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1351 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1351 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
 *
2484 jermar 38
 * The aim of this library is facilitating writing programs utilizing the
39
 * asynchronous nature of HelenOS IPC, yet using a normal way of programming.
1392 palkovsky 40
 *
2484 jermar 41
 * You should be able to write very simple multithreaded programs, the async
42
 * framework will automatically take care of most synchronization problems.
1392 palkovsky 43
 *
44
 * Default semantics:
2484 jermar 45
 * - async_send_*():    send asynchronously. If the kernel refuses to send
46
 *          more messages, [ try to get responses from kernel, if
47
 *          nothing found, might try synchronous ]
1392 palkovsky 48
 *
2484 jermar 49
 * Example of use (pseudo C):
1392 palkovsky 50
 *
51
 * 1) Multithreaded client application
2484 jermar 52
 *
53
 * fibril_create(fibril1, ...);
54
 * fibril_create(fibril2, ...);
55
 * ...
1392 palkovsky 56
 *  
2484 jermar 57
 * int fibril1(void *arg)
58
 * {
59
 *  conn = ipc_connect_me_to();
60
 *  c1 = async_send(conn);
61
 *  c2 = async_send(conn);
62
 *  async_wait_for(c1);
63
 *  async_wait_for(c2);
64
 *  ...
65
 * }
1392 palkovsky 66
 *
67
 *
68
 * 2) Multithreaded server application
2484 jermar 69
 * main()
70
 * {
71
 *  async_manager();
1392 palkovsky 72
 * }
73
 *
74
 *
2490 jermar 75
 * my_client_connection(icallid, *icall)
2484 jermar 76
 * {
77
 *  if (want_refuse) {
2619 jermar 78
 *      ipc_answer_0(icallid, ELIMIT);
2484 jermar 79
 *      return;
80
 *  }
2619 jermar 81
 *  ipc_answer_0(icallid, EOK);
1392 palkovsky 82
 *
2484 jermar 83
 *  callid = async_get_call(&call);
84
 *  handle_call(callid, call);
2619 jermar 85
 *  ipc_answer_2(callid, 1, 2, 3);
1407 palkovsky 86
 *
2484 jermar 87
 *  callid = async_get_call(&call);
88
 *  ....
1392 palkovsky 89
 * }
1404 palkovsky 90
 *
1392 palkovsky 91
 */
2484 jermar 92
 
1392 palkovsky 93
#include <futex.h>
94
#include <async.h>
2482 jermar 95
#include <fibril.h>
1392 palkovsky 96
#include <stdio.h>
97
#include <libadt/hash_table.h>
98
#include <libadt/list.h>
99
#include <ipc/ipc.h>
100
#include <assert.h>
101
#include <errno.h>
2486 jermar 102
#include <sys/time.h>
1441 palkovsky 103
#include <arch/barrier.h>
2621 jermar 104
#include <bool.h>
1392 palkovsky 105
 
1463 palkovsky 106
atomic_t async_futex = FUTEX_INITIALIZER;
1392 palkovsky 107
static hash_table_t conn_hash_table;
1441 palkovsky 108
static LIST_INITIALIZE(timeout_list);
1392 palkovsky 109
 
2488 jermar 110
/** Structures of this type represent a waiting fibril. */
1392 palkovsky 111
typedef struct {
2488 jermar 112
    /** Expiration time. */
2482 jermar 113
    struct timeval expires;    
114
    /** If true, this struct is in the timeout list. */
115
    int inlist;
2488 jermar 116
    /** Timeout list link. */
1500 palkovsky 117
    link_t link;
118
 
2490 jermar 119
    /** Identification of and link to the waiting fibril. */
2482 jermar 120
    fid_t fid;
2488 jermar 121
    /** If true, this fibril is currently active. */
2482 jermar 122
    int active;
2488 jermar 123
    /** If true, we have timed out. */
2482 jermar 124
    int timedout;
1500 palkovsky 125
} awaiter_t;
126
 
127
typedef struct {
128
    awaiter_t wdata;
2488 jermar 129
 
130
    /** If reply was received. */
131
    int done;
132
    /** Pointer to where the answer data is stored. */
133
    ipc_call_t *dataptr;
1500 palkovsky 134
 
1427 palkovsky 135
    ipcarg_t retval;
136
} amsg_t;
137
 
2490 jermar 138
/**
139
 * Structures of this type are used to group information about a call and a
140
 * message queue link.
141
 */
1427 palkovsky 142
typedef struct {
1392 palkovsky 143
    link_t link;
144
    ipc_callid_t callid;
145
    ipc_call_t call;
146
} msg_t;
147
 
148
typedef struct {
1500 palkovsky 149
    awaiter_t wdata;
150
 
2488 jermar 151
    /** Hash table link. */
152
    link_t link;
153
 
154
    /** Incoming phone hash. */
155
    ipcarg_t in_phone_hash;    
156
 
157
    /** Messages that should be delivered to this fibril. */
158
    link_t msg_queue;      
159
 
160
    /** Identification of the opening call. */
1392 palkovsky 161
    ipc_callid_t callid;
2488 jermar 162
    /** Call data of the opening call. */
1392 palkovsky 163
    ipc_call_t call;
2488 jermar 164
 
165
    /** Identification of the closing call. */
166
    ipc_callid_t close_callid;
167
 
