WebSVN – HelenOS – Diff – /branches/tracing/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 <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;
 
/** 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 %llu\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;
 
    /* Init debugging stuff */
 
    udebug_task_init(&ta->udebug);
 
 
 
    /* Init kbox stuff */
    ipc_answerbox_init(&ta->kernel_box, ta);
    ta->kb_thread = NULL;
    spinlock_initialize(&ta->kb_cleanup_lock, "task_kb_cleanup_lock");
    ta->kb_finished = false;
    waitq_initialize(&ta->kb_thread_shutdown_wq);
 
    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 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;
    unsigned int rc;
    thread_t *t;
    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.
     */
    t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
        "uinit", false);
    ASSERT(t);
   
    thread_ready(t);
 
    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)
{
    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);
   
    if (sizeof(void *) == 4)
        printf("%-6llu %-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));
    else
        printf("%-6llu %-10s %-3ld %#18zx %#18zx %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);
    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);
   
    if (sizeof(void *) == 4) {
        printf("taskid name       ctx address    as         "
            "cycles     threads calls  callee\n");
        printf("------ ---------- --- ---------- ---------- "
            "---------- ------- ------ ------>\n");
    } else {
        printf("taskid name       ctx address            as                 "
            "cycles     threads calls  callee\n");
        printf("------ ---------- --- ------------------ ------------------ "
            "---------- ------- ------ ------>\n");
    }
 
    avltree_walk(&tasks_tree, task_print_walker, NULL);
 
