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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);
1596 palkovsky 141
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call);
1490 palkovsky 142
static async_client_conn_t client_connection = default_client_connection;
1596 palkovsky 143
static async_client_conn_t interrupt_received = default_interrupt_received;
1490 palkovsky 144
 
1441 palkovsky 145
/** Add microseconds to give timeval */
146
static void tv_add(struct timeval *tv, suseconds_t usecs)
147
{
148
    tv->tv_sec += usecs / 1000000;
149
    tv->tv_usec += usecs % 1000000;
150
    if (tv->tv_usec > 1000000) {
151
        tv->tv_sec++;
152
        tv->tv_usec -= 1000000;
153
    }
154
}
155
 
156
/** Subtract 2 timevals, return microseconds difference */
157
static suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
158
{
159
    suseconds_t result;
160
 
161
    result = tv1->tv_usec - tv2->tv_usec;
162
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
163
 
164
    return result;
165
}
166
 
167
/** Compare timeval
168
 *
169
 * @return 1 if tv1 > tv2, otherwise 0
170
 */
171
static int tv_gt(struct timeval *tv1, struct timeval *tv2)
172
{
173
    if (tv1->tv_sec > tv2->tv_sec)
174
        return 1;
175
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
176
        return 1;
177
    return 0;
178
}
1466 palkovsky 179
static int tv_gteq(struct timeval *tv1, struct timeval *tv2)
180
{
181
    if (tv1->tv_sec > tv2->tv_sec)
182
        return 1;
183
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
184
        return 1;
185
    return 0;
186
}
1441 palkovsky 187
 
1392 palkovsky 188
/* Hash table functions */
1404 palkovsky 189
#define CONN_HASH_TABLE_CHAINS  32
1392 palkovsky 190
 
191
static hash_index_t conn_hash(unsigned long *key)
1351 palkovsky 192
{
1392 palkovsky 193
    assert(key);
1404 palkovsky 194
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
1351 palkovsky 195
}
196
 
1392 palkovsky 197
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
1351 palkovsky 198
{
1392 palkovsky 199
    connection_t *hs;
200
 
201
    hs = hash_table_get_instance(item, connection_t, link);
202
 
203
    return key[0] == hs->in_phone_hash;
1351 palkovsky 204
}
205
 
1392 palkovsky 206
static void conn_remove(link_t *item)
1351 palkovsky 207
{
1392 palkovsky 208
    free(hash_table_get_instance(item, connection_t, link));
1351 palkovsky 209
}
210
 
1392 palkovsky 211
 
212
/** Operations for NS hash table. */
213
static hash_table_operations_t conn_hash_table_ops = {
214
    .hash = conn_hash,
215
    .compare = conn_compare,
216
    .remove_callback = conn_remove
217
};
218
 
1500 palkovsky 219
/** Insert sort timeout msg into timeouts list
220
 *
221
 */
222
static void insert_timeout(awaiter_t *wd)
223
{
224
    link_t *tmp;
225
    awaiter_t *cur;
226
 
227
    wd->timedout = 0;
228
 
229
    tmp = timeout_list.next;
230
    while (tmp != &timeout_list) {
231
        cur = list_get_instance(tmp, awaiter_t, link);
232
        if (tv_gteq(&cur->expires, &wd->expires))
233
            break;
234
        tmp = tmp->next;
235
    }
236
    list_append(&wd->link, tmp);
237
}
238
 
1427 palkovsky 239
/*************************************************/
240
 
1392 palkovsky 241
/** Try to route a call to an appropriate connection thread
242
 *
243
 */
244
static int route_call(ipc_callid_t callid, ipc_call_t *call)
1351 palkovsky 245
{
1392 palkovsky 246
    connection_t *conn;
247
    msg_t *msg;
248
    link_t *hlp;
249
    unsigned long key;
250
 
