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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
 
1427 palkovsky 289
    futex_down(&async_futex);
1392 palkovsky 290
 
1500 palkovsky 291
    if (usecs) {
292
        gettimeofday(&PS_connection->wdata.expires, NULL);
293
        tv_add(&PS_connection->wdata.expires, usecs);
294
    } else {
295
        PS_connection->wdata.inlist = 0;
296
    }
1392 palkovsky 297
    /* If nothing in queue, wait until something appears */
1500 palkovsky 298
    while (list_empty(&PS_connection->msg_queue)) {
299
        if (usecs) {
300
            PS_connection->wdata.inlist = 1;
301
            insert_timeout(&PS_connection->wdata);
302
        }
303
        PS_connection->wdata.active = 0;
1392 palkovsky 304
        psthread_schedule_next_adv(PS_TO_MANAGER);
1500 palkovsky 305
        /* Futex is up after getting back from async_manager
306
         * get it again */
307
        futex_down(&async_futex);
308
        if (usecs && PS_connection->wdata.timedout && \
309
            list_empty(&PS_connection->msg_queue)) {
310
            /* If we timed out-> exit */
311
            futex_up(&async_futex);
312
            return 0;
313
        }
1351 palkovsky 314
    }
315
 
1470 palkovsky 316
    msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1392 palkovsky 317
    list_remove(&msg->link);
318
    callid = msg->callid;
319
    *call = msg->call;
320
    free(msg);
321
 
1427 palkovsky 322
    futex_up(&async_futex);
1392 palkovsky 323
    return callid;
1351 palkovsky 324
}
325
 
1404 palkovsky 326
/** Thread function that gets created on new connection
327
 *
328
 * This function is defined as a weak symbol - to be redefined in
329
 * user code.
330
 */
1490 palkovsky 331
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
1392 palkovsky 332
{
1404 palkovsky 333
    ipc_answer_fast(callid, ENOENT, 0, 0);
1392 palkovsky 334
}
1351 palkovsky 335
 
1453 palkovsky 336
/** Function that gets called on interrupt receival
1452 palkovsky 337
 *
338
 * This function is defined as a weak symbol - to be redefined in
339
 * user code.
340
 */
341
void interrupt_received(ipc_call_t *call)
342
{
343
}
344
 
345
 
1404 palkovsky 346
/** Wrapper for client connection thread
347
 *
348
 * When new connection arrives, thread with this function is created.
349
 * It calls client_connection and does final cleanup.
350
 *
351
 * @parameter arg Connection structure pointer
352
 */
1392 palkovsky 353
static int connection_thread(void  *arg)
1351 palkovsky 354
{
1404 palkovsky 355
    unsigned long key;
356
    msg_t *msg;
357
 
1392 palkovsky 358
    /* Setup thread local connection pointer */
359
    PS_connection = (connection_t *)arg;
1470 palkovsky 360
    PS_connection->cthread(PS_connection->callid, &PS_connection->call);
1392 palkovsky 361
 
1404 palkovsky 362
    /* Remove myself from connection hash table */
1427 palkovsky 363
    futex_down(&async_futex);
1470 palkovsky 364
    key = PS_connection->in_phone_hash;
1404 palkovsky 365
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 366
    futex_up(&async_futex);
1404 palkovsky 367
    /* Answer all remaining messages with ehangup */
1470 palkovsky 368
    while (!list_empty(&PS_connection->msg_queue)) {
369
        msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1404 palkovsky 370
        list_remove(&msg->link);
371
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
372
        free(msg);
373
    }
1351 palkovsky 374
}
1392 palkovsky 375
 
376
/** Create new thread for a new connection
377
 *
378
 * Creates new thread for connection, fills in connection
379
 * structures and inserts it into the hash table, so that
380
 * later we can easily do routing of messages to particular
381
 * threads.
1407 palkovsky 382
 *
1452 palkovsky 383
 * @param in_phone_hash Identification of the incoming connection
1407 palkovsky 384
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
385
 * @param call Call data of the opening packet
386
 * @param cthread Thread function that should be called upon
387
 *                opening the connection
388
 * @return New thread id
1392 palkovsky 389
 */
1452 palkovsky 390
pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid,
391
                 ipc_call_t *call,
1407 palkovsky 392
                 void (*cthread)(ipc_callid_t,ipc_call_t *))
1392 palkovsky 393
{
394
    pstid_t ptid;
395
    connection_t *conn;
396
    unsigned long key;
397
 