168
    /** Fibril function that will be used to handle the connection. */
2482 jermar 169
    void (*cfibril)(ipc_callid_t, ipc_call_t *);
1392 palkovsky 170
} connection_t;
171
 
2482 jermar 172
/** Identifier of the incoming connection handled by the current fibril. */
2956 svoboda 173
static __thread connection_t *FIBRIL_connection;
2488 jermar 174
 
2490 jermar 175
/**
176
 * If true, it is forbidden to use async_req functions and all preemption is
177
 * disabled.
178
 */
2956 svoboda 179
static __thread int _in_interrupt_handler;
1392 palkovsky 180
 
1490 palkovsky 181
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call);
1596 palkovsky 182
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call);
2490 jermar 183
 
184
/**
185
 * Pointer to a fibril function that will be used to handle connections.
186
 */
1490 palkovsky 187
static async_client_conn_t client_connection = default_client_connection;
2490 jermar 188
/**
189
 * Pointer to a fibril function that will be used to handle interrupt
190
 * notifications.
191
 */
1596 palkovsky 192
static async_client_conn_t interrupt_received = default_interrupt_received;
1490 palkovsky 193
 
2621 jermar 194
/*
195
 * Getter for _in_interrupt_handler. We need to export the value of this thread
196
 * local variable to other modules, but the binutils 2.18 linkers die on an
197
 * attempt to export this symbol in the header file. For now, consider this as a
198
 * workaround.
199
 */
200
bool in_interrupt_handler(void)
201
{
202
    return _in_interrupt_handler;
203
}
204
 
1404 palkovsky 205
#define CONN_HASH_TABLE_CHAINS  32
1392 palkovsky 206
 
2488 jermar 207
/** Compute hash into the connection hash table based on the source phone hash.
208
 *
209
 * @param key       Pointer to source phone hash.
210
 *
211
 * @return      Index into the connection hash table.
212
 */
1392 palkovsky 213
static hash_index_t conn_hash(unsigned long *key)
1351 palkovsky 214
{
1392 palkovsky 215
    assert(key);
1404 palkovsky 216
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
1351 palkovsky 217
}
218
 
2488 jermar 219
/** Compare hash table item with a key.
220
 *
221
 * @param key       Array containing the source phone hash as the only item.
222
 * @param keys      Expected 1 but ignored.
223
 * @param item      Connection hash table item.
224
 *
225
 * @return      True on match, false otherwise.
226
 */
1392 palkovsky 227
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
1351 palkovsky 228
{
1392 palkovsky 229
    connection_t *hs;
230
 
231
    hs = hash_table_get_instance(item, connection_t, link);
232
 
233
    return key[0] == hs->in_phone_hash;
1351 palkovsky 234
}
235
 
2488 jermar 236
/** Connection hash table removal callback function.
237
 *
238
 * This function is called whenever a connection is removed from the connection
239
 * hash table.
240
 *
241
 * @param item      Connection hash table item being removed.
242
 */
1392 palkovsky 243
static void conn_remove(link_t *item)
1351 palkovsky 244
{
1392 palkovsky 245
    free(hash_table_get_instance(item, connection_t, link));
1351 palkovsky 246
}
247
 
1392 palkovsky 248
 
2488 jermar 249
/** Operations for the connection hash table. */
1392 palkovsky 250
static hash_table_operations_t conn_hash_table_ops = {
251
    .hash = conn_hash,
252
    .compare = conn_compare,
253
    .remove_callback = conn_remove
254
};
255
 
2488 jermar 256
/** Sort in current fibril's timeout request.
1500 palkovsky 257
 *
2488 jermar 258
 * @param wd        Wait data of the current fibril.
1500 palkovsky 259
 */
260
static void insert_timeout(awaiter_t *wd)
261
{
262
    link_t *tmp;
263
    awaiter_t *cur;
264
 
265
    wd->timedout = 0;
1610 palkovsky 266
    wd->inlist = 1;
1500 palkovsky 267
 
268
    tmp = timeout_list.next;
269
    while (tmp != &timeout_list) {
270
        cur = list_get_instance(tmp, awaiter_t, link);
271
        if (tv_gteq(&cur->expires, &wd->expires))
272
            break;
273
        tmp = tmp->next;
274
    }
275
    list_append(&wd->link, tmp);
276
}
277
 
2488 jermar 278
/** Try to route a call to an appropriate connection fibril.
1392 palkovsky 279
 *
2490 jermar 280
 * If the proper connection fibril is found, a message with the call is added to
281
 * its message queue. If the fibril was not active, it is activated and all
282
 * timeouts are unregistered.
283
 *
284
 * @param callid    Hash of the incoming call.
285
 * @param call      Data of the incoming call.
286
 *
287
 * @return      Zero if the call doesn't match any connection.
288
 *          One if the call was passed to the respective connection
289
 *          fibril.
1392 palkovsky 290
 */
291
static int route_call(ipc_callid_t callid, ipc_call_t *call)
1351 palkovsky 292
{
1392 palkovsky 293
    connection_t *conn;
294
    msg_t *msg;
295
    link_t *hlp;
296
    unsigned long key;
297
 
1427 palkovsky 298
    futex_down(&async_futex);
1392 palkovsky 299
 
300
    key = call->in_phone_hash;
301
    hlp = hash_table_find(&conn_hash_table, &key);
302
    if (!hlp) {
1427 palkovsky 303
        futex_up(&async_futex);
1392 palkovsky 304
        return 0;
1351 palkovsky 305
    }
1392 palkovsky 306
    conn = hash_table_get_instance(hlp, connection_t, link);
1351 palkovsky 307
 
