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955 palkovsky 1
/*
2
 * Copyright (C) 2006 Ondrej Palkovsky
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/* Lock ordering
30
 *
31
 * First the answerbox, then the phone
32
 */
33
 
1040 palkovsky 34
#include <synch/spinlock.h>
35
#include <synch/waitq.h>
1364 jermar 36
#include <synch/synch.h>
955 palkovsky 37
#include <ipc/ipc.h>
38
#include <errno.h>
39
#include <mm/slab.h>
40
#include <arch.h>
41
#include <proc/task.h>
42
#include <memstr.h>
43
#include <debug.h>
44
 
45
#include <print.h>
46
#include <proc/thread.h>
1258 palkovsky 47
#include <arch/interrupt.h>
1281 palkovsky 48
#include <ipc/irq.h>
955 palkovsky 49
 
965 palkovsky 50
/* Open channel that is assigned automatically to new tasks */
51
answerbox_t *ipc_phone_0 = NULL;
955 palkovsky 52
 
53
static slab_cache_t *ipc_call_slab;
54
 
1084 palkovsky 55
/* Initialize new call */
56
static void _ipc_call_init(call_t *call)
57
{
58
    memsetb((__address)call, sizeof(*call), 0);
59
    call->callerbox = &TASK->answerbox;
60
    call->sender = TASK;
61
}
62
 
955 palkovsky 63
/** Allocate & initialize call structure
64
 *
65
 * The call is initialized, so that the reply will be directed
66
 * to TASK->answerbox
1258 palkovsky 67
 *
68
 * @param flags Parameters for slab_alloc (ATOMIC, etc.)
955 palkovsky 69
 */
1258 palkovsky 70
call_t * ipc_call_alloc(int flags)
955 palkovsky 71
{
72
    call_t *call;
73
 
1258 palkovsky 74
    call = slab_alloc(ipc_call_slab, flags);
1084 palkovsky 75
    _ipc_call_init(call);
955 palkovsky 76
 
77
    return call;
78
}
79
 
965 palkovsky 80
/** Initialize allocated call */
1084 palkovsky 81
void ipc_call_static_init(call_t *call)
965 palkovsky 82
{
1084 palkovsky 83
    _ipc_call_init(call);
84
    call->flags |= IPC_CALL_STATIC_ALLOC;
965 palkovsky 85
}
86
 
955 palkovsky 87
/** Deallocate call stracuture */
88
void ipc_call_free(call_t *call)
89
{
90
    slab_free(ipc_call_slab, call);
91
}
92
 
93
/** Initialize answerbox structure
94
 */
95
void ipc_answerbox_init(answerbox_t *box)
96
{
1040 palkovsky 97
    spinlock_initialize(&box->lock, "ipc_box_lock");
1258 palkovsky 98
    spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
1040 palkovsky 99
    waitq_initialize(&box->wq);
955 palkovsky 100
    list_initialize(&box->connected_phones);
101
    list_initialize(&box->calls);
102
    list_initialize(&box->dispatched_calls);
103
    list_initialize(&box->answers);
1258 palkovsky 104
    list_initialize(&box->irq_notifs);
1027 palkovsky 105
    box->task = TASK;
955 palkovsky 106
}
107
 
1040 palkovsky 108
/** Connect phone to answerbox */
109
void ipc_phone_connect(phone_t *phone, answerbox_t *box)
955 palkovsky 110
{
1084 palkovsky 111
    spinlock_lock(&phone->lock);
112
 
1568 palkovsky 113
    phone->state = IPC_PHONE_CONNECTED;
955 palkovsky 114
    phone->callee = box;
965 palkovsky 115
 
1040 palkovsky 116
    spinlock_lock(&box->lock);
1573 palkovsky 117
    list_append(&phone->link, &box->connected_phones);
1040 palkovsky 118
    spinlock_unlock(&box->lock);
1084 palkovsky 119
 
120
    spinlock_unlock(&phone->lock);
955 palkovsky 121
}
122
 
1223 jermar 123
/** Initialize phone structure and connect phone to answerbox
1040 palkovsky 124
 */
125
void ipc_phone_init(phone_t *phone)
126
{
127
    spinlock_initialize(&phone->lock, "phone_lock");
128
    phone->callee = NULL;
1568 palkovsky 129
    phone->state = IPC_PHONE_FREE;
1088 palkovsky 130
    atomic_set(&phone->active_calls, 0);
1040 palkovsky 131
}
132
 
