src/tdm_thread.c

   1 /**************************************************************************
   2  *
   3  * libtdm
   4  *
   5  * Copyright 2015 Samsung Electronics co., Ltd. All Rights Reserved.
   6  *
   7  * Contact: Eunchul Kim <chulspro.kim@samsung.com>,
   8  *          JinYoung Jeon <jy0.jeon@samsung.com>,
   9  *          Taeheon Kim <th908.kim@samsung.com>,
  10  *          YoungJun Cho <yj44.cho@samsung.com>,
  11  *          SooChan Lim <sc1.lim@samsung.com>,
  12  *          Boram Park <sc1.lim@samsung.com>
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the
  16  * "Software"), to deal in the Software without restriction, including
  17  * without limitation the rights to use, copy, modify, merge, publish,
  18  * distribute, sub license, and/or sell copies of the Software, and to
  19  * permit persons to whom the Software is furnished to do so, subject to
  20  * the following conditions:
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  27  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  29  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  30  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  31  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  32  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33  *
  34 **************************************************************************/
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include "tdm_private.h"
  41
  42 static tdm_private_thread *keep_private_thread;
  43
  44 struct _tdm_private_thread {
  45         tdm_private_loop *private_loop;
  46
  47         pthread_cond_t event_cond;
  48         pthread_t event_thread;
  49
  50         pid_t display_tid;
  51         pid_t thread_tid;
  52
  53         /* 0: read, 1: write (tdm-thread -> display-thread) */
  54         int pipe[2];
  55
  56         /* 0: read, 1: write (tdm-thread <- display-thread) */
  57         int sub_pipe[2];
  58         tdm_event_loop_source *sub_event_source;
  59 };
  60
  61 typedef struct _tdm_private_thread_cb {
  62         struct list_head link;
  63         struct list_head call_link;
  64
  65         void *object;
  66         tdm_thread_cb_type cb_type;
  67         void *cb_data;
  68         tdm_thread_cb func;
  69         void *user_data;
  70
  71         pid_t owner_tid;
  72         unsigned int called;
  73 } tdm_private_thread_cb;
  74
  75 static tdm_thread_find_object find_funcs[TDM_THREAD_CB_MAX] = {0, };
  76 static struct list_head cb_list;
  77
  78 static void _tdm_thread_free_cb(tdm_private_thread_cb *cb);
  79
  80 static tdm_error
  81 _tdm_thread_handle_events(int fd, tdm_event_loop_mask mask, void *user_data)
  82 {
  83         tdm_private_loop *private_loop = user_data;
  84         tdm_error ret;
  85
  86         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
  87         TDM_RETURN_VAL_IF_FAIL(private_loop != NULL, TDM_ERROR_OPERATION_FAILED);
  88         TDM_RETURN_VAL_IF_FAIL(private_loop->dpy != NULL, TDM_ERROR_OPERATION_FAILED);
  89
  90         ret = tdm_thread_handle_cb(private_loop);
  91
  92         TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, ret);
  93
  94         return TDM_ERROR_NONE;
  95 }
  96
  97 static void*
  98 _tdm_thread_main(void *data)
  99 {
 100         tdm_private_thread *private_thread = (tdm_private_thread*)data;
 101         tdm_private_loop *private_loop = private_thread->private_loop;
 102         int fd;
 103         struct pollfd fds;
 104         int ret;
 105         tdm_error error;
 106
 107         /* Not lock/unlock for the private_thread and private_loop structure
 108          * because they won't be destroyed as long as tdm thread is running.
 109          * When they're destroyed, we have already exit the tdm thread.
 110          */
 111         private_thread->thread_tid = syscall(SYS_gettid);
 112
 113         TDM_INFO("display_tid:%d, thread_tid: %d",
 114                          private_thread->display_tid, private_thread->thread_tid);
 115
 116         /* fd SHOULD be the same with sub_pipe[0] to make sure that using
 117          * tdm_thread_get_fd, tdm_thread_send_cb, tdm_thread_handle_cb in
 118          * both threads is fine. Otherwise, assert.