1392 palkovsky 308
    msg = malloc(sizeof(*msg));
309
    msg->callid = callid;
310
    msg->call = *call;
311
    list_append(&msg->link, &conn->msg_queue);
1648 palkovsky 312
 
313
    if (IPC_GET_METHOD(*call) == IPC_M_PHONE_HUNGUP)
314
        conn->close_callid = callid;
1392 palkovsky 315
 
2490 jermar 316
    /* If the connection fibril is waiting for an event, activate it */
1500 palkovsky 317
    if (!conn->wdata.active) {
318
        /* If in timeout list, remove it */
319
        if (conn->wdata.inlist) {
320
            conn->wdata.inlist = 0;
321
            list_remove(&conn->wdata.link);
322
        }
323
        conn->wdata.active = 1;
2482 jermar 324
        fibril_add_ready(conn->wdata.fid);
1392 palkovsky 325
    }
1351 palkovsky 326
 
1427 palkovsky 327
    futex_up(&async_futex);
1392 palkovsky 328
 
329
    return 1;
330
}
331
 
2488 jermar 332
/** Return new incoming message for the current (fibril-local) connection.
333
 *
334
 * @param call      Storage where the incoming call data will be stored.
335
 * @param usecs     Timeout in microseconds. Zero denotes no timeout.
336
 *
337
 * @return      If no timeout was specified, then a hash of the
338
 *          incoming call is returned. If a timeout is specified,
339
 *          then a hash of the incoming call is returned unless
340
 *          the timeout expires prior to receiving a message. In
341
 *          that case zero is returned.
342
 */
1500 palkovsky 343
ipc_callid_t async_get_call_timeout(ipc_call_t *call, suseconds_t usecs)
1392 palkovsky 344
{
345
    msg_t *msg;
346
    ipc_callid_t callid;
1536 palkovsky 347
    connection_t *conn;
1392 palkovsky 348
 
2482 jermar 349
    assert(FIBRIL_connection);
350
    /* GCC 4.1.0 coughs on FIBRIL_connection-> dereference,
1536 palkovsky 351
     * GCC 4.1.1 happilly puts the rdhwr instruction in delay slot.
352
     *           I would never expect to find so many errors in
2490 jermar 353
     *           a compiler *($&$(*&$
1536 palkovsky 354
     */
2482 jermar 355
    conn = FIBRIL_connection;
1466 palkovsky 356
 
1427 palkovsky 357
    futex_down(&async_futex);
1392 palkovsky 358
 
1500 palkovsky 359
    if (usecs) {
1536 palkovsky 360
        gettimeofday(&conn->wdata.expires, NULL);
361
        tv_add(&conn->wdata.expires, usecs);
1500 palkovsky 362
    } else {
1536 palkovsky 363
        conn->wdata.inlist = 0;
1500 palkovsky 364
    }
2488 jermar 365
    /* If nothing in queue, wait until something arrives */
1536 palkovsky 366
    while (list_empty(&conn->msg_queue)) {
1610 palkovsky 367
        if (usecs)
1536 palkovsky 368
            insert_timeout(&conn->wdata);
1610 palkovsky 369
 
1536 palkovsky 370
        conn->wdata.active = 0;
2492 jermar 371
        /*
372
         * Note: the current fibril will be rescheduled either due to a
373
         * timeout or due to an arriving message destined to it. In the
374
         * former case, handle_expired_timeouts() and, in the latter
375
         * case, route_call() will perform the wakeup.
376
         */
2568 jermar 377
        fibril_switch(FIBRIL_TO_MANAGER);
2488 jermar 378
        /*
379
         * Futex is up after getting back from async_manager get it
380
         * again.
2492 jermar 381
         */
1500 palkovsky 382
        futex_down(&async_futex);
2482 jermar 383
        if (usecs && conn->wdata.timedout &&
1536 palkovsky 384
            list_empty(&conn->msg_queue)) {
2488 jermar 385
            /* If we timed out -> exit */
1500 palkovsky 386
            futex_up(&async_futex);
387
            return 0;
388
        }
1351 palkovsky 389
    }
390
 
1536 palkovsky 391
    msg = list_get_instance(conn->msg_queue.next, msg_t, link);
1392 palkovsky 392
    list_remove(&msg->link);
393
    callid = msg->callid;
394
    *call = msg->call;
395
    free(msg);
396
 
1427 palkovsky 397
    futex_up(&async_futex);
1392 palkovsky 398
    return callid;
1351 palkovsky 399
}
400
 
2490 jermar 401
/** Default fibril function that gets called to handle new connection.
1404 palkovsky 402
 *
2488 jermar 403
 * This function is defined as a weak symbol - to be redefined in user code.
2490 jermar 404
 *
405
 * @param callid    Hash of the incoming call.
406
 * @param call      Data of the incoming call.
1404 palkovsky 407
 */
1490 palkovsky 408
static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
1392 palkovsky 409
{
2619 jermar 410
    ipc_answer_0(callid, ENOENT);
1392 palkovsky 411
}
2490 jermar 412
 
413
/** Default fibril function that gets called to handle interrupt notifications.
414
 *
415
 * @param callid    Hash of the incoming call.
416
 * @param call      Data of the incoming call.
417
 */
1596 palkovsky 418
static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call)
1452 palkovsky 419
{
420
}
421
 