    spinlock_unlock(&tasks_lock);
    interrupts_restore(ipl);
}
 
/** @}
 */
 

Rev 2902	Rev 3014
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 <security/cap.h>	53	#include <security/cap.h>
54	#include <memstr.h>	54	#include <memstr.h>
55	#include <print.h>	55	#include <print.h>
56	#include <lib/elf.h>	56	#include <lib/elf.h>
57	#include <errno.h>	57	#include <errno.h>
58	#include <func.h>	58	#include <func.h>
59	#include <syscall/copy.h>	59	#include <syscall/copy.h>
60		60
61	#ifndef LOADED_PROG_STACK_PAGES_NO	61	#ifndef LOADED_PROG_STACK_PAGES_NO
62	#define LOADED_PROG_STACK_PAGES_NO 1	62	#define LOADED_PROG_STACK_PAGES_NO 1
63	#endif	63	#endif
64		64
65	/** Spinlock protecting the tasks_tree AVL tree. */	65	/** Spinlock protecting the tasks_tree AVL tree. */
66	SPINLOCK_INITIALIZE(tasks_lock);	66	SPINLOCK_INITIALIZE(tasks_lock);
67		67
68	/** AVL tree of active tasks.	68	/** AVL tree of active tasks.
69	*	69	*
70	* The task is guaranteed to exist after it was found in the tasks_tree as	70	* The task is guaranteed to exist after it was found in the tasks_tree as
71	* long as:	71	* long as:
72	* @li the tasks_lock is held,	72	* @li the tasks_lock is held,
73	* @li the task's lock is held when task's lock is acquired before releasing	73	* @li the task's lock is held when task's lock is acquired before releasing
74	* tasks_lock or	74	* tasks_lock or
75	* @li the task's refcount is greater than 0	75	* @li the task's refcount is greater than 0
76	*	76	*
77	*/	77	*/
78	avltree_t tasks_tree;	78	avltree_t tasks_tree;
79		79
80	static task_id_t task_counter = 0;	80	static task_id_t task_counter = 0;
81		81
82	/** Initialize tasks	82	/** Initialize tasks
83	*	83	*
84	* Initialize kernel tasks support.	84	* Initialize kernel tasks support.
85	*	85	*
86	*/	86	*/
87	void task_init(void)	87	void task_init(void)
88	{	88	{
89	TASK = NULL;	89	TASK = NULL;
90	avltree_create(&tasks_tree);	90	avltree_create(&tasks_tree);
91	}	91	}
92		92
93	/*	93	/*
94	* The idea behind this walker is to remember a single task different from TASK.	94	* The idea behind this walker is to remember a single task different from TASK.
95	*/	95	*/
96	static bool task_done_walker(avltree_node_t node, void arg)	96	static bool task_done_walker(avltree_node_t node, void arg)
97	{	97	{
98	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);	98	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
99	task_t tp = (task_t ) arg;	99	task_t tp = (task_t ) arg;
100		100
101	if (t != TASK) {	101	if (t != TASK) {
102	*tp = t;	102	*tp = t;
103	return false; /* stop walking */	103	return false; /* stop walking */
104	}	104	}
105		105
106	return true; /* continue the walk */	106	return true; /* continue the walk */
107	}	107	}
108		108
109	/** Kill all tasks except the current task.	109	/** Kill all tasks except the current task.
110	*	110	*
111	*/	111	*/
112	void task_done(void)	112	void task_done(void)
113	{	113	{
114	task_t *t;	114	task_t *t;
115	do { /* Repeat until there are any tasks except TASK */	115	do { /* Repeat until there are any tasks except TASK */
116		116
117	/* Messing with task structures, avoid deadlock */	117	/* Messing with task structures, avoid deadlock */
118	ipl_t ipl = interrupts_disable();	118	ipl_t ipl = interrupts_disable();
119	spinlock_lock(&tasks_lock);	119	spinlock_lock(&tasks_lock);
120		120
121	t = NULL;	121	t = NULL;
122	avltree_walk(&tasks_tree, task_done_walker, &t);	122	avltree_walk(&tasks_tree, task_done_walker, &t);
123		123
124	if (t != NULL) {	124	if (t != NULL) {
125	task_id_t id = t->taskid;	125	task_id_t id = t->taskid;
126		126
127	spinlock_unlock(&tasks_lock);	127	spinlock_unlock(&tasks_lock);
128	interrupts_restore(ipl);	128	interrupts_restore(ipl);
129		129
130	#ifdef CONFIG_DEBUG	130	#ifdef CONFIG_DEBUG
131	printf("Killing task %llu\n", id);	131	printf("Killing task %llu\n", id);
132	#endif	132	#endif
133	task_kill(id);	133	task_kill(id);
134	thread_usleep(10000);	134	thread_usleep(10000);
135	} else {	135	} else {
136	spinlock_unlock(&tasks_lock);	136	spinlock_unlock(&tasks_lock);
137	interrupts_restore(ipl);	137	interrupts_restore(ipl);
138	}	138	}
139		139
140	} while (t != NULL);	140	} while (t != NULL);
141	}	141	}
142		142
143	/** Create new task	143	/** Create new task
144	*	144	*
