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1351 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
 
1392 palkovsky 29
/**
30
 * Asynchronous library
31
 *
32
 * The aim of this library is facilitating writing programs utilizing
33
 * the asynchronous nature of Helenos IPC, yet using a normal way
34
 * of programming.
35
 *
36
 * You should be able to write very simple multithreaded programs,
37
 * the async framework will automatically take care of most synchronization
38
 * problems.
39
 *
40
 * Default semantics:
41
 * - send() - send asynchronously. If the kernel refuses to send more
42
 *            messages, [ try to get responses from kernel, if nothing
43
 *            found, might try synchronous ]
44
 *
45
 * Example of use:
46
 *
47
 * 1) Multithreaded client application
48
 *  create_thread(thread1);
49
 *  create_thread(thread2);
50
 *  ...
51
 *  
52
 *  thread1() {
53
 *        conn = ipc_connect_me_to();
54
 *        c1 = send(conn);
55
 *        c2 = send(conn);
56
 *        wait_for(c1);
57
 *        wait_for(c2);
58
 *  }
59
 *
60
 *
61
 * 2) Multithreaded server application
62
 * main() {
1407 palkovsky 63
 *      async_manager();
1392 palkovsky 64
 * }
65
 *
66
 *
1407 palkovsky 67
 * client_connection(icallid, *icall) {
68
 *       if (want_refuse) {
69
 *           ipc_answer_fast(icallid, ELIMIT, 0, 0);
70
 *           return;
71
 *       }
72
 *       ipc_answer_fast(icallid, 0, 0, 0);
1392 palkovsky 73
 *
1407 palkovsky 74
 *       callid = async_get_call(&call);
75
 *       handle(callid, call);
76
 *       ipc_answer_fast(callid, 1,2,3);
77
 *
78
 *       callid = async_get_call(&call);
1392 palkovsky 79
 *       ....
80
 * }
1404 palkovsky 81
 *
1405 decky 82
 * TODO: Detaching/joining dead psthreads?
1392 palkovsky 83
 */
84
#include <futex.h>
85
#include <async.h>
86
#include <psthread.h>
87
#include <stdio.h>
88
#include <libadt/hash_table.h>
89
#include <libadt/list.h>
90
#include <ipc/ipc.h>
91
#include <assert.h>
92
#include <errno.h>
1441 palkovsky 93
#include <time.h>
94
#include <arch/barrier.h>
1392 palkovsky 95
 
1427 palkovsky 96
static atomic_t async_futex = FUTEX_INITIALIZER;
1392 palkovsky 97
static hash_table_t conn_hash_table;
1441 palkovsky 98
static LIST_INITIALIZE(timeout_list);
1392 palkovsky 99
 
100
typedef struct {
1427 palkovsky 101
    pstid_t ptid;                /**< Thread waiting for this message */
102
    int active;                  /**< If this thread is currently active */
103
    int done;                    /**< If reply was received */
104
    ipc_call_t *dataptr;         /**< Pointer where the answer data
105
                      *   should be stored */
1441 palkovsky 106
    struct timeval expires;      /**< Expiration time for waiting thread */
107
    int has_timeout;             /**< If true, this struct is in timeout list */
108
    link_t link;
109
 
1427 palkovsky 110
    ipcarg_t retval;
111
} amsg_t;
112
 
113
typedef struct {
1392 palkovsky 114
    link_t link;
115
    ipc_callid_t callid;
116
    ipc_call_t call;
117
} msg_t;
118
 
119
typedef struct {
120
    link_t link;
121
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
122
    link_t msg_queue;              /**< Messages that should be delivered to this thread */
123
    pstid_t ptid;                /**< Thread associated with this connection */
124
    int active;                     /**< If this thread is currently active */
125
    /* Structures for connection opening packet */
126
    ipc_callid_t callid;
127
    ipc_call_t call;
1407 palkovsky 128
    void (*cthread)(ipc_callid_t,ipc_call_t *);
1392 palkovsky 129
} connection_t;
130
 
