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;
 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         LIST_INITHEAD(&cb_list);
 197
 198         if (private_loop->private_thread)
 199                 return TDM_ERROR_NONE;
 200
 201         /* enable as default */
 202         thread = tdm_config_get_int(TDM_CONFIG_KEY_GENERAL_THREAD, 1);
 203         if (!thread) {
 204                 TDM_INFO("not using a TDM event thread");
 205                 return TDM_ERROR_NONE;
 206         }
 207
 208         private_thread = calloc(1, sizeof * private_thread);
 209         if (!private_thread) {
 210                 TDM_ERR("alloc failed");
 211                 return TDM_ERROR_OUT_OF_MEMORY;
 212         }
 213
 214         if (pthread_cond_init(&private_thread->event_cond, NULL)) {
 215                 TDM_ERR("pthread_cond_init failed: %m");
 216                 free(private_thread);
 217                 return TDM_ERROR_OUT_OF_MEMORY;
 218         }
 219
 220         if (pipe(private_thread->pipe) != 0) {
 221                 TDM_ERR("pipe failed: %m");
 222                 pthread_cond_destroy(&private_thread->event_cond);
 223                 free(private_thread);
 224                 return TDM_ERROR_OPERATION_FAILED;
 225         }
 226
 227         if (pipe(private_thread->sub_pipe) != 0) {
 228                 TDM_ERR("sub_pipe failed: %m");
 229                 close(private_thread->pipe[0]);
 230                 close(private_thread->pipe[1]);
 231                 pthread_cond_destroy(&private_thread->event_cond);
 232                 free(private_thread);
 233                 return TDM_ERROR_OPERATION_FAILED;
 234         }
 235
 236         keep_private_thread = private_thread;
 237
 238         private_thread->private_loop = private_loop;
 239         private_loop->private_thread = private_thread;
 240
 241         private_thread->display_tid = syscall(SYS_gettid);
 242
 243         /* pthread_cond_wait atomically release mutex, Upon successful return,
 244          * the mutex shall have been locked and shall be owned by the calling thread
 245          */
 246         tdm_mutex_locked = 0;
 247         pthread_create(&private_thread->event_thread, NULL, _tdm_thread_main,
 248                                    private_thread);
 249
 250         /* wait until the tdm thread starts */
 251         pthread_cond_wait(&private_thread->event_cond, &private_display->lock);
 252         tdm_mutex_locked = 1;
 253
 254         TDM_INFO("using a TDM event thread. pipe(%d,%d) sub_pipe(%d,%d)",
 255                          private_thread->pipe[0], private_thread->pipe[1],
 256                          private_thread->sub_pipe[0], private_thread->sub_pipe[1]);
 257
 258         return TDM_ERROR_NONE;
 259 }
 260
 261 INTERN void
 262 tdm_thread_deinit(tdm_private_loop *private_loop)
 263 {
 264         tdm_private_display *private_display;
 265         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 266         int i;
 267
 268         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 269
 270         if (!private_loop->private_thread)
 271                 return;
 272
 273         if (private_loop->private_thread->sub_event_source)
 274                 tdm_event_loop_source_remove(private_loop->private_thread->sub_event_source);
 275
 276         pthread_cancel(private_loop->private_thread->event_thread);
 277
 278         private_display = private_loop->dpy;
 279
 280         /* before falling into the block of pthread_join, we have to unlock the mutex
 281          * for subthread to use the mutex.
