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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.
1653 cejka 27
 */
28
 
1719 decky 29
/** @addtogroup libc
1653 cejka 30
 * @{
31
 */
32
/** @file
1351 palkovsky 33
 */
34
 
1392 palkovsky 35
/**
36
 * Asynchronous library
37
 *
38
 * The aim of this library is facilitating writing programs utilizing
1971 jermar 39
 * the asynchronous nature of HelenOS IPC, yet using a normal way
1392 palkovsky 40
 * of programming.
41
 *
42
 * You should be able to write very simple multithreaded programs,
43
 * the async framework will automatically take care of most synchronization
44
 * problems.
45
 *
46
 * Default semantics:
47
 * - send() - send asynchronously. If the kernel refuses to send more
48
 *            messages, [ try to get responses from kernel, if nothing
49
 *            found, might try synchronous ]
50
 *
51
 * Example of use:
52
 *
53
 * 1) Multithreaded client application
54
 *  create_thread(thread1);
55
 *  create_thread(thread2);
56
 *  ...
57
 *  
58
 *  thread1() {
59
 *        conn = ipc_connect_me_to();
60
 *        c1 = send(conn);
61
 *        c2 = send(conn);
62
 *        wait_for(c1);
63
 *        wait_for(c2);
64
 *  }
65
 *
66
 *
67
 * 2) Multithreaded server application
68
 * main() {
1407 palkovsky 69
 *      async_manager();
1392 palkovsky 70
 * }
71
 *
72
 *
1407 palkovsky 73
 * client_connection(icallid, *icall) {
74
 *       if (want_refuse) {
75
 *           ipc_answer_fast(icallid, ELIMIT, 0, 0);
76
 *           return;
77
 *       }
78
 *       ipc_answer_fast(icallid, 0, 0, 0);
1392 palkovsky 79
 *
1407 palkovsky 80
 *       callid = async_get_call(&call);
81
 *       handle(callid, call);
1971 jermar 82
 *       ipc_answer_fast(callid, 1, 2, 3);
1407 palkovsky 83
 *
84
 *       callid = async_get_call(&call);
1392 palkovsky 85
 *       ....
86
 * }
1404 palkovsky 87
 *
1405 decky 88
 * TODO: Detaching/joining dead psthreads?
1392 palkovsky 89
 */
90
#include <futex.h>
91
#include <async.h>
92
#include <psthread.h>
93
#include <stdio.h>
94
#include <libadt/hash_table.h>
95
#include <libadt/list.h>
96
#include <ipc/ipc.h>
97
#include <assert.h>
98
#include <errno.h>
1441 palkovsky 99
#include <time.h>
100
#include <arch/barrier.h>
1392 palkovsky 101
 
1463 palkovsky 102
atomic_t async_futex = FUTEX_INITIALIZER;
1392 palkovsky 103
static hash_table_t conn_hash_table;
1441 palkovsky 104
static LIST_INITIALIZE(timeout_list);
1392 palkovsky 105
 
106
typedef struct {
1971 jermar 107
    struct timeval expires;     /**< Expiration time for waiting thread */
108
    int inlist;                 /**< If true, this struct is in timeout list */
1500 palkovsky 109
    link_t link;
110
 
1971 jermar 111
    pstid_t ptid;               /**< Thread waiting for this message */
112
    int active;                 /**< If this thread is currently active */
113
    int timedout;               /**< If true, we timed out */
1500 palkovsky 114
} awaiter_t;
115
 
116
typedef struct {
117
    awaiter_t wdata;
118
 
1971 jermar 119
    int done;                   /**< If reply was received */
120
    ipc_call_t *dataptr;        /**< Pointer where the answer data
121
                      *   is stored */
1427 palkovsky 122
    ipcarg_t retval;
123
} amsg_t;
124
 
125
typedef struct {
1392 palkovsky 126
    link_t link;
127
    ipc_callid_t callid;
128
    ipc_call_t call;
129
} msg_t;
130
 
