callee);
    }
    printf("\n");
           
    spinlock_unlock(&t->lock);
    return true;
}
 
/** Print task list */
void task_print_list(void)
{
    ipl_t ipl;
   
    /* Messing with task structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
 
#ifdef __32_BITS__  
    printf("taskid name       ctx address    as         "
        "cycles     threads calls  callee\n");
    printf("------ ---------- --- ---------- ---------- "
        "---------- ------- ------ ------>\n");
#endif
 
#ifdef __64_BITS__
    printf("taskid name       ctx address            as                 "
        "cycles     threads calls  callee\n");
    printf("------ ---------- --- ------------------ ------------------ "
        "---------- ------- ------ ------>\n");
#endif
 
    avltree_walk(&tasks_tree, task_print_walker, NULL);
 
    spinlock_unlock(&tasks_lock);
    interrupts_restore(ipl);
}
 
/** @}
 */
 

Rev 3004	Rev 3149
1	/*	1	/*
2	* Copyright (c) 2001-2004 Jakub Jermar	2	* Copyright (c) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup genericproc	29	/** @addtogroup genericproc
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Task management.	35	* @brief Task management.
36	*/	36	*/
37		37
38	#include <main/uinit.h>	38	#include <main/uinit.h>
39	#include <proc/thread.h>	39	#include <proc/thread.h>
40	#include <proc/task.h>	40	#include <proc/task.h>
41	#include <proc/uarg.h>	41	#include <proc/uarg.h>
42	#include <mm/as.h>	42	#include <mm/as.h>
43	#include <mm/slab.h>	43	#include <mm/slab.h>
44	#include <atomic.h>	44	#include <atomic.h>
45	#include <synch/spinlock.h>	45	#include <synch/spinlock.h>
46	#include <synch/waitq.h>	46	#include <synch/waitq.h>
47	#include <arch.h>	47	#include <arch.h>
48	#include <panic.h>	48	#include <panic.h>
49	#include <adt/avl.h>	49	#include <adt/avl.h>
50	#include <adt/btree.h>	50	#include <adt/btree.h>
51	#include <adt/list.h>	51	#include <adt/list.h>
52	#include <ipc/ipc.h>	52	#include <ipc/ipc.h>
53	#include <ipc/ipcrsc.h>	53	#include <ipc/ipcrsc.h>
54	#include <security/cap.h>	54	#include <security/cap.h>
55	#include <memstr.h>	55	#include <memstr.h>
56	#include <print.h>	56	#include <print.h>
57	#include <lib/elf.h>	57	#include <lib/elf.h>
58	#include <errno.h>	58	#include <errno.h>
59	#include <func.h>	59	#include <func.h>
60	#include <syscall/copy.h>	60	#include <syscall/copy.h>
61		61
62	#ifndef LOADED_PROG_STACK_PAGES_NO	62	#ifndef LOADED_PROG_STACK_PAGES_NO
63	#define LOADED_PROG_STACK_PAGES_NO 1	63	#define LOADED_PROG_STACK_PAGES_NO 1
64	#endif	64	#endif
65		65
66	/** Spinlock protecting the tasks_tree AVL tree. */	66	/** Spinlock protecting the tasks_tree AVL tree. */
67	SPINLOCK_INITIALIZE(tasks_lock);	67	SPINLOCK_INITIALIZE(tasks_lock);
68		68
69	/** AVL tree of active tasks.	69	/** AVL tree of active tasks.
70	*	70	*
71	* The task is guaranteed to exist after it was found in the tasks_tree as	71	* The task is guaranteed to exist after it was found in the tasks_tree as
72	* long as:	72	* long as:
73	* @li the tasks_lock is held,	73	* @li the tasks_lock is held,
74	* @li the task's lock is held when task's lock is acquired before releasing	74	* @li the task's lock is held when task's lock is acquired before releasing
75	* tasks_lock or	75	* tasks_lock or
76	* @li the task's refcount is greater than 0	76	* @li the task's refcount is greater than 0
77	*	77	*
78	*/	78	*/
79	avltree_t tasks_tree;	79	avltree_t tasks_tree;
80		80
81	static task_id_t task_counter = 0;	81	static task_id_t task_counter = 0;
82		82
83	/**	83	/**
84	* Points to the binary image used as the program loader. All non-initial	84	* Points to the binary image used as the program loader. All non-initial
85	* tasks are created from this executable image.	85	* tasks are created from this executable image.
