WebSVN – HelenOS – Diff – /trunk/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 <synch/spinlock.h>
#include <synch/waitq.h>
#include <arch.h>
#include <panic.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <ipc/ipc.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>
#include <console/klog.h>
 
#ifndef LOADED_PROG_STACK_PAGES_NO
#define LOADED_PROG_STACK_PAGES_NO 1
#endif
 
/** Spinlock protecting the tasks_btree B+tree. */
SPINLOCK_INITIALIZE(tasks_lock);
 
/** B+tree of active tasks.
 *
 * The task is guaranteed to exist after it was found in the tasks_btree 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
 *
 */
btree_t tasks_btree;
 
static task_id_t task_counter = 0;
 
static void ktaskclnp(void *arg);
static void ktaskgc(void *arg);
 
/** Initialize tasks
 *
 * Initialize kernel tasks support.
 *
 */
void task_init(void)
{
    TASK = NULL;
    btree_create(&tasks_btree);
}
 
 
/** 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;
    ta->main_thread = NULL;
    ta->refcount = 0;
    ta->context = CONTEXT;
 
    ta->capabilities = 0;
    ta->accept_new_threads = true;
    ta->cycles = 0;
   
    ipc_answerbox_init(&ta->answerbox);
    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.
     * TODO: Reconsider the locking scheme.
     */
    mutex_lock(&as->lock);
    as->refcount++;
    mutex_unlock(&as->lock);
 
    spinlock_lock(&tasks_lock);
 
    ta->taskid = ++task_counter;
    btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);
 
    spinlock_unlock(&tasks_lock);
    interrupts_restore(ipl);
 
    return ta;
}
 
/** Destroy task.
 *
 * @param t Task to be destroyed.
 */
void task_destroy(task_t *t)
{
    task_destroy_arch(t);
    btree_destroy(&t->futexes);
 
    mutex_lock_active(&t->as->lock);
    if (--t->as->refcount == 0) {
        mutex_unlock(&t->as->lock);
        as_destroy(t->as);
        /*
         * t->as is destroyed.
         */
    } else
        mutex_unlock(&t->as->lock);
   
    free(t);
    TASK = NULL;
}
 
/** Create new task with 1 thread and run it
 *
 * @param program_addr Address of program executable image.
 * @param name Program name.
 *
 * @return Task of the running program or NULL on error.
 */
task_t * task_run_program(void *program_addr, char *name)
{
    as_t *as;
    as_area_t *a;
    int rc;
    thread_t *t1, *t2;
    task_t *task;
    uspace_arg_t *kernel_uarg;
 
    as = as_create(0);
    ASSERT(as);
 
    rc = elf_load((elf_header_t *) program_addr, as);
    if (rc != EE_OK) {
        as_destroy(as);
        return NULL;
    }
   
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
    kernel_uarg->uspace_entry =
        (void *) ((elf_header_t *) program_addr)->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;
   
    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.
     */
    t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
        "uinit", false);
    ASSERT(t1);
   
    /*
     * Create killer thread for the new task.
     */
    t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc", true);
    ASSERT(t2);
    thread_ready(t2);
 
    thread_ready(t1);
 
    return task;
}
 
/** 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));
}
 
/** 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)
{
    btree_node_t *leaf;
   
    return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);
}
 
/** 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.
 *
 * @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;
    thread_t *t;
    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_lock(&ta->lock);
    ta->refcount++;
    spinlock_unlock(&ta->lock);
 
    btree_remove(&tasks_btree, ta->taskid, NULL);
    spinlock_unlock(&tasks_lock);
   
    t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp", true);
   
    spinlock_lock(&ta->lock);
    ta->accept_new_threads = false;
    ta->refcount--;
 
    /*
     * Interrupt all threads except ktaskclnp.
     */
    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);
        if (thr == t)
            continue;
           
        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);
   
    if (t)
        thread_ready(t);
 
    return 0;
}
 
/** Print task list */
void task_print_list(void)
{
    link_t *cur;
    ipl_t ipl;
   