131
typedef struct {
1500 palkovsky 132
    awaiter_t wdata;
133
 
1971 jermar 134
    link_t link;            /**< Hash table link */
135
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
136
    link_t msg_queue;       /**< Messages that should be delivered to this thread */
1392 palkovsky 137
    /* Structures for connection opening packet */
138
    ipc_callid_t callid;
139
    ipc_call_t call;
1971 jermar 140
    ipc_callid_t close_callid;  /* Identification of closing packet */
1407 palkovsky 141
    void (*cthread)(ipc_callid_t,ipc_call_t *);
1392 palkovsky 142
} connection_t;
143
 
1610 palkovsky 144
/** Identifier of incoming connection handled by current thread */
1392 palkovsky 145
__thread connection_t *PS_connection;
1610 palkovsky 146
/** If true, it is forbidden to use async_req functions and
147
 *  all preemption is disabled */
148
__thread int in_interrupt_handler;
1392 palkovsky 149
 
1490 palkovsky 150
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call);
1596 palkovsky 151
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call);
1490 palkovsky 152
static async_client_conn_t client_connection = default_client_connection;
1596 palkovsky 153
static async_client_conn_t interrupt_received = default_interrupt_received;
1490 palkovsky 154
 
1441 palkovsky 155
/** Add microseconds to give timeval */
156
static void tv_add(struct timeval *tv, suseconds_t usecs)
157
{
158
    tv->tv_sec += usecs / 1000000;
159
    tv->tv_usec += usecs % 1000000;
160
    if (tv->tv_usec > 1000000) {
161
        tv->tv_sec++;
162
        tv->tv_usec -= 1000000;
163
    }
164
}
165
 
166
/** Subtract 2 timevals, return microseconds difference */
167
static suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
168
{
169
    suseconds_t result;
170
 
171
    result = tv1->tv_usec - tv2->tv_usec;
172
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
173
 
174
    return result;
175
}
176
 
177
/** Compare timeval
178
 *
179
 * @return 1 if tv1 > tv2, otherwise 0
180
 */
181
static int tv_gt(struct timeval *tv1, struct timeval *tv2)
182
{
183
    if (tv1->tv_sec > tv2->tv_sec)
184
        return 1;
185
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
186
        return 1;
187
    return 0;
188
}
1466 palkovsky 189
static int tv_gteq(struct timeval *tv1, struct timeval *tv2)
190
{
191
    if (tv1->tv_sec > tv2->tv_sec)
192
        return 1;
193
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
194
        return 1;
195
    return 0;
196
}
1441 palkovsky 197
 
1392 palkovsky 198
/* Hash table functions */
1404 palkovsky 199
#define CONN_HASH_TABLE_CHAINS  32
1392 palkovsky 200
 
201
static hash_index_t conn_hash(unsigned long *key)
1351 palkovsky 202
{
1392 palkovsky 203
    assert(key);
1404 palkovsky 204
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
1351 palkovsky 205
}
206
 
1392 palkovsky 207
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
1351 palkovsky 208
{
1392 palkovsky 209
    connection_t *hs;
210
 
211
    hs = hash_table_get_instance(item, connection_t, link);
212
 
213
    return key[0] == hs->in_phone_hash;
1351 palkovsky 214
}
215
 
1392 palkovsky 216
static void conn_remove(link_t *item)
1351 palkovsky 217
{
1392 palkovsky 218
    free(hash_table_get_instance(item, connection_t, link));
1351 palkovsky 219
}
220
 
1392 palkovsky 221
 
222
/** Operations for NS hash table. */
223
static hash_table_operations_t conn_hash_table_ops = {
224
    .hash = conn_hash,
225
    .compare = conn_compare,
226
    .remove_callback = conn_remove
227
};
228
 