2485 jermar 422
/** Wrapper for client connection fibril.
1404 palkovsky 423
 *
2490 jermar 424
 * When a new connection arrives, a fibril with this implementing function is
2485 jermar 425
 * created. It calls client_connection() and does the final cleanup.
1404 palkovsky 426
 *
2490 jermar 427
 * @param arg       Connection structure pointer.
2485 jermar 428
 *
429
 * @return      Always zero.
1404 palkovsky 430
 */
2482 jermar 431
static int connection_fibril(void  *arg)
1351 palkovsky 432
{
1404 palkovsky 433
    unsigned long key;
434
    msg_t *msg;
1648 palkovsky 435
    int close_answered = 0;
1404 palkovsky 436
 
2485 jermar 437
    /* Setup fibril-local connection pointer */
2482 jermar 438
    FIBRIL_connection = (connection_t *) arg;
439
    FIBRIL_connection->cfibril(FIBRIL_connection->callid,
440
        &FIBRIL_connection->call);
1719 decky 441
 
2490 jermar 442
    /* Remove myself from the connection hash table */
1427 palkovsky 443
    futex_down(&async_futex);
2482 jermar 444
    key = FIBRIL_connection->in_phone_hash;
1404 palkovsky 445
    hash_table_remove(&conn_hash_table, &key, 1);
1427 palkovsky 446
    futex_up(&async_futex);
1719 decky 447
 
2490 jermar 448
    /* Answer all remaining messages with EHANGUP */
2482 jermar 449
    while (!list_empty(&FIBRIL_connection->msg_queue)) {
450
        msg = list_get_instance(FIBRIL_connection->msg_queue.next,
451
            msg_t, link);
1404 palkovsky 452
        list_remove(&msg->link);
2482 jermar 453
        if (msg->callid == FIBRIL_connection->close_callid)
1648 palkovsky 454
            close_answered = 1;
2619 jermar 455
        ipc_answer_0(msg->callid, EHANGUP);
1404 palkovsky 456
        free(msg);
457
    }
2482 jermar 458
    if (FIBRIL_connection->close_callid)
2619 jermar 459
        ipc_answer_0(FIBRIL_connection->close_callid, EOK);
1719 decky 460
 
461
    return 0;
1351 palkovsky 462
}
1392 palkovsky 463
 
2485 jermar 464
/** Create a new fibril for a new connection.
1392 palkovsky 465
 *
2485 jermar 466
 * Creates new fibril for connection, fills in connection structures and inserts
467
 * it into the hash table, so that later we can easily do routing of messages to
468
 * particular fibrils.
1407 palkovsky 469
 *
2490 jermar 470
 * @param in_phone_hash Identification of the incoming connection.
471
 * @param callid    Hash of the opening IPC_M_CONNECT_ME_TO call.
2534 jermar 472
 *          If callid is zero, the connection was opened by
473
 *          accepting the IPC_M_CONNECT_TO_ME call and this function
474
 *          is called directly by the server.
2490 jermar 475
 * @param call      Call data of the opening call.
476
 * @param cfibril   Fibril function that should be called upon opening the
477
 *          connection.
478
 *
479
 * @return      New fibril id or NULL on failure.
1392 palkovsky 480
 */
2482 jermar 481
fid_t async_new_connection(ipcarg_t in_phone_hash, ipc_callid_t callid,
482
    ipc_call_t *call, void (*cfibril)(ipc_callid_t, ipc_call_t *))
1392 palkovsky 483
{
484
    connection_t *conn;
485
    unsigned long key;
486
 
487
    conn = malloc(sizeof(*conn));
488
    if (!conn) {
2534 jermar 489
        if (callid)
2619 jermar 490
            ipc_answer_0(callid, ENOMEM);
1407 palkovsky 491
        return NULL;
1392 palkovsky 492
    }
1452 palkovsky 493
    conn->in_phone_hash = in_phone_hash;
1392 palkovsky 494
    list_initialize(&conn->msg_queue);
495
    conn->callid = callid;
1648 palkovsky 496
    conn->close_callid = 0;
1453 palkovsky 497
    if (call)
498
        conn->call = *call;
2490 jermar 499
    conn->wdata.active = 1; /* We will activate the fibril ASAP */
2482 jermar 500
    conn->cfibril = cfibril;
1500 palkovsky 501
 
2482 jermar 502
    conn->wdata.fid = fibril_create(connection_fibril, conn);
503
    if (!conn->wdata.fid) {
1392 palkovsky 504
        free(conn);
2534 jermar 505
        if (callid)
2619 jermar 506
            ipc_answer_0(callid, ENOMEM);
1407 palkovsky 507
        return NULL;
1392 palkovsky 508
    }
2490 jermar 509
    /* Add connection to the connection hash table */
1392 palkovsky 510
    key = conn->in_phone_hash;
1427 palkovsky 511
    futex_down(&async_futex);
1392 palkovsky 512
    hash_table_insert(&conn_hash_table, &key, &conn->link);
1427 palkovsky 513
    futex_up(&async_futex);
1392 palkovsky 514
 