 119          */
 120         tdm_display_lock(private_loop->dpy);
 121         assert(tdm_thread_get_fd(private_loop) == private_thread->sub_pipe[0]);
 122
 123         private_thread->sub_event_source =
 124                 tdm_event_loop_add_fd_handler(private_loop->dpy,
 125                                                                           private_thread->sub_pipe[0],
 126                                                                           TDM_EVENT_LOOP_READABLE,
 127                                                                           _tdm_thread_handle_events,
 128                                                                           private_loop,
 129                                                                           &error);
 130         TDM_GOTO_IF_FAIL(error == TDM_ERROR_NONE, exit_thread);
 131         TDM_GOTO_IF_FAIL(private_thread->sub_event_source != NULL, exit_thread);
 132
 133         pthread_cond_signal(&private_thread->event_cond);
 134
 135         /* mutex shall be locked by the thread calling pthread_cond_signal() */
 136         tdm_display_unlock(private_loop->dpy);
 137
 138         fd = tdm_event_loop_get_fd(private_loop->dpy);
 139         if (fd < 0) {
 140                 TDM_ERR("couldn't get fd");
 141                 goto exit_thread;
 142         }
 143
 144         fds.events = POLLIN;
 145         fds.fd = fd;
 146         fds.revents = 0;
 147
 148         while (1) {
 149                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 150                         TDM_INFO("server flush");
 151                 tdm_event_loop_flush(private_loop->dpy);
 152
 153                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 154                         TDM_INFO("fd(%d) polling in", fd);
 155
 156                 ret = poll(&fds, 1, -1);
 157
 158                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 159                         TDM_INFO("fd(%d) polling out", fd);
 160
 161                 if (ret < 0) {
 162                         if (errno == EINTR || errno == EAGAIN)  /* normal case */
 163                                 continue;
 164                         else {
 165                                 TDM_ERR("poll failed: %m");
 166                                 goto exit_thread;
 167                         }
 168                 }
 169
 170                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 171                         TDM_INFO("thread got events");
 172
 173                 if (tdm_event_loop_dispatch(private_loop->dpy) < 0)
 174                         TDM_ERR("dispatch error");
 175         }
 176
 177 exit_thread:
 178         tdm_display_unlock(private_loop->dpy);
 179         pthread_exit(NULL);
 180 }
 181
 182 /* NOTE: tdm thread doesn't care about multi-thread. */
 183 INTERN tdm_error
 184 tdm_thread_init(tdm_private_loop *private_loop)
 185 {
 186         tdm_private_display *private_display;
 187         tdm_private_thread *private_thread;
 188         int thread, i;
 189
 190         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 191         TDM_RETURN_VAL_IF_FAIL(private_loop->dpy, TDM_ERROR_OPERATION_FAILED);
 192
 193         private_display = private_loop->dpy;
 194         TDM_RETURN_VAL_IF_FAIL(private_display->private_loop, TDM_ERROR_OPERATION_FAILED);
 195
 196         for (i = 0; i < TDM_THREAD_CB_MAX; i++)
 197                 find_funcs[i] = NULL;
 198
 199         LIST_INITHEAD(&cb_list);
 200
 201         if (private_loop->private_thread)
 202                 return TDM_ERROR_NONE;
 203
 204         /* enable as default */
 205         thread = tdm_config_get_int(TDM_CONFIG_KEY_GENERAL_THREAD, 1);
 206         if (!thread) {
 207                 TDM_INFO("not using a TDM event thread");
 208                 return TDM_ERROR_NONE;
 209         }
 210
 211         private_thread = calloc(1, sizeof * private_thread);
 212         if (!private_thread) {
 213                 TDM_ERR("alloc failed");
 214                 return TDM_ERROR_OUT_OF_MEMORY;
 215         }
 216
 217         if (pthread_cond_init(&private_thread->event_cond, NULL)) {
 218                 TDM_ERR("pthread_cond_init failed: %m");
 219                 free(private_thread);
 220                 return TDM_ERROR_OUT_OF_MEMORY;
 221         }
 222
 223         if (pipe(private_thread->pipe) != 0) {