1500 palkovsky 229
/** Insert sort timeout msg into timeouts list
230
 *
231
 */
232
static void insert_timeout(awaiter_t *wd)
233
{
234
    link_t *tmp;
235
    awaiter_t *cur;
236
 
237
    wd->timedout = 0;
1610 palkovsky 238
    wd->inlist = 1;
1500 palkovsky 239
 
240
    tmp = timeout_list.next;
241
    while (tmp != &timeout_list) {
242
        cur = list_get_instance(tmp, awaiter_t, link);
243
        if (tv_gteq(&cur->expires, &wd->expires))
244
            break;
245
        tmp = tmp->next;
246
    }
247
    list_append(&wd->link, tmp);
248
}
249
 
1427 palkovsky 250
/*************************************************/
251
 
1392 palkovsky 252
/** Try to route a call to an appropriate connection thread
253
 *
254
 */
255
static int route_call(ipc_callid_t callid, ipc_call_t *call)
1351 palkovsky 256
{
1392 palkovsky 257
    connection_t *conn;
258
    msg_t *msg;
259
    link_t *hlp;
260
    unsigned long key;
261
 
1427 palkovsky 262
    futex_down(&async_futex);
1392 palkovsky 263
 
264
    key = call->in_phone_hash;
265
    hlp = hash_table_find(&conn_hash_table, &key);
266
    if (!hlp) {
1427 palkovsky 267
        futex_up(&async_futex);
1392 palkovsky 268
        return 0;
1351 palkovsky 269
    }
1392 palkovsky 270
    conn = hash_table_get_instance(hlp, connection_t, link);
1351 palkovsky 271
 
1392 palkovsky 272
    msg = malloc(sizeof(*msg));
273
    msg->callid = callid;
274
    msg->call = *call;
275
    list_append(&msg->link, &conn->msg_queue);
1648 palkovsky 276
 
277
    if (IPC_GET_METHOD(*call) == IPC_M_PHONE_HUNGUP)
278
        conn->close_callid = callid;
1392 palkovsky 279
 
1500 palkovsky 280
    /* If the call is waiting for event, run it */
281
    if (!conn->wdata.active) {
282
        /* If in timeout list, remove it */
283
        if (conn->wdata.inlist) {
284
            conn->wdata.inlist = 0;
285
            list_remove(&conn->wdata.link);
286
        }
287
        conn->wdata.active = 1;
288
        psthread_add_ready(conn->wdata.ptid);
1392 palkovsky 289
    }
1351 palkovsky 290
 
1427 palkovsky 291
    futex_up(&async_futex);
1392 palkovsky 292
 
293
    return 1;
294
}
295
 
1404 palkovsky 296
/** Return new incoming message for current(thread-local) connection */
1500 palkovsky 297
ipc_callid_t async_get_call_timeout(ipc_call_t *call, suseconds_t usecs)
1392 palkovsky 298
{
299
    msg_t *msg;
300
    ipc_callid_t callid;
1536 palkovsky 301
    connection_t *conn;
1392 palkovsky 302
 
1466 palkovsky 303
    assert(PS_connection);
1536 palkovsky 304
    /* GCC 4.1.0 coughs on PS_connection-> dereference,
305
     * GCC 4.1.1 happilly puts the rdhwr instruction in delay slot.
306
     *           I would never expect to find so many errors in
307
     *           compiler *($&$(*&$
308
     */
309
    conn = PS_connection;
1466 palkovsky 310
 
1427 palkovsky 311
    futex_down(&async_futex);
1392 palkovsky 312
 
1500 palkovsky 313
    if (usecs) {
1536 palkovsky 314
        gettimeofday(&conn->wdata.expires, NULL);
315
        tv_add(&conn->wdata.expires, usecs);
1500 palkovsky 316
    } else {
1536 palkovsky 317
        conn->wdata.inlist = 0;
1500 palkovsky 318
    }
1392 palkovsky 319
    /* If nothing in queue, wait until something appears */
1536 palkovsky 320
    while (list_empty(&conn->msg_queue)) {
1610 palkovsky 321
        if (usecs)
1536 palkovsky 322
            insert_timeout(&conn->wdata);
1610 palkovsky 323
 