1427 palkovsky 251
    futex_down(&async_futex);
1392 palkovsky 252
 
253
    key = call->in_phone_hash;
254
    hlp = hash_table_find(&conn_hash_table, &key);
255
    if (!hlp) {
1427 palkovsky 256
        futex_up(&async_futex);
1392 palkovsky 257
        return 0;
1351 palkovsky 258
    }
1392 palkovsky 259
    conn = hash_table_get_instance(hlp, connection_t, link);
1351 palkovsky 260
 
1392 palkovsky 261
    msg = malloc(sizeof(*msg));
262
    msg->callid = callid;
263
    msg->call = *call;
264
    list_append(&msg->link, &conn->msg_queue);
265
 
1500 palkovsky 266
    /* If the call is waiting for event, run it */
267
    if (!conn->wdata.active) {
268
        /* If in timeout list, remove it */
269
        if (conn->wdata.inlist) {
270
            conn->wdata.inlist = 0;
271
            list_remove(&conn->wdata.link);
272
        }
273
        conn->wdata.active = 1;
274
        psthread_add_ready(conn->wdata.ptid);
1392 palkovsky 275
    }
1351 palkovsky 276
 
1427 palkovsky 277
    futex_up(&async_futex);
1392 palkovsky 278
 
279
    return 1;
280
}
281
 
1404 palkovsky 282
/** Return new incoming message for current(thread-local) connection */
1500 palkovsky 283
ipc_callid_t async_get_call_timeout(ipc_call_t *call, suseconds_t usecs)
1392 palkovsky 284
{
285
    msg_t *msg;
286
    ipc_callid_t callid;
1536 palkovsky 287
    connection_t *conn;
1392 palkovsky 288
 
1466 palkovsky 289
    assert(PS_connection);
1536 palkovsky 290
    /* GCC 4.1.0 coughs on PS_connection-> dereference,
291
     * GCC 4.1.1 happilly puts the rdhwr instruction in delay slot.
292
     *           I would never expect to find so many errors in
293
     *           compiler *($&$(*&$
294
     */
295
    conn = PS_connection;
1466 palkovsky 296
 
1532 palkovsky 297
    if (usecs < 0) /* TODO: let it get through the ipc_call once */
298
        return 0;
299
 
1427 palkovsky 300
    futex_down(&async_futex);
1392 palkovsky 301
 
1500 palkovsky 302
    if (usecs) {
1536 palkovsky 303
        gettimeofday(&conn->wdata.expires, NULL);
304
        tv_add(&conn->wdata.expires, usecs);
1500 palkovsky 305
    } else {
1536 palkovsky 306
        conn->wdata.inlist = 0;
1500 palkovsky 307
    }
1392 palkovsky 308
    /* If nothing in queue, wait until something appears */
1536 palkovsky 309
    while (list_empty(&conn->msg_queue)) {
1500 palkovsky 310
        if (usecs) {
1536 palkovsky 311
            conn->wdata.inlist = 1;
312
            insert_timeout(&conn->wdata);
1500 palkovsky 313
        }
1536 palkovsky 314
        conn->wdata.active = 0;
1392 palkovsky 315
        psthread_schedule_next_adv(PS_TO_MANAGER);
1500 palkovsky 316
        /* Futex is up after getting back from async_manager
317
         * get it again */
318
        futex_down(&async_futex);
1536 palkovsky 319
        if (usecs && conn->wdata.timedout && \
320
            list_empty(&conn->msg_queue)) {
1500 palkovsky 321
            /* If we timed out-> exit */
322
            futex_up(&async_futex);
323
            return 0;
324
        }
1351 palkovsky 325
    }
326
 
1536 palkovsky 327
    msg = list_get_instance(conn->msg_queue.next, msg_t, link);
1392 palkovsky 328
    list_remove(&msg->link);
329
    callid = msg->callid;
330
    *call = msg->call;
331
    free(msg);
332
 
1427 palkovsky 333
    futex_up(&async_futex);
1392 palkovsky 334
    return callid;
1351 palkovsky 335
}
336
 