86	*/	86	*/
87	void *program_loader = NULL;	87	void *program_loader = NULL;
88		88
89		89
90	/** Initialize tasks	90	/** Initialize tasks
91	*	91	*
92	* Initialize kernel tasks support.	92	* Initialize kernel tasks support.
93	*	93	*
94	*/	94	*/
95	void task_init(void)	95	void task_init(void)
96	{	96	{
97	TASK = NULL;	97	TASK = NULL;
98	avltree_create(&tasks_tree);	98	avltree_create(&tasks_tree);
99	}	99	}
100		100
101	/*	101	/*
102	* The idea behind this walker is to remember a single task different from TASK.	102	* The idea behind this walker is to remember a single task different from TASK.
103	*/	103	*/
104	static bool task_done_walker(avltree_node_t node, void arg)	104	static bool task_done_walker(avltree_node_t node, void arg)
105	{	105	{
106	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);	106	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
107	task_t tp = (task_t ) arg;	107	task_t tp = (task_t ) arg;
108		108
109	if (t != TASK) {	109	if (t != TASK) {
110	*tp = t;	110	*tp = t;
111	return false; /* stop walking */	111	return false; /* stop walking */
112	}	112	}
113		113
114	return true; /* continue the walk */	114	return true; /* continue the walk */
115	}	115	}
116		116
117	/** Kill all tasks except the current task.	117	/** Kill all tasks except the current task.
118	*	118	*
119	*/	119	*/
120	void task_done(void)	120	void task_done(void)
121	{	121	{
122	task_t *t;	122	task_t *t;
123	do { /* Repeat until there are any tasks except TASK */	123	do { /* Repeat until there are any tasks except TASK */
124		124
125	/* Messing with task structures, avoid deadlock */	125	/* Messing with task structures, avoid deadlock */
126	ipl_t ipl = interrupts_disable();	126	ipl_t ipl = interrupts_disable();
127	spinlock_lock(&tasks_lock);	127	spinlock_lock(&tasks_lock);
128		128
129	t = NULL;	129	t = NULL;
130	avltree_walk(&tasks_tree, task_done_walker, &t);	130	avltree_walk(&tasks_tree, task_done_walker, &t);
131		131
132	if (t != NULL) {	132	if (t != NULL) {
133	task_id_t id = t->taskid;	133	task_id_t id = t->taskid;
134		134
135	spinlock_unlock(&tasks_lock);	135	spinlock_unlock(&tasks_lock);
136	interrupts_restore(ipl);	136	interrupts_restore(ipl);
137		137
138	#ifdef CONFIG_DEBUG	138	#ifdef CONFIG_DEBUG
139	printf("Killing task %llu\n", id);	139	printf("Killing task %" PRIu64 "\n", id);
140	#endif	140	#endif
141	task_kill(id);	141	task_kill(id);
142	thread_usleep(10000);	142	thread_usleep(10000);
143	} else {	143	} else {
144	spinlock_unlock(&tasks_lock);	144	spinlock_unlock(&tasks_lock);
145	interrupts_restore(ipl);	145	interrupts_restore(ipl);
146	}	146	}
147		147
148	} while (t != NULL);	148	} while (t != NULL);
149	}	149	}
150		150
151	/** Create new task	151	/** Create new task
152	*	152	*
153	* Create new task with no threads.	153	* Create new task with no threads.
154	*	154	*
155	* @param as Task's address space.	155	* @param as Task's address space.
156	* @param name Symbolic name.	156	* @param name Symbolic name.