1536 palkovsky 324
        conn->wdata.active = 0;
1392 palkovsky 325
        psthread_schedule_next_adv(PS_TO_MANAGER);
1500 palkovsky 326
        /* Futex is up after getting back from async_manager
327
         * get it again */
328
        futex_down(&async_futex);
1536 palkovsky 329
        if (usecs && conn->wdata.timedout && \
330
            list_empty(&conn->msg_queue)) {
1500 palkovsky 331
            /* If we timed out-> exit */
332
            futex_up(&async_futex);
333
            return 0;
334
        }
1351 palkovsky 335
    }
336
 
1536 palkovsky 337
    msg = list_get_instance(conn->msg_queue.next, msg_t, link);
1392 palkovsky 338
    list_remove(&msg->link);
339
    callid = msg->callid;
340
    *call = msg->call;
341
    free(msg);
342
 
1427 palkovsky 343
    futex_up(&async_futex);
1392 palkovsky 344
    return callid;
1351 palkovsky 345
}
346
 
1404 palkovsky 347
/** Thread function that gets created on new connection
348
 *
349
 * This function is defined as a weak symbol - to be redefined in
350
 * user code.
351
 */
1490 palkovsky 352
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
1392 palkovsky 353
{
1404 palkovsky 354
    ipc_answer_fast(callid, ENOENT, 0, 0);
1392 palkovsky 355
}
1596 palkovsky 356
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call)
1452 palkovsky 357
{
358
}
359
 
1404 palkovsky 360
/** Wrapper for client connection thread
361
 *
362
 * When new connection arrives, thread with this function is created.
363
 * It calls client_connection and does final cleanup.
364
 *
1653 cejka 365
 * @param arg Connection structure pointer
1404 palkovsky 366
 */
1392 palkovsky 367
static int connection_thread(void  *arg)
1351 palkovsky 368
{
1404 palkovsky 369
    unsigned long key;
370
    msg_t *msg;
1648 palkovsky 371
    int close_answered = 0;
1404 palkovsky 372
 
1392 palkovsky 373
    /* Setup thread local connection pointer */
374
    PS_connection = (connection_t *)arg;
1470 palkovsky 375
    PS_connection->cthread(PS_connection->callid, &PS_connection->call);
1719 decky 376
 
1404 palkovsky 377
    /* Remove myself from connection hash table */
1427 palkovsky 378
    futex_down(&async_futex);
1470 palkovsky 379
    key = PS_connection->in_phone_hash;
1404 palkovsky 380
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 381
    futex_up(&async_futex);
1719 decky 382
 
1404 palkovsky 383
    /* Answer all remaining messages with ehangup */
1470 palkovsky 384
    while (!list_empty(&PS_connection->msg_queue)) {
385
        msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
1404 palkovsky 386
        list_remove(&msg->link);
1648 palkovsky 387
        if (msg->callid == PS_connection->close_callid)
388
            close_answered = 1;
1404 palkovsky 389
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
390
        free(msg);
391
    }
1648 palkovsky 392
    if (PS_connection->close_callid)
393
        ipc_answer_fast(PS_connection->close_callid, 0, 0, 0);
1719 decky 394
 
395
    return 0;
1351 palkovsky 396
}
1392 palkovsky 397
 
398
/** Create new thread for a new connection
399
 *
400
 * Creates new thread for connection, fills in connection
401
 * structures and inserts it into the hash table, so that
402
 * later we can easily do routing of messages to particular
403
 * threads.
1407 palkovsky 404
 *
1452 palkovsky 405
 * @param in_phone_hash Identification of the incoming connection
1407 palkovsky 406
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
407
 * @param call Call data of the opening packet
408
 * @param cthread Thread function that should be called upon
409
 *                opening the connection
410
 * @return New thread id
1392 palkovsky 411
 */
1719 decky 412
pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid, ipc_call_t *call, void (*cthread)(ipc_callid_t, ipc_call_t *))
1392 palkovsky 413
{
414
    connection_t *conn;
415
    unsigned long key;
416
 
