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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
 
1705 cejka 29
 /** @addtogroup genericipc
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
955 palkovsky 35
/* Lock ordering
36
 *
37
 * First the answerbox, then the phone
38
 */
39
 
1040 palkovsky 40
#include <synch/spinlock.h>
41
#include <synch/waitq.h>
1364 jermar 42
#include <synch/synch.h>
955 palkovsky 43
#include <ipc/ipc.h>
44
#include <errno.h>
45
#include <mm/slab.h>
46
#include <arch.h>
47
#include <proc/task.h>
48
#include <memstr.h>
49
#include <debug.h>
50
 
51
#include <print.h>
52
#include <proc/thread.h>
1258 palkovsky 53
#include <arch/interrupt.h>
1281 palkovsky 54
#include <ipc/irq.h>
955 palkovsky 55
 
965 palkovsky 56
/* Open channel that is assigned automatically to new tasks */
57
answerbox_t *ipc_phone_0 = NULL;
955 palkovsky 58
 
59
static slab_cache_t *ipc_call_slab;
60
 
1084 palkovsky 61
/* Initialize new call */
62
static void _ipc_call_init(call_t *call)
63
{
64
    memsetb((__address)call, sizeof(*call), 0);
65
    call->callerbox = &TASK->answerbox;
66
    call->sender = TASK;
67
}
68
 
955 palkovsky 69
/** Allocate & initialize call structure
70
 *
71
 * The call is initialized, so that the reply will be directed
72
 * to TASK->answerbox
1258 palkovsky 73
 *
74
 * @param flags Parameters for slab_alloc (ATOMIC, etc.)
955 palkovsky 75
 */
1258 palkovsky 76
call_t * ipc_call_alloc(int flags)
955 palkovsky 77
{
78
    call_t *call;
79
 
1258 palkovsky 80
    call = slab_alloc(ipc_call_slab, flags);
1084 palkovsky 81
    _ipc_call_init(call);
955 palkovsky 82
 
83
    return call;
84
}
85
 
965 palkovsky 86
/** Initialize allocated call */
1084 palkovsky 87
void ipc_call_static_init(call_t *call)
965 palkovsky 88
{
1084 palkovsky 89
    _ipc_call_init(call);
90
    call->flags |= IPC_CALL_STATIC_ALLOC;
965 palkovsky 91
}
92
 
955 palkovsky 93
/** Deallocate call stracuture */
94
void ipc_call_free(call_t *call)
95
{
96
    slab_free(ipc_call_slab, call);
97
}
98
 
99
/** Initialize answerbox structure
100
 */
101
void ipc_answerbox_init(answerbox_t *box)
102
{
1040 palkovsky 103
    spinlock_initialize(&box->lock, "ipc_box_lock");
1258 palkovsky 104
    spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
1040 palkovsky 105
    waitq_initialize(&box->wq);
955 palkovsky 106
    list_initialize(&box->connected_phones);
107
    list_initialize(&box->calls);
108
    list_initialize(&box->dispatched_calls);
109
    list_initialize(&box->answers);
1258 palkovsky 110
    list_initialize(&box->irq_notifs);
1027 palkovsky 111
    box->task = TASK;
955 palkovsky 112
}
113
 
1040 palkovsky 114
/** Connect phone to answerbox */
115
void ipc_phone_connect(phone_t *phone, answerbox_t *box)
955 palkovsky 116
{
1084 palkovsky 117
    spinlock_lock(&phone->lock);
118
 
1568 palkovsky 119
    phone->state = IPC_PHONE_CONNECTED;
955 palkovsky 120
    phone->callee = box;
965 palkovsky 121
 
1040 palkovsky 122
    spinlock_lock(&box->lock);
1573 palkovsky 123
    list_append(&phone->link, &box->connected_phones);
1040 palkovsky 124
    spinlock_unlock(&box->lock);
1084 palkovsky 125
 
126
    spinlock_unlock(&phone->lock);
955 palkovsky 127
}
128
 
1223 jermar 129
/** Initialize phone structure and connect phone to answerbox
1040 palkovsky 130
 */
131
void ipc_phone_init(phone_t *phone)
132
{
133
    spinlock_initialize(&phone->lock, "phone_lock");
134
    phone->callee = NULL;
1568 palkovsky 135
    phone->state = IPC_PHONE_FREE;
1088 palkovsky 136
    atomic_set(&phone->active_calls, 0);
1040 palkovsky 137
}
138
 