 282          */
 283         _pthread_mutex_unlock(&private_display->lock);
 284         pthread_join(private_loop->private_thread->event_thread, NULL);
 285
 286         tdm_log_reset();
 287
 288         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list, link) {
 289                 _tdm_thread_free_cb(cb);
 290         }
 291
 292         if (private_loop->private_thread->pipe[0] >= 0)
 293                 close(private_loop->private_thread->pipe[0]);
 294         if (private_loop->private_thread->pipe[1] >= 0)
 295                 close(private_loop->private_thread->pipe[1]);
 296
 297         if (private_loop->private_thread->sub_pipe[0] >= 0)
 298                 close(private_loop->private_thread->sub_pipe[0]);
 299         if (private_loop->private_thread->sub_pipe[1] >= 0)
 300                 close(private_loop->private_thread->sub_pipe[1]);
 301
 302         pthread_cond_destroy(&private_loop->private_thread->event_cond);
 303
 304         free(private_loop->private_thread);
 305         private_loop->private_thread = NULL;
 306         keep_private_thread = NULL;
 307
 308         for (i = 0; i < TDM_THREAD_CB_MAX; i++)
 309                 find_funcs[i] = NULL;
 310
 311         TDM_INFO("Finish a TDM event thread");
 312 }
 313
 314 INTERN int
 315 tdm_thread_get_fd(tdm_private_loop *private_loop)
 316 {
 317         tdm_private_thread *private_thread;
 318         int in_main;
 319
 320         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 321         TDM_RETURN_VAL_IF_FAIL(private_loop, -1);
 322         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, -1);
 323
 324         private_thread = private_loop->private_thread;
 325
 326         /* seems like ticky. but easy way to use the same APIs for both threads */
 327         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 328
 329         if (in_main)
 330                 return private_thread->pipe[0];
 331         else
 332                 return private_thread->sub_pipe[0];
 333 }
 334
 335 INTERN tdm_error
 336 tdm_thread_send_cb(tdm_private_loop *private_loop, tdm_thread_cb_base *base)
 337 {
 338         tdm_private_thread *private_thread;
 339         ssize_t len;
 340         int pipe, in_main;
 341
 342         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 343         TDM_RETURN_VAL_IF_FAIL(base, TDM_ERROR_INVALID_PARAMETER);
 344         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 345         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 346
 347         private_thread = private_loop->private_thread;
 348
 349         /* seems like ticky. but easy way to use the same APIs for both threads */
 350         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 351
 352         if (in_main)
 353                 pipe = private_thread->sub_pipe[1];
 354         else
 355                 pipe = private_thread->pipe[1];
 356
 357         if (tdm_debug_module & TDM_DEBUG_THREAD)
 358                 TDM_INFO("fd(%d) type(%d), length(%d)", pipe, base->type, base->length);
 359
 360         len = write(pipe, base, base->length);
 361         if (len != base->length) {
 362                 TDM_ERR("write failed (%d != %d): %m", (int)len, base->length);
 363                 return TDM_ERROR_OPERATION_FAILED;
 364         }
 365
 366         if (tdm_debug_module & TDM_DEBUG_THREAD)
 367                 TDM_INFO("[%s] write fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 368
 369         return TDM_ERROR_NONE;
 370 }
 371
 372 INTERN tdm_error
 373 tdm_thread_handle_cb(tdm_private_loop *private_loop)
 374 {
 375         tdm_private_thread *private_thread;
 376         tdm_thread_cb_base *base;
 377         char buffer[1024];
 378         unsigned int i;
 379         int len, pipe, in_main;
 380
 381         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 382         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 383         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 384
 385         private_thread = private_loop->private_thread;
 386
 387         /* seems like ticky. but easy way to use the same APIs for both threads */
 388         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 389
 390         if (in_main)
 391                 pipe = private_thread->pipe[0];