    /* Messing with thread structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&tasks_lock);
   
    printf("taskid name       ctx address    as         cycles     threads "
        "calls  callee\n");
    printf("------ ---------- --- ---------- ---------- ---------- ------- "        "------ ------>\n");
 
    for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head;
        cur = cur->next) {
        btree_node_t *node;
        unsigned int i;
       
        node = list_get_instance(cur, btree_node_t, leaf_link);
        for (i = 0; i < node->keys; i++) {
            task_t *t;
            int j;
 
            t = (task_t *) node->value[i];
       
            spinlock_lock(&t->lock);
           
            uint64_t cycles;
            char suffix;
            order(task_get_accounting(t), &cycles, &suffix);
           
            printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd "
                "%6zd", t->taskid, t->name, t->context, t, t->as,
                cycles, suffix, t->refcount,
                atomic_get(&t->active_calls));
            for (j = 0; j < IPC_MAX_PHONES; j++) {
                if (t->phones[j].callee)
                    printf(" %zd:%#zx", j,
                        t->phones[j].callee);
            }
            printf("\n");
           
            spinlock_unlock(&t->lock);
        }
    }
 
    spinlock_unlock(&tasks_lock);
    interrupts_restore(ipl);
}
 
/** Kernel thread used to cleanup the task after it is killed. */
void ktaskclnp(void *arg)
{
    ipl_t ipl;
    thread_t *t = NULL, *main_thread;
    link_t *cur;
    bool again;
 
    thread_detach(THREAD);
 
loop:
    ipl = interrupts_disable();
    spinlock_lock(&TASK->lock);
   
    main_thread = TASK->main_thread;
   
    /*
     * Find a thread to join.
     */
    again = false;
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
        t = list_get_instance(cur, thread_t, th_link);
 
        spinlock_lock(&t->lock);
        if (t == THREAD) {
            spinlock_unlock(&t->lock);
            continue;
        } else if (t == main_thread) {
            spinlock_unlock(&t->lock);
            continue;
        } else if (t->join_type != None) {
            spinlock_unlock(&t->lock);
            again = true;
            continue;
        } else {
            t->join_type = TaskClnp;
            spinlock_unlock(&t->lock);
            again = false;
            break;
        }
    }
   
    spinlock_unlock(&TASK->lock);
    interrupts_restore(ipl);
   
    if (again) {
        /*
         * Other cleanup (e.g. ktaskgc) is in progress.
         */
        scheduler();
        goto loop;
    }
   
    if (t != THREAD) {
        ASSERT(t != main_thread);   /* uninit is joined and detached
                         * in ktaskgc */
        thread_join(t);
        thread_detach(t);
        goto loop;          /* go for another thread */
    }
   
    /*
     * Now there are no other threads in this task
     * and no new threads can be created.
     */
 
    ipc_cleanup();
    futex_cleanup();
    klog_printf("Cleanup of task %lld completed.", TASK->taskid);
}
 
/** Kernel thread used to kill the userspace task when its main thread exits.
 *
 * This thread waits until the main userspace thread (i.e. uninit) exits.
 * When this happens, the task is killed. In the meantime, exited threads
 * are garbage collected.
 *
 * @param arg Pointer to the thread structure of the task's main thread.
 */
void ktaskgc(void *arg)
{
    thread_t *t = (thread_t *) arg;
loop:  
    /*
     * Userspace threads cannot detach themselves,
     * therefore the thread pointer is guaranteed to be valid.
     */
    if (thread_join_timeout(t, 1000000, SYNCH_FLAGS_NONE) ==
        ESYNCH_TIMEOUT) {   /* sleep uninterruptibly here! */
        ipl_t ipl;
        link_t *cur;
        thread_t *thr = NULL;
   
        /*
         * The join timed out. Try to do some garbage collection of
         * Undead threads.
         */
more_gc:       
        ipl = interrupts_disable();
        spinlock_lock(&TASK->lock);
       
        for (cur = TASK->th_head.next; cur != &TASK->th_head;
            cur = cur->next) {
            thr = list_get_instance(cur, thread_t, th_link);
            spinlock_lock(&thr->lock);
            if (thr != t && thr->state == Undead &&
                thr->join_type == None) {
                thr->join_type = TaskGC;
                spinlock_unlock(&thr->lock);
                break;
            }
            spinlock_unlock(&thr->lock);
            thr = NULL;
        }
        spinlock_unlock(&TASK->lock);
        interrupts_restore(ipl);
       