2482 jermar 515
    fibril_add_ready(conn->wdata.fid);
1407 palkovsky 516
 
2482 jermar 517
    return conn->wdata.fid;
1392 palkovsky 518
}
519
 
2490 jermar 520
/** Handle a call that was received.
521
 *
522
 * If the call has the IPC_M_CONNECT_ME_TO method, a new connection is created.
523
 * Otherwise the call is routed to its connection fibril.
524
 *
525
 * @param callid    Hash of the incoming call.
526
 * @param call      Data of the incoming call.
527
 */
1392 palkovsky 528
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
529
{
1452 palkovsky 530
    /* Unrouted call - do some default behaviour */
1694 palkovsky 531
    if ((callid & IPC_CALLID_NOTIFICATION)) {
2621 jermar 532
        _in_interrupt_handler = 1;
2569 jermar 533
        (*interrupt_received)(callid, call);
2621 jermar 534
        _in_interrupt_handler = 0;
1452 palkovsky 535
        return;
1694 palkovsky 536
    }      
537
 
538
    switch (IPC_GET_METHOD(*call)) {
1392 palkovsky 539
    case IPC_M_CONNECT_ME_TO:
2485 jermar 540
        /* Open new connection with fibril etc. */
2635 cejka 541
        async_new_connection(IPC_GET_ARG5(*call), callid, call,
2482 jermar 542
            client_connection);
1452 palkovsky 543
        return;
1392 palkovsky 544
    }
1452 palkovsky 545
 
2490 jermar 546
    /* Try to route the call through the connection hash table */
1452 palkovsky 547
    if (route_call(callid, call))
548
        return;
549
 
550
    /* Unknown call from unknown phone - hang it up */
2619 jermar 551
    ipc_answer_0(callid, EHANGUP);
1392 palkovsky 552
}
553
 
2485 jermar 554
/** Fire all timeouts that expired. */
1441 palkovsky 555
static void handle_expired_timeouts(void)
556
{
557
    struct timeval tv;
1500 palkovsky 558
    awaiter_t *waiter;
1441 palkovsky 559
    link_t *cur;
560
 
2490 jermar 561
    gettimeofday(&tv, NULL);
1441 palkovsky 562
    futex_down(&async_futex);
563
 
564
    cur = timeout_list.next;
565
    while (cur != &timeout_list) {
2482 jermar 566
        waiter = list_get_instance(cur, awaiter_t, link);
1500 palkovsky 567
        if (tv_gt(&waiter->expires, &tv))
1441 palkovsky 568
            break;
569
        cur = cur->next;
1500 palkovsky 570
        list_remove(&waiter->link);
571
        waiter->inlist = 0;
572
        waiter->timedout = 1;
2490 jermar 573
        /*
574
         * Redundant condition?
575
         * The fibril should not be active when it gets here.
1441 palkovsky 576
         */
1500 palkovsky 577
        if (!waiter->active) {
578
            waiter->active = 1;
2482 jermar 579
            fibril_add_ready(waiter->fid);
1441 palkovsky 580
        }
581
    }
582
 
583
    futex_up(&async_futex);
584
}
585
 
2490 jermar 586
/** Endless loop dispatching incoming calls and answers.
587
 *
588
 * @return      Never returns.
589
 */
1610 palkovsky 590
static int async_manager_worker(void)
1392 palkovsky 591
{
592
    ipc_call_t call;
593
    ipc_callid_t callid;
1435 palkovsky 594
    int timeout;
1500 palkovsky 595
    awaiter_t *waiter;
1441 palkovsky 596
    struct timeval tv;
1392 palkovsky 597
 
598
    while (1) {
2568 jermar 599
        if (fibril_switch(FIBRIL_FROM_MANAGER)) {
1719 decky 600
            futex_up(&async_futex);
2490 jermar 601
            /*
602
             * async_futex is always held when entering a manager
603
             * fibril.
1719 decky 604
             */
1392 palkovsky 605
            continue;
606
        }
1441 palkovsky 607
        futex_down(&async_futex);
608
        if (!list_empty(&timeout_list)) {
2482 jermar 609
            waiter = list_get_instance(timeout_list.next, awaiter_t,
610
                link);
611
            gettimeofday(&tv, NULL);
1500 palkovsky 612
            if (tv_gteq(&tv, &waiter->expires)) {
1536 palkovsky 613
                futex_up(&async_futex);
1441 palkovsky 614
                handle_expired_timeouts();
615
                continue;
616
            } else
1500 palkovsky 617
                timeout = tv_sub(&waiter->expires, &tv);
1441 palkovsky 618
        } else
1435 palkovsky 619
            timeout = SYNCH_NO_TIMEOUT;
1441 palkovsky 620
        futex_up(&async_futex);
621
 
1503 jermar 622
        callid = ipc_wait_cycle(&call, timeout, SYNCH_FLAGS_NONE);
1392 palkovsky 623
 
1435 palkovsky 624
        if (!callid) {
1441 palkovsky 625
            handle_expired_timeouts();
1435 palkovsky 626
            continue;
627
        }
628
 
1610 palkovsky 629
        if (callid & IPC_CALLID_ANSWERED) {
1392 palkovsky 630
            continue;
1610 palkovsky 631
        }
1427 palkovsky 632
 
1392 palkovsky 633
        handle_call(callid, &call);
634
    }
1719 decky 635
 
636
    return 0;
1392 palkovsky 637
}
638
 
2490 jermar 639
/** Function to start async_manager as a standalone fibril.
1404 palkovsky 640
 *
2490 jermar 641
 * When more kernel threads are used, one async manager should exist per thread.
642
 *
643
 * @param arg       Unused.
644
 *
645
 * @return      Never returns.
1404 palkovsky 646
 */
2484 jermar 647
static int async_manager_fibril(void *arg)
1392 palkovsky 648
{
1719 decky 649
    futex_up(&async_futex);
2490 jermar 650
    /*
651
     * async_futex is always locked when entering manager
652
     */
1610 palkovsky 653
    async_manager_worker();
1719 decky 654
 