 224                 TDM_ERR("pipe failed: %m");
 225                 pthread_cond_destroy(&private_thread->event_cond);
 226                 free(private_thread);
 227                 return TDM_ERROR_OPERATION_FAILED;
 228         }
 229
 230         if (pipe(private_thread->sub_pipe) != 0) {
 231                 TDM_ERR("sub_pipe failed: %m");
 232                 close(private_thread->pipe[0]);
 233                 close(private_thread->pipe[1]);
 234                 pthread_cond_destroy(&private_thread->event_cond);
 235                 free(private_thread);
 236                 return TDM_ERROR_OPERATION_FAILED;
 237         }
 238
 239         keep_private_thread = private_thread;
 240
 241         private_thread->private_loop = private_loop;
 242         private_loop->private_thread = private_thread;
 243
 244         private_thread->display_tid = syscall(SYS_gettid);
 245
 246         /* pthread_cond_wait atomically release mutex, Upon successful return,
 247          * the mutex shall have been locked and shall be owned by the calling thread
 248          */
 249         tdm_mutex_locked = 0;
 250         pthread_create(&private_thread->event_thread, NULL, _tdm_thread_main,
 251                                    private_thread);
 252
 253         /* wait until the tdm thread starts */
 254         pthread_cond_wait(&private_thread->event_cond, &private_display->lock);
 255         tdm_mutex_locked = 1;
 256
 257         TDM_INFO("using a TDM event thread. pipe(%d,%d) sub_pipe(%d,%d)",
 258                          private_thread->pipe[0], private_thread->pipe[1],
 259                          private_thread->sub_pipe[0], private_thread->sub_pipe[1]);
 260
 261         return TDM_ERROR_NONE;
 262 }
 263
 264 INTERN void
 265 tdm_thread_deinit(tdm_private_loop *private_loop)
 266 {
 267         tdm_private_display *private_display;
 268         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 269         int i;
 270
 271         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 272
 273         for (i = 0; i < TDM_THREAD_CB_MAX; i++)
 274                 find_funcs[i] = NULL;
 275
 276         if (!private_loop->private_thread)
 277                 return;
 278
 279         if (private_loop->private_thread->sub_event_source)
 280                 tdm_event_loop_source_remove(private_loop->private_thread->sub_event_source);
 281
 282         pthread_cancel(private_loop->private_thread->event_thread);
 283
 284         private_display = private_loop->dpy;
 285
 286         /* before falling into the block of pthread_join, we have to unlock the mutex
 287          * for subthread to use the mutex.
 288          */
 289         _pthread_mutex_unlock(&private_display->lock);
 290         pthread_join(private_loop->private_thread->event_thread, NULL);
 291
 292         tdm_log_reset();
 293
 294         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list, link) {
 295                 _tdm_thread_free_cb(cb);
 296         }
 297
 298         if (private_loop->private_thread->pipe[0] >= 0)
 299                 close(private_loop->private_thread->pipe[0]);
 300         if (private_loop->private_thread->pipe[1] >= 0)
 301                 close(private_loop->private_thread->pipe[1]);
 302
 303         if (private_loop->private_thread->sub_pipe[0] >= 0)
 304                 close(private_loop->private_thread->sub_pipe[0]);
 305         if (private_loop->private_thread->sub_pipe[1] >= 0)
 306                 close(private_loop->private_thread->sub_pipe[1]);
 307
 308         pthread_cond_destroy(&private_loop->private_thread->event_cond);
 309
 310         free(private_loop->private_thread);
 311         private_loop->private_thread = NULL;
 312         keep_private_thread = NULL;
 313
 314         TDM_INFO("Finish a TDM event thread");
 315 }
 316
 317 INTERN int
 318 tdm_thread_get_fd(tdm_private_loop *private_loop)
 319 {
 320         tdm_private_thread *private_thread;
 321         int in_main;
 322
 323         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 324         TDM_RETURN_VAL_IF_FAIL(private_loop, -1);
 325         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, -1);
 326
 327         private_thread = private_loop->private_thread;
 328
 329         /* seems like ticky. but easy way to use the same APIs for both threads */