        if (thr) {
            thread_join(thr);
            thread_detach(thr);
            scheduler();
            goto more_gc;
        }
           
        goto loop;
    }
    thread_detach(t);
    task_kill(TASK->taskid);
}
 
/** @}
 */
 

Rev 2109	Rev 2118
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 <synch/spinlock.h>	44	#include <synch/spinlock.h>
45	#include <synch/waitq.h>	45	#include <synch/waitq.h>
46	#include <arch.h>	46	#include <arch.h>
47	#include <panic.h>	47	#include <panic.h>
48	#include <adt/btree.h>	48	#include <adt/btree.h>
49	#include <adt/list.h>	49	#include <adt/list.h>
50	#include <ipc/ipc.h>	50	#include <ipc/ipc.h>
51	#include <security/cap.h>	51	#include <security/cap.h>
52	#include <memstr.h>	52	#include <memstr.h>
53	#include <print.h>	53	#include <print.h>
54	#include <lib/elf.h>	54	#include <lib/elf.h>
55	#include <errno.h>	55	#include <errno.h>
56	#include <func.h>	56	#include <func.h>
57	#include <syscall/copy.h>	57	#include <syscall/copy.h>
58	#include <console/klog.h>	58	#include <console/klog.h>
59		59
60	#ifndef LOADED_PROG_STACK_PAGES_NO	60	#ifndef LOADED_PROG_STACK_PAGES_NO
61	#define LOADED_PROG_STACK_PAGES_NO 1	61	#define LOADED_PROG_STACK_PAGES_NO 1
62	#endif	62	#endif
63		63
64	/** Spinlock protecting the tasks_btree B+tree. */	64	/** Spinlock protecting the tasks_btree B+tree. */
65	SPINLOCK_INITIALIZE(tasks_lock);	65	SPINLOCK_INITIALIZE(tasks_lock);
66		66
67	/** B+tree of active tasks.	67	/** B+tree of active tasks.
68	*	68	*
69	* The task is guaranteed to exist after it was found in the tasks_btree as	69	* The task is guaranteed to exist after it was found in the tasks_btree as
70	* long as:	70	* long as:
71	* @li the tasks_lock is held,	71	* @li the tasks_lock is held,
72	* @li the task's lock is held when task's lock is acquired before releasing	72	* @li the task's lock is held when task's lock is acquired before releasing
73	* tasks_lock or	73	* tasks_lock or
74	* @li the task's refcount is greater than 0	74	* @li the task's refcount is greater than 0
75	*	75	*
76	*/	76	*/
77	btree_t tasks_btree;	77	btree_t tasks_btree;
78		78
79	static task_id_t task_counter = 0;	79	static task_id_t task_counter = 0;
80		80
81	static void ktaskclnp(void *arg);	81	static void ktaskclnp(void *arg);
82	static void ktaskgc(void *arg);	82	static void ktaskgc(void *arg);
83		83
84	/** Initialize tasks	84	/** Initialize tasks
85	*	85	*
86	* Initialize kernel tasks support.	86	* Initialize kernel tasks support.
87	*	87	*
88	*/	88	*/
89	void task_init(void)	89	void task_init(void)
90	{	90	{
91	TASK = NULL;	91	TASK = NULL;
92	btree_create(&tasks_btree);	92	btree_create(&tasks_btree);
93	}	93	}
94		94
95		95
96	/** Create new task	96	/** Create new task
97	*	97	*
98	* Create new task with no threads.	98	* Create new task with no threads.
99	*	99	*
100	* @param as Task's address space.	100	* @param as Task's address space.
101	* @param name Symbolic name.	101	* @param name Symbolic name.
102	*	102	*
103	* @return New task's structure	103	* @return New task's structure
104	*	104	*
105	*/	105	*/
106	task_t task_create(as_t as, char *name)	106	task_t task_create(as_t as, char *name)
107	{	107	{
108	ipl_t ipl;	108	ipl_t ipl;
109	task_t *ta;	109	task_t *ta;
110	int i;	110	int i;
111		111
112	ta = (task_t *) malloc(sizeof(task_t), 0);	112	ta = (task_t *) malloc(sizeof(task_t), 0);
113		113
114	task_create_arch(ta);	114	task_create_arch(ta);
115		115
116	spinlock_initialize(&ta->lock, "task_ta_lock");	116	spinlock_initialize(&ta->lock, "task_ta_lock");
117	list_initialize(&ta->th_head);	117	list_initialize(&ta->th_head);