1404 palkovsky 337
/** Thread function that gets created on new connection
338
 *
339
 * This function is defined as a weak symbol - to be redefined in
340
 * user code.
341
 */
1490 palkovsky 342
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
1392 palkovsky 343
{
1404 palkovsky 344
    ipc_answer_fast(callid, ENOENT, 0, 0);
1392 palkovsky 345
}
1596 palkovsky 346
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call)
1452 palkovsky 347
{
348
}
349
 
1404 palkovsky 350
/** Wrapper for client connection thread
351
 *
352
 * When new connection arrives, thread with this function is created.
353
 * It calls client_connection and does final cleanup.
354
 *
355
 * @parameter arg Connection structure pointer
356
 */
1392 palkovsky 357
static int connection_thread(void  *arg)
1351 palkovsky 358
{
1404 palkovsky 359
    unsigned long key;
360
    msg_t *msg;
361
 
1392 palkovsky 362
    /* Setup thread local connection pointer */
363
    PS_connection = (connection_t *)arg;
1470 palkovsky 364
    PS_connection->cthread(PS_connection->callid, &PS_connection->call);
1392 palkovsky 365
 
1404 palkovsky 366
    /* Remove myself from connection hash table */
1427 palkovsky 367
    futex_down(&async_futex);
1470 palkovsky 368
    key = PS_connection->in_phone_hash;
1404 palkovsky 369
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 370
    futex_up(&async_futex);
1404 palkovsky 371
    /* Answer all remaining messages with ehangup */
1470 palkovsky 372
    while (!list_empty(&PS_connection->msg_queue)) {
373
        msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1404 palkovsky 374
        list_remove(&msg->link);
375
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
376
        free(msg);
377
    }
1351 palkovsky 378
}
1392 palkovsky 379
 
380
/** Create new thread for a new connection
381
 *
382
 * Creates new thread for connection, fills in connection
383
 * structures and inserts it into the hash table, so that
384
 * later we can easily do routing of messages to particular
385
 * threads.
1407 palkovsky 386
 *
1452 palkovsky 387
 * @param in_phone_hash Identification of the incoming connection
1407 palkovsky 388
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
389
 * @param call Call data of the opening packet
390
 * @param cthread Thread function that should be called upon
391
 *                opening the connection
392
 * @return New thread id
1392 palkovsky 393
 */
1452 palkovsky 394
pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid,
395
                 ipc_call_t *call,
1407 palkovsky 396
                 void (*cthread)(ipc_callid_t,ipc_call_t *))
1392 palkovsky 397
{
398
    pstid_t ptid;
399
    connection_t *conn;
400
    unsigned long key;
401
 
402
    conn = malloc(sizeof(*conn));
403
    if (!conn) {
404
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 405
        return NULL;
1392 palkovsky 406
    }
1452 palkovsky 407
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 408
    list_initialize(&conn->msg_queue);
409
    conn->callid = callid;
1453 palkovsky 410
    if (call)
411
        conn->call = *call;
1500 palkovsky 412
    conn->wdata.active = 1; /* We will activate it asap */
1407 palkovsky 413
    conn->cthread = cthread;
1500 palkovsky 414
 
415
    conn->wdata.ptid = psthread_create(connection_thread, conn);
416
    if (!conn->wdata.ptid) {
1392 palkovsky 417
        free(conn);
418
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 419
        return NULL;
1392 palkovsky 420
    }
1500 palkovsky 421
    /* Add connection to hash table */
1392 palkovsky 422
    key = conn->in_phone_hash;
1427 palkovsky 423
    futex_down(&async_futex);
1392 palkovsky 424
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 425
    futex_up(&async_futex);
1392 palkovsky 426
 
1500 palkovsky 427
    psthread_add_ready(conn->wdata.ptid);
1407 palkovsky 428
 
1500 palkovsky 429
    return conn->wdata.ptid;
1392 palkovsky 430
}
431
 
1427 palkovsky 432
/** Handle call that was received */
1392 palkovsky 433
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
434
{
1452 palkovsky 435
    /* Unrouted call - do some default behaviour */
1392 palkovsky 436
    switch (IPC_GET_METHOD(*call)) {
437
    case IPC_M_INTERRUPT:
1596 palkovsky 438
        (*interrupt_received)(callid,call);
1452 palkovsky 439
        return;
1392 palkovsky 440
    case IPC_M_CONNECT_ME_TO:
441
        /* Open new connection with thread etc. */
1452 palkovsky 442
        async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
443
        return;
1392 palkovsky 444
    }
1452 palkovsky 445
 
