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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
 
1463 palkovsky 96
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 {
1500 palkovsky 101
    struct timeval expires;      /**< Expiration time for waiting thread */
102
    int inlist;             /**< If true, this struct is in timeout list */
103
    link_t link;
104
 
1427 palkovsky 105
    pstid_t ptid;                /**< Thread waiting for this message */
106
    int active;                  /**< If this thread is currently active */
1500 palkovsky 107
    int timedout;                /**< If true, we timed out */
108
} awaiter_t;
109
 
110
typedef struct {
111
    awaiter_t wdata;
112
 
1427 palkovsky 113
    int done;                    /**< If reply was received */
114
    ipc_call_t *dataptr;         /**< Pointer where the answer data
1500 palkovsky 115
                      *   is stored */
1427 palkovsky 116
    ipcarg_t retval;
117
} amsg_t;
118
 
119
typedef struct {
1392 palkovsky 120
    link_t link;
121
    ipc_callid_t callid;
122
    ipc_call_t call;
123
} msg_t;
124
 
125
typedef struct {
1500 palkovsky 126
    awaiter_t wdata;
127
 
128
    link_t link;             /**< Hash table link */
129
    ipcarg_t in_phone_hash;  /**< Incoming phone hash. */
130
    link_t msg_queue;        /**< Messages that should be delivered to this thread */
1392 palkovsky 131
    /* Structures for connection opening packet */
132
    ipc_callid_t callid;
133
    ipc_call_t call;
1407 palkovsky 134
    void (*cthread)(ipc_callid_t,ipc_call_t *);
1392 palkovsky 135
} connection_t;
136
 
1490 palkovsky 137
 
1392 palkovsky 138
__thread connection_t *PS_connection;
139
 
1490 palkovsky 140
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call);
141
static async_client_conn_t client_connection = default_client_connection;
142
 
1441 palkovsky 143
/** Add microseconds to give timeval */
144
static void tv_add(struct timeval *tv, suseconds_t usecs)
145
{
146
    tv->tv_sec += usecs / 1000000;
147
    tv->tv_usec += usecs % 1000000;
148
    if (tv->tv_usec > 1000000) {
149
        tv->tv_sec++;
150
        tv->tv_usec -= 1000000;
151
    }
152
}
153
 
154
/** Subtract 2 timevals, return microseconds difference */
155
static suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
156
{
157
    suseconds_t result;
158
 
159
    result = tv1->tv_usec - tv2->tv_usec;
160
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
161
 
162
    return result;
163
}
164
 
165
/** Compare timeval
166
 *
167
 * @return 1 if tv1 > tv2, otherwise 0
168
 */
169
static int tv_gt(struct timeval *tv1, struct timeval *tv2)
170
{
171
    if (tv1->tv_sec > tv2->tv_sec)
172
        return 1;
173
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
174
        return 1;
175
    return 0;
176
}
1466 palkovsky 177
static int tv_gteq(struct timeval *tv1, struct timeval *tv2)
178
{
179
    if (tv1->tv_sec > tv2->tv_sec)
180
        return 1;
181
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
182
        return 1;
183
    return 0;
184
}
1441 palkovsky 185
 
1392 palkovsky 186
/* Hash table functions */
1404 palkovsky 187
#define CONN_HASH_TABLE_CHAINS  32
1392 palkovsky 188
 
189
static hash_index_t conn_hash(unsigned long *key)
1351 palkovsky 190
{
1392 palkovsky 191
    assert(key);
1404 palkovsky 192
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
1351 palkovsky 193
}
194
 
1392 palkovsky 195
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
1351 palkovsky 196
{
1392 palkovsky 197
    connection_t *hs;
198
 
199
    hs = hash_table_get_instance(item, connection_t, link);
200
 
201
    return key[0] == hs->in_phone_hash;
1351 palkovsky 202
}
203
 
1392 palkovsky 204
static void conn_remove(link_t *item)
1351 palkovsky 205
{
1392 palkovsky 206
    free(hash_table_get_instance(item, connection_t, link));
1351 palkovsky 207
}
208
 