157	*	157	*
158	* @return New task's structure	158	* @return New task's structure
159	*	159	*
160	*/	160	*/
161	task_t task_create(as_t as, char *name)	161	task_t task_create(as_t as, char *name)
162	{	162	{
163	ipl_t ipl;	163	ipl_t ipl;
164	task_t *ta;	164	task_t *ta;
165	int i;	165	int i;
166		166
167	ta = (task_t *) malloc(sizeof(task_t), 0);	167	ta = (task_t *) malloc(sizeof(task_t), 0);
168		168
169	task_create_arch(ta);	169	task_create_arch(ta);
170		170
171	spinlock_initialize(&ta->lock, "task_ta_lock");	171	spinlock_initialize(&ta->lock, "task_ta_lock");
172	list_initialize(&ta->th_head);	172	list_initialize(&ta->th_head);
173	ta->as = as;	173	ta->as = as;
174	ta->name = name;	174	ta->name = name;
175	atomic_set(&ta->refcount, 0);	175	atomic_set(&ta->refcount, 0);
176	atomic_set(&ta->lifecount, 0);	176	atomic_set(&ta->lifecount, 0);
177	ta->context = CONTEXT;	177	ta->context = CONTEXT;
178		178
179	ta->capabilities = 0;	179	ta->capabilities = 0;
180	ta->cycles = 0;	180	ta->cycles = 0;
181		181
182	ipc_answerbox_init(&ta->answerbox, ta);	182	ipc_answerbox_init(&ta->answerbox, ta);
183	for (i = 0; i < IPC_MAX_PHONES; i++)	183	for (i = 0; i < IPC_MAX_PHONES; i++)
184	ipc_phone_init(&ta->phones[i]);	184	ipc_phone_init(&ta->phones[i]);
185	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,	185	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,
186	ta->context)))	186	ta->context)))
187	ipc_phone_connect(&ta->phones[0], ipc_phone_0);	187	ipc_phone_connect(&ta->phones[0], ipc_phone_0);
188	atomic_set(&ta->active_calls, 0);	188	atomic_set(&ta->active_calls, 0);
189		189
190	mutex_initialize(&ta->futexes_lock);	190	mutex_initialize(&ta->futexes_lock);
191	btree_create(&ta->futexes);	191	btree_create(&ta->futexes);
192		192
193	ipl = interrupts_disable();	193	ipl = interrupts_disable();
194		194
195	/*	195	/*
196	* Increment address space reference count.	196	* Increment address space reference count.
197	*/	197	*/
198	atomic_inc(&as->refcount);	198	atomic_inc(&as->refcount);
199		199
200	spinlock_lock(&tasks_lock);	200	spinlock_lock(&tasks_lock);
201	ta->taskid = ++task_counter;	201	ta->taskid = ++task_counter;
202	avltree_node_initialize(&ta->tasks_tree_node);	202	avltree_node_initialize(&ta->tasks_tree_node);
203	ta->tasks_tree_node.key = ta->taskid;	203	ta->tasks_tree_node.key = ta->taskid;
204	avltree_insert(&tasks_tree, &ta->tasks_tree_node);	204	avltree_insert(&tasks_tree, &ta->tasks_tree_node);
205	spinlock_unlock(&tasks_lock);	205	spinlock_unlock(&tasks_lock);
206	interrupts_restore(ipl);	206	interrupts_restore(ipl);
207		207
208	return ta;	208	return ta;
209	}	209	}
210		210
211	/** Destroy task.	211	/** Destroy task.
212	*	212	*
213	* @param t Task to be destroyed.	213	* @param t Task to be destroyed.
214	*/	214	*/
215	void task_destroy(task_t *t)	215	void task_destroy(task_t *t)
216	{	216	{
217	/*	217	/*
218	* Remove the task from the task B+tree.	218	* Remove the task from the task B+tree.
219	*/	219	*/
220	spinlock_lock(&tasks_lock);	220	spinlock_lock(&tasks_lock);
221	avltree_delete(&tasks_tree, &t->tasks_tree_node);	221	avltree_delete(&tasks_tree, &t->tasks_tree_node);
222	spinlock_unlock(&tasks_lock);	222	spinlock_unlock(&tasks_lock);
223		223
224	/*	224	/*
225	* Perform architecture specific task destruction.	225	* Perform architecture specific task destruction.
226	*/	226	*/
227	task_destroy_arch(t);	227	task_destroy_arch(t);
228		228
229	/*	229	/*
230	* Free up dynamically allocated state.	230	* Free up dynamically allocated state.
231	*/	231	*/
232	btree_destroy(&t->futexes);	232	btree_destroy(&t->futexes);
233		233
234	/*	234	/*
235	* Drop our reference to the address space.	235	* Drop our reference to the address space.
236	*/	236	*/
237	if (atomic_predec(&t->as->refcount) == 0)	237	if (atomic_predec(&t->as->refcount) == 0)
238	as_destroy(t->as);	238	as_destroy(t->as);
239		239
240	free(t);	240	free(t);
241	TASK = NULL;	241	TASK = NULL;
242	}	242	}
243		243
244	/** Create new task with 1 thread and run it	244	/** Create new task with 1 thread and run it
245	*	245	*
246	* @param as Address space containing a binary program image.	246	* @param as Address space containing a binary program image.