145	* Create new task with no threads.	145	* Create new task with no threads.
146	*	146	*
147	* @param as Task's address space.	147	* @param as Task's address space.
148	* @param name Symbolic name.	148	* @param name Symbolic name.
149	*	149	*
150	* @return New task's structure	150	* @return New task's structure
151	*	151	*
152	*/	152	*/
153	task_t task_create(as_t as, char *name)	153	task_t task_create(as_t as, char *name)
154	{	154	{
155	ipl_t ipl;	155	ipl_t ipl;
156	task_t *ta;	156	task_t *ta;
157	int i;	157	int i;
158		158
159	ta = (task_t *) malloc(sizeof(task_t), 0);	159	ta = (task_t *) malloc(sizeof(task_t), 0);
160		160
161	task_create_arch(ta);	161	task_create_arch(ta);
162		162
163	spinlock_initialize(&ta->lock, "task_ta_lock");	163	spinlock_initialize(&ta->lock, "task_ta_lock");
164	list_initialize(&ta->th_head);	164	list_initialize(&ta->th_head);
165	ta->as = as;	165	ta->as = as;
166	ta->name = name;	166	ta->name = name;
167	atomic_set(&ta->refcount, 0);	167	atomic_set(&ta->refcount, 0);
168	atomic_set(&ta->lifecount, 0);	168	atomic_set(&ta->lifecount, 0);
169	ta->context = CONTEXT;	169	ta->context = CONTEXT;
170		170
171	ta->capabilities = 0;	171	ta->capabilities = 0;
172	ta->cycles = 0;	172	ta->cycles = 0;
173		173
174	/* Init debugging stuff */	174	/* Init debugging stuff */
175	ta->dt_state = UDEBUG_TS_INACTIVE;	-
176	ta->debug_begin_call = NULL;	175	udebug_task_init(&ta->udebug);
177	ta->not_stoppable_count = 0;	-
178	ta->debug_evmask = 0;	-
179		176
180	/* Init kbox stuff */	177	/* Init kbox stuff */
181	ipc_answerbox_init(&ta->kernel_box, ta);	178	ipc_answerbox_init(&ta->kernel_box, ta);
182	ta->kb_thread = NULL;	179	ta->kb_thread = NULL;
183	spinlock_initialize(&ta->kb_cleanup_lock, "task_kb_cleanup_lock");	180	spinlock_initialize(&ta->kb_cleanup_lock, "task_kb_cleanup_lock");
184	ta->kb_finished = false;	181	ta->kb_finished = false;
185	waitq_initialize(&ta->kb_thread_shutdown_wq);	182	waitq_initialize(&ta->kb_thread_shutdown_wq);
186		183
187	ipc_answerbox_init(&ta->answerbox, ta);	184	ipc_answerbox_init(&ta->answerbox, ta);
188	for (i = 0; i < IPC_MAX_PHONES; i++)	185	for (i = 0; i < IPC_MAX_PHONES; i++)
189	ipc_phone_init(&ta->phones[i]);	186	ipc_phone_init(&ta->phones[i]);
190	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,	187	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,
191	ta->context)))	188	ta->context)))
192	ipc_phone_connect(&ta->phones[0], ipc_phone_0);	189	ipc_phone_connect(&ta->phones[0], ipc_phone_0);
193	atomic_set(&ta->active_calls, 0);	190	atomic_set(&ta->active_calls, 0);
194		191
195	mutex_initialize(&ta->futexes_lock);	192	mutex_initialize(&ta->futexes_lock);
196	btree_create(&ta->futexes);	193	btree_create(&ta->futexes);
197		194
198	ipl = interrupts_disable();	195	ipl = interrupts_disable();
199		196
200	/*	197	/*
201	* Increment address space reference count.	198	* Increment address space reference count.
202	*/	199	*/
203	atomic_inc(&as->refcount);	200	atomic_inc(&as->refcount);
204		201
205	spinlock_lock(&tasks_lock);	202	spinlock_lock(&tasks_lock);
206	ta->taskid = ++task_counter;	203	ta->taskid = ++task_counter;
207	avltree_node_initialize(&ta->tasks_tree_node);	204	avltree_node_initialize(&ta->tasks_tree_node);
208	ta->tasks_tree_node.key = ta->taskid;	205	ta->tasks_tree_node.key = ta->taskid;
209	avltree_insert(&tasks_tree, &ta->tasks_tree_node);	206	avltree_insert(&tasks_tree, &ta->tasks_tree_node);
210	spinlock_unlock(&tasks_lock);	207	spinlock_unlock(&tasks_lock);
211	interrupts_restore(ipl);	208	interrupts_restore(ipl);
212		209
213	return ta;	210	return ta;
214	}	211	}
215		212
216	/** Destroy task.	213	/** Destroy task.
217	*	214	*
218	* @param t Task to be destroyed.	215	* @param t Task to be destroyed.
219	*/	216	*/
220	void task_destroy(task_t *t)	217	void task_destroy(task_t *t)
221	{	218	{
222	/*	219	/*
223	* Remove the task from the task B+tree.	220	* Remove the task from the task B+tree.
224	*/	221	*/
225	spinlock_lock(&tasks_lock);	222	spinlock_lock(&tasks_lock);
226	avltree_delete(&tasks_tree, &t->tasks_tree_node);	223	avltree_delete(&tasks_tree, &t->tasks_tree_node);
227	spinlock_unlock(&tasks_lock);	224	spinlock_unlock(&tasks_lock);
228		225
229	/*	226	/*
230	* Perform architecture specific task destruction.	227	* Perform architecture specific task destruction.