131
__thread connection_t *PS_connection;
132
 
1441 palkovsky 133
/** Add microseconds to give timeval */
134
static void tv_add(struct timeval *tv, suseconds_t usecs)
135
{
136
    tv->tv_sec += usecs / 1000000;
137
    tv->tv_usec += usecs % 1000000;
138
    if (tv->tv_usec > 1000000) {
139
        tv->tv_sec++;
140
        tv->tv_usec -= 1000000;
141
    }
142
}
143
 
144
/** Subtract 2 timevals, return microseconds difference */
145
static suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
146
{
147
    suseconds_t result;
148
 
149
    result = tv1->tv_usec - tv2->tv_usec;
150
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
151
 
152
    return result;
153
}
154
 
155
/** Compare timeval
156
 *
157
 * @return 1 if tv1 > tv2, otherwise 0
158
 */
159
static int tv_gt(struct timeval *tv1, struct timeval *tv2)
160
{
161
    if (tv1->tv_sec > tv2->tv_sec)
162
        return 1;
163
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
164
        return 1;
165
    return 0;
166
}
167
 
1392 palkovsky 168
/* Hash table functions */
1404 palkovsky 169
#define CONN_HASH_TABLE_CHAINS  32
1392 palkovsky 170
 
171
static hash_index_t conn_hash(unsigned long *key)
1351 palkovsky 172
{
1392 palkovsky 173
    assert(key);
1404 palkovsky 174
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
1351 palkovsky 175
}
176
 
1392 palkovsky 177
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
1351 palkovsky 178
{
1392 palkovsky 179
    connection_t *hs;
180
 
181
    hs = hash_table_get_instance(item, connection_t, link);
182
 
183
    return key[0] == hs->in_phone_hash;
1351 palkovsky 184
}
185
 
1392 palkovsky 186
static void conn_remove(link_t *item)
1351 palkovsky 187
{
1392 palkovsky 188
    free(hash_table_get_instance(item, connection_t, link));
1351 palkovsky 189
}
190
 
1392 palkovsky 191
 
192
/** Operations for NS hash table. */
193
static hash_table_operations_t conn_hash_table_ops = {
194
    .hash = conn_hash,
195
    .compare = conn_compare,
196
    .remove_callback = conn_remove
197
};
198
 
1427 palkovsky 199
/*************************************************/
200
 
1392 palkovsky 201
/** Try to route a call to an appropriate connection thread
202
 *
203
 */
204
static int route_call(ipc_callid_t callid, ipc_call_t *call)
1351 palkovsky 205
{
1392 palkovsky 206
    connection_t *conn;
207
    msg_t *msg;
208
    link_t *hlp;
209
    unsigned long key;
210
 
1427 palkovsky 211
    futex_down(&async_futex);
1392 palkovsky 212
 
213
    key = call->in_phone_hash;
214
    hlp = hash_table_find(&conn_hash_table, &key);
215
    if (!hlp) {
1427 palkovsky 216
        futex_up(&async_futex);
1392 palkovsky 217
        return 0;
1351 palkovsky 218
    }
1392 palkovsky 219
    conn = hash_table_get_instance(hlp, connection_t, link);
1351 palkovsky 220
 
1392 palkovsky 221
    msg = malloc(sizeof(*msg));
222
    msg->callid = callid;
223
    msg->call = *call;
224
    list_append(&msg->link, &conn->msg_queue);
225
 
226
    if (!conn->active) {
227
        conn->active = 1;
228
        psthread_add_ready(conn->ptid);
229
    }
1351 palkovsky 230
 
1427 palkovsky 231
    futex_up(&async_futex);
1392 palkovsky 232
 
233
    return 1;
234
}
235
 
1404 palkovsky 236
/** Return new incoming message for current(thread-local) connection */
1392 palkovsky 237
ipc_callid_t async_get_call(ipc_call_t *call)
238
{
239
    msg_t *msg;
240
    ipc_callid_t callid;
241
    connection_t *conn;
242
 