247	* @param entry_addr Program entry-point address in program address space.	247	* @param entry_addr Program entry-point address in program address space.
248	* @param name Program name.	248	* @param name Program name.
249	*	249	*
250	* @return Task of the running program or NULL on error.	250	* @return Task of the running program or NULL on error.
251	*/	251	*/
252	task_t task_create_from_as(as_t as, uintptr_t entry_addr, char *name)	252	task_t task_create_from_as(as_t as, uintptr_t entry_addr, char *name
-		253	thread_t **thr)
253	{	254	{
254	as_area_t *a;	255	as_area_t *a;
255	thread_t *t;	256	thread_t *t;
256	task_t *task;	257	task_t *task;
257	uspace_arg_t *kernel_uarg;	258	uspace_arg_t *kernel_uarg;
258		259
259	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	260	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
260	kernel_uarg->uspace_entry = (void *) entry_addr;	261	kernel_uarg->uspace_entry = (void *) entry_addr;
261	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;	262	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
262	kernel_uarg->uspace_thread_function = NULL;	263	kernel_uarg->uspace_thread_function = NULL;
263	kernel_uarg->uspace_thread_arg = NULL;	264	kernel_uarg->uspace_thread_arg = NULL;
264	kernel_uarg->uspace_uarg = NULL;	265	kernel_uarg->uspace_uarg = NULL;
265		266
266	task = task_create(as, name);	267	task = task_create(as, name);
267	ASSERT(task);	268	ASSERT(task);
268		269
269	/*	270	/*
270	* Create the data as_area.	271	* Create the data as_area.
271	*/	272	*/
272	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,	273	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,
273	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,	274	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
274	AS_AREA_ATTR_NONE, &anon_backend, NULL);	275	AS_AREA_ATTR_NONE, &anon_backend, NULL);
275		276
276	/*	277	/*
277	* Create the main thread.	278	* Create the main thread.
278	*/	279	*/
279	t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,	280	t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
280	"uinit", false);	281	"uinit", false);
281	ASSERT(t);	282	ASSERT(t);
-		283
-		284	*thr = t;
282		285
283	return task;	286	return task;
284	}	287	}
285		288
286	/** Parse an executable image in the physical memory.	289	/** Parse an executable image in the physical memory.
287	*	290	*
288	* If the image belongs to a program loader, it is registered as such,	291	* If the image belongs to a program loader, it is registered as such,
289	* (and *task is set to NULL). Otherwise a task is created from the	292	* (and *task is set to NULL). Otherwise a task is created from the
290	* executable image. The task is returned in *task.	293	* executable image. The task is returned in *task.
291	*	294	*
292	* @param program_addr Address of program executable image.	295	* @param program_addr Address of program executable image.
293	* @param name Program name.	296	* @param name Program name.
294	* @param task Where to store the pointer to the newly created task.	297	* @param task Where to store the pointer to the newly created task.
295	*	298	*
296	* @return EOK on success or negative error code.	299	* @return EOK on success or negative error code.
297	*/	300	*/
298	int task_parse_initial(void program_addr, char name, task_t **task)	301	int task_parse_initial(void program_addr, char name, thread_t **t)
299	{	302	{
300	as_t *as;	303	as_t *as;
301	unsigned int rc;	304	unsigned int rc;
-		305	task_t *task;
302		306
303	as = as_create(0);	307	as = as_create(0);
304	ASSERT(as);	308	ASSERT(as);
305		309
306	rc = elf_load((elf_header_t *) program_addr, as, 0);	310	rc = elf_load((elf_header_t *) program_addr, as, 0);
307	if (rc != EE_OK) {	311	if (rc != EE_OK) {
308	as_destroy(as);	312	as_destroy(as);
309	*task = NULL;	313	*task = NULL;
310	if (rc != EE_LOADER)	314	if (rc != EE_LOADER)
311	return ENOTSUP;	315	return ENOTSUP;
312		316
313	/* Register image as the program loader */	317	/* Register image as the program loader */
314	ASSERT(program_loader == NULL);	318	ASSERT(program_loader == NULL);
315	program_loader = program_addr;	319	program_loader = program_addr;
316	return EOK;	320	return EOK;
317	}	321	}
318		322
319	task = task_create_from_as(as, ((elf_header_t ) program_addr)->e_entry,	323	task = task_create_from_as(as, ((elf_header_t *) program_addr)->e_entry,
320	name);	324	name, t);
321		325
322	return EOK;	326	return EOK;
323	}	327	}
324		328
325	/** Create a task from the program loader image.	329	/** Create a task from the program loader image.