655
    return 0;
1392 palkovsky 656
}
657
 
2490 jermar 658
/** Add one manager to manager list. */
1392 palkovsky 659
void async_create_manager(void)
660
{
2482 jermar 661
    fid_t fid;
1392 palkovsky 662
 
2484 jermar 663
    fid = fibril_create(async_manager_fibril, NULL);
2482 jermar 664
    fibril_add_manager(fid);
1392 palkovsky 665
}
666
 
667
/** Remove one manager from manager list */
668
void async_destroy_manager(void)
669
{
2482 jermar 670
    fibril_remove_manager();
1392 palkovsky 671
}
672
 
2490 jermar 673
/** Initialize the async framework.
674
 *
675
 * @return      Zero on success or an error code.
676
 */
1392 palkovsky 677
int _async_init(void)
678
{
2482 jermar 679
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1,
680
        &conn_hash_table_ops)) {
1392 palkovsky 681
        printf("%s: cannot create hash table\n", "async");
682
        return ENOMEM;
683
    }
684
 
1719 decky 685
    return 0;
1392 palkovsky 686
}
1427 palkovsky 687
 
2490 jermar 688
/** Reply received callback.
1427 palkovsky 689
 *
2490 jermar 690
 * This function is called whenever a reply for an asynchronous message sent out
691
 * by the asynchronous framework is received.
692
 *
693
 * Notify the fibril which is waiting for this message that it has arrived.
694
 *
695
 * @param private   Pointer to the asynchronous message record.
696
 * @param retval    Value returned in the answer.
697
 * @param data      Call data of the answer.
1427 palkovsky 698
 */
2485 jermar 699
static void reply_received(void *private, int retval, ipc_call_t *data)
1427 palkovsky 700
{
701
    amsg_t *msg = (amsg_t *) private;
702
 
703
    msg->retval = retval;
704
 
705
    futex_down(&async_futex);
2490 jermar 706
    /* Copy data after futex_down, just in case the call was detached */
1427 palkovsky 707
    if (msg->dataptr)
708
        *msg->dataptr = *data;
1435 palkovsky 709
 
1441 palkovsky 710
    write_barrier();
711
    /* Remove message from timeout list */
1500 palkovsky 712
    if (msg->wdata.inlist)
713
        list_remove(&msg->wdata.link);
1427 palkovsky 714
    msg->done = 1;
2490 jermar 715
    if (!msg->wdata.active) {
1500 palkovsky 716
        msg->wdata.active = 1;
2482 jermar 717
        fibril_add_ready(msg->wdata.fid);
1427 palkovsky 718
    }
719
    futex_up(&async_futex);
720
}
721
 
2490 jermar 722
/** Send message and return id of the sent message.
1427 palkovsky 723
 *
2490 jermar 724
 * The return value can be used as input for async_wait() to wait for
725
 * completion.
726
 *
727
 * @param phoneid   Handle of the phone that will be used for the send.
728
 * @param method    Service-defined method.
729
 * @param arg1      Service-defined payload argument.
730
 * @param arg2      Service-defined payload argument.
2621 jermar 731
 * @param arg3      Service-defined payload argument.
732
 * @param arg4      Service-defined payload argument.
2490 jermar 733
 * @param dataptr   If non-NULL, storage where the reply data will be
734
 *          stored.
735
 *
736
 * @return      Hash of the sent message.
1427 palkovsky 737
 */
2621 jermar 738
aid_t async_send_fast(int phoneid, ipcarg_t method, ipcarg_t arg1,
739
    ipcarg_t arg2, ipcarg_t arg3, ipcarg_t arg4, ipc_call_t *dataptr)
1427 palkovsky 740
{
741
    amsg_t *msg;
742
 
2621 jermar 743
    if (_in_interrupt_handler) {
2482 jermar 744
        printf("Cannot send asynchronous request in interrupt "
745
            "handler.\n");
1610 palkovsky 746
        _exit(1);
747
    }
748
 
1427 palkovsky 749
    msg = malloc(sizeof(*msg));
750
    msg->done = 0;
751
    msg->dataptr = dataptr;
1500 palkovsky 752
 
2490 jermar 753
    /* We may sleep in the next method, but it will use its own mechanism */
754
    msg->wdata.active = 1;
755
 
2621 jermar 756
    ipc_call_async_4(phoneid, method, arg1, arg2, arg3, arg4, msg,
757
        reply_received, 1);
1427 palkovsky 758
 
759
    return (aid_t) msg;
760
}
761
 
1547 palkovsky 762
/** Send message and return id of the sent message
763
 *
2490 jermar 764
 * The return value can be used as input for async_wait() to wait for
765
 * completion.
766
 *
767
 * @param phoneid   Handle of the phone that will be used for the send.
768
 * @param method    Service-defined method.
769
 * @param arg1      Service-defined payload argument.
770
 * @param arg2      Service-defined payload argument.
771
 * @param arg3      Service-defined payload argument.
2621 jermar 772
 * @param arg4      Service-defined payload argument.
773
 * @param arg5      Service-defined payload argument.
2490 jermar 774
 * @param dataptr   If non-NULL, storage where the reply data will be
775
 *          stored.
776
 *
777
 * @return      Hash of the sent message.
1547 palkovsky 778
 */
2621 jermar 779
aid_t async_send_slow(int phoneid, ipcarg_t method, ipcarg_t arg1,
780
    ipcarg_t arg2, ipcarg_t arg3, ipcarg_t arg4, ipcarg_t arg5,
781
    ipc_call_t *dataptr)
1547 palkovsky 782
{
783
    amsg_t *msg;
784
 