1392 palkovsky 209
 
210
/** Operations for NS hash table. */
211
static hash_table_operations_t conn_hash_table_ops = {
212
    .hash = conn_hash,
213
    .compare = conn_compare,
214
    .remove_callback = conn_remove
215
};
216
 
1500 palkovsky 217
/** Insert sort timeout msg into timeouts list
218
 *
219
 * Assume async_futex is held
220
 */
221
static void insert_timeout(awaiter_t *wd)
222
{
223
    link_t *tmp;
224
    awaiter_t *cur;
225
 
226
    wd->timedout = 0;
227
 
228
    tmp = timeout_list.next;
229
    while (tmp != &timeout_list) {
230
        cur = list_get_instance(tmp, awaiter_t, link);
231
        if (tv_gteq(&cur->expires, &wd->expires))
232
            break;
233
        tmp = tmp->next;
234
    }
235
    list_append(&wd->link, tmp);
236
}
237
 
1427 palkovsky 238
/*************************************************/
239
 
1392 palkovsky 240
/** Try to route a call to an appropriate connection thread
241
 *
242
 */
243
static int route_call(ipc_callid_t callid, ipc_call_t *call)
1351 palkovsky 244
{
1392 palkovsky 245
    connection_t *conn;
246
    msg_t *msg;
247
    link_t *hlp;
248
    unsigned long key;
249
 
1427 palkovsky 250
    futex_down(&async_futex);
1392 palkovsky 251
 
252
    key = call->in_phone_hash;
253
    hlp = hash_table_find(&conn_hash_table, &key);
254
    if (!hlp) {
1427 palkovsky 255
        futex_up(&async_futex);
1392 palkovsky 256
        return 0;
1351 palkovsky 257
    }
1392 palkovsky 258
    conn = hash_table_get_instance(hlp, connection_t, link);
1351 palkovsky 259
 
1392 palkovsky 260
    msg = malloc(sizeof(*msg));
261
    msg->callid = callid;
262
    msg->call = *call;
263
    list_append(&msg->link, &conn->msg_queue);
264
 
1500 palkovsky 265
    /* If the call is waiting for event, run it */
266
    if (!conn->wdata.active) {
267
        /* If in timeout list, remove it */
268
        if (conn->wdata.inlist) {
269
            conn->wdata.inlist = 0;
270
            list_remove(&conn->wdata.link);
271
        }
272
        conn->wdata.active = 1;
273
        psthread_add_ready(conn->wdata.ptid);
1392 palkovsky 274
    }
1351 palkovsky 275
 
1427 palkovsky 276
    futex_up(&async_futex);
1392 palkovsky 277
 
278
    return 1;
279
}
280
 
1404 palkovsky 281
/** Return new incoming message for current(thread-local) connection */
1500 palkovsky 282
ipc_callid_t async_get_call_timeout(ipc_call_t *call, suseconds_t usecs)
1392 palkovsky 283
{
284
    msg_t *msg;
285
    ipc_callid_t callid;
286
 
1466 palkovsky 287
    assert(PS_connection);
288
 
1532 palkovsky 289
    if (usecs < 0) /* TODO: let it get through the ipc_call once */
290
        return 0;
291
 
1427 palkovsky 292
    futex_down(&async_futex);
1392 palkovsky 293
 
1500 palkovsky 294
    if (usecs) {
295
        gettimeofday(&PS_connection->wdata.expires, NULL);
296
        tv_add(&PS_connection->wdata.expires, usecs);
297
    } else {
298
        PS_connection->wdata.inlist = 0;
299
    }
1392 palkovsky 300
    /* If nothing in queue, wait until something appears */
1500 palkovsky 301
    while (list_empty(&PS_connection->msg_queue)) {
302
        if (usecs) {
303
            PS_connection->wdata.inlist = 1;
304
            insert_timeout(&PS_connection->wdata);
305
        }
306
        PS_connection->wdata.active = 0;
1392 palkovsky 307
        psthread_schedule_next_adv(PS_TO_MANAGER);
1500 palkovsky 308
        /* Futex is up after getting back from async_manager
309
         * get it again */
310
        futex_down(&async_futex);
311
        if (usecs && PS_connection->wdata.timedout && \
312
            list_empty(&PS_connection->msg_queue)) {
313
            /* If we timed out-> exit */
314
            futex_up(&async_futex);
315
            return 0;
316
        }
1351 palkovsky 317
    }
318
 