231	*/	228	*/
232	task_destroy_arch(t);	229	task_destroy_arch(t);
233		230
234	/*	231	/*
235	* Free up dynamically allocated state.	232	* Free up dynamically allocated state.
236	*/	233	*/
237	btree_destroy(&t->futexes);	234	btree_destroy(&t->futexes);
238		235
239	/*	236	/*
240	* Drop our reference to the address space.	237	* Drop our reference to the address space.
241	*/	238	*/
242	if (atomic_predec(&t->as->refcount) == 0)	239	if (atomic_predec(&t->as->refcount) == 0)
243	as_destroy(t->as);	240	as_destroy(t->as);
244		241
245	free(t);	242	free(t);
246	TASK = NULL;	243	TASK = NULL;
247	}	244	}
248		245
249	/** Create new task with 1 thread and run it	246	/** Create new task with 1 thread and run it
250	*	247	*
251	* @param program_addr Address of program executable image.	248	* @param program_addr Address of program executable image.
252	* @param name Program name.	249	* @param name Program name.
253	*	250	*
254	* @return Task of the running program or NULL on error.	251	* @return Task of the running program or NULL on error.
255	*/	252	*/
256	task_t task_run_program(void program_addr, char *name)	253	task_t task_run_program(void program_addr, char *name)
257	{	254	{
258	as_t *as;	255	as_t *as;
259	as_area_t *a;	256	as_area_t *a;
260	unsigned int rc;	257	unsigned int rc;
261	thread_t *t;	258	thread_t *t;
262	task_t *task;	259	task_t *task;
263	uspace_arg_t *kernel_uarg;	260	uspace_arg_t *kernel_uarg;
264		261
265	as = as_create(0);	262	as = as_create(0);
266	ASSERT(as);	263	ASSERT(as);
267		264
268	rc = elf_load((elf_header_t *) program_addr, as);	265	rc = elf_load((elf_header_t *) program_addr, as);
269	if (rc != EE_OK) {	266	if (rc != EE_OK) {
270	as_destroy(as);	267	as_destroy(as);
271	return NULL;	268	return NULL;
272	}	269	}
273		270
274	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);	271	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
275	kernel_uarg->uspace_entry =	272	kernel_uarg->uspace_entry =
276	(void ) ((elf_header_t ) program_addr)->e_entry;	273	(void ) ((elf_header_t ) program_addr)->e_entry;
277	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;	274	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
278	kernel_uarg->uspace_thread_function = NULL;	275	kernel_uarg->uspace_thread_function = NULL;
279	kernel_uarg->uspace_thread_arg = NULL;	276	kernel_uarg->uspace_thread_arg = NULL;
280	kernel_uarg->uspace_uarg = NULL;	277	kernel_uarg->uspace_uarg = NULL;
281		278
282	task = task_create(as, name);	279	task = task_create(as, name);
283	ASSERT(task);	280	ASSERT(task);
284		281
285	/*	282	/*
286	* Create the data as_area.	283	* Create the data as_area.
287	*/	284	*/
288	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,	285	a = as_area_create(as, AS_AREA_READ \| AS_AREA_WRITE \| AS_AREA_CACHEABLE,
289	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,	286	LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
290	AS_AREA_ATTR_NONE, &anon_backend, NULL);	287	AS_AREA_ATTR_NONE, &anon_backend, NULL);
291		288
292	/*	289	/*
293	* Create the main thread.	290	* Create the main thread.
294	*/	291	*/
295	t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,	292	t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
296	"uinit", false);	293	"uinit", false);
297	ASSERT(t);	294	ASSERT(t);
298		295
299	thread_ready(t);	296	thread_ready(t);
300		297
301	return task;	298	return task;
302	}	299	}
303		300
304	/** Syscall for reading task ID from userspace.	301	/** Syscall for reading task ID from userspace.
305	*	302	*
306	* @param uspace_task_id Userspace address of 8-byte buffer where to store	303	* @param uspace_task_id Userspace address of 8-byte buffer where to store
307	* current task ID.	304	* current task ID.
308	*	305	*
309	* @return 0 on success or an error code from @ref errno.h.	306	* @return 0 on success or an error code from @ref errno.h.
310	*/	307	*/
311	unative_t sys_task_get_id(task_id_t *uspace_task_id)	308	unative_t sys_task_get_id(task_id_t *uspace_task_id)
312	{	309	{
313	/*	310	/*
314	* No need to acquire lock on TASK because taskid	311	* No need to acquire lock on TASK because taskid
315	* remains constant for the lifespan of the task.	312	* remains constant for the lifespan of the task.
316	*/	313	*/