959 palkovsky 139
/** Helper function to facilitate synchronous calls */
140
void ipc_call_sync(phone_t *phone, call_t *request)
141
{
142
    answerbox_t sync_box;
955 palkovsky 143
 
959 palkovsky 144
    ipc_answerbox_init(&sync_box);
145
 
146
    /* We will receive data on special box */
147
    request->callerbox = &sync_box;
148
 
149
    ipc_call(phone, request);
1502 jermar 150
    ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
959 palkovsky 151
}
152
 
1084 palkovsky 153
/** Answer message that was not dispatched and is not entered in
154
 * any queue
155
 */
156
static void _ipc_answer_free_call(call_t *call)
157
{
158
    answerbox_t *callerbox = call->callerbox;
159
 
160
    call->flags |= IPC_CALL_ANSWERED;
161
 
162
    spinlock_lock(&callerbox->lock);
1573 palkovsky 163
    list_append(&call->link, &callerbox->answers);
1084 palkovsky 164
    spinlock_unlock(&callerbox->lock);
165
    waitq_wakeup(&callerbox->wq, 0);
166
}
167
 
168
/** Answer message, that is in callee queue
169
 *
170
 * @param box Answerbox that is answering the message
171
 * @param call Modified request that is being sent back
172
 */
173
void ipc_answer(answerbox_t *box, call_t *call)
174
{
175
    /* Remove from active box */
176
    spinlock_lock(&box->lock);
1573 palkovsky 177
    list_remove(&call->link);
1084 palkovsky 178
    spinlock_unlock(&box->lock);
179
    /* Send back answer */
180
    _ipc_answer_free_call(call);
181
}
182
 
1090 palkovsky 183
/** Simulate sending back a message
184
 *
185
 * Most errors are better handled by forming a normal backward
186
 * message and sending it as a normal answer.
187
 */
188
void ipc_backsend_err(phone_t *phone, call_t *call, __native err)
189
{
190
    call->data.phone = phone;
191
    atomic_inc(&phone->active_calls);
1568 palkovsky 192
    IPC_SET_RETVAL(call->data, err);
1090 palkovsky 193
    _ipc_answer_free_call(call);
194
}
195
 
1086 palkovsky 196
/* Unsafe unchecking ipc_call */
197
static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
198
{
1088 palkovsky 199
    if (! (call->flags & IPC_CALL_FORWARDED)) {
200
        atomic_inc(&phone->active_calls);
201
        call->data.phone = phone;
202
    }
1086 palkovsky 203
 
204
    spinlock_lock(&box->lock);
1573 palkovsky 205
    list_append(&call->link, &box->calls);
1086 palkovsky 206
    spinlock_unlock(&box->lock);
207
    waitq_wakeup(&box->wq, 0);
208
}
209
 
959 palkovsky 210
/** Send a asynchronous request using phone to answerbox
955 palkovsky 211
 *
1708 jermar 212
 * @param phone Phone connected to answerbox.
213
 * @param call Structure representing the call.
955 palkovsky 214
 */
1088 palkovsky 215
int ipc_call(phone_t *phone, call_t *call)
955 palkovsky 216
{
1084 palkovsky 217
    answerbox_t *box;
955 palkovsky 218
 
1084 palkovsky 219
    spinlock_lock(&phone->lock);
1568 palkovsky 220
    if (phone->state != IPC_PHONE_CONNECTED) {
1086 palkovsky 221
        spinlock_unlock(&phone->lock);
1088 palkovsky 222
        if (call->flags & IPC_CALL_FORWARDED) {
223
            IPC_SET_RETVAL(call->data, EFORWARD);
1090 palkovsky 224
            _ipc_answer_free_call(call);
1568 palkovsky 225
        } else {
226
            if (phone->state == IPC_PHONE_HUNGUP)
1090 palkovsky 227
                ipc_backsend_err(phone, call, EHANGUP);
1088 palkovsky 228
            else
1090 palkovsky 229
                ipc_backsend_err(phone, call, ENOENT);
1088 palkovsky 230
        }
231
        return ENOENT;
1084 palkovsky 232
    }
1568 palkovsky 233
    box = phone->callee;
1086 palkovsky 234
    _ipc_call(phone, box, call);
235
 