1470 palkovsky 319
    msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1392 palkovsky 320
    list_remove(&msg->link);
321
    callid = msg->callid;
322
    *call = msg->call;
323
    free(msg);
324
 
1427 palkovsky 325
    futex_up(&async_futex);
1392 palkovsky 326
    return callid;
1351 palkovsky 327
}
328
 
1404 palkovsky 329
/** Thread function that gets created on new connection
330
 *
331
 * This function is defined as a weak symbol - to be redefined in
332
 * user code.
333
 */
1490 palkovsky 334
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
1392 palkovsky 335
{
1404 palkovsky 336
    ipc_answer_fast(callid, ENOENT, 0, 0);
1392 palkovsky 337
}
1351 palkovsky 338
 
1453 palkovsky 339
/** Function that gets called on interrupt receival
1452 palkovsky 340
 *
341
 * This function is defined as a weak symbol - to be redefined in
342
 * user code.
343
 */
344
void interrupt_received(ipc_call_t *call)
345
{
346
}
347
 
348
 
1404 palkovsky 349
/** Wrapper for client connection thread
350
 *
351
 * When new connection arrives, thread with this function is created.
352
 * It calls client_connection and does final cleanup.
353
 *
354
 * @parameter arg Connection structure pointer
355
 */
1392 palkovsky 356
static int connection_thread(void  *arg)
1351 palkovsky 357
{
1404 palkovsky 358
    unsigned long key;
359
    msg_t *msg;
360
 
1392 palkovsky 361
    /* Setup thread local connection pointer */
362
    PS_connection = (connection_t *)arg;
1470 palkovsky 363
    PS_connection->cthread(PS_connection->callid, &PS_connection->call);
1392 palkovsky 364
 
1404 palkovsky 365
    /* Remove myself from connection hash table */
1427 palkovsky 366
    futex_down(&async_futex);
1470 palkovsky 367
    key = PS_connection->in_phone_hash;
1404 palkovsky 368
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 369
    futex_up(&async_futex);
1404 palkovsky 370
    /* Answer all remaining messages with ehangup */
1470 palkovsky 371
    while (!list_empty(&PS_connection->msg_queue)) {
372
        msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1404 palkovsky 373
        list_remove(&msg->link);
374
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
375
        free(msg);
376
    }
1351 palkovsky 377
}
1392 palkovsky 378
 
379
/** Create new thread for a new connection
380
 *
381
 * Creates new thread for connection, fills in connection
382
 * structures and inserts it into the hash table, so that
383
 * later we can easily do routing of messages to particular
384
 * threads.
1407 palkovsky 385
 *
1452 palkovsky 386
 * @param in_phone_hash Identification of the incoming connection
1407 palkovsky 387
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
388
 * @param call Call data of the opening packet
389
 * @param cthread Thread function that should be called upon
390
 *                opening the connection
391
 * @return New thread id
1392 palkovsky 392
 */
1452 palkovsky 393
pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid,
394
                 ipc_call_t *call,
1407 palkovsky 395
                 void (*cthread)(ipc_callid_t,ipc_call_t *))
1392 palkovsky 396
{
397
    pstid_t ptid;
398
    connection_t *conn;
399
    unsigned long key;
400
 
401
    conn = malloc(sizeof(*conn));
402
    if (!conn) {
403
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 404
        return NULL;
1392 palkovsky 405
    }
1452 palkovsky 406
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 407
    list_initialize(&conn->msg_queue);
408
    conn->callid = callid;
1453 palkovsky 409
    if (call)
410
        conn->call = *call;
1500 palkovsky 411
    conn->wdata.active = 1; /* We will activate it asap */
1407 palkovsky 412
    conn->cthread = cthread;
1500 palkovsky 413
 