417
    conn = malloc(sizeof(*conn));
418
    if (!conn) {
419
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 420
        return NULL;
1392 palkovsky 421
    }
1452 palkovsky 422
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 423
    list_initialize(&conn->msg_queue);
424
    conn->callid = callid;
1648 palkovsky 425
    conn->close_callid = 0;
1453 palkovsky 426
    if (call)
427
        conn->call = *call;
1500 palkovsky 428
    conn->wdata.active = 1; /* We will activate it asap */
1407 palkovsky 429
    conn->cthread = cthread;
1500 palkovsky 430
 
431
    conn->wdata.ptid = psthread_create(connection_thread, conn);
432
    if (!conn->wdata.ptid) {
1392 palkovsky 433
        free(conn);
434
        ipc_answer_fast(callid, ENOMEM, 0, 0);
1407 palkovsky 435
        return NULL;
1392 palkovsky 436
    }
1500 palkovsky 437
    /* Add connection to hash table */
1392 palkovsky 438
    key = conn->in_phone_hash;
1427 palkovsky 439
    futex_down(&async_futex);
1392 palkovsky 440
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 441
    futex_up(&async_futex);
1392 palkovsky 442
 
1500 palkovsky 443
    psthread_add_ready(conn->wdata.ptid);
1407 palkovsky 444
 
1500 palkovsky 445
    return conn->wdata.ptid;
1392 palkovsky 446
}
447
 
1427 palkovsky 448
/** Handle call that was received */
1392 palkovsky 449
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
450
{
1452 palkovsky 451
    /* Unrouted call - do some default behaviour */
1694 palkovsky 452
    if ((callid & IPC_CALLID_NOTIFICATION)) {
1610 palkovsky 453
        in_interrupt_handler = 1;
1596 palkovsky 454
        (*interrupt_received)(callid,call);
1610 palkovsky 455
        in_interrupt_handler = 0;
1452 palkovsky 456
        return;
1694 palkovsky 457
    }      
458
 
459
    switch (IPC_GET_METHOD(*call)) {
1392 palkovsky 460
    case IPC_M_CONNECT_ME_TO:
461
        /* Open new connection with thread etc. */
1452 palkovsky 462
        async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
463
        return;
1392 palkovsky 464
    }
1452 palkovsky 465
 
466
    /* Try to route call through connection tables */
467
    if (route_call(callid, call))
468
        return;
469
 
470
    /* Unknown call from unknown phone - hang it up */
471
    ipc_answer_fast(callid, EHANGUP, 0, 0);
1392 palkovsky 472
}
473
 
1536 palkovsky 474
/** Fire all timeouts that expired
475
 *
476
 */
1441 palkovsky 477
static void handle_expired_timeouts(void)
478
{
479
    struct timeval tv;
1500 palkovsky 480
    awaiter_t *waiter;
1441 palkovsky 481
    link_t *cur;
482
 
483
    gettimeofday(&tv,NULL);
484
    futex_down(&async_futex);
485
 
486
    cur = timeout_list.next;
487
    while (cur != &timeout_list) {
1500 palkovsky 488
        waiter = list_get_instance(cur,awaiter_t,link);
489
        if (tv_gt(&waiter->expires, &tv))
1441 palkovsky 490
            break;
491
        cur = cur->next;
1500 palkovsky 492
        list_remove(&waiter->link);
493
        waiter->inlist = 0;
494
        waiter->timedout = 1;
1441 palkovsky 495
        /* Redundant condition? The thread should not
496
         * be active when it gets here.
497
         */
1500 palkovsky 498
        if (!waiter->active) {
499
            waiter->active = 1;
500
            psthread_add_ready(waiter->ptid);
1441 palkovsky 501
        }
502
    }
503
 