1427 palkovsky 243
    futex_down(&async_futex);
1392 palkovsky 244
 
245
    conn = PS_connection;
246
    /* If nothing in queue, wait until something appears */
247
    if (list_empty(&conn->msg_queue)) {
248
        conn->active = 0;
249
        psthread_schedule_next_adv(PS_TO_MANAGER);
1351 palkovsky 250
    }
251
 
1392 palkovsky 252
    msg = list_get_instance(conn->msg_queue.next, msg_t, link);
253
    list_remove(&msg->link);
254
    callid = msg->callid;
255
    *call = msg->call;
256
    free(msg);
257
 
1427 palkovsky 258
    futex_up(&async_futex);
1392 palkovsky 259
    return callid;
1351 palkovsky 260
}
261
 
1404 palkovsky 262
/** Thread function that gets created on new connection
263
 *
264
 * This function is defined as a weak symbol - to be redefined in
265
 * user code.
266
 */
1392 palkovsky 267
void client_connection(ipc_callid_t callid, ipc_call_t *call)
268
{
1404 palkovsky 269
    ipc_answer_fast(callid, ENOENT, 0, 0);
1392 palkovsky 270
}
1351 palkovsky 271
 
1452 palkovsky 272
/** Function that gets created on interrupt receival
273
 *
274
 * This function is defined as a weak symbol - to be redefined in
275
 * user code.
276
 */
277
void interrupt_received(ipc_call_t *call)
278
{
279
}
280
 
281
 
1404 palkovsky 282
/** Wrapper for client connection thread
283
 *
284
 * When new connection arrives, thread with this function is created.
285
 * It calls client_connection and does final cleanup.
286
 *
287
 * @parameter arg Connection structure pointer
288
 */
1392 palkovsky 289
static int connection_thread(void  *arg)
1351 palkovsky 290
{
1404 palkovsky 291
    unsigned long key;
292
    msg_t *msg;
1408 palkovsky 293
    connection_t *conn;
1404 palkovsky 294
 
1392 palkovsky 295
    /* Setup thread local connection pointer */
296
    PS_connection = (connection_t *)arg;
1408 palkovsky 297
    conn = PS_connection;
298
    conn->cthread(conn->callid, &conn->call);
1392 palkovsky 299
 
1404 palkovsky 300
    /* Remove myself from connection hash table */
1427 palkovsky 301
    futex_down(&async_futex);
1408 palkovsky 302
    key = conn->in_phone_hash;
1404 palkovsky 303
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 304
    futex_up(&async_futex);
1404 palkovsky 305
    /* Answer all remaining messages with ehangup */
1408 palkovsky 306
    while (!list_empty(&conn->msg_queue)) {
307
        msg = list_get_instance(conn->msg_queue.next, msg_t, link);
1404 palkovsky 308
        list_remove(&msg->link);
309
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
310
        free(msg);
311
    }
1351 palkovsky 312
}
1392 palkovsky 313
 
314
/** Create new thread for a new connection
315
 *
316
 * Creates new thread for connection, fills in connection
317
 * structures and inserts it into the hash table, so that
318
 * later we can easily do routing of messages to particular
319
 * threads.
1407 palkovsky 320
 *
1452 palkovsky 321
 * @param in_phone_hash Identification of the incoming connection
1407 palkovsky 322
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
323
 * @param call Call data of the opening packet
324
 * @param cthread Thread function that should be called upon
325
 *                opening the connection
326
 * @return New thread id
1392 palkovsky 327
 */
1452 palkovsky 328
pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid,
329
                 ipc_call_t *call,
1407 palkovsky 330
                 void (*cthread)(ipc_callid_t,ipc_call_t *))
1392 palkovsky 331
{
332
    pstid_t ptid;
333
    connection_t *conn;
334
    unsigned long key;
335
 