959 palkovsky 133
/** Helper function to facilitate synchronous calls */
134
void ipc_call_sync(phone_t *phone, call_t *request)
135
{
136
    answerbox_t sync_box;
955 palkovsky 137
 
959 palkovsky 138
    ipc_answerbox_init(&sync_box);
139
 
140
    /* We will receive data on special box */
141
    request->callerbox = &sync_box;
142
 
143
    ipc_call(phone, request);
1502 jermar 144
    ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
959 palkovsky 145
}
146
 
1084 palkovsky 147
/** Answer message that was not dispatched and is not entered in
148
 * any queue
149
 */
150
static void _ipc_answer_free_call(call_t *call)
151
{
152
    answerbox_t *callerbox = call->callerbox;
153
 
154
    call->flags |= IPC_CALL_ANSWERED;
155
 
156
    spinlock_lock(&callerbox->lock);
1573 palkovsky 157
    list_append(&call->link, &callerbox->answers);
1084 palkovsky 158
    spinlock_unlock(&callerbox->lock);
159
    waitq_wakeup(&callerbox->wq, 0);
160
}
161
 
162
/** Answer message, that is in callee queue
163
 *
164
 * @param box Answerbox that is answering the message
165
 * @param call Modified request that is being sent back
166
 */
167
void ipc_answer(answerbox_t *box, call_t *call)
168
{
169
    /* Remove from active box */
170
    spinlock_lock(&box->lock);
1573 palkovsky 171
    list_remove(&call->link);
1084 palkovsky 172
    spinlock_unlock(&box->lock);
173
    /* Send back answer */
174
    _ipc_answer_free_call(call);
175
}
176
 
1090 palkovsky 177
/** Simulate sending back a message
178
 *
179
 * Most errors are better handled by forming a normal backward
180
 * message and sending it as a normal answer.
181
 */
182
void ipc_backsend_err(phone_t *phone, call_t *call, __native err)
183
{
184
    call->data.phone = phone;
185
    atomic_inc(&phone->active_calls);
1568 palkovsky 186
    IPC_SET_RETVAL(call->data, err);
1090 palkovsky 187
    _ipc_answer_free_call(call);
188
}
189
 
1086 palkovsky 190
/* Unsafe unchecking ipc_call */
191
static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
192
{
1088 palkovsky 193
    if (! (call->flags & IPC_CALL_FORWARDED)) {
194
        atomic_inc(&phone->active_calls);
195
        call->data.phone = phone;
196
    }
1086 palkovsky 197
 
198
    spinlock_lock(&box->lock);
1573 palkovsky 199
    list_append(&call->link, &box->calls);
1086 palkovsky 200
    spinlock_unlock(&box->lock);
201
    waitq_wakeup(&box->wq, 0);
202
}
203
 
959 palkovsky 204
/** Send a asynchronous request using phone to answerbox
955 palkovsky 205
 *
206
 * @param phone Phone connected to answerbox
207
 * @param request Request to be sent
208
 */
1088 palkovsky 209
int ipc_call(phone_t *phone, call_t *call)
955 palkovsky 210
{
1084 palkovsky 211
    answerbox_t *box;
955 palkovsky 212
 
1084 palkovsky 213
    spinlock_lock(&phone->lock);
1568 palkovsky 214
    if (phone->state != IPC_PHONE_CONNECTED) {
1086 palkovsky 215
        spinlock_unlock(&phone->lock);
1088 palkovsky 216
        if (call->flags & IPC_CALL_FORWARDED) {
217
            IPC_SET_RETVAL(call->data, EFORWARD);
1090 palkovsky 218
            _ipc_answer_free_call(call);
1568 palkovsky 219
        } else {
220
            if (phone->state == IPC_PHONE_HUNGUP)
1090 palkovsky 221
                ipc_backsend_err(phone, call, EHANGUP);
1088 palkovsky 222
            else
1090 palkovsky 223
                ipc_backsend_err(phone, call, ENOENT);
1088 palkovsky 224
        }
225
        return ENOENT;
1084 palkovsky 226
    }
1568 palkovsky 227
    box = phone->callee;
1086 palkovsky 228
    _ipc_call(phone, box, call);
229
 