326	*	330	*
327	* @param name Program name.	331	* @param name Program name.
328	* @param t Buffer for storing pointer to the newly created task.	332	* @param t Buffer for storing pointer to the newly created task.
329	*	333	*
330	* @return Task of the running program or NULL on error.	334	* @return Task of the running program or NULL on error.
331	*/	335	*/
332	int task_create_from_loader(char name, task_t *t)	336	int task_create_from_loader(char name, task_t *t)
333	{	337	{
334	as_t *as;	338	as_t *as;
335	unsigned int rc;	339	unsigned int rc;
336	void *loader;	340	void *loader;
337		341
338	as = as_create(0);	342	as = as_create(0);
339	ASSERT(as);	343	ASSERT(as);
340		344
341	loader = program_loader;	345	loader = program_loader;
342	if (!loader) return ENOENT;	346	if (!loader) return ENOENT;
343		347
344	rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);	348	rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);
345	if (rc != EE_OK) {	349	if (rc != EE_OK) {
346	as_destroy(as);	350	as_destroy(as);
347	return ENOENT;	351	return ENOENT;
348	}	352	}
349		353
350	*t = task_create_from_as(	354	*t = task_create_from_as(
351	as, ((elf_header_t *) program_loader)->e_entry, name);	355	as, ((elf_header_t *) program_loader)->e_entry, name);
352		356
353	return EOK;	357	return EOK;
354	}	358	}
355		359
356	/** Make task ready.	360	/** Make task ready.
357	*	361	*
358	* Switch task's thread to the ready state.	362	* Switch task's thread to the ready state.
359	*	363	*
360	* @param ta Task to make ready.	364	* @param ta Task to make ready.
361	*/	365	*/
362	void task_ready(task_t *t)	366	void task_ready(task_t *t)
363	{	367	{
364	thread_t *th;	368	thread_t *th;
365		369
366	th = list_get_instance(t->th_head.next, thread_t, th_link);	370	th = list_get_instance(t->th_head.next, thread_t, th_link);
367	thread_ready(th);	371	thread_ready(th);
368	}	372	}
369		373
370	/** Syscall for reading task ID from userspace.	374	/** Syscall for reading task ID from userspace.
371	*	375	*
372	* @param uspace_task_id Userspace address of 8-byte buffer where to store	376	* @param uspace_task_id Userspace address of 8-byte buffer where to store
373	* current task ID.	377	* current task ID.
374	*	378	*
375	* @return 0 on success or an error code from @ref errno.h.	379	* @return 0 on success or an error code from @ref errno.h.
376	*/	380	*/
377	unative_t sys_task_get_id(task_id_t *uspace_task_id)	381	unative_t sys_task_get_id(task_id_t *uspace_task_id)
378	{	382	{
379	/*	383	/*
380	* No need to acquire lock on TASK because taskid	384	* No need to acquire lock on TASK because taskid
381	* remains constant for the lifespan of the task.	385	* remains constant for the lifespan of the task.
382	*/	386	*/
383	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,	387	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
384	sizeof(TASK->taskid));	388	sizeof(TASK->taskid));
385	}	389	}
386		390
387	/** Syscall for creating a new task from userspace.	391	/** Syscall for creating a new task from userspace.
388	*	392	*
389	* Creates a new task from the program loader image, connects a phone	393	* Creates a new task from the program loader image, connects a phone
390	* to it and stores the phone id into the provided buffer.	394	* to it and stores the phone id into the provided buffer.
391	*	395	*
392	* @param uspace_phone_id Userspace address where to store the phone id.	396	* @param uspace_phone_id Userspace address where to store the phone id.
393	*	397	*
394	* @return 0 on success or an error code from @ref errno.h.	398	* @return 0 on success or an error code from @ref errno.h.