446
    /* Try to route call through connection tables */
447
    if (route_call(callid, call))
448
        return;
449
 
450
    /* Unknown call from unknown phone - hang it up */
451
    ipc_answer_fast(callid, EHANGUP, 0, 0);
1392 palkovsky 452
}
453
 
1536 palkovsky 454
/** Fire all timeouts that expired
455
 *
456
 */
1441 palkovsky 457
static void handle_expired_timeouts(void)
458
{
459
    struct timeval tv;
1500 palkovsky 460
    awaiter_t *waiter;
1441 palkovsky 461
    link_t *cur;
462
 
463
    gettimeofday(&tv,NULL);
464
    futex_down(&async_futex);
465
 
466
    cur = timeout_list.next;
467
    while (cur != &timeout_list) {
1500 palkovsky 468
        waiter = list_get_instance(cur,awaiter_t,link);
469
        if (tv_gt(&waiter->expires, &tv))
1441 palkovsky 470
            break;
471
        cur = cur->next;
1500 palkovsky 472
        list_remove(&waiter->link);
473
        waiter->inlist = 0;
474
        waiter->timedout = 1;
1441 palkovsky 475
        /* Redundant condition? The thread should not
476
         * be active when it gets here.
477
         */
1500 palkovsky 478
        if (!waiter->active) {
479
            waiter->active = 1;
480
            psthread_add_ready(waiter->ptid);
1441 palkovsky 481
        }
482
    }
483
 
484
    futex_up(&async_futex);
485
}
486
 
1392 palkovsky 487
/** Endless loop dispatching incoming calls and answers */
1441 palkovsky 488
int async_manager(void)
1392 palkovsky 489
{
490
    ipc_call_t call;
491
    ipc_callid_t callid;
1435 palkovsky 492
    int timeout;
1500 palkovsky 493
    awaiter_t *waiter;
1441 palkovsky 494
    struct timeval tv;
1392 palkovsky 495
 
496
    while (1) {
497
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
1427 palkovsky 498
            futex_up(&async_futex); /* async_futex is always held
1392 palkovsky 499
                        * when entering manager thread
500
                        */
501
            continue;
502
        }
1441 palkovsky 503
        futex_down(&async_futex);
504
        if (!list_empty(&timeout_list)) {
1500 palkovsky 505
            waiter = list_get_instance(timeout_list.next,awaiter_t,link);
1441 palkovsky 506
            gettimeofday(&tv,NULL);
1500 palkovsky 507
            if (tv_gteq(&tv, &waiter->expires)) {
1536 palkovsky 508
                futex_up(&async_futex);
1441 palkovsky 509
                handle_expired_timeouts();
510
                continue;
511
            } else
1500 palkovsky 512
                timeout = tv_sub(&waiter->expires, &tv);
1441 palkovsky 513
        } else
1435 palkovsky 514
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 515
        futex_up(&async_futex);
516
 
1503 jermar 517
        callid = ipc_wait_cycle(&call, timeout, SYNCH_FLAGS_NONE);
1392 palkovsky 518
 
1435 palkovsky 519
        if (!callid) {
1441 palkovsky 520
            handle_expired_timeouts();
1435 palkovsky 521
            continue;
522
        }
523
 
1392 palkovsky 524
        if (callid & IPC_CALLID_ANSWERED)
525
            continue;
1427 palkovsky 526
 