317	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,	314	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
318	sizeof(TASK->taskid));	315	sizeof(TASK->taskid));
319	}	316	}
320		317
321	/** Find task structure corresponding to task ID.	318	/** Find task structure corresponding to task ID.
322	*	319	*
323	* The tasks_lock must be already held by the caller of this function	320	* The tasks_lock must be already held by the caller of this function
324	* and interrupts must be disabled.	321	* and interrupts must be disabled.
325	*	322	*
326	* @param id Task ID.	323	* @param id Task ID.
327	*	324	*
328	* @return Task structure address or NULL if there is no such task ID.	325	* @return Task structure address or NULL if there is no such task ID.
329	*/	326	*/
330	task_t *task_find_by_id(task_id_t id)	327	task_t *task_find_by_id(task_id_t id)
331	{	328	{
332	avltree_node_t *node;	329	avltree_node_t *node;
333		330
334	node = avltree_search(&tasks_tree, (avltree_key_t) id);	331	node = avltree_search(&tasks_tree, (avltree_key_t) id);
335		332
336	if (node)	333	if (node)
337	return avltree_get_instance(node, task_t, tasks_tree_node);	334	return avltree_get_instance(node, task_t, tasks_tree_node);
338	return NULL;	335	return NULL;
339	}	336	}
340		337
341	/** Get accounting data of given task.	338	/** Get accounting data of given task.
342	*	339	*
343	* Note that task lock of 't' must be already held and	340	* Note that task lock of 't' must be already held and
344	* interrupts must be already disabled.	341	* interrupts must be already disabled.
345	*	342	*
346	* @param t Pointer to thread.	343	* @param t Pointer to thread.
347	*	344	*
348	*/	345	*/
349	uint64_t task_get_accounting(task_t *t)	346	uint64_t task_get_accounting(task_t *t)
350	{	347	{
351	/* Accumulated value of task */	348	/* Accumulated value of task */
352	uint64_t ret = t->cycles;	349	uint64_t ret = t->cycles;
353		350
354	/* Current values of threads */	351	/* Current values of threads */
355	link_t *cur;	352	link_t *cur;
356	for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {	353	for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {
357	thread_t *thr = list_get_instance(cur, thread_t, th_link);	354	thread_t *thr = list_get_instance(cur, thread_t, th_link);
358		355
359	spinlock_lock(&thr->lock);	356	spinlock_lock(&thr->lock);
360	/* Process only counted threads */	357	/* Process only counted threads */
361	if (!thr->uncounted) {	358	if (!thr->uncounted) {
362	if (thr == THREAD) {	359	if (thr == THREAD) {
363	/* Update accounting of current thread */	360	/* Update accounting of current thread */
364	thread_update_accounting();	361	thread_update_accounting();
365	}	362	}
366	ret += thr->cycles;	363	ret += thr->cycles;
367	}	364	}
368	spinlock_unlock(&thr->lock);	365	spinlock_unlock(&thr->lock);
369	}	366	}
370		367
371	return ret;	368	return ret;
372	}	369	}
373		370
374	/** Kill task.	371	/** Kill task.
375	*	372	*
376	* This function is idempotent.	373	* This function is idempotent.
377	* It signals all the task's threads to bail it out.	374	* It signals all the task's threads to bail it out.
378	*	375	*
379	* @param id ID of the task to be killed.	376	* @param id ID of the task to be killed.
380	*	377	*
381	* @return 0 on success or an error code from errno.h	378	* @return 0 on success or an error code from errno.h
382	*/	379	*/
383	int task_kill(task_id_t id)	380	int task_kill(task_id_t id)
384	{	381	{
385	ipl_t ipl;	382	ipl_t ipl;
386	task_t *ta;	383	task_t *ta;
387	link_t *cur;	384	link_t *cur;
388		385
389	if (id == 1)	386	if (id == 1)
390	return EPERM;	387	return EPERM;
391		388
392	ipl = interrupts_disable();	389	ipl = interrupts_disable();
393	spinlock_lock(&tasks_lock);	390	spinlock_lock(&tasks_lock);
394	if (!(ta = task_find_by_id(id))) {	391	if (!(ta = task_find_by_id(id))) {
395	spinlock_unlock(&tasks_lock);	392	spinlock_unlock(&tasks_lock);
396	interrupts_restore(ipl);	393	interrupts_restore(ipl);
397	return ENOENT;	394	return ENOENT;
398	}	395	}
399	spinlock_unlock(&tasks_lock);	396	spinlock_unlock(&tasks_lock);
400		397
401	/*	398	/*
402	* Interrupt all threads except ktaskclnp.	399	* Interrupt all threads except ktaskclnp.
403	*/	400	*/
404	spinlock_lock(&ta->lock);	401	spinlock_lock(&ta->lock);
405	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {	402	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