118	ta->as = as;	118	ta->as = as;
119	ta->name = name;	119	ta->name = name;
120	ta->main_thread = NULL;	120	ta->main_thread = NULL;
121	ta->refcount = 0;	121	ta->refcount = 0;
122	ta->context = CONTEXT;	122	ta->context = CONTEXT;
123		123
124	ta->capabilities = 0;	124	ta->capabilities = 0;
125	ta->accept_new_threads = true;	125	ta->accept_new_threads = true;
126	ta->cycles = 0;	126	ta->cycles = 0;
127		127
128	ipc_answerbox_init(&ta->answerbox);	128	ipc_answerbox_init(&ta->answerbox);
129	for (i = 0; i < IPC_MAX_PHONES; i++)	129	for (i = 0; i < IPC_MAX_PHONES; i++)
130	ipc_phone_init(&ta->phones[i]);	130	ipc_phone_init(&ta->phones[i]);
131	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,	131	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,
132	ta->context)))	132	ta->context)))
133	ipc_phone_connect(&ta->phones[0], ipc_phone_0);	133	ipc_phone_connect(&ta->phones[0], ipc_phone_0);
134	atomic_set(&ta->active_calls, 0);	134	atomic_set(&ta->active_calls, 0);
135		135
136	mutex_initialize(&ta->futexes_lock);	136	mutex_initialize(&ta->futexes_lock);
137	btree_create(&ta->futexes);	137	btree_create(&ta->futexes);
138		138
139	ipl = interrupts_disable();	139	ipl = interrupts_disable();
140		140
141	/*	141	/*
142	* Increment address space reference count.	142	* Increment address space reference count.
143	* TODO: Reconsider the locking scheme.	143	* TODO: Reconsider the locking scheme.
144	*/	144	*/
145	mutex_lock(&as->lock);	145	mutex_lock(&as->lock);
146	as->refcount++;	146	as->refcount++;
147	mutex_unlock(&as->lock);	147	mutex_unlock(&as->lock);
148		148
149	spinlock_lock(&tasks_lock);	149	spinlock_lock(&tasks_lock);
150		150
151	ta->taskid = ++task_counter;	151	ta->taskid = ++task_counter;
152	btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);	152	btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);
153		153
154	spinlock_unlock(&tasks_lock);	154	spinlock_unlock(&tasks_lock);
155	interrupts_restore(ipl);	155	interrupts_restore(ipl);
156		156
157	return ta;	157	return ta;
158	}	158	}
159		159
160	/** Destroy task.	160	/** Destroy task.
161	*	161	*
162	* @param t Task to be destroyed.	162	* @param t Task to be destroyed.
163	*/	163	*/
164	void task_destroy(task_t *t)	164	void task_destroy(task_t *t)
165	{	165	{
166	task_destroy_arch(t);	166	task_destroy_arch(t);
167	btree_destroy(&t->futexes);	167	btree_destroy(&t->futexes);
168		168
169	mutex_lock_active(&t->as->lock);	169	mutex_lock_active(&t->as->lock);
170	if (--t->as->refcount == 0) {	170	if (--t->as->refcount == 0) {
171	mutex_unlock(&t->as->lock);	171	mutex_unlock(&t->as->lock);
172	as_destroy(t->as);	172	as_destroy(t->as);
173	/*	173	/*
174	* t->as is destroyed.	174	* t->as is destroyed.
175	*/	175	*/
176	} else	176	} else
177	mutex_unlock(&t->as->lock);	177	mutex_unlock(&t->as->lock);
178		178
179	free(t);	179	free(t);
180	TASK = NULL;	180	TASK = NULL;
181	}	181	}
182		182
183	/** Create new task with 1 thread and run it	183	/** Create new task with 1 thread and run it
184	*	184	*
185	* @param program_addr Address of program executable image.	185	* @param program_addr Address of program executable image.
186	* @param name Program name.	186	* @param name Program name.
187	*	187	*
188	* @return Task of the running program or NULL on error.	188	* @return Task of the running program or NULL on error.
189	*/	189	*/
190	task_t * task_run_program(void program_addr, char name)	190	task_t * task_run_program(void program_addr, char name)
191	{	191	{
192	as_t *as;	192	as_t *as;
193	as_area_t *a;	193	as_area_t *a;
194	int rc;	194	int rc;
195	thread_t t1, t2;	195	thread_t t1, t2;
196	task_t *task;	196	task_t *task;