1392 palkovsky 527
        handle_call(callid, &call);
528
    }
529
}
530
 
1404 palkovsky 531
/** Function to start async_manager as a standalone thread
532
 *
533
 * When more kernel threads are used, one async manager should
534
 * exist per thread. The particular implementation may change,
535
 * currently one async_manager is started automatically per kernel
536
 * thread except main thread.
537
 */
1392 palkovsky 538
static int async_manager_thread(void *arg)
539
{
1427 palkovsky 540
    futex_up(&async_futex); /* async_futex is always locked when entering
1392 palkovsky 541
                * manager */
542
    async_manager();
543
}
544
 
545
/** Add one manager to manager list */
546
void async_create_manager(void)
547
{
548
    pstid_t ptid;
549
 
550
    ptid = psthread_create(async_manager_thread, NULL);
551
    psthread_add_manager(ptid);
552
}
553
 
554
/** Remove one manager from manager list */
555
void async_destroy_manager(void)
556
{
557
    psthread_remove_manager();
558
}
559
 
560
/** Initialize internal structures needed for async manager */
561
int _async_init(void)
562
{
1404 palkovsky 563
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
1392 palkovsky 564
        printf("%s: cannot create hash table\n", "async");
565
        return ENOMEM;
566
    }
567
 
568
}
1427 palkovsky 569
 
570
/** IPC handler for messages in async framework
571
 *
572
 * Notify thread that is waiting for this message, that it arrived
573
 */
574
static void reply_received(void *private, int retval,
575
               ipc_call_t *data)
576
{
577
    amsg_t *msg = (amsg_t *) private;
578
 
579
    msg->retval = retval;
580
 
581
    futex_down(&async_futex);
582
    /* Copy data after futex_down, just in case the
583
     * call was detached
584
     */
585
    if (msg->dataptr)
586
        *msg->dataptr = *data;
1435 palkovsky 587
 
1441 palkovsky 588
    write_barrier();
589
    /* Remove message from timeout list */
1500 palkovsky 590
    if (msg->wdata.inlist)
591
        list_remove(&msg->wdata.link);
1427 palkovsky 592
    msg->done = 1;
1500 palkovsky 593
    if (! msg->wdata.active) {
594
        msg->wdata.active = 1;
595
        psthread_add_ready(msg->wdata.ptid);
1427 palkovsky 596
    }
597
    futex_up(&async_futex);
598
}
599
 
600
/** Send message and return id of the sent message
601
 *
602
 * The return value can be used as input for async_wait() to wait
603
 * for completion.
604
 */
605
aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
606
           ipc_call_t *dataptr)
607
{
608
    amsg_t *msg;
609
 
610
    msg = malloc(sizeof(*msg));
611
    msg->done = 0;
612
    msg->dataptr = dataptr;
1500 palkovsky 613
 
614
    msg->wdata.active = 1; /* We may sleep in next method, but it
615
                * will use it's own mechanism */
1518 palkovsky 616
    ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received,1);
1427 palkovsky 617
 
618
    return (aid_t) msg;
619
}
620
 
1547 palkovsky 621
/** Send message and return id of the sent message
622
 *
623
 * The return value can be used as input for async_wait() to wait
624
 * for completion.
625
 */
626
aid_t async_send_3(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
627
           ipcarg_t arg3, ipc_call_t *dataptr)
628
{
629
    amsg_t *msg;
630
 
631
    msg = malloc(sizeof(*msg));
632
    msg->done = 0;
633
    msg->dataptr = dataptr;
634
 
635
    msg->wdata.active = 1; /* We may sleep in next method, but it
636
                * will use it's own mechanism */
637
    ipc_call_async_3(phoneid,method,arg1,arg2,arg3, msg,reply_received,1);
638
 
639
    return (aid_t) msg;
640
}
641
 
1427 palkovsky 642
/** Wait for a message sent by async framework
643
 *
644
 * @param amsgid Message ID to wait for
645
 * @param retval Pointer to variable where will be stored retval
646
 *               of the answered message. If NULL, it is ignored.
647
 *
648
 */
649
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
650
{
651
    amsg_t *msg = (amsg_t *) amsgid;
652
    connection_t *conn;
653
 