398
    conn = malloc(sizeof(*conn));
399
    if (!conn) {
400
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 401
        return NULL;
1392 palkovsky 402
    }
1452 palkovsky 403
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 404
    list_initialize(&conn->msg_queue);
405
    conn->callid = callid;
1453 palkovsky 406
    if (call)
407
        conn->call = *call;
1500 palkovsky 408
    conn->wdata.active = 1; /* We will activate it asap */
1407 palkovsky 409
    conn->cthread = cthread;
1500 palkovsky 410
 
411
    conn->wdata.ptid = psthread_create(connection_thread, conn);
412
    if (!conn->wdata.ptid) {
1392 palkovsky 413
        free(conn);
414
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 415
        return NULL;
1392 palkovsky 416
    }
1500 palkovsky 417
    /* Add connection to hash table */
1392 palkovsky 418
    key = conn->in_phone_hash;
1427 palkovsky 419
    futex_down(&async_futex);
1392 palkovsky 420
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 421
    futex_up(&async_futex);
1392 palkovsky 422
 
1500 palkovsky 423
    psthread_add_ready(conn->wdata.ptid);
1407 palkovsky 424
 
1500 palkovsky 425
    return conn->wdata.ptid;
1392 palkovsky 426
}
427
 
1427 palkovsky 428
/** Handle call that was received */
1392 palkovsky 429
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
430
{
1452 palkovsky 431
    /* Unrouted call - do some default behaviour */
1392 palkovsky 432
    switch (IPC_GET_METHOD(*call)) {
433
    case IPC_M_INTERRUPT:
1452 palkovsky 434
        interrupt_received(call);
435
        return;
1392 palkovsky 436
    case IPC_M_CONNECT_ME_TO:
437
        /* Open new connection with thread etc. */
1452 palkovsky 438
        async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
439
        return;
1392 palkovsky 440
    }
1452 palkovsky 441
 
442
    /* Try to route call through connection tables */
443
    if (route_call(callid, call))
444
        return;
445
 
446
    /* Unknown call from unknown phone - hang it up */
447
    ipc_answer_fast(callid, EHANGUP, 0, 0);
1392 palkovsky 448
}
449
 
1441 palkovsky 450
/** Fire all timeouts that expired */
451
static void handle_expired_timeouts(void)
452
{
453
    struct timeval tv;
1500 palkovsky 454
    awaiter_t *waiter;
1441 palkovsky 455
    link_t *cur;
456
 
457
    gettimeofday(&tv,NULL);
458
    futex_down(&async_futex);
459
 
460
    cur = timeout_list.next;
461
    while (cur != &timeout_list) {
1500 palkovsky 462
        waiter = list_get_instance(cur,awaiter_t,link);
463
        if (tv_gt(&waiter->expires, &tv))
1441 palkovsky 464
            break;
465
        cur = cur->next;
1500 palkovsky 466
        list_remove(&waiter->link);
467
        waiter->inlist = 0;
468
        waiter->timedout = 1;
1441 palkovsky 469
        /* Redundant condition? The thread should not
470
         * be active when it gets here.
471
         */
1500 palkovsky 472
        if (!waiter->active) {
473
            waiter->active = 1;
474
            psthread_add_ready(waiter->ptid);
1441 palkovsky 475
        }
476
    }
477
 
478
    futex_up(&async_futex);
479
}
480
 
1392 palkovsky 481
/** Endless loop dispatching incoming calls and answers */
1441 palkovsky 482
int async_manager(void)
1392 palkovsky 483
{
484
    ipc_call_t call;
485
    ipc_callid_t callid;
1435 palkovsky 486
    int timeout;
1500 palkovsky 487
    awaiter_t *waiter;
1441 palkovsky 488
    struct timeval tv;
1392 palkovsky 489
 