336
    conn = malloc(sizeof(*conn));
337
    if (!conn) {
338
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 339
        return NULL;
1392 palkovsky 340
    }
1452 palkovsky 341
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 342
    list_initialize(&conn->msg_queue);
343
    conn->ptid = psthread_create(connection_thread, conn);
344
    conn->callid = callid;
345
    conn->call = *call;
346
    conn->active = 1; /* We will activate it asap */
1407 palkovsky 347
    conn->cthread = cthread;
1392 palkovsky 348
    list_initialize(&conn->link);
349
    if (!conn->ptid) {
350
        free(conn);
351
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 352
        return NULL;
1392 palkovsky 353
    }
354
    key = conn->in_phone_hash;
1427 palkovsky 355
    futex_down(&async_futex);
1392 palkovsky 356
    /* Add connection to hash table */
357
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 358
    futex_up(&async_futex);
1392 palkovsky 359
 
360
    psthread_add_ready(conn->ptid);
1407 palkovsky 361
 
362
    return conn->ptid;
1392 palkovsky 363
}
364
 
1427 palkovsky 365
/** Handle call that was received */
1392 palkovsky 366
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
367
{
1452 palkovsky 368
    /* Unrouted call - do some default behaviour */
1392 palkovsky 369
    switch (IPC_GET_METHOD(*call)) {
370
    case IPC_M_INTERRUPT:
1452 palkovsky 371
        interrupt_received(call);
372
        return;
1392 palkovsky 373
    case IPC_M_CONNECT_ME_TO:
374
        /* Open new connection with thread etc. */
1452 palkovsky 375
        async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
376
        return;
1392 palkovsky 377
    }
1452 palkovsky 378
 
379
    /* Try to route call through connection tables */
380
    if (route_call(callid, call))
381
        return;
382
 
383
    /* Unknown call from unknown phone - hang it up */
384
    ipc_answer_fast(callid, EHANGUP, 0, 0);
1392 palkovsky 385
}
386
 
1441 palkovsky 387
/** Fire all timeouts that expired */
388
static void handle_expired_timeouts(void)
389
{
390
    struct timeval tv;
391
    amsg_t *amsg;
392
    link_t *cur;
393
 
394
    gettimeofday(&tv,NULL);
395
    futex_down(&async_futex);
396
 
397
    cur = timeout_list.next;
398
    while (cur != &timeout_list) {
399
        amsg = list_get_instance(cur,amsg_t,link);
400
        if (tv_gt(&amsg->expires, &tv))
401
            break;
402
        cur = cur->next;
403
        list_remove(&amsg->link);
404
        amsg->has_timeout = 0;
405
        /* Redundant condition? The thread should not
406
         * be active when it gets here.
407
         */
408
        if (!amsg->active) {
409
            amsg->active = 1;
410
            psthread_add_ready(amsg->ptid);        
411
        }
412
    }
413
 
414
    futex_up(&async_futex);
415
}
416
 
1392 palkovsky 417
/** Endless loop dispatching incoming calls and answers */
1441 palkovsky 418
int async_manager(void)
1392 palkovsky 419
{
420
    ipc_call_t call;
421
    ipc_callid_t callid;
1435 palkovsky 422
    int timeout;
1441 palkovsky 423
    amsg_t *amsg;
424
    struct timeval tv;
1392 palkovsky 425
 
426
    while (1) {
427
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
1427 palkovsky 428
            futex_up(&async_futex); /* async_futex is always held
1392 palkovsky 429
                        * when entering manager thread
430
                        */
431
            continue;
432
        }
1441 palkovsky 433
        futex_down(&async_futex);
434
        if (!list_empty(&timeout_list)) {
435
            amsg = list_get_instance(timeout_list.next,amsg_t,link);
436
            gettimeofday(&tv,NULL);
437
            if (tv_gt(&tv, &amsg->expires)) {
438
                handle_expired_timeouts();
439
                continue;
440
            } else
441
                timeout = tv_sub(&amsg->expires, &tv);
442
        } else
1435 palkovsky 443
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 444
        futex_up(&async_futex);
445
 