504
    futex_up(&async_futex);
505
}
506
 
1392 palkovsky 507
/** Endless loop dispatching incoming calls and answers */
1610 palkovsky 508
static int async_manager_worker(void)
1392 palkovsky 509
{
510
    ipc_call_t call;
511
    ipc_callid_t callid;
1435 palkovsky 512
    int timeout;
1500 palkovsky 513
    awaiter_t *waiter;
1441 palkovsky 514
    struct timeval tv;
1392 palkovsky 515
 
516
    while (1) {
517
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
1719 decky 518
            futex_up(&async_futex);
519
            /* async_futex is always held
520
             * when entering manager thread
521
             */
1392 palkovsky 522
            continue;
523
        }
1441 palkovsky 524
        futex_down(&async_futex);
525
        if (!list_empty(&timeout_list)) {
1500 palkovsky 526
            waiter = list_get_instance(timeout_list.next,awaiter_t,link);
1441 palkovsky 527
            gettimeofday(&tv,NULL);
1500 palkovsky 528
            if (tv_gteq(&tv, &waiter->expires)) {
1536 palkovsky 529
                futex_up(&async_futex);
1441 palkovsky 530
                handle_expired_timeouts();
531
                continue;
532
            } else
1500 palkovsky 533
                timeout = tv_sub(&waiter->expires, &tv);
1441 palkovsky 534
        } else
1435 palkovsky 535
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 536
        futex_up(&async_futex);
537
 
1503 jermar 538
        callid = ipc_wait_cycle(&call, timeout, SYNCH_FLAGS_NONE);
1392 palkovsky 539
 
1435 palkovsky 540
        if (!callid) {
1441 palkovsky 541
            handle_expired_timeouts();
1435 palkovsky 542
            continue;
543
        }
544
 
1610 palkovsky 545
        if (callid & IPC_CALLID_ANSWERED) {
1392 palkovsky 546
            continue;
1610 palkovsky 547
        }
1427 palkovsky 548
 
1392 palkovsky 549
        handle_call(callid, &call);
550
    }
1719 decky 551
 
552
    return 0;
1392 palkovsky 553
}
554
 
1404 palkovsky 555
/** Function to start async_manager as a standalone thread
556
 *
557
 * When more kernel threads are used, one async manager should
558
 * exist per thread. The particular implementation may change,
559
 * currently one async_manager is started automatically per kernel
560
 * thread except main thread.
561
 */
1392 palkovsky 562
static int async_manager_thread(void *arg)
563
{
1719 decky 564
    futex_up(&async_futex);
565
    /* async_futex is always locked when entering
566
     * manager */
1610 palkovsky 567
    async_manager_worker();
1719 decky 568
 
569
    return 0;
1392 palkovsky 570
}
571
 
572
/** Add one manager to manager list */
573
void async_create_manager(void)
574
{
575
    pstid_t ptid;
576
 
577
    ptid = psthread_create(async_manager_thread, NULL);
578
    psthread_add_manager(ptid);
579
}
580
 
581
/** Remove one manager from manager list */
582
void async_destroy_manager(void)
583
{
584
    psthread_remove_manager();
585
}
586
 
587
/** Initialize internal structures needed for async manager */
588
int _async_init(void)
589
{
1404 palkovsky 590
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
1392 palkovsky 591
        printf("%s: cannot create hash table\n", "async");
592
        return ENOMEM;
593
    }
594
 
1719 decky 595
    return 0;
1392 palkovsky 596
}
1427 palkovsky 597
 
598
/** IPC handler for messages in async framework
599
 *
600
 * Notify thread that is waiting for this message, that it arrived
601
 */
602
static void reply_received(void *private, int retval,
603
               ipc_call_t *data)
604
{
605
    amsg_t *msg = (amsg_t *) private;
606
 