406	thread_t *thr;	403	thread_t *thr;
407	bool sleeping = false;	404	bool sleeping = false;
408		405
409	thr = list_get_instance(cur, thread_t, th_link);	406	thr = list_get_instance(cur, thread_t, th_link);
410		407
411	spinlock_lock(&thr->lock);	408	spinlock_lock(&thr->lock);
412	thr->interrupted = true;	409	thr->interrupted = true;
413	if (thr->state == Sleeping)	410	if (thr->state == Sleeping)
414	sleeping = true;	411	sleeping = true;
415	spinlock_unlock(&thr->lock);	412	spinlock_unlock(&thr->lock);
416		413
417	if (sleeping)	414	if (sleeping)
418	waitq_interrupt_sleep(thr);	415	waitq_interrupt_sleep(thr);
419	}	416	}
420	spinlock_unlock(&ta->lock);	417	spinlock_unlock(&ta->lock);
421	interrupts_restore(ipl);	418	interrupts_restore(ipl);
422		419
423	return 0;	420	return 0;
424	}	421	}
425		422
426	static bool task_print_walker(avltree_node_t node, void arg)	423	static bool task_print_walker(avltree_node_t node, void arg)
427	{	424	{
428	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);	425	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
429	int j;	426	int j;
430		427
431	spinlock_lock(&t->lock);	428	spinlock_lock(&t->lock);
432		429
433	uint64_t cycles;	430	uint64_t cycles;
434	char suffix;	431	char suffix;
435	order(task_get_accounting(t), &cycles, &suffix);	432	order(task_get_accounting(t), &cycles, &suffix);
436		433
437	if (sizeof(void *) == 4)	434	if (sizeof(void *) == 4)
438	printf("%-6llu %-10s %-3ld %#10zx %#10zx %9llu%c %7zd %6zd",	435	printf("%-6llu %-10s %-3ld %#10zx %#10zx %9llu%c %7zd %6zd",
439	t->taskid, t->name, t->context, t, t->as, cycles, suffix,	436	t->taskid, t->name, t->context, t, t->as, cycles, suffix,
440	t->refcount, atomic_get(&t->active_calls));	437	t->refcount, atomic_get(&t->active_calls));
441	else	438	else
442	printf("%-6llu %-10s %-3ld %#18zx %#18zx %9llu%c %7zd %6zd",	439	printf("%-6llu %-10s %-3ld %#18zx %#18zx %9llu%c %7zd %6zd",
443	t->taskid, t->name, t->context, t, t->as, cycles, suffix,	440	t->taskid, t->name, t->context, t, t->as, cycles, suffix,
444	t->refcount, atomic_get(&t->active_calls));	441	t->refcount, atomic_get(&t->active_calls));
445	for (j = 0; j < IPC_MAX_PHONES; j++) {	442	for (j = 0; j < IPC_MAX_PHONES; j++) {
446	if (t->phones[j].callee)	443	if (t->phones[j].callee)
447	printf(" %zd:%#zx", j, t->phones[j].callee);	444	printf(" %zd:%#zx", j, t->phones[j].callee);
448	}	445	}
449	printf("\n");	446	printf("\n");
450		447
451	spinlock_unlock(&t->lock);	448	spinlock_unlock(&t->lock);
452	return true;	449	return true;
453	}	450	}
454		451
455	/** Print task list */	452	/** Print task list */
456	void task_print_list(void)	453	void task_print_list(void)
457	{	454	{
458	ipl_t ipl;	455	ipl_t ipl;
459		456
460	/* Messing with task structures, avoid deadlock */	457	/* Messing with task structures, avoid deadlock */
461	ipl = interrupts_disable();	458	ipl = interrupts_disable();
462	spinlock_lock(&tasks_lock);	459	spinlock_lock(&tasks_lock);
463		460
464	if (sizeof(void *) == 4) {	461	if (sizeof(void *) == 4) {
465	printf("taskid name ctx address as "	462	printf("taskid name ctx address as "
466	"cycles threads calls callee\n");	463	"cycles threads calls callee\n");
467	printf("------ ---------- --- ---------- ---------- "	464	printf("------ ---------- --- ---------- ---------- "
468	"---------- ------- ------ ------>\n");	465	"---------- ------- ------ ------>\n");
469	} else {	466	} else {
470	printf("taskid name ctx address as "	467	printf("taskid name ctx address as "
471	"cycles threads calls callee\n");	468	"cycles threads calls callee\n");
472	printf("------ ---------- --- ------------------ ------------------ "	469	printf("------ ---------- --- ------------------ ------------------ "
473	"---------- ------- ------ ------>\n");	470	"---------- ------- ------ ------>\n");
474	}	471	}
475		472
476	avltree_walk(&tasks_tree, task_print_walker, NULL);	473	avltree_walk(&tasks_tree, task_print_walker, NULL);
477		474
478	spinlock_unlock(&tasks_lock);	475	spinlock_unlock(&tasks_lock);
479	interrupts_restore(ipl);	476	interrupts_restore(ipl);
480	}	477	}
481		478
482	/** @}	479	/** @}
483	*/	480	*/
484		481

Subversion Repositories HelenOS

(root)/branches/tracing/kernel/generic/src/proc/task.c @ 4718 – Rev 2902 → 3014