236
    spinlock_unlock(&phone->lock);
1088 palkovsky 237
    return 0;
1086 palkovsky 238
}
955 palkovsky 239
 
1086 palkovsky 240
/** Disconnect phone from answerbox
241
 *
1568 palkovsky 242
 * This call leaves the phone in HUNGUP state. The change to 'free' is done
243
 * lazily later.
1086 palkovsky 244
 *
1568 palkovsky 245
 * @param phone Phone to be hung up
246
 *              
1086 palkovsky 247
 * @return 0 - phone disconnected, -1 - the phone was already disconnected
248
 */
1591 palkovsky 249
int ipc_phone_hangup(phone_t *phone)
1086 palkovsky 250
{
251
    answerbox_t *box;
252
    call_t *call;
253
 
254
    spinlock_lock(&phone->lock);
1568 palkovsky 255
    if (phone->state == IPC_PHONE_FREE || phone->state ==IPC_PHONE_HUNGUP \
256
        || phone->state == IPC_PHONE_CONNECTING) {
257
        spinlock_unlock(&phone->lock);
258
        return -1;
259
    }
1086 palkovsky 260
    box = phone->callee;
1568 palkovsky 261
    if (phone->state != IPC_PHONE_SLAMMED) {
262
        /* Remove myself from answerbox */
263
        spinlock_lock(&box->lock);
1573 palkovsky 264
        list_remove(&phone->link);
1568 palkovsky 265
        spinlock_unlock(&box->lock);
266
 
267
        if (phone->state != IPC_PHONE_SLAMMED) {
268
            call = ipc_call_alloc(0);
269
            IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
270
            call->flags |= IPC_CALL_DISCARD_ANSWER;
271
            _ipc_call(phone, box, call);
1088 palkovsky 272
        }
1086 palkovsky 273
    }
274
 
1568 palkovsky 275
    phone->state = IPC_PHONE_HUNGUP;
1084 palkovsky 276
    spinlock_unlock(&phone->lock);
1086 palkovsky 277
 
278
    return 0;
955 palkovsky 279
}
280
 
1040 palkovsky 281
/** Forwards call from one answerbox to a new one
282
 *
1342 jermar 283
 * @param call Call to be redirected.
284
 * @param newphone Phone to target answerbox.
1040 palkovsky 285
 * @param oldbox Old answerbox
1088 palkovsky 286
 * @return 0 on forward ok, error code, if there was error
287
 *
288
 * - the return value serves only as an information for the forwarder,
289
 *   the original caller is notified automatically with EFORWARD
1040 palkovsky 290
 */
1088 palkovsky 291
int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox)
1040 palkovsky 292
{
293
    spinlock_lock(&oldbox->lock);
1573 palkovsky 294
    list_remove(&call->link);
1040 palkovsky 295
    spinlock_unlock(&oldbox->lock);
296
 
1088 palkovsky 297
    return ipc_call(newphone, call);
1040 palkovsky 298
}
299
 
955 palkovsky 300
 
301
/** Wait for phone call
302
 *
1364 jermar 303
 * @param box Answerbox expecting the call.
304
 * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
305
 *         decription of its special meaning.
1502 jermar 306
 * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
307
 *      for description of its special meaning.
955 palkovsky 308
 * @return Recived message address
309
 * - to distinguish between call and answer, look at call->flags
310
 */
1502 jermar 311
call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags)
955 palkovsky 312
{
313
    call_t *request;
1258 palkovsky 314
    ipl_t ipl;
1364 jermar 315
    int rc;
955 palkovsky 316
 
1364 jermar 317
restart:
1502 jermar 318
    rc = waitq_sleep_timeout(&box->wq, usec, flags);
1364 jermar 319
    if (SYNCH_FAILED(rc))
320
        return NULL;
1086 palkovsky 321
 
1040 palkovsky 322
    spinlock_lock(&box->lock);
1258 palkovsky 323
    if (!list_empty(&box->irq_notifs)) {
324
        ipl = interrupts_disable();
325
        spinlock_lock(&box->irq_lock);
326
 
1573 palkovsky 327
        request = list_get_instance(box->irq_notifs.next, call_t, link);
328
        list_remove(&request->link);
1258 palkovsky 329
 