 330         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 331
 332         if (in_main)
 333                 return private_thread->pipe[0];
 334         else
 335                 return private_thread->sub_pipe[0];
 336 }
 337
 338 INTERN tdm_error
 339 tdm_thread_send_cb(tdm_private_loop *private_loop, tdm_thread_cb_base *base)
 340 {
 341         tdm_private_thread *private_thread;
 342         ssize_t len;
 343         int pipe, in_main;
 344
 345         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 346         TDM_RETURN_VAL_IF_FAIL(base, TDM_ERROR_INVALID_PARAMETER);
 347         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 348         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 349
 350         private_thread = private_loop->private_thread;
 351
 352         /* seems like ticky. but easy way to use the same APIs for both threads */
 353         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 354
 355         if (in_main)
 356                 pipe = private_thread->sub_pipe[1];
 357         else
 358                 pipe = private_thread->pipe[1];
 359
 360         if (tdm_debug_module & TDM_DEBUG_THREAD)
 361                 TDM_INFO("fd(%d) type(%d), length(%d)", pipe, base->type, base->length);
 362
 363         len = write(pipe, base, base->length);
 364         if (len != base->length) {
 365                 TDM_ERR("write failed (%d != %d): %m", (int)len, base->length);
 366                 return TDM_ERROR_OPERATION_FAILED;
 367         }
 368
 369         if (tdm_debug_module & TDM_DEBUG_THREAD)
 370                 TDM_INFO("[%s] write fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 371
 372         return TDM_ERROR_NONE;
 373 }
 374
 375 INTERN tdm_error
 376 tdm_thread_handle_cb(tdm_private_loop *private_loop)
 377 {
 378         tdm_private_thread *private_thread;
 379         tdm_thread_cb_base *base;
 380         char buffer[1024];
 381         unsigned int i;
 382         int len, pipe, in_main;
 383
 384         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 385         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 386         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 387
 388         private_thread = private_loop->private_thread;
 389
 390         /* seems like ticky. but easy way to use the same APIs for both threads */
 391         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 392
 393         if (in_main)
 394                 pipe = private_thread->pipe[0];
 395         else
 396                 pipe = private_thread->sub_pipe[0];
 397
 398         do {
 399                 len = read(pipe, buffer, sizeof buffer);
 400         } while (len < 0 && errno == EINTR);
 401
 402         if (tdm_debug_module & TDM_DEBUG_THREAD)
 403                 TDM_INFO("[%s] read fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 404
 405         if (len < 0) {
 406                 TDM_ERR("read failed: errno(%d), len(%d) %m", errno, len);
 407                 return TDM_ERROR_OPERATION_FAILED;
 408         }
 409
 410         if (len == 0)
 411                 return TDM_ERROR_NONE;
 412
 413         if (len < sizeof * base) {
 414                 TDM_ERR("read failed: len(%d)", len);
 415                 return TDM_ERROR_OPERATION_FAILED;
 416         }
 417
 418         i = 0;
 419         while (i < len) {
 420                 base = (tdm_thread_cb_base*)&buffer[i];
 421                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 422                         TDM_INFO("type(%d), length(%d)", base->type, base->length);
 423                 switch (base->type) {
 424                 case TDM_THREAD_CB_OUTPUT_COMMIT:
 425                 case TDM_THREAD_CB_OUTPUT_VBLANK:
 426                 case TDM_THREAD_CB_OUTPUT_CHANGE:
 427                 case TDM_THREAD_CB_PP_DONE:
 428                 case TDM_THREAD_CB_CAPTURE_DONE:
 429                 case TDM_THREAD_CB_VBLANK_SW:
 430                 case TDM_THREAD_CB_VBLANK_CREATE:
 431                 case TDM_THREAD_CB_NEED_VALIDATE:
 432                         tdm_thread_cb_call(NULL, base);
 433                         break;
 434                 default:
 435                         break;
 436                 }
 437                 i += base->length;
 438         }
 439
 440         return TDM_ERROR_NONE;
 441 }
 442
 443 INTERN int
 444 tdm_thread_in_display_thread(pid_t tid)