395	*/	399	*/
396	unative_t sys_task_spawn(int *uspace_phone_id)	400	unative_t sys_task_spawn_loader(int *uspace_phone_id)
397	{	401	{
398	task_t *t;	402	task_t *t;
399	int fake_id;	403	int fake_id;
400	int rc;	404	int rc;
401	int phone_id;	405	int phone_id;
402		406
403	fake_id = 0;	407	fake_id = 0;
404		408
405	/* Before we even try creating the task, see if we can write the id */	409	/* Before we even try creating the task, see if we can write the id */
406	rc = (unative_t) copy_to_uspace(uspace_phone_id, &fake_id,	410	rc = (unative_t) copy_to_uspace(uspace_phone_id, &fake_id,
407	sizeof(fake_id));	411	sizeof(fake_id));
408	if (rc != 0)	412	if (rc != 0)
409	return rc;	413	return rc;
410		414
411	phone_id = phone_alloc();	415	phone_id = phone_alloc();
412	if (phone_id < 0)	416	if (phone_id < 0)
413	return ELIMIT;	417	return ELIMIT;
414		418
415	rc = task_create_from_loader("loader", &t);	419	rc = task_create_from_loader("loader", &t);
416	if (rc != 0)	420	if (rc != 0)
417	return rc;	421	return rc;
418		422
419	phone_connect(phone_id, &t->answerbox);	423	phone_connect(phone_id, &t->answerbox);
420		424
421	/* No need to aquire lock before task_ready() */	425	/* No need to aquire lock before task_ready() */
422	rc = (unative_t) copy_to_uspace(uspace_phone_id, &phone_id,	426	rc = (unative_t) copy_to_uspace(uspace_phone_id, &phone_id,
423	sizeof(phone_id));	427	sizeof(phone_id));
424	if (rc != 0) {	428	if (rc != 0) {
425	/* Ooops */	429	/* Ooops */
426	ipc_phone_hangup(&TASK->phones[phone_id]);	430	ipc_phone_hangup(&TASK->phones[phone_id]);
427	task_kill(t->taskid);	431	task_kill(t->taskid);
428	return rc;	432	return rc;
429	}	433	}
430		434
431	task_ready(t);	435	task_ready(t);
432		436
433	return EOK;	437	return EOK;
434	}	438	}
435		439
-		440	unative_t sys_task_spawn(void *image, size_t size)
-		441	{
-		442	void *kimage = malloc(size, 0);
-		443	if (kimage == NULL)
-		444	return ENOMEM;
-		445
-		446	int rc = copy_from_uspace(kimage, image, size);
-		447	if (rc != EOK)
-		448	return rc;
-		449
-		450	uspace_arg_t kernel_uarg = (uspace_arg_t ) malloc(sizeof(uspace_arg_t), 0);
-		451	if (kernel_uarg == NULL) {
-		452	free(kimage);
-		453	return ENOMEM;
-		454	}
-		455
-		456	kernel_uarg->uspace_entry =
-		457	(void ) ((elf_header_t ) kimage)->e_entry;
-		458	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
-		459	kernel_uarg->uspace_thread_function = NULL;
-		460	kernel_uarg->uspace_thread_arg = NULL;
-		461	kernel_uarg->uspace_uarg = NULL;
-		462
-		463	as_t *as = as_create(0);
-		464	if (as == NULL) {
-		465	free(kernel_uarg);
-		466	free(kimage);
-		467	return ENOMEM;
-		468	}
-		469
-		470	unsigned int erc = elf_load((elf_header_t *) kimage, as);
-		471	if (erc != EE_OK) {
-		472	as_destroy(as);
-		473	free(kernel_uarg);
-		474	free(kimage);
-		475	return ENOENT;
-		476	}
-		477
-		478	as_area_t *area = as_area_create(as,
-		479	AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,
-		480	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
-		481	AS_AREA_ATTR_NONE, &anon_backend, NULL);
-		482	if (area == NULL) {
-		483	as_destroy(as);
-		484	free(kernel_uarg);
-		485	free(kimage);
-		486	return ENOMEM;
-		487	}
-		488
-		489	task_t *task = task_create(as, "app");
-		490	if (task == NULL) {
-		491	as_destroy(as);
-		492	free(kernel_uarg);
-		493	free(kimage);
-		494	return ENOENT;
-		495	}
-		496
-		497	// FIXME: control the capabilities
-		498	cap_set(task, cap_get(TASK));
-		499
-		500	thread_t *thread = thread_create(uinit, kernel_uarg, task,

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(root)/branches/dynload/kernel/generic/src/proc/task.c – Rev 3004 → 3149