330
        spinlock_unlock(&box->irq_lock);
331
        interrupts_restore(ipl);
332
    } else if (!list_empty(&box->answers)) {
1086 palkovsky 333
        /* Handle asynchronous answers */
1573 palkovsky 334
        request = list_get_instance(box->answers.next, call_t, link);
335
        list_remove(&request->link);
1086 palkovsky 336
        atomic_dec(&request->data.phone->active_calls);
337
    } else if (!list_empty(&box->calls)) {
338
        /* Handle requests */
1573 palkovsky 339
        request = list_get_instance(box->calls.next, call_t, link);
340
        list_remove(&request->link);
1086 palkovsky 341
        /* Append request to dispatch queue */
1573 palkovsky 342
        list_append(&request->link, &box->dispatched_calls);
1086 palkovsky 343
    } else {
1595 palkovsky 344
        /* This can happen regularly after ipc_cleanup */
1086 palkovsky 345
        spinlock_unlock(&box->lock);
346
        goto restart;
955 palkovsky 347
    }
1040 palkovsky 348
    spinlock_unlock(&box->lock);
955 palkovsky 349
    return request;
350
}
351
 
1141 palkovsky 352
/** Answer all calls from list with EHANGUP msg */
353
static void ipc_cleanup_call_list(link_t *lst)
354
{
355
    call_t *call;
356
 
357
    while (!list_empty(lst)) {
1573 palkovsky 358
        call = list_get_instance(lst->next, call_t, link);
359
        list_remove(&call->link);
1141 palkovsky 360
 
361
        IPC_SET_RETVAL(call->data, EHANGUP);
362
        _ipc_answer_free_call(call);
363
    }
364
}
365
 
1582 palkovsky 366
/** Cleans up all IPC communication of the current task
1072 palkovsky 367
 *
1582 palkovsky 368
 * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
369
 * have to change it as well if you want to cleanup other current then current.
1072 palkovsky 370
 */
1582 palkovsky 371
void ipc_cleanup(void)
1072 palkovsky 372
{
1088 palkovsky 373
    int i;
1141 palkovsky 374
    call_t *call;
375
    phone_t *phone;
1582 palkovsky 376
 
1088 palkovsky 377
    /* Disconnect all our phones ('ipc_phone_hangup') */
378
    for (i=0;i < IPC_MAX_PHONES; i++)
1591 palkovsky 379
        ipc_phone_hangup(&TASK->phones[i]);
1088 palkovsky 380
 
1258 palkovsky 381
    /* Disconnect all connected irqs */
1582 palkovsky 382
    ipc_irq_cleanup(&TASK->answerbox);
1258 palkovsky 383
 
1141 palkovsky 384
    /* Disconnect all phones connected to our answerbox */
385
restart_phones:
1582 palkovsky 386
    spinlock_lock(&TASK->answerbox.lock);
387
    while (!list_empty(&TASK->answerbox.connected_phones)) {
388
        phone = list_get_instance(TASK->answerbox.connected_phones.next,
1573 palkovsky 389
                      phone_t, link);
1141 palkovsky 390
        if (! spinlock_trylock(&phone->lock)) {
1582 palkovsky 391
            spinlock_unlock(&TASK->answerbox.lock);
1141 palkovsky 392
            goto restart_phones;
393
        }
394
 
395
        /* Disconnect phone */
1568 palkovsky 396
        ASSERT(phone->state == IPC_PHONE_CONNECTED);
397
        phone->state = IPC_PHONE_SLAMMED;
1573 palkovsky 398
        list_remove(&phone->link);
1088 palkovsky 399
 
1141 palkovsky 400
        spinlock_unlock(&phone->lock);
401
    }
402
 
1088 palkovsky 403
    /* Answer all messages in 'calls' and 'dispatched_calls' queues */
1582 palkovsky 404
    ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
405
    ipc_cleanup_call_list(&TASK->answerbox.calls);
406
    spinlock_unlock(&TASK->answerbox.lock);
1072 palkovsky 407
 
1088 palkovsky 408
    /* Wait for all async answers to arrive */
1568 palkovsky 409
    while (1) {
410
        /* Go through all phones, until all are FREE... */
411
        /* Locking not needed, no one else should modify
412
         * it, when we are in cleanup */
413
        for (i=0;i < IPC_MAX_PHONES; i++) {
1582 palkovsky 414
            if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
415
                atomic_get(&TASK->phones[i].active_calls) == 0)
416
                TASK->phones[i].state = IPC_PHONE_FREE;
417
 