414
    conn->wdata.ptid = psthread_create(connection_thread, conn);
415
    if (!conn->wdata.ptid) {
1392 palkovsky 416
        free(conn);
417
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 418
        return NULL;
1392 palkovsky 419
    }
1500 palkovsky 420
    /* Add connection to hash table */
1392 palkovsky 421
    key = conn->in_phone_hash;
1427 palkovsky 422
    futex_down(&async_futex);
1392 palkovsky 423
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 424
    futex_up(&async_futex);
1392 palkovsky 425
 
1500 palkovsky 426
    psthread_add_ready(conn->wdata.ptid);
1407 palkovsky 427
 
1500 palkovsky 428
    return conn->wdata.ptid;
1392 palkovsky 429
}
430
 
1427 palkovsky 431
/** Handle call that was received */
1392 palkovsky 432
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
433
{
1452 palkovsky 434
    /* Unrouted call - do some default behaviour */
1392 palkovsky 435
    switch (IPC_GET_METHOD(*call)) {
436
    case IPC_M_INTERRUPT:
1452 palkovsky 437
        interrupt_received(call);
438
        return;
1392 palkovsky 439
    case IPC_M_CONNECT_ME_TO:
440
        /* Open new connection with thread etc. */
1452 palkovsky 441
        async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
442
        return;
1392 palkovsky 443
    }
1452 palkovsky 444
 
445
    /* Try to route call through connection tables */
446
    if (route_call(callid, call))
447
        return;
448
 
449
    /* Unknown call from unknown phone - hang it up */
450
    ipc_answer_fast(callid, EHANGUP, 0, 0);
1392 palkovsky 451
}
452
 
1441 palkovsky 453
/** Fire all timeouts that expired */
454
static void handle_expired_timeouts(void)
455
{
456
    struct timeval tv;
1500 palkovsky 457
    awaiter_t *waiter;
1441 palkovsky 458
    link_t *cur;
459
 
460
    gettimeofday(&tv,NULL);
461
    futex_down(&async_futex);
462
 
463
    cur = timeout_list.next;
464
    while (cur != &timeout_list) {
1500 palkovsky 465
        waiter = list_get_instance(cur,awaiter_t,link);
466
        if (tv_gt(&waiter->expires, &tv))
1441 palkovsky 467
            break;
468
        cur = cur->next;
1500 palkovsky 469
        list_remove(&waiter->link);
470
        waiter->inlist = 0;
471
        waiter->timedout = 1;
1441 palkovsky 472
        /* Redundant condition? The thread should not
473
         * be active when it gets here.
474
         */
1500 palkovsky 475
        if (!waiter->active) {
476
            waiter->active = 1;
477
            psthread_add_ready(waiter->ptid);
1441 palkovsky 478
        }
479
    }
480
 
481
    futex_up(&async_futex);
482
}
483
 
1392 palkovsky 484
/** Endless loop dispatching incoming calls and answers */
1441 palkovsky 485
int async_manager(void)
1392 palkovsky 486
{
487
    ipc_call_t call;
488
    ipc_callid_t callid;
1435 palkovsky 489
    int timeout;
1500 palkovsky 490
    awaiter_t *waiter;
1441 palkovsky 491
    struct timeval tv;
1392 palkovsky 492
 
493
    while (1) {
494
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
1427 palkovsky 495
            futex_up(&async_futex); /* async_futex is always held
1392 palkovsky 496
                        * when entering manager thread
497
                        */
498
            continue;
499
        }
1441 palkovsky 500
        futex_down(&async_futex);
501
        if (!list_empty(&timeout_list)) {
1500 palkovsky 502
            waiter = list_get_instance(timeout_list.next,awaiter_t,link);
1441 palkovsky 503
            gettimeofday(&tv,NULL);
1500 palkovsky 504
            if (tv_gteq(&tv, &waiter->expires)) {
1441 palkovsky 505
                handle_expired_timeouts();
506
                continue;
507
            } else
1500 palkovsky 508
                timeout = tv_sub(&waiter->expires, &tv);
1441 palkovsky 509
        } else
1435 palkovsky 510
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 511
        futex_up(&async_futex);
512
 