1435 palkovsky 446
        callid = ipc_wait_cycle(&call, timeout, SYNCH_BLOCKING);
1392 palkovsky 447
 
1435 palkovsky 448
        if (!callid) {
1441 palkovsky 449
            handle_expired_timeouts();
1435 palkovsky 450
            continue;
451
        }
452
 
1392 palkovsky 453
        if (callid & IPC_CALLID_ANSWERED)
454
            continue;
1427 palkovsky 455
 
1392 palkovsky 456
        handle_call(callid, &call);
457
    }
458
}
459
 
1404 palkovsky 460
/** Function to start async_manager as a standalone thread
461
 *
462
 * When more kernel threads are used, one async manager should
463
 * exist per thread. The particular implementation may change,
464
 * currently one async_manager is started automatically per kernel
465
 * thread except main thread.
466
 */
1392 palkovsky 467
static int async_manager_thread(void *arg)
468
{
1427 palkovsky 469
    futex_up(&async_futex); /* async_futex is always locked when entering
1392 palkovsky 470
                * manager */
471
    async_manager();
472
}
473
 
474
/** Add one manager to manager list */
475
void async_create_manager(void)
476
{
477
    pstid_t ptid;
478
 
479
    ptid = psthread_create(async_manager_thread, NULL);
480
    psthread_add_manager(ptid);
481
}
482
 
483
/** Remove one manager from manager list */
484
void async_destroy_manager(void)
485
{
486
    psthread_remove_manager();
487
}
488
 
489
/** Initialize internal structures needed for async manager */
490
int _async_init(void)
491
{
1404 palkovsky 492
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
1392 palkovsky 493
        printf("%s: cannot create hash table\n", "async");
494
        return ENOMEM;
495
    }
496
 
497
}
1427 palkovsky 498
 
499
/** IPC handler for messages in async framework
500
 *
501
 * Notify thread that is waiting for this message, that it arrived
502
 */
503
static void reply_received(void *private, int retval,
504
               ipc_call_t *data)
505
{
506
    amsg_t *msg = (amsg_t *) private;
507
 
508
    msg->retval = retval;
509
 
510
    futex_down(&async_futex);
511
    /* Copy data after futex_down, just in case the
512
     * call was detached
513
     */
514
    if (msg->dataptr)
515
        *msg->dataptr = *data;
1435 palkovsky 516
 
1441 palkovsky 517
    write_barrier();
518
    /* Remove message from timeout list */
519
    if (msg->has_timeout)
520
        list_remove(&msg->link);
1427 palkovsky 521
    msg->done = 1;
522
    if (! msg->active) {
523
        msg->active = 1;
524
        psthread_add_ready(msg->ptid);
525
    }
526
    futex_up(&async_futex);
527
}
528
 
529
/** Send message and return id of the sent message
530
 *
531
 * The return value can be used as input for async_wait() to wait
532
 * for completion.
533
 */
534
aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
535
           ipc_call_t *dataptr)
536
{
537
    amsg_t *msg;
538
 
539
    msg = malloc(sizeof(*msg));
540
    msg->active = 1;
541
    msg->done = 0;
542
    msg->dataptr = dataptr;
543
    ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received);
544
 
545
    return (aid_t) msg;
546
}
547
 
548
/** Wait for a message sent by async framework
549
 *
550
 * @param amsgid Message ID to wait for
551
 * @param retval Pointer to variable where will be stored retval
552
 *               of the answered message. If NULL, it is ignored.
553
 *
554
 */
555
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
556
{
557
    amsg_t *msg = (amsg_t *) amsgid;
558
    connection_t *conn;
559
 