607
    msg->retval = retval;
608
 
609
    futex_down(&async_futex);
610
    /* Copy data after futex_down, just in case the
611
     * call was detached
612
     */
613
    if (msg->dataptr)
614
        *msg->dataptr = *data;
1435 palkovsky 615
 
1441 palkovsky 616
    write_barrier();
617
    /* Remove message from timeout list */
1500 palkovsky 618
    if (msg->wdata.inlist)
619
        list_remove(&msg->wdata.link);
1427 palkovsky 620
    msg->done = 1;
1500 palkovsky 621
    if (! msg->wdata.active) {
622
        msg->wdata.active = 1;
623
        psthread_add_ready(msg->wdata.ptid);
1427 palkovsky 624
    }
625
    futex_up(&async_futex);
626
}
627
 
628
/** Send message and return id of the sent message
629
 *
630
 * The return value can be used as input for async_wait() to wait
631
 * for completion.
632
 */
633
aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
634
           ipc_call_t *dataptr)
635
{
636
    amsg_t *msg;
637
 
1610 palkovsky 638
    if (in_interrupt_handler) {
1923 jermar 639
        printf("Cannot send asynchronous request in interrupt handler.\n");
1610 palkovsky 640
        _exit(1);
641
    }
642
 
1427 palkovsky 643
    msg = malloc(sizeof(*msg));
644
    msg->done = 0;
645
    msg->dataptr = dataptr;
1500 palkovsky 646
 
647
    msg->wdata.active = 1; /* We may sleep in next method, but it
648
                * will use it's own mechanism */
1518 palkovsky 649
    ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received,1);
1427 palkovsky 650
 
651
    return (aid_t) msg;
652
}
653
 
1547 palkovsky 654
/** Send message and return id of the sent message
655
 *
656
 * The return value can be used as input for async_wait() to wait
657
 * for completion.
658
 */
659
aid_t async_send_3(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
660
           ipcarg_t arg3, ipc_call_t *dataptr)
661
{
662
    amsg_t *msg;
663
 
1610 palkovsky 664
    if (in_interrupt_handler) {
1923 jermar 665
        printf("Cannot send asynchronous request in interrupt handler.\n");
1610 palkovsky 666
        _exit(1);
667
    }
668
 
1547 palkovsky 669
    msg = malloc(sizeof(*msg));
670
    msg->done = 0;
671
    msg->dataptr = dataptr;
672
 
673
    msg->wdata.active = 1; /* We may sleep in next method, but it
674
                * will use it's own mechanism */
675
    ipc_call_async_3(phoneid,method,arg1,arg2,arg3, msg,reply_received,1);
676
 
677
    return (aid_t) msg;
678
}
679
 
1427 palkovsky 680
/** Wait for a message sent by async framework
681
 *
682
 * @param amsgid Message ID to wait for
683
 * @param retval Pointer to variable where will be stored retval
684
 *               of the answered message. If NULL, it is ignored.
685
 *
686
 */
687
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
688
{
689
    amsg_t *msg = (amsg_t *) amsgid;
690
 
691
    futex_down(&async_futex);
692
    if (msg->done) {
693
        futex_up(&async_futex);
694
        goto done;
695
    }
696
 
1500 palkovsky 697
    msg->wdata.ptid = psthread_get_id();
698
    msg->wdata.active = 0;
699
    msg->wdata.inlist = 0;
1427 palkovsky 700
    /* Leave locked async_futex when entering this function */
701
    psthread_schedule_next_adv(PS_TO_MANAGER);
702
    /* futex is up automatically after psthread_schedule_next...*/
703
done:
704
    if (retval)
705
        *retval = msg->retval;
706
    free(msg);
707
}
1435 palkovsky 708
 