230
    spinlock_unlock(&phone->lock);
1088 palkovsky 231
    return 0;
1086 palkovsky 232
}
955 palkovsky 233
 
1086 palkovsky 234
/** Disconnect phone from answerbox
235
 *
1568 palkovsky 236
 * This call leaves the phone in HUNGUP state. The change to 'free' is done
237
 * lazily later.
1086 palkovsky 238
 *
1568 palkovsky 239
 * @param phone Phone to be hung up
240
 *              
1086 palkovsky 241
 * @return 0 - phone disconnected, -1 - the phone was already disconnected
242
 */
1591 palkovsky 243
int ipc_phone_hangup(phone_t *phone)
1086 palkovsky 244
{
245
    answerbox_t *box;
246
    call_t *call;
247
 
248
    spinlock_lock(&phone->lock);
1568 palkovsky 249
    if (phone->state == IPC_PHONE_FREE || phone->state ==IPC_PHONE_HUNGUP \
250
        || phone->state == IPC_PHONE_CONNECTING) {
251
        spinlock_unlock(&phone->lock);
252
        return -1;
253
    }
1086 palkovsky 254
    box = phone->callee;
1568 palkovsky 255
    if (phone->state != IPC_PHONE_SLAMMED) {
256
        /* Remove myself from answerbox */
257
        spinlock_lock(&box->lock);
1573 palkovsky 258
        list_remove(&phone->link);
1568 palkovsky 259
        spinlock_unlock(&box->lock);
260
 
261
        if (phone->state != IPC_PHONE_SLAMMED) {
262
            call = ipc_call_alloc(0);
263
            IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
264
            call->flags |= IPC_CALL_DISCARD_ANSWER;
265
            _ipc_call(phone, box, call);
1088 palkovsky 266
        }
1086 palkovsky 267
    }
268
 
1568 palkovsky 269
    phone->state = IPC_PHONE_HUNGUP;
1084 palkovsky 270
    spinlock_unlock(&phone->lock);
1086 palkovsky 271
 
272
    return 0;
955 palkovsky 273
}
274
 
1040 palkovsky 275
/** Forwards call from one answerbox to a new one
276
 *
1342 jermar 277
 * @param call Call to be redirected.
278
 * @param newphone Phone to target answerbox.
1040 palkovsky 279
 * @param oldbox Old answerbox
1088 palkovsky 280
 * @return 0 on forward ok, error code, if there was error
281
 *
282
 * - the return value serves only as an information for the forwarder,
283
 *   the original caller is notified automatically with EFORWARD
1040 palkovsky 284
 */
1088 palkovsky 285
int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox)
1040 palkovsky 286
{
287
    spinlock_lock(&oldbox->lock);
1573 palkovsky 288
    list_remove(&call->link);
1040 palkovsky 289
    spinlock_unlock(&oldbox->lock);
290
 
1088 palkovsky 291
    return ipc_call(newphone, call);
1040 palkovsky 292
}
293
 
955 palkovsky 294
 
295
/** Wait for phone call
296
 *
1364 jermar 297
 * @param box Answerbox expecting the call.
298
 * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
299
 *         decription of its special meaning.
1502 jermar 300
 * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
301
 *      for description of its special meaning.
955 palkovsky 302
 * @return Recived message address
303
 * - to distinguish between call and answer, look at call->flags
304
 */
1502 jermar 305
call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags)
955 palkovsky 306
{
307
    call_t *request;
1258 palkovsky 308
    ipl_t ipl;
1364 jermar 309
    int rc;
955 palkovsky 310
 
1364 jermar 311
restart:
1502 jermar 312
    rc = waitq_sleep_timeout(&box->wq, usec, flags);
1364 jermar 313
    if (SYNCH_FAILED(rc))
314
        return NULL;
1086 palkovsky 315
 
1040 palkovsky 316
    spinlock_lock(&box->lock);
1258 palkovsky 317
    if (!list_empty(&box->irq_notifs)) {
318
        ipl = interrupts_disable();
319
        spinlock_lock(&box->irq_lock);
320
 
1573 palkovsky 321
        request = list_get_instance(box->irq_notifs.next, call_t, link);
322
        list_remove(&request->link);
1258 palkovsky 323
 