654
    futex_down(&async_futex);
655
    if (msg->done) {
656
        futex_up(&async_futex);
657
        goto done;
658
    }
659
 
1500 palkovsky 660
    msg->wdata.ptid = psthread_get_id();
661
    msg->wdata.active = 0;
662
    msg->wdata.inlist = 0;
1427 palkovsky 663
    /* Leave locked async_futex when entering this function */
664
    psthread_schedule_next_adv(PS_TO_MANAGER);
665
    /* futex is up automatically after psthread_schedule_next...*/
666
done:
667
    if (retval)
668
        *retval = msg->retval;
669
    free(msg);
670
}
1435 palkovsky 671
 
1441 palkovsky 672
/** Wait for a message sent by async framework with timeout
673
 *
674
 * @param amsgid Message ID to wait for
675
 * @param retval Pointer to variable where will be stored retval
676
 *               of the answered message. If NULL, it is ignored.
677
 * @param timeout Timeout in usecs
678
 * @return 0 on success, ETIMEOUT if timeout expired
679
 *
680
 */
681
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
682
{
683
    amsg_t *msg = (amsg_t *) amsgid;
684
    connection_t *conn;
1435 palkovsky 685
 
1532 palkovsky 686
    /* TODO: Let it go through the event read at least once */
687
    if (timeout < 0)
688
        return ETIMEOUT;
689
 
1441 palkovsky 690
    futex_down(&async_futex);
691
    if (msg->done) {
692
        futex_up(&async_futex);
693
        goto done;
694
    }
1435 palkovsky 695
 
1500 palkovsky 696
    gettimeofday(&msg->wdata.expires, NULL);
697
    tv_add(&msg->wdata.expires, timeout);
1435 palkovsky 698
 
1500 palkovsky 699
    msg->wdata.ptid = psthread_get_id();
700
    msg->wdata.active = 0;
701
    msg->wdata.inlist = 1;
1435 palkovsky 702
 
1500 palkovsky 703
    insert_timeout(&msg->wdata);
704
 
1441 palkovsky 705
    /* Leave locked async_futex when entering this function */
706
    psthread_schedule_next_adv(PS_TO_MANAGER);
707
    /* futex is up automatically after psthread_schedule_next...*/
1435 palkovsky 708
 
1441 palkovsky 709
    if (!msg->done)
710
        return ETIMEOUT;
711
 
712
done:
713
    if (retval)
714
        *retval = msg->retval;
715
    free(msg);
716
 
717
    return 0;
718
}
719
 
1452 palkovsky 720
/** Wait specified time, but in the meantime handle incoming events
721
 *
722
 * @param timeout Time in microseconds to wait
723
 */
724
void async_usleep(suseconds_t timeout)
725
{
726
    amsg_t *msg;
727
 
728
    msg = malloc(sizeof(*msg));
729
    if (!msg)
730
        return;
731
 
1500 palkovsky 732
    msg->wdata.ptid = psthread_get_id();
733
    msg->wdata.inlist = 1;
734
    msg->wdata.active = 0;
1452 palkovsky 735
 
1500 palkovsky 736
    gettimeofday(&msg->wdata.expires, NULL);
737
    tv_add(&msg->wdata.expires, timeout);
1452 palkovsky 738
 
739
    futex_down(&async_futex);
1500 palkovsky 740
    insert_timeout(&msg->wdata);
1452 palkovsky 741
    /* Leave locked async_futex when entering this function */
742
    psthread_schedule_next_adv(PS_TO_MANAGER);
743
    /* futex is up automatically after psthread_schedule_next...*/
744
    free(msg);
745
}
1490 palkovsky 746
 
747
/** Set function that is called, IPC_M_CONNECT_ME_TO is received
748
 *
749
 * @param conn Function that will form new psthread.
750
 */
751
void async_set_client_connection(async_client_conn_t conn)
752
{
753
    client_connection = conn;
754
}
1596 palkovsky 755
void async_set_interrupt_received(async_client_conn_t conn)
756
{
757
    interrupt_received = conn;
758
}