2621 jermar 785
    if (_in_interrupt_handler) {
2490 jermar 786
        printf("Cannot send asynchronous request in interrupt "
787
            "handler.\n");
1610 palkovsky 788
        _exit(1);
789
    }
790
 
1547 palkovsky 791
    msg = malloc(sizeof(*msg));
792
    msg->done = 0;
793
    msg->dataptr = dataptr;
794
 
2490 jermar 795
    /* We may sleep in next method, but it will use its own mechanism */
796
    msg->wdata.active = 1;
1547 palkovsky 797
 
2621 jermar 798
    ipc_call_async_5(phoneid, method, arg1, arg2, arg3, arg4, arg5, msg,
799
        reply_received, 1);
800
 
1547 palkovsky 801
    return (aid_t) msg;
802
}
803
 
2490 jermar 804
/** Wait for a message sent by the async framework.
1427 palkovsky 805
 *
2490 jermar 806
 * @param amsgid    Hash of the message to wait for.
807
 * @param retval    Pointer to storage where the retval of the answer will
808
 *          be stored.
1427 palkovsky 809
 */
810
void async_wait_for(aid_t amsgid, ipcarg_t *retval)
811
{
812
    amsg_t *msg = (amsg_t *) amsgid;
813
 
814
    futex_down(&async_futex);
815
    if (msg->done) {
816
        futex_up(&async_futex);
817
        goto done;
818
    }
819
 
2482 jermar 820
    msg->wdata.fid = fibril_get_id();
1500 palkovsky 821
    msg->wdata.active = 0;
822
    msg->wdata.inlist = 0;
2490 jermar 823
    /* Leave the async_futex locked when entering this function */
2568 jermar 824
    fibril_switch(FIBRIL_TO_MANAGER);
825
    /* futex is up automatically after fibril_switch...*/
1427 palkovsky 826
done:
827
    if (retval)
828
        *retval = msg->retval;
829
    free(msg);
830
}
1435 palkovsky 831
 
2490 jermar 832
/** Wait for a message sent by the async framework, timeout variant.
1441 palkovsky 833
 *
2490 jermar 834
 * @param amsgid    Hash of the message to wait for.
835
 * @param retval    Pointer to storage where the retval of the answer will
836
 *          be stored.
837
 * @param timeout   Timeout in microseconds.
1441 palkovsky 838
 *
2490 jermar 839
 * @return      Zero on success, ETIMEOUT if the timeout has expired.
1441 palkovsky 840
 */
841
int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
842
{
843
    amsg_t *msg = (amsg_t *) amsgid;
1435 palkovsky 844
 
1532 palkovsky 845
    /* TODO: Let it go through the event read at least once */
846
    if (timeout < 0)
847
        return ETIMEOUT;
848
 
1441 palkovsky 849
    futex_down(&async_futex);
850
    if (msg->done) {
851
        futex_up(&async_futex);
852
        goto done;
853
    }
1435 palkovsky 854
 
1500 palkovsky 855
    gettimeofday(&msg->wdata.expires, NULL);
856
    tv_add(&msg->wdata.expires, timeout);
1435 palkovsky 857
 
2482 jermar 858
    msg->wdata.fid = fibril_get_id();
1500 palkovsky 859
    msg->wdata.active = 0;
860
    insert_timeout(&msg->wdata);
861
 
2490 jermar 862
    /* Leave the async_futex locked when entering this function */
2568 jermar 863
    fibril_switch(FIBRIL_TO_MANAGER);
864
    /* futex is up automatically after fibril_switch...*/
1435 palkovsky 865
 
1441 palkovsky 866
    if (!msg->done)
867
        return ETIMEOUT;
868
 
869
done:
870
    if (retval)
871
        *retval = msg->retval;
872
    free(msg);
873
 
874
    return 0;
875
}
876
 
2490 jermar 877
/** Wait for specified time.
1452 palkovsky 878
 *
2490 jermar 879
 * The current fibril is suspended but the thread continues to execute.
880
 *
881
 * @param timeout   Duration of the wait in microseconds.
1452 palkovsky 882
 */
883
void async_usleep(suseconds_t timeout)
884
{
885
    amsg_t *msg;
886
 
2621 jermar 887
    if (_in_interrupt_handler) {
1610 palkovsky 888
        printf("Cannot call async_usleep in interrupt handler.\n");
889
        _exit(1);
890
    }
891
 
1452 palkovsky 892
    msg = malloc(sizeof(*msg));
893
    if (!msg)
894
        return;
895
 
2482 jermar 896
    msg->wdata.fid = fibril_get_id();
1500 palkovsky 897
    msg->wdata.active = 0;
1452 palkovsky 898
 
1500 palkovsky 899
    gettimeofday(&msg->wdata.expires, NULL);
900
    tv_add(&msg->wdata.expires, timeout);
1452 palkovsky 901
 