324
        spinlock_unlock(&box->irq_lock);
325
        interrupts_restore(ipl);
326
    } else if (!list_empty(&box->answers)) {
1086 palkovsky 327
        /* Handle asynchronous answers */
1573 palkovsky 328
        request = list_get_instance(box->answers.next, call_t, link);
329
        list_remove(&request->link);
1086 palkovsky 330
        atomic_dec(&request->data.phone->active_calls);
331
    } else if (!list_empty(&box->calls)) {
332
        /* Handle requests */
1573 palkovsky 333
        request = list_get_instance(box->calls.next, call_t, link);
334
        list_remove(&request->link);
1086 palkovsky 335
        /* Append request to dispatch queue */
1573 palkovsky 336
        list_append(&request->link, &box->dispatched_calls);
1086 palkovsky 337
    } else {
1141 palkovsky 338
        /* This can happen regularly after ipc_cleanup, remove
339
         * the warning in the future when the IPC is
340
         * more debugged */
1086 palkovsky 341
        printf("WARNING: Spurious IPC wakeup.\n");
342
        spinlock_unlock(&box->lock);
343
        goto restart;
955 palkovsky 344
    }
1040 palkovsky 345
    spinlock_unlock(&box->lock);
955 palkovsky 346
    return request;
347
}
348
 
1141 palkovsky 349
/** Answer all calls from list with EHANGUP msg */
350
static void ipc_cleanup_call_list(link_t *lst)
351
{
352
    call_t *call;
353
 
354
    while (!list_empty(lst)) {
1573 palkovsky 355
        call = list_get_instance(lst->next, call_t, link);
356
        list_remove(&call->link);
1141 palkovsky 357
 
358
        IPC_SET_RETVAL(call->data, EHANGUP);
359
        _ipc_answer_free_call(call);
360
    }
361
}
362
 
1582 palkovsky 363
/** Cleans up all IPC communication of the current task
1072 palkovsky 364
 *
1582 palkovsky 365
 * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
366
 * have to change it as well if you want to cleanup other current then current.
1072 palkovsky 367
 */
1582 palkovsky 368
void ipc_cleanup(void)
1072 palkovsky 369
{
1088 palkovsky 370
    int i;
1141 palkovsky 371
    call_t *call;
372
    phone_t *phone;
1582 palkovsky 373
 
1088 palkovsky 374
    /* Disconnect all our phones ('ipc_phone_hangup') */
375
    for (i=0;i < IPC_MAX_PHONES; i++)
1591 palkovsky 376
        ipc_phone_hangup(&TASK->phones[i]);
1088 palkovsky 377
 
1258 palkovsky 378
    /* Disconnect all connected irqs */
1582 palkovsky 379
    ipc_irq_cleanup(&TASK->answerbox);
1258 palkovsky 380
 
1141 palkovsky 381
    /* Disconnect all phones connected to our answerbox */
382
restart_phones:
1582 palkovsky 383
    spinlock_lock(&TASK->answerbox.lock);
384
    while (!list_empty(&TASK->answerbox.connected_phones)) {
385
        phone = list_get_instance(TASK->answerbox.connected_phones.next,
1573 palkovsky 386
                      phone_t, link);
1141 palkovsky 387
        if (! spinlock_trylock(&phone->lock)) {
1582 palkovsky 388
            spinlock_unlock(&TASK->answerbox.lock);
1141 palkovsky 389
            goto restart_phones;
390
        }
391
 
392
        /* Disconnect phone */
1568 palkovsky 393
        ASSERT(phone->state == IPC_PHONE_CONNECTED);
394
        phone->state = IPC_PHONE_SLAMMED;
1573 palkovsky 395
        list_remove(&phone->link);
1088 palkovsky 396
 
1141 palkovsky 397
        spinlock_unlock(&phone->lock);
398
    }
399
 
1088 palkovsky 400
    /* Answer all messages in 'calls' and 'dispatched_calls' queues */
1582 palkovsky 401
    ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
402
    ipc_cleanup_call_list(&TASK->answerbox.calls);
403
    spinlock_unlock(&TASK->answerbox.lock);
1072 palkovsky 404
 
1088 palkovsky 405
    /* Wait for all async answers to arrive */
1568 palkovsky 406
    while (1) {
407
        /* Go through all phones, until all are FREE... */
408
        /* Locking not needed, no one else should modify
409
         * it, when we are in cleanup */
410
        for (i=0;i < IPC_MAX_PHONES; i++) {
1582 palkovsky 411
            if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
412
                atomic_get(&TASK->phones[i].active_calls) == 0)
413
                TASK->phones[i].state = IPC_PHONE_FREE;
414
 