 445 {
 446         if (!keep_private_thread)
 447                 return 1;
 448
 449         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 450
 451         return (keep_private_thread->display_tid == tid) ? 1 : 0;
 452 }
 453
 454 INTERN int
 455 tdm_thread_is_running(void)
 456 {
 457         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 458
 459         return (keep_private_thread) ? 1 : 0;
 460 }
 461
 462 static void
 463 _tdm_thread_free_cb(tdm_private_thread_cb *cb)
 464 {
 465         if (tdm_debug_module & TDM_DEBUG_THREAD)
 466                 TDM_INFO("cb(%p) removed", cb);
 467
 468         assert(LIST_IS_EMPTY(&cb->call_link));
 469
 470         LIST_DEL(&cb->link);
 471         free(cb);
 472 }
 473
 474 static tdm_private_thread_cb *
 475 _tdm_thread_find_cb(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data, pid_t owner_tid)
 476 {
 477         tdm_private_thread_cb *cb = NULL;
 478
 479         LIST_FOR_EACH_ENTRY(cb, &cb_list, link) {
 480                 if (cb->object == object &&
 481                         cb->cb_type == cb_type &&
 482                         cb->cb_data == cb_data &&
 483                         cb->func == func &&
 484                         cb->user_data == user_data &&
 485                         cb->owner_tid == owner_tid)
 486                         return cb;
 487         }
 488
 489         return NULL;
 490 }
 491
 492 static void
 493 _tdm_thread_reset_cb(tdm_thread_cb_type cb_type)
 494 {
 495         tdm_private_thread_cb *cb = NULL;
 496
 497         LIST_FOR_EACH_ENTRY(cb, &cb_list, link) {
 498                 if (cb->cb_type == cb_type)
 499                         cb->called = 0;
 500         }
 501 }
 502
 503 INTERN void
 504 tdm_thread_cb_set_find_func(tdm_thread_cb_type cb_type, tdm_thread_find_object func)
 505 {
 506         TDM_RETURN_IF_FAIL(cb_type > 0);
 507
 508         if (func && find_funcs[cb_type])
 509                 TDM_NEVER_GET_HERE();
 510
 511         find_funcs[cb_type] = func;
 512 }
 513
 514 INTERN tdm_error
 515 tdm_thread_cb_add(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 516 {
 517         tdm_private_thread_cb *cb = NULL;
 518         pid_t caller_tid;
 519
 520         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 521         TDM_RETURN_VAL_IF_FAIL(object != NULL, TDM_ERROR_INVALID_PARAMETER);
 522         TDM_RETURN_VAL_IF_FAIL(cb_type > 0, TDM_ERROR_INVALID_PARAMETER);
 523         TDM_RETURN_VAL_IF_FAIL(func != NULL, TDM_ERROR_INVALID_PARAMETER);
 524
 525         caller_tid = syscall(SYS_gettid);
 526
 527         cb = _tdm_thread_find_cb(object, cb_type, cb_data, func, user_data, caller_tid);
 528         if (cb) {
 529                 TDM_ERR("can't be added twice with same data");
 530 #if 1
 531                 assert(0);
 532 #endif
 533                 return TDM_ERROR_BAD_REQUEST;
 534         }
 535
 536         cb = calloc(1, sizeof *cb);
 537         if (!cb) {
 538                 TDM_ERR("calloc failed");
 539                 return TDM_ERROR_OUT_OF_MEMORY;
 540         }
 541
 542         LIST_ADDTAIL(&cb->link, &cb_list);
 543         LIST_INITHEAD(&cb->call_link);
 544
 545         cb->object = object;
 546         cb->cb_type = cb_type;
 547         cb->cb_data = cb_data;
 548         cb->func = func;
 549         cb->user_data = user_data;
 550         cb->owner_tid = caller_tid;
 551
 552         if (tdm_debug_module & TDM_DEBUG_THREAD)
 553                 TDM_INFO("cb_type(%d) cb(%p) added", cb_type, cb);
 554
 555         return TDM_ERROR_NONE;
 556 }
 557
 558 INTERN void
 559 tdm_thread_cb_remove(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 560 {
 561         tdm_private_thread_cb *cb;
 562         pid_t caller_tid;
 563
 564         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 565         TDM_RETURN_IF_FAIL(object != NULL);
 566         TDM_RETURN_IF_FAIL(cb_type > 0);
 567         TDM_RETURN_IF_FAIL(func != NULL);
 568
 569         caller_tid = syscall(SYS_gettid);
 570
 571         cb = _tdm_thread_find_cb(object, cb_type, cb_data, func, user_data, caller_tid);
 572         if (!cb)
 573                 return;
 574
 575         _tdm_thread_free_cb(cb);
 576 }
 577
 578 /* when call a callback, we check both cb_base's type and cb_base's data,
 579  * because a callback is added with cb_type and cb_data.