560
    futex_down(&async_futex);
561
    if (msg->done) {
562
        futex_up(&async_futex);
563
        goto done;
564
    }
565
 
566
    msg->ptid = psthread_get_id();
567
    msg->active = 0;
1441 palkovsky 568
    msg->has_timeout = 0;
1427 palkovsky 569
    /* Leave locked async_futex when entering this function */
570
    psthread_schedule_next_adv(PS_TO_MANAGER);
571
    /* futex is up automatically after psthread_schedule_next...*/
572
done:
573
    if (retval)
574
        *retval = msg->retval;
575
    free(msg);
576
}
1435 palkovsky 577
 
1441 palkovsky 578
/** Insert sort timeout msg into timeouts list
579
 *
580
 * Assume async_futex is held
581
 */
582
static void insert_timeout(amsg_t *msg)
583
{
584
    link_t *tmp;
585
    amsg_t *cur;
1435 palkovsky 586
 
1441 palkovsky 587
    tmp = timeout_list.next;
588
    while (tmp != &timeout_list) {
589
        cur = list_get_instance(tmp, amsg_t, link);
590
        if (tv_gt(&cur->expires, &msg->expires))
591
            break;
592
        tmp = tmp->next;
593
    }
594
    list_append(&msg->link, tmp);
595
}
1435 palkovsky 596
 
1441 palkovsky 597
/** Wait for a message sent by async framework with timeout
598
 *
599
 * @param amsgid Message ID to wait for
600
 * @param retval Pointer to variable where will be stored retval
601
 *               of the answered message. If NULL, it is ignored.
602
 * @param timeout Timeout in usecs
603
 * @return 0 on success, ETIMEOUT if timeout expired
604
 *
605
 */
606
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
607
{
608
    amsg_t *msg = (amsg_t *) amsgid;
609
    connection_t *conn;
1435 palkovsky 610
 
1441 palkovsky 611
    futex_down(&async_futex);
612
    if (msg->done) {
613
        futex_up(&async_futex);
614
        goto done;
615
    }
1435 palkovsky 616
 
1441 palkovsky 617
    msg->ptid = psthread_get_id();
618
    msg->active = 0;
619
    msg->has_timeout = 1;
1435 palkovsky 620
 
1441 palkovsky 621
    gettimeofday(&msg->expires, NULL);
622
    tv_add(&msg->expires, timeout);
623
    insert_timeout(msg);
1435 palkovsky 624
 
1441 palkovsky 625
    /* Leave locked async_futex when entering this function */
626
    psthread_schedule_next_adv(PS_TO_MANAGER);
627
    /* futex is up automatically after psthread_schedule_next...*/
1435 palkovsky 628
 
1441 palkovsky 629
    if (!msg->done)
630
        return ETIMEOUT;
631
 
632
done:
633
    if (retval)
634
        *retval = msg->retval;
635
    free(msg);
636
 
637
    return 0;
638
}
639
 
1452 palkovsky 640
/** Wait specified time, but in the meantime handle incoming events
641
 *
642
 * @param timeout Time in microseconds to wait
643
 */
644
void async_usleep(suseconds_t timeout)
645
{
646
    amsg_t *msg;
647
 
648
    msg = malloc(sizeof(*msg));
649
    if (!msg)
650
        return;
651
 
652
    msg->ptid = psthread_get_id();
653
    msg->active = 0;
654
    msg->has_timeout = 1;
655
 
656
    gettimeofday(&msg->expires, NULL);
657
    tv_add(&msg->expires, timeout);
658
 
659
    futex_down(&async_futex);
660
    insert_timeout(msg);
661
    /* Leave locked async_futex when entering this function */
662
    psthread_schedule_next_adv(PS_TO_MANAGER);
663
    /* futex is up automatically after psthread_schedule_next...*/
664
    free(msg);
665
}