197	uspace_arg_t *kernel_uarg;	197	uspace_arg_t *kernel_uarg;
198		198
199	as = as_create(0);	199	as = as_create(0);
200	ASSERT(as);	200	ASSERT(as);
201		201
202	rc = elf_load((elf_header_t *) program_addr, as);	202	rc = elf_load((elf_header_t *) program_addr, as);
203	if (rc != EE_OK) {	203	if (rc != EE_OK) {
204	as_destroy(as);	204	as_destroy(as);
205	return NULL;	205	return NULL;
206	}	206	}
207		207
208	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	208	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
209	kernel_uarg->uspace_entry =	209	kernel_uarg->uspace_entry =
210	(void ) ((elf_header_t ) program_addr)->e_entry;	210	(void ) ((elf_header_t ) program_addr)->e_entry;
211	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;	211	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
212	kernel_uarg->uspace_thread_function = NULL;	212	kernel_uarg->uspace_thread_function = NULL;
213	kernel_uarg->uspace_thread_arg = NULL;	213	kernel_uarg->uspace_thread_arg = NULL;
214	kernel_uarg->uspace_uarg = NULL;	214	kernel_uarg->uspace_uarg = NULL;
215		215
216	task = task_create(as, name);	216	task = task_create(as, name);
217	ASSERT(task);	217	ASSERT(task);
218		218
219	/*	219	/*
220	* Create the data as_area.	220	* Create the data as_area.
221	*/	221	*/
222	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,	222	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,
223	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,	223	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
224	AS_AREA_ATTR_NONE, &anon_backend, NULL);	224	AS_AREA_ATTR_NONE, &anon_backend, NULL);
225		225
226	/*	226	/*
227	* Create the main thread.	227	* Create the main thread.
228	*/	228	*/
229	t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,	229	t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
230	"uinit", false);	230	"uinit", false);
231	ASSERT(t1);	231	ASSERT(t1);
232		232
233	/*	233	/*
234	* Create killer thread for the new task.	234	* Create killer thread for the new task.
235	*/	235	*/
236	t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc", true);	236	t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc", true);
237	ASSERT(t2);	237	ASSERT(t2);
238	thread_ready(t2);	238	thread_ready(t2);
239		239
240	thread_ready(t1);	240	thread_ready(t1);
241		241
242	return task;	242	return task;
243	}	243	}
244		244
245	/** Syscall for reading task ID from userspace.	245	/** Syscall for reading task ID from userspace.
246	*	246	*
247	* @param uspace_task_id Userspace address of 8-byte buffer where to store	247	* @param uspace_task_id Userspace address of 8-byte buffer where to store
248	* current task ID.	248	* current task ID.
249	*	249	*
250	* @return 0 on success or an error code from @ref errno.h.	250	* @return 0 on success or an error code from @ref errno.h.
251	*/	251	*/
252	unative_t sys_task_get_id(task_id_t *uspace_task_id)	252	unative_t sys_task_get_id(task_id_t *uspace_task_id)
253	{	253	{
254	/*	254	/*
255	* No need to acquire lock on TASK because taskid	255	* No need to acquire lock on TASK because taskid
256	* remains constant for the lifespan of the task.	256	* remains constant for the lifespan of the task.
257	*/	257	*/
258	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,	258	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
259	sizeof(TASK->taskid));	259	sizeof(TASK->taskid));
260	}	260	}
261		261
262	/** Find task structure corresponding to task ID.	262	/** Find task structure corresponding to task ID.
263	*	263	*
264	* The tasks_lock must be already held by the caller of this function	264	* The tasks_lock must be already held by the caller of this function