1591 palkovsky 415
            /* Just for sure, we might have had some
416
             * IPC_PHONE_CONNECTING phones */
1582 palkovsky 417
            if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
1591 palkovsky 418
                ipc_phone_hangup(&TASK->phones[i]);
419
            /* If the hangup succeeded, it has sent a HANGUP
420
             * message, the IPC is now in HUNGUP state, we
421
             * wait for the reply to come */
1582 palkovsky 422
 
423
            if (TASK->phones[i].state != IPC_PHONE_FREE)
1568 palkovsky 424
                break;
425
        }
426
        /* Voila, got into cleanup */
427
        if (i == IPC_MAX_PHONES)
428
            break;
429
 
1582 palkovsky 430
        call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
1260 palkovsky 431
        ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF));
1141 palkovsky 432
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
433
 
1582 palkovsky 434
        atomic_dec(&TASK->active_calls);
1141 palkovsky 435
        ipc_call_free(call);
436
    }
1072 palkovsky 437
}
1258 palkovsky 438
 
439
 
440
/** Initilize ipc subsystem */
441
void ipc_init(void)
442
{
443
    ipc_call_slab = slab_cache_create("ipc_call",
444
                      sizeof(call_t),
445
                      0,
446
                      NULL, NULL, 0);
447
    ipc_irq_make_table(IRQ_COUNT);
448
}
449
 
1573 palkovsky 450
 
451
/** Kconsole - list answerbox contents */
452
void ipc_print_task(task_id_t taskid)
453
{
454
    task_t *task;
455
    int i;
456
    call_t *call;
457
    link_t *tmp;
458
 
459
    spinlock_lock(&tasks_lock);
460
    task = task_find_by_id(taskid);
461
    if (task)
462
        spinlock_lock(&task->lock);
463
    spinlock_unlock(&tasks_lock);
464
    if (!task)
465
        return;
466
 
467
    /* Print opened phones & details */
468
    printf("PHONE:\n");
469
    for (i=0; i < IPC_MAX_PHONES;i++) {
470
        spinlock_lock(&task->phones[i].lock);
471
        if (task->phones[i].state != IPC_PHONE_FREE) {
472
            printf("%d: ",i);
473
            switch (task->phones[i].state) {
474
            case IPC_PHONE_CONNECTING:
475
                printf("connecting ");
476
                break;
477
            case IPC_PHONE_CONNECTED:
478
                printf("connected to: %P ",
479
                       task->phones[i].callee);
480
                break;
481
            case IPC_PHONE_SLAMMED:
482
                printf("slammed by: %P ",
483
                       task->phones[i].callee);
484
                break;
485
            case IPC_PHONE_HUNGUP:
486
                printf("hung up - was: %P ",
487
                       task->phones[i].callee);
488
                break;
489
            default:
490
                break;
491
            }
492
            printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
493
        }
494
        spinlock_unlock(&task->phones[i].lock);
495
    }
496
 
497
 
498
    /* Print answerbox - calls */
499
    spinlock_lock(&task->answerbox.lock);
500
    printf("ABOX - CALLS:\n");
501
    for (tmp=task->answerbox.calls.next; tmp != &task->answerbox.calls;tmp = tmp->next) {
502
        call = list_get_instance(tmp, call_t, link);
503
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
504
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
505
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
506
    }
507
    /* Print answerbox - calls */
508
    printf("ABOX - DISPATCHED CALLS:\n");
509
    for (tmp=task->answerbox.dispatched_calls.next;
510
         tmp != &task->answerbox.dispatched_calls;
511
         tmp = tmp->next) {
512
        call = list_get_instance(tmp, call_t, link);
513
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
514
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
515
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
516
    }
517
    /* Print answerbox - calls */
518
    printf("ABOX - ANSWERS:\n");
519
    for (tmp=task->answerbox.answers.next; tmp != &task->answerbox.answers; tmp = tmp->next) {
520
        call = list_get_instance(tmp, call_t, link);
521
        printf("Callid:%P M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
522
               IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
523
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
524
    }
525
 
526
    spinlock_unlock(&task->answerbox.lock);
527
    spinlock_unlock(&task->lock);
528
}