1503 jermar 513
        callid = ipc_wait_cycle(&call, timeout, SYNCH_FLAGS_NONE);
1392 palkovsky 514
 
1435 palkovsky 515
        if (!callid) {
1441 palkovsky 516
            handle_expired_timeouts();
1435 palkovsky 517
            continue;
518
        }
519
 
1392 palkovsky 520
        if (callid & IPC_CALLID_ANSWERED)
521
            continue;
1427 palkovsky 522
 
1392 palkovsky 523
        handle_call(callid, &call);
524
    }
525
}
526
 
1404 palkovsky 527
/** Function to start async_manager as a standalone thread
528
 *
529
 * When more kernel threads are used, one async manager should
530
 * exist per thread. The particular implementation may change,
531
 * currently one async_manager is started automatically per kernel
532
 * thread except main thread.
533
 */
1392 palkovsky 534
static int async_manager_thread(void *arg)
535
{
1427 palkovsky 536
    futex_up(&async_futex); /* async_futex is always locked when entering
1392 palkovsky 537
                * manager */
538
    async_manager();
539
}
540
 
541
/** Add one manager to manager list */
542
void async_create_manager(void)
543
{
544
    pstid_t ptid;
545
 
546
    ptid = psthread_create(async_manager_thread, NULL);
547
    psthread_add_manager(ptid);
548
}
549
 
550
/** Remove one manager from manager list */
551
void async_destroy_manager(void)
552
{
553
    psthread_remove_manager();
554
}
555
 
556
/** Initialize internal structures needed for async manager */
557
int _async_init(void)
558
{
1404 palkovsky 559
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
1392 palkovsky 560
        printf("%s: cannot create hash table\n", "async");
561
        return ENOMEM;
562
    }
563
 
564
}
1427 palkovsky 565
 
566
/** IPC handler for messages in async framework
567
 *
568
 * Notify thread that is waiting for this message, that it arrived
569
 */
570
static void reply_received(void *private, int retval,
571
               ipc_call_t *data)
572
{
573
    amsg_t *msg = (amsg_t *) private;
574
 
575
    msg->retval = retval;
576
 
577
    futex_down(&async_futex);
578
    /* Copy data after futex_down, just in case the
579
     * call was detached
580
     */
581
    if (msg->dataptr)
582
        *msg->dataptr = *data;
1435 palkovsky 583
 
1441 palkovsky 584
    write_barrier();
585
    /* Remove message from timeout list */
1500 palkovsky 586
    if (msg->wdata.inlist)
587
        list_remove(&msg->wdata.link);
1427 palkovsky 588
    msg->done = 1;
1500 palkovsky 589
    if (! msg->wdata.active) {
590
        msg->wdata.active = 1;
591
        psthread_add_ready(msg->wdata.ptid);
1427 palkovsky 592
    }
593
    futex_up(&async_futex);
594
}
595
 
596
/** Send message and return id of the sent message
597
 *
598
 * The return value can be used as input for async_wait() to wait
599
 * for completion.
600
 */
601
aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
602
           ipc_call_t *dataptr)
603
{
604
    amsg_t *msg;
605
 
606
    msg = malloc(sizeof(*msg));
607
    msg->done = 0;
608
    msg->dataptr = dataptr;
1500 palkovsky 609
 
610
    msg->wdata.active = 1; /* We may sleep in next method, but it
611
                * will use it's own mechanism */
1518 palkovsky 612
    ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received,1);
1427 palkovsky 613
 
614
    return (aid_t) msg;
615
}
616
 
617
/** Wait for a message sent by async framework
618
 *
619
 * @param amsgid Message ID to wait for
620
 * @param retval Pointer to variable where will be stored retval
621
 *               of the answered message. If NULL, it is ignored.
622
 *
623
 */
624
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
625
{
626
    amsg_t *msg = (amsg_t *) amsgid;
627
    connection_t *conn;
628
 