265	* and interrupts must be disabled.	265	* and interrupts must be disabled.
266	*	266	*
267	* @param id Task ID.	267	* @param id Task ID.
268	*	268	*
269	* @return Task structure address or NULL if there is no such task ID.	269	* @return Task structure address or NULL if there is no such task ID.
270	*/	270	*/
271	task_t *task_find_by_id(task_id_t id)	271	task_t *task_find_by_id(task_id_t id)
272	{	272	{
273	btree_node_t *leaf;	273	btree_node_t *leaf;
274		274
275	return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);	275	return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);
276	}	276	}
277		277
278	/** Get accounting data of given task.	278	/** Get accounting data of given task.
279	*	279	*
280	* Note that task lock of 't' must be already held and	280	* Note that task lock of 't' must be already held and
281	* interrupts must be already disabled.	281	* interrupts must be already disabled.
282	*	282	*
283	* @param t Pointer to thread.	283	* @param t Pointer to thread.
284	*	284	*
285	*/	285	*/
286	uint64_t task_get_accounting(task_t *t)	286	uint64_t task_get_accounting(task_t *t)
287	{	287	{
288	/* Accumulated value of task */	288	/* Accumulated value of task */
289	uint64_t ret = t->cycles;	289	uint64_t ret = t->cycles;
290		290
291	/* Current values of threads */	291	/* Current values of threads */
292	link_t *cur;	292	link_t *cur;
293	for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {	293	for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {
294	thread_t *thr = list_get_instance(cur, thread_t, th_link);	294	thread_t *thr = list_get_instance(cur, thread_t, th_link);
295		295
296	spinlock_lock(&thr->lock);	296	spinlock_lock(&thr->lock);
297	/* Process only counted threads */	297	/* Process only counted threads */
298	if (!thr->uncounted) {	298	if (!thr->uncounted) {
299	if (thr == THREAD) {	299	if (thr == THREAD) {
300	/* Update accounting of current thread */	300	/* Update accounting of current thread */
301	thread_update_accounting();	301	thread_update_accounting();
302	}	302	}
303	ret += thr->cycles;	303	ret += thr->cycles;
304	}	304	}
305	spinlock_unlock(&thr->lock);	305	spinlock_unlock(&thr->lock);
306	}	306	}
307		307
308	return ret;	308	return ret;
309	}	309	}
310		310
311	/** Kill task.	311	/** Kill task.
312	*	312	*
313	* @param id ID of the task to be killed.	313	* @param id ID of the task to be killed.
314	*	314	*
315	* @return 0 on success or an error code from errno.h	315	* @return 0 on success or an error code from errno.h
316	*/	316	*/
317	int task_kill(task_id_t id)	317	int task_kill(task_id_t id)
318	{	318	{
319	ipl_t ipl;	319	ipl_t ipl;
320	task_t *ta;	320	task_t *ta;
321	thread_t *t;	321	thread_t *t;
322	link_t *cur;	322	link_t *cur;
323		323
324	if (id == 1)	324	if (id == 1)
325	return EPERM;	325	return EPERM;
326		326
327	ipl = interrupts_disable();	327	ipl = interrupts_disable();
328	spinlock_lock(&tasks_lock);	328	spinlock_lock(&tasks_lock);
329		329
330	if (!(ta = task_find_by_id(id))) {	330	if (!(ta = task_find_by_id(id))) {
331	spinlock_unlock(&tasks_lock);	331	spinlock_unlock(&tasks_lock);
332	interrupts_restore(ipl);	332	interrupts_restore(ipl);
333	return ENOENT;	333	return ENOENT;
334	}	334	}
335		335
336	spinlock_lock(&ta->lock);	336	spinlock_lock(&ta->lock);
337	ta->refcount++;	337	ta->refcount++;
338	spinlock_unlock(&ta->lock);	338	spinlock_unlock(&ta->lock);
339		339
340	btree_remove(&tasks_btree, ta->taskid, NULL);	340	btree_remove(&tasks_btree, ta->taskid, NULL);
341	spinlock_unlock(&tasks_lock);	341	spinlock_unlock(&tasks_lock);
342		342