 580  */
 581 INTERN tdm_error
 582 tdm_thread_cb_call(void *object, tdm_thread_cb_base *cb_base)
 583 {
 584         tdm_private_display *private_display = tdm_display_get();
 585         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 586         int handler_in_other_thread = 0;
 587         pid_t caller_tid;
 588         struct list_head call_list;
 589         tdm_error ret;
 590
 591         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 592         TDM_RETURN_VAL_IF_FAIL(cb_base != NULL, TDM_ERROR_INVALID_PARAMETER);
 593         TDM_RETURN_VAL_IF_FAIL(cb_base->type > 0, TDM_ERROR_INVALID_PARAMETER);
 594         TDM_RETURN_VAL_IF_FAIL(cb_base->length > 0, TDM_ERROR_INVALID_PARAMETER);
 595         TDM_RETURN_VAL_IF_FAIL(cb_base->sync == 0 || cb_base->sync == 1, TDM_ERROR_INVALID_PARAMETER);
 596         TDM_RETURN_VAL_IF_FAIL(cb_base->object_stamp > 0, TDM_ERROR_INVALID_PARAMETER);
 597
 598         caller_tid = syscall(SYS_gettid);
 599
 600         assert(find_funcs[cb_base->type] != NULL);
 601
 602         if (!object) {
 603                 object = find_funcs[cb_base->type](private_display, cb_base->object_stamp);
 604                 if (!object) {
 605                         TDM_WRN("%p gone", object);
 606                         return TDM_ERROR_NONE;
 607                 }
 608         }
 609
 610         LIST_INITHEAD(&call_list);
 611
 612         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list, link) {
 613                 if (cb->called ||
 614                         cb->object != object ||
 615                         cb->cb_type != cb_base->type ||
 616                         cb->cb_data != cb_base->data)
 617                         continue;
 618
 619                 if (cb->owner_tid == caller_tid)
 620                         LIST_ADDTAIL(&cb->call_link, &call_list);
 621                 else
 622                         handler_in_other_thread = 1;
 623         }
 624
 625         if (!LIST_IS_EMPTY(&call_list)) {
 626                 LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &call_list, call_link) {
 627                         LIST_DELINIT(&cb->call_link);
 628                         cb->called = 1;
 629                         if (tdm_debug_module & TDM_DEBUG_THREAD)
 630                                 TDM_INFO("cb_type(%d) cb(%p) called", cb->cb_type, cb);
 631                         cb->func(private_display, cb->object, cb_base, cb->user_data);
 632                 }
 633         }
 634
 635         assert(LIST_IS_EMPTY(&call_list));
 636
 637         if (!handler_in_other_thread) {
 638                 _tdm_thread_reset_cb(cb_base->type);
 639                 if (keep_private_thread) {
 640                         if (cb_base->sync) {
 641                                 pthread_cond_signal(&keep_private_thread->event_cond);
 642                                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 643                                         TDM_INFO("pthread broadcase");
 644                         }
 645                 }
 646                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 647                         TDM_INFO("'%s' thread_cb done(sync:%d)", tdm_cb_type_str(cb_base->type), cb_base->sync);
 648                 return TDM_ERROR_NONE;
 649         }
 650
 651         /* Once we reach here, it means that keep_private_thread is not NULL.
 652          * Just make the crash. Avoiding it is not going to help us.
 653          */
 654         ret = tdm_thread_send_cb(private_display->private_loop, cb_base);
 655         TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, TDM_ERROR_OPERATION_FAILED);
 656
 657         /* waiting until all cb are done in another thread */
 658         if (cb_base->sync) {
 659                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 660                         TDM_INFO("pthread wait");
 661
 662                 /* pthread_cond_wait atomically release mutex, Upon successful return,
 663                  * the mutex shall have been locked and shall be owned by the calling thread
 664                  */
 665                 tdm_mutex_locked = 0;
 666                 pthread_cond_wait(&keep_private_thread->event_cond, &private_display->lock);
 667                 tdm_mutex_locked = 1;
 668         }
 669
 670         if (tdm_debug_module & TDM_DEBUG_THREAD)
 671                 TDM_INFO("'%s' thread_cb done(sync:%d)", tdm_cb_type_str(cb_base->type), cb_base->sync);
 672
 673         return TDM_ERROR_NONE;
 674 }