1591 palkovsky 418
            /* Just for sure, we might have had some
419
             * IPC_PHONE_CONNECTING phones */
1582 palkovsky 420
            if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
1591 palkovsky 421
                ipc_phone_hangup(&TASK->phones[i]);
422
            /* If the hangup succeeded, it has sent a HANGUP
423
             * message, the IPC is now in HUNGUP state, we
424
             * wait for the reply to come */
1582 palkovsky 425
 
426
            if (TASK->phones[i].state != IPC_PHONE_FREE)
1568 palkovsky 427
                break;
428
        }
429
        /* Voila, got into cleanup */
430
        if (i == IPC_MAX_PHONES)
431
            break;
432
 
1582 palkovsky 433
        call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
1260 palkovsky 434
        ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF));
1141 palkovsky 435
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
436
 
1582 palkovsky 437
        atomic_dec(&TASK->active_calls);
1141 palkovsky 438
        ipc_call_free(call);
439
    }
1072 palkovsky 440
}
1258 palkovsky 441
 
442
 
443
/** Initilize ipc subsystem */
444
void ipc_init(void)
445
{
446
    ipc_call_slab = slab_cache_create("ipc_call",
447
                      sizeof(call_t),
448
                      0,
449
                      NULL, NULL, 0);
450
    ipc_irq_make_table(IRQ_COUNT);
451
}
452
 
1573 palkovsky 453
 
454
/** Kconsole - list answerbox contents */
455
void ipc_print_task(task_id_t taskid)
456
{
457
    task_t *task;
458
    int i;
459
    call_t *call;
460
    link_t *tmp;
461
 
462
    spinlock_lock(&tasks_lock);
463
    task = task_find_by_id(taskid);
464
    if (task)
465
        spinlock_lock(&task->lock);
466
    spinlock_unlock(&tasks_lock);
467
    if (!task)
468
        return;
469
 
470
    /* Print opened phones & details */
471
    printf("PHONE:\n");
472
    for (i=0; i < IPC_MAX_PHONES;i++) {
473
        spinlock_lock(&task->phones[i].lock);
474
        if (task->phones[i].state != IPC_PHONE_FREE) {
475
            printf("%d: ",i);
476
            switch (task->phones[i].state) {
477
            case IPC_PHONE_CONNECTING:
478
                printf("connecting ");
479
                break;
480
            case IPC_PHONE_CONNECTED:
481
                printf("connected to: %P ",
482
                       task->phones[i].callee);
483
                break;
484
            case IPC_PHONE_SLAMMED:
485
                printf("slammed by: %P ",
486
                       task->phones[i].callee);
487
                break;
488
            case IPC_PHONE_HUNGUP:
489
                printf("hung up - was: %P ",
490
                       task->phones[i].callee);
491
                break;
492
            default:
493
                break;
494
            }
495
            printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
496
        }
497
        spinlock_unlock(&task->phones[i].lock);
498
    }
499
 
500
 
501
    /* Print answerbox - calls */
502
    spinlock_lock(&task->answerbox.lock);
503
    printf("ABOX - CALLS:\n");
504
    for (tmp=task->answerbox.calls.next; tmp != &task->answerbox.calls;tmp = tmp->next) {
505
        call = list_get_instance(tmp, call_t, link);
506
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
507
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
508
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
509
    }
510
    /* Print answerbox - calls */
511
    printf("ABOX - DISPATCHED CALLS:\n");
512
    for (tmp=task->answerbox.dispatched_calls.next;
513
         tmp != &task->answerbox.dispatched_calls;
514
         tmp = tmp->next) {
515
        call = list_get_instance(tmp, call_t, link);
516
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
517
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
518
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
519
    }
520
    /* Print answerbox - calls */
521
    printf("ABOX - ANSWERS:\n");
522
    for (tmp=task->answerbox.answers.next; tmp != &task->answerbox.answers; tmp = tmp->next) {
523
        call = list_get_instance(tmp, call_t, link);
524
        printf("Callid:%P M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
525
               IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
526
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
527
    }
528
 
529
    spinlock_unlock(&task->answerbox.lock);
530
    spinlock_unlock(&task->lock);
531
}
1702 cejka 532
 
533
 /** @}
534
 */
535