490
    while (1) {
491
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
1427 palkovsky 492
            futex_up(&async_futex); /* async_futex is always held
1392 palkovsky 493
                        * when entering manager thread
494
                        */
495
            continue;
496
        }
1441 palkovsky 497
        futex_down(&async_futex);
498
        if (!list_empty(&timeout_list)) {
1500 palkovsky 499
            waiter = list_get_instance(timeout_list.next,awaiter_t,link);
1441 palkovsky 500
            gettimeofday(&tv,NULL);
1500 palkovsky 501
            if (tv_gteq(&tv, &waiter->expires)) {
1441 palkovsky 502
                handle_expired_timeouts();
503
                continue;
504
            } else
1500 palkovsky 505
                timeout = tv_sub(&waiter->expires, &tv);
1441 palkovsky 506
        } else
1435 palkovsky 507
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 508
        futex_up(&async_futex);
509
 
1435 palkovsky 510
        callid = ipc_wait_cycle(&call, timeout, SYNCH_BLOCKING);
1392 palkovsky 511
 
1435 palkovsky 512
        if (!callid) {
1441 palkovsky 513
            handle_expired_timeouts();
1435 palkovsky 514
            continue;
515
        }
516
 
1392 palkovsky 517
        if (callid & IPC_CALLID_ANSWERED)
518
            continue;
1427 palkovsky 519
 
1392 palkovsky 520
        handle_call(callid, &call);
521
    }
522
}
523
 
1404 palkovsky 524
/** Function to start async_manager as a standalone thread
525
 *
526
 * When more kernel threads are used, one async manager should
527
 * exist per thread. The particular implementation may change,
528
 * currently one async_manager is started automatically per kernel
529
 * thread except main thread.
530
 */
1392 palkovsky 531
static int async_manager_thread(void *arg)
532
{
1427 palkovsky 533
    futex_up(&async_futex); /* async_futex is always locked when entering
1392 palkovsky 534
                * manager */
535
    async_manager();
536
}
537
 
538
/** Add one manager to manager list */
539
void async_create_manager(void)
540
{
541
    pstid_t ptid;
542
 
543
    ptid = psthread_create(async_manager_thread, NULL);
544
    psthread_add_manager(ptid);
545
}
546
 
547
/** Remove one manager from manager list */
548
void async_destroy_manager(void)
549
{
550
    psthread_remove_manager();
551
}
552
 
553
/** Initialize internal structures needed for async manager */
554
int _async_init(void)
555
{
1404 palkovsky 556
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
1392 palkovsky 557
        printf("%s: cannot create hash table\n", "async");
558
        return ENOMEM;
559
    }
560
 
561
}
1427 palkovsky 562
 
563
/** IPC handler for messages in async framework
564
 *
565
 * Notify thread that is waiting for this message, that it arrived
566
 */
567
static void reply_received(void *private, int retval,
568
               ipc_call_t *data)
569
{
570
    amsg_t *msg = (amsg_t *) private;
571
 
572
    msg->retval = retval;
573
 
574
    futex_down(&async_futex);
575
    /* Copy data after futex_down, just in case the
576
     * call was detached
577
     */
578
    if (msg->dataptr)
579
        *msg->dataptr = *data;
1435 palkovsky 580
 
1441 palkovsky 581
    write_barrier();
582
    /* Remove message from timeout list */
1500 palkovsky 583
    if (msg->wdata.inlist)
584
        list_remove(&msg->wdata.link);
1427 palkovsky 585
    msg->done = 1;
1500 palkovsky 586
    if (! msg->wdata.active) {
587
        msg->wdata.active = 1;
588
        psthread_add_ready(msg->wdata.ptid);
1427 palkovsky 589
    }
590
    futex_up(&async_futex);
591
}
592
 
593
/** Send message and return id of the sent message
594
 *
595
 * The return value can be used as input for async_wait() to wait
596
 * for completion.
597
 */
598
aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
599
           ipc_call_t *dataptr)
600
{
601
    amsg_t *msg;
602
 
603
    msg = malloc(sizeof(*msg));
604
    msg->done = 0;
605
    msg->dataptr = dataptr;
1500 palkovsky 606
 
607
    msg->wdata.active = 1; /* We may sleep in next method, but it
608
                * will use it's own mechanism */
1427 palkovsky 609
    ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received);
610
 