629
    futex_down(&async_futex);
630
    if (msg->done) {
631
        futex_up(&async_futex);
632
        goto done;
633
    }
634
 
1500 palkovsky 635
    msg->wdata.ptid = psthread_get_id();
636
    msg->wdata.active = 0;
637
    msg->wdata.inlist = 0;
1427 palkovsky 638
    /* Leave locked async_futex when entering this function */
639
    psthread_schedule_next_adv(PS_TO_MANAGER);
640
    /* futex is up automatically after psthread_schedule_next...*/
641
done:
642
    if (retval)
643
        *retval = msg->retval;
644
    free(msg);
645
}
1435 palkovsky 646
 
1441 palkovsky 647
/** Wait for a message sent by async framework with timeout
648
 *
649
 * @param amsgid Message ID to wait for
650
 * @param retval Pointer to variable where will be stored retval
651
 *               of the answered message. If NULL, it is ignored.
652
 * @param timeout Timeout in usecs
653
 * @return 0 on success, ETIMEOUT if timeout expired
654
 *
655
 */
656
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
657
{
658
    amsg_t *msg = (amsg_t *) amsgid;
659
    connection_t *conn;
1435 palkovsky 660
 
1532 palkovsky 661
    /* TODO: Let it go through the event read at least once */
662
    if (timeout < 0)
663
        return ETIMEOUT;
664
 
1441 palkovsky 665
    futex_down(&async_futex);
666
    if (msg->done) {
667
        futex_up(&async_futex);
668
        goto done;
669
    }
1435 palkovsky 670
 
1500 palkovsky 671
    gettimeofday(&msg->wdata.expires, NULL);
672
    tv_add(&msg->wdata.expires, timeout);
1435 palkovsky 673
 
1500 palkovsky 674
    msg->wdata.ptid = psthread_get_id();
675
    msg->wdata.active = 0;
676
    msg->wdata.inlist = 1;
1435 palkovsky 677
 
1500 palkovsky 678
    insert_timeout(&msg->wdata);
679
 
1441 palkovsky 680
    /* Leave locked async_futex when entering this function */
681
    psthread_schedule_next_adv(PS_TO_MANAGER);
682
    /* futex is up automatically after psthread_schedule_next...*/
1435 palkovsky 683
 
1441 palkovsky 684
    if (!msg->done)
685
        return ETIMEOUT;
686
 
687
done:
688
    if (retval)
689
        *retval = msg->retval;
690
    free(msg);
691
 
692
    return 0;
693
}
694
 
1452 palkovsky 695
/** Wait specified time, but in the meantime handle incoming events
696
 *
697
 * @param timeout Time in microseconds to wait
698
 */
699
void async_usleep(suseconds_t timeout)
700
{
701
    amsg_t *msg;
702
 
703
    msg = malloc(sizeof(*msg));
704
    if (!msg)
705
        return;
706
 
1500 palkovsky 707
    msg->wdata.ptid = psthread_get_id();
708
    msg->wdata.inlist = 1;
709
    msg->wdata.active = 0;
1452 palkovsky 710
 
1500 palkovsky 711
    gettimeofday(&msg->wdata.expires, NULL);
712
    tv_add(&msg->wdata.expires, timeout);
1452 palkovsky 713
 
714
    futex_down(&async_futex);
1500 palkovsky 715
    insert_timeout(&msg->wdata);
1452 palkovsky 716
    /* Leave locked async_futex when entering this function */
717
    psthread_schedule_next_adv(PS_TO_MANAGER);
718
    /* futex is up automatically after psthread_schedule_next...*/
719
    free(msg);
720
}
1490 palkovsky 721
 
722
/** Set function that is called, IPC_M_CONNECT_ME_TO is received
723
 *
724
 * @param conn Function that will form new psthread.
725
 */
726
void async_set_client_connection(async_client_conn_t conn)
727
{
728
    client_connection = conn;
729
}