1441 palkovsky 709
/** Wait for a message sent by async framework with timeout
710
 *
711
 * @param amsgid Message ID to wait for
712
 * @param retval Pointer to variable where will be stored retval
713
 *               of the answered message. If NULL, it is ignored.
714
 * @param timeout Timeout in usecs
715
 * @return 0 on success, ETIMEOUT if timeout expired
716
 *
717
 */
718
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
719
{
720
    amsg_t *msg = (amsg_t *) amsgid;
1435 palkovsky 721
 
1532 palkovsky 722
    /* TODO: Let it go through the event read at least once */
723
    if (timeout < 0)
724
        return ETIMEOUT;
725
 
1441 palkovsky 726
    futex_down(&async_futex);
727
    if (msg->done) {
728
        futex_up(&async_futex);
729
        goto done;
730
    }
1435 palkovsky 731
 
1500 palkovsky 732
    gettimeofday(&msg->wdata.expires, NULL);
733
    tv_add(&msg->wdata.expires, timeout);
1435 palkovsky 734
 
1500 palkovsky 735
    msg->wdata.ptid = psthread_get_id();
736
    msg->wdata.active = 0;
737
    insert_timeout(&msg->wdata);
738
 
1441 palkovsky 739
    /* Leave locked async_futex when entering this function */
740
    psthread_schedule_next_adv(PS_TO_MANAGER);
741
    /* futex is up automatically after psthread_schedule_next...*/
1435 palkovsky 742
 
1441 palkovsky 743
    if (!msg->done)
744
        return ETIMEOUT;
745
 
746
done:
747
    if (retval)
748
        *retval = msg->retval;
749
    free(msg);
750
 
751
    return 0;
752
}
753
 
1452 palkovsky 754
/** Wait specified time, but in the meantime handle incoming events
755
 *
756
 * @param timeout Time in microseconds to wait
757
 */
758
void async_usleep(suseconds_t timeout)
759
{
760
    amsg_t *msg;
761
 
1610 palkovsky 762
    if (in_interrupt_handler) {
763
        printf("Cannot call async_usleep in interrupt handler.\n");
764
        _exit(1);
765
    }
766
 
1452 palkovsky 767
    msg = malloc(sizeof(*msg));
768
    if (!msg)
769
        return;
770
 
1500 palkovsky 771
    msg->wdata.ptid = psthread_get_id();
772
    msg->wdata.active = 0;
1452 palkovsky 773
 
1500 palkovsky 774
    gettimeofday(&msg->wdata.expires, NULL);
775
    tv_add(&msg->wdata.expires, timeout);
1452 palkovsky 776
 
777
    futex_down(&async_futex);
1500 palkovsky 778
    insert_timeout(&msg->wdata);
1452 palkovsky 779
    /* Leave locked async_futex when entering this function */
780
    psthread_schedule_next_adv(PS_TO_MANAGER);
781
    /* futex is up automatically after psthread_schedule_next...*/
782
    free(msg);
783
}
1490 palkovsky 784
 
785
/** Set function that is called, IPC_M_CONNECT_ME_TO is received
786
 *
787
 * @param conn Function that will form new psthread.
788
 */
789
void async_set_client_connection(async_client_conn_t conn)
790
{
791
    client_connection = conn;
792
}
1596 palkovsky 793
void async_set_interrupt_received(async_client_conn_t conn)
794
{
795
    interrupt_received = conn;
796
}
1610 palkovsky 797
 
798
/* Primitive functions for simple communication */
799
void async_msg_3(int phoneid, ipcarg_t method, ipcarg_t arg1,
800
         ipcarg_t arg2, ipcarg_t arg3)
801
{
802
    ipc_call_async_3(phoneid, method, arg1, arg2, arg3, NULL, NULL, !in_interrupt_handler);
803
}
804
 
805
void async_msg_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2)
806
{
807
    ipc_call_async_2(phoneid, method, arg1, arg2, NULL, NULL, !in_interrupt_handler);
808
}
1653 cejka 809
 
1719 decky 810
/** @}
1653 cejka 811
 */