343	t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp", true);	343	t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp", true);
344		344
345	spinlock_lock(&ta->lock);	345	spinlock_lock(&ta->lock);
346	ta->accept_new_threads = false;	346	ta->accept_new_threads = false;
347	ta->refcount--;	347	ta->refcount--;
348		348
349	/*	349	/*
350	* Interrupt all threads except ktaskclnp.	350	* Interrupt all threads except ktaskclnp.
351	*/	351	*/
352	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {	352	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
353	thread_t *thr;	353	thread_t *thr;
354	bool sleeping = false;	354	bool sleeping = false;
355		355
356	thr = list_get_instance(cur, thread_t, th_link);	356	thr = list_get_instance(cur, thread_t, th_link);
357	if (thr == t)	357	if (thr == t)
358	continue;	358	continue;
359		359
360	spinlock_lock(&thr->lock);	360	spinlock_lock(&thr->lock);
361	thr->interrupted = true;	361	thr->interrupted = true;
362	if (thr->state == Sleeping)	362	if (thr->state == Sleeping)
363	sleeping = true;	363	sleeping = true;
364	spinlock_unlock(&thr->lock);	364	spinlock_unlock(&thr->lock);
365		365
366	if (sleeping)	366	if (sleeping)
367	waitq_interrupt_sleep(thr);	367	waitq_interrupt_sleep(thr);
368	}	368	}
369		369
370	spinlock_unlock(&ta->lock);	370	spinlock_unlock(&ta->lock);
371	interrupts_restore(ipl);	371	interrupts_restore(ipl);
372		372
373	if (t)	373	if (t)
374	thread_ready(t);	374	thread_ready(t);
375		375
376	return 0;	376	return 0;
377	}	377	}
378		378
379	/** Print task list */	379	/** Print task list */
380	void task_print_list(void)	380	void task_print_list(void)
381	{	381	{
382	link_t *cur;	382	link_t *cur;
383	ipl_t ipl;	383	ipl_t ipl;
384		384
385	/* Messing with thread structures, avoid deadlock */	385	/* Messing with thread structures, avoid deadlock */
386	ipl = interrupts_disable();	386	ipl = interrupts_disable();
387	spinlock_lock(&tasks_lock);	387	spinlock_lock(&tasks_lock);
388		388
389	printf("taskid name ctx address as cycles threads "	389	printf("taskid name ctx address as cycles threads "
390	"calls callee\n");	390	"calls callee\n");
391	printf("------ ---------- --- ---------- ---------- ---------- ------- " "------ ------>\n");	391	printf("------ ---------- --- ---------- ---------- ---------- ------- " "------ ------>\n");
392		392
393	for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head;	393	for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head;
394	cur = cur->next) {	394	cur = cur->next) {
395	btree_node_t *node;	395	btree_node_t *node;
396	int i;	396	unsigned int i;
397		397
398	node = list_get_instance(cur, btree_node_t, leaf_link);	398	node = list_get_instance(cur, btree_node_t, leaf_link);
399	for (i = 0; i < node->keys; i++) {	399	for (i = 0; i < node->keys; i++) {
400	task_t *t;	400	task_t *t;
401	int j;	401	int j;
402		402
403	t = (task_t *) node->value[i];	403	t = (task_t *) node->value[i];
404		404
405	spinlock_lock(&t->lock);	405	spinlock_lock(&t->lock);
406		406
407	uint64_t cycles;	407	uint64_t cycles;
408	char suffix;	408	char suffix;
409	order(task_get_accounting(t), &cycles, &suffix);	409	order(task_get_accounting(t), &cycles, &suffix);
410		410
411	printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd "	411	printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd "
412	"%6zd", t->taskid, t->name, t->context, t, t->as,	412	"%6zd", t->taskid, t->name, t->context, t, t->as,
413	cycles, suffix, t->refcount,	413	cycles, suffix, t->refcount,
414	atomic_get(&t->active_calls));	414	atomic_get(&t->active_calls));
415	for (j = 0; j < IPC_MAX_PHONES; j++) {	415	for (j = 0; j < IPC_MAX_PHONES; j++) {