611
    return (aid_t) msg;
612
}
613
 
614
/** Wait for a message sent by async framework
615
 *
616
 * @param amsgid Message ID to wait for
617
 * @param retval Pointer to variable where will be stored retval
618
 *               of the answered message. If NULL, it is ignored.
619
 *
620
 */
621
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
622
{
623
    amsg_t *msg = (amsg_t *) amsgid;
624
    connection_t *conn;
625
 
626
    futex_down(&async_futex);
627
    if (msg->done) {
628
        futex_up(&async_futex);
629
        goto done;
630
    }
631
 
1500 palkovsky 632
    msg->wdata.ptid = psthread_get_id();
633
    msg->wdata.active = 0;
634
    msg->wdata.inlist = 0;
1427 palkovsky 635
    /* Leave locked async_futex when entering this function */
636
    psthread_schedule_next_adv(PS_TO_MANAGER);
637
    /* futex is up automatically after psthread_schedule_next...*/
638
done:
639
    if (retval)
640
        *retval = msg->retval;
641
    free(msg);
642
}
1435 palkovsky 643
 
1441 palkovsky 644
/** Wait for a message sent by async framework with timeout
645
 *
646
 * @param amsgid Message ID to wait for
647
 * @param retval Pointer to variable where will be stored retval
648
 *               of the answered message. If NULL, it is ignored.
649
 * @param timeout Timeout in usecs
650
 * @return 0 on success, ETIMEOUT if timeout expired
651
 *
652
 */
653
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
654
{
655
    amsg_t *msg = (amsg_t *) amsgid;
656
    connection_t *conn;
1435 palkovsky 657
 
1441 palkovsky 658
    futex_down(&async_futex);
659
    if (msg->done) {
660
        futex_up(&async_futex);
661
        goto done;
662
    }
1435 palkovsky 663
 
1500 palkovsky 664
    gettimeofday(&msg->wdata.expires, NULL);
665
    tv_add(&msg->wdata.expires, timeout);
1435 palkovsky 666
 
1500 palkovsky 667
    msg->wdata.ptid = psthread_get_id();
668
    msg->wdata.active = 0;
669
    msg->wdata.inlist = 1;
1435 palkovsky 670
 
1500 palkovsky 671
    insert_timeout(&msg->wdata);
672
 
1441 palkovsky 673
    /* Leave locked async_futex when entering this function */
674
    psthread_schedule_next_adv(PS_TO_MANAGER);
675
    /* futex is up automatically after psthread_schedule_next...*/
1435 palkovsky 676
 
1441 palkovsky 677
    if (!msg->done)
678
        return ETIMEOUT;
679
 
680
done:
681
    if (retval)
682
        *retval = msg->retval;
683
    free(msg);
684
 
685
    return 0;
686
}
687
 
1452 palkovsky 688
/** Wait specified time, but in the meantime handle incoming events
689
 *
690
 * @param timeout Time in microseconds to wait
691
 */
692
void async_usleep(suseconds_t timeout)
693
{
694
    amsg_t *msg;
695
 
696
    msg = malloc(sizeof(*msg));
697
    if (!msg)
698
        return;
699
 
1500 palkovsky 700
    msg->wdata.ptid = psthread_get_id();
701
    msg->wdata.inlist = 1;
702
    msg->wdata.active = 0;
1452 palkovsky 703
 
1500 palkovsky 704
    gettimeofday(&msg->wdata.expires, NULL);
705
    tv_add(&msg->wdata.expires, timeout);
1452 palkovsky 706
 
707
    futex_down(&async_futex);
1500 palkovsky 708
    insert_timeout(&msg->wdata);
1452 palkovsky 709
    /* Leave locked async_futex when entering this function */
710
    psthread_schedule_next_adv(PS_TO_MANAGER);
711
    /* futex is up automatically after psthread_schedule_next...*/
712
    free(msg);
713
}
1490 palkovsky 714
 
715
/** Set function that is called, IPC_M_CONNECT_ME_TO is received
716
 *
717
 * @param conn Function that will form new psthread.
718
 */
719
void async_set_client_connection(async_client_conn_t conn)
720
{
721
    client_connection = conn;
722
}