902
    futex_down(&async_futex);
1500 palkovsky 903
    insert_timeout(&msg->wdata);
2490 jermar 904
    /* Leave the async_futex locked when entering this function */
2568 jermar 905
    fibril_switch(FIBRIL_TO_MANAGER);
906
    /* futex is up automatically after fibril_switch()...*/
1452 palkovsky 907
    free(msg);
908
}
1490 palkovsky 909
 
2490 jermar 910
/** Setter for client_connection function pointer.
1490 palkovsky 911
 *
2490 jermar 912
 * @param conn      Function that will implement a new connection fibril.
1490 palkovsky 913
 */
914
void async_set_client_connection(async_client_conn_t conn)
915
{
916
    client_connection = conn;
917
}
2490 jermar 918
 
919
/** Setter for interrupt_received function pointer.
920
 *
921
 * @param conn      Function that will implement a new interrupt
922
 *          notification fibril.
923
 */
1596 palkovsky 924
void async_set_interrupt_received(async_client_conn_t conn)
925
{
926
    interrupt_received = conn;
927
}
1610 palkovsky 928
 
2621 jermar 929
/** Pseudo-synchronous message sending - fast version.
930
 *
931
 * Send message asynchronously and return only after the reply arrives.
932
 *
933
 * This function can only transfer 4 register payload arguments. For
934
 * transferring more arguments, see the slower async_req_slow().
935
 *
936
 * @param phoneid   Hash of the phone through which to make the call.
937
 * @param method    Method of the call.
938
 * @param arg1      Service-defined payload argument.
939
 * @param arg2      Service-defined payload argument.
940
 * @param arg3      Service-defined payload argument.
941
 * @param arg4      Service-defined payload argument.
942
 * @param r1        If non-NULL, storage for the 1st reply argument.
943
 * @param r2        If non-NULL, storage for the 2nd reply argument.
944
 * @param r3        If non-NULL, storage for the 3rd reply argument.
945
 * @param r4        If non-NULL, storage for the 4th reply argument.
946
 * @param r5        If non-NULL, storage for the 5th reply argument.
947
 * @return      Return code of the reply or a negative error code.
948
 */
949
ipcarg_t async_req_fast(int phoneid, ipcarg_t method, ipcarg_t arg1,
950
    ipcarg_t arg2, ipcarg_t arg3, ipcarg_t arg4, ipcarg_t *r1, ipcarg_t *r2,
951
    ipcarg_t *r3, ipcarg_t *r4, ipcarg_t *r5)
1610 palkovsky 952
{
2621 jermar 953
    ipc_call_t result;
954
    ipcarg_t rc;
955
 
956
    aid_t eid = async_send_4(phoneid, method, arg1, arg2, arg3, arg4,
957
        &result);
958
    async_wait_for(eid, &rc);
959
    if (r1)
960
        *r1 = IPC_GET_ARG1(result);
961
    if (r2)
962
        *r2 = IPC_GET_ARG2(result);
963
    if (r3)
964
        *r3 = IPC_GET_ARG3(result);
965
    if (r4)
966
        *r4 = IPC_GET_ARG4(result);
967
    if (r5)
968
        *r5 = IPC_GET_ARG5(result);
969
    return rc;
1610 palkovsky 970
}
971
 
2621 jermar 972
/** Pseudo-synchronous message sending - slow version.
973
 *
974
 * Send message asynchronously and return only after the reply arrives.
975
 *
976
 * @param phoneid   Hash of the phone through which to make the call.
977
 * @param method    Method of the call.
978
 * @param arg1      Service-defined payload argument.
979
 * @param arg2      Service-defined payload argument.
980
 * @param arg3      Service-defined payload argument.
981
 * @param arg4      Service-defined payload argument.
982
 * @param arg5      Service-defined payload argument.
983
 * @param r1        If non-NULL, storage for the 1st reply argument.
984
 * @param r2        If non-NULL, storage for the 2nd reply argument.
985
 * @param r3        If non-NULL, storage for the 3rd reply argument.
986
 * @param r4        If non-NULL, storage for the 4th reply argument.
987
 * @param r5        If non-NULL, storage for the 5th reply argument.
988
 * @return      Return code of the reply or a negative error code.
989
 */
990
ipcarg_t async_req_slow(int phoneid, ipcarg_t method, ipcarg_t arg1,
991
    ipcarg_t arg2, ipcarg_t arg3, ipcarg_t arg4, ipcarg_t arg5, ipcarg_t *r1,
992
    ipcarg_t *r2, ipcarg_t *r3, ipcarg_t *r4, ipcarg_t *r5)
1610 palkovsky 993
{
2621 jermar 994
    ipc_call_t result;
995
    ipcarg_t rc;
996
 
997
    aid_t eid = async_send_5(phoneid, method, arg1, arg2, arg3, arg4, arg5,
998
        &result);
999
    async_wait_for(eid, &rc);
1000
    if (r1)
1001
        *r1 = IPC_GET_ARG1(result);
1002
    if (r2)
1003
        *r2 = IPC_GET_ARG2(result);
1004
    if (r3)
1005
        *r3 = IPC_GET_ARG3(result);
1006
    if (r4)
1007
        *r4 = IPC_GET_ARG4(result);
1008
    if (r5)
1009
        *r5 = IPC_GET_ARG5(result);
1010
    return rc;
1610 palkovsky 1011
}
1653 cejka 1012
 
1719 decky 1013
/** @}
1653 cejka 1014
 */