416	if (t->phones[j].callee)	416	if (t->phones[j].callee)
417	printf(" %zd:%#zx", j,	417	printf(" %zd:%#zx", j,
418	t->phones[j].callee);	418	t->phones[j].callee);
419	}	419	}
420	printf("\n");	420	printf("\n");
421		421
422	spinlock_unlock(&t->lock);	422	spinlock_unlock(&t->lock);
423	}	423	}
424	}	424	}
425		425
426	spinlock_unlock(&tasks_lock);	426	spinlock_unlock(&tasks_lock);
427	interrupts_restore(ipl);	427	interrupts_restore(ipl);
428	}	428	}
429		429
430	/** Kernel thread used to cleanup the task after it is killed. */	430	/** Kernel thread used to cleanup the task after it is killed. */
431	void ktaskclnp(void *arg)	431	void ktaskclnp(void *arg)
432	{	432	{
433	ipl_t ipl;	433	ipl_t ipl;
434	thread_t t = NULL, main_thread;	434	thread_t t = NULL, main_thread;
435	link_t *cur;	435	link_t *cur;
436	bool again;	436	bool again;
437		437
438	thread_detach(THREAD);	438	thread_detach(THREAD);
439		439
440	loop:	440	loop:
441	ipl = interrupts_disable();	441	ipl = interrupts_disable();
442	spinlock_lock(&TASK->lock);	442	spinlock_lock(&TASK->lock);
443		443
444	main_thread = TASK->main_thread;	444	main_thread = TASK->main_thread;
445		445
446	/*	446	/*
447	* Find a thread to join.	447	* Find a thread to join.
448	*/	448	*/
449	again = false;	449	again = false;
450	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {	450	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
451	t = list_get_instance(cur, thread_t, th_link);	451	t = list_get_instance(cur, thread_t, th_link);
452		452
453	spinlock_lock(&t->lock);	453	spinlock_lock(&t->lock);
454	if (t == THREAD) {	454	if (t == THREAD) {
455	spinlock_unlock(&t->lock);	455	spinlock_unlock(&t->lock);
456	continue;	456	continue;
457	} else if (t == main_thread) {	457	} else if (t == main_thread) {
458	spinlock_unlock(&t->lock);	458	spinlock_unlock(&t->lock);
459	continue;	459	continue;
460	} else if (t->join_type != None) {	460	} else if (t->join_type != None) {
461	spinlock_unlock(&t->lock);	461	spinlock_unlock(&t->lock);
462	again = true;	462	again = true;
463	continue;	463	continue;
464	} else {	464	} else {
465	t->join_type = TaskClnp;	465	t->join_type = TaskClnp;
466	spinlock_unlock(&t->lock);	466	spinlock_unlock(&t->lock);
467	again = false;	467	again = false;
468	break;	468	break;
469	}	469	}
470	}	470	}
471		471
472	spinlock_unlock(&TASK->lock);	472	spinlock_unlock(&TASK->lock);
473	interrupts_restore(ipl);	473	interrupts_restore(ipl);
474		474
475	if (again) {	475	if (again) {
476	/*	476	/*
477	* Other cleanup (e.g. ktaskgc) is in progress.	477	* Other cleanup (e.g. ktaskgc) is in progress.
478	*/	478	*/
479	scheduler();	479	scheduler();
480	goto loop;	480	goto loop;
481	}	481	}
482		482
483	if (t != THREAD) {	483	if (t != THREAD) {
484	ASSERT(t != main_thread); /* uninit is joined and detached	484	ASSERT(t != main_thread); /* uninit is joined and detached
485	* in ktaskgc */	485	* in ktaskgc */
486	thread_join(t);	486	thread_join(t);
487	thread_detach(t);	487	thread_detach(t);
488	goto loop; /* go for another thread */	488	goto loop; /* go for another thread */
489	}	489	}
490		490
491	/*	491	/*
492	* Now there are no other threads in this task	492	* Now there are no other threads in this task
493	* and no new threads can be created.	493	* and no new threads can be created.
494	*/	494	*/
495		495
496	ipc_cleanup();	496	ipc_cleanup();
497	futex_cleanup();	497	futex_cleanup();
498	klog_printf("Cleanup of task %lld completed.", TASK->taskid);	498	klog_printf("Cleanup of task %lld completed.", TASK->taskid);
499	}	499	}
500		500

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/proc/task.c – Rev 2109 → 2118