 392         else
 393                 pipe = private_thread->sub_pipe[0];
 394
 395         do {
 396                 len = read(pipe, buffer, sizeof buffer);
 397         } while (len < 0 && errno == EINTR);
 398
 399         if (tdm_debug_module & TDM_DEBUG_THREAD)
 400                 TDM_INFO("[%s] read fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 401
 402         if (len < 0) {
 403                 TDM_ERR("read failed: errno(%d), len(%d) %m", errno, len);
 404                 return TDM_ERROR_OPERATION_FAILED;
 405         }
 406
 407         if (len == 0)
 408                 return TDM_ERROR_NONE;
 409
 410         if (len < sizeof * base) {
 411                 TDM_ERR("read failed: len(%d)", len);
 412                 return TDM_ERROR_OPERATION_FAILED;
 413         }
 414
 415         i = 0;
 416         while (i < len) {
 417                 base = (tdm_thread_cb_base*)&buffer[i];
 418                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 419                         TDM_INFO("type(%d), length(%d)", base->type, base->length);
 420                 switch (base->type) {
 421                 case TDM_THREAD_CB_OUTPUT_COMMIT:
 422                 case TDM_THREAD_CB_OUTPUT_VBLANK:
 423                 case TDM_THREAD_CB_OUTPUT_CHANGE:
 424                 case TDM_THREAD_CB_PP_DONE:
 425                 case TDM_THREAD_CB_CAPTURE_DONE:
 426                 case TDM_THREAD_CB_VBLANK_SW:
 427                 case TDM_THREAD_CB_VBLANK_CREATE:
 428                 case TDM_THREAD_CB_NEED_VALIDATE:
 429                         tdm_thread_cb_call(NULL, base);
 430                         break;
 431                 default:
 432                         break;
 433                 }
 434                 i += base->length;
 435         }
 436
 437         return TDM_ERROR_NONE;
 438 }
 439
 440 INTERN int
 441 tdm_thread_in_display_thread(pid_t tid)
 442 {
 443         if (!keep_private_thread)
 444                 return 1;
 445
 446         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 447
 448         return (keep_private_thread->display_tid == tid) ? 1 : 0;
 449 }
 450
 451 INTERN int
 452 tdm_thread_is_running(void)
 453 {
 454         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 455
 456         return (keep_private_thread) ? 1 : 0;
 457 }
 458
 459 static void
 460 _tdm_thread_free_cb(tdm_private_thread_cb *cb)
 461 {
 462         if (tdm_debug_module & TDM_DEBUG_THREAD)
 463                 TDM_INFO("cb(%p) removed", cb);
 464
 465         assert(LIST_IS_EMPTY(&cb->call_link));
 466
 467         LIST_DEL(&cb->link);
 468         free(cb);
 469 }
 470
 471 static tdm_private_thread_cb *
 472 _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)
 473 {
 474         tdm_private_thread_cb *cb = NULL;
 475
 476         LIST_FOR_EACH_ENTRY(cb, &cb_list, link) {
 477                 if (cb->object == object &&
 478                         cb->cb_type == cb_type &&
 479                         cb->cb_data == cb_data &&
 480                         cb->func == func &&
 481                         cb->user_data == user_data &&
 482                         cb->owner_tid == owner_tid)
 483                         return cb;
 484         }
 485
 486         return NULL;
 487 }
 488
 489 static void
 490 _tdm_thread_reset_cb(tdm_thread_cb_type cb_type)
 491 {
 492         tdm_private_thread_cb *cb = NULL;
 493
 494         LIST_FOR_EACH_ENTRY(cb, &cb_list, link) {
 495                 if (cb->cb_type == cb_type)
 496                         cb->called = 0;
 497         }
 498 }
 499
 500 INTERN void
 501 tdm_thread_cb_set_find_func(tdm_thread_cb_type cb_type, tdm_thread_find_object func)
 502 {
 503         TDM_RETURN_IF_FAIL(cb_type > 0);
 504
 505         if (func && find_funcs[cb_type])
 506                 TDM_NEVER_GET_HERE();
 507
 508         find_funcs[cb_type] = func;
 509 }
 510
 511 INTERN tdm_error
 512 tdm_thread_cb_add(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 513 {
 514         tdm_private_thread_cb *cb = NULL;
 515         pid_t caller_tid;
 516
 517         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 518         TDM_RETURN_VAL_IF_FAIL(object != NULL, TDM_ERROR_INVALID_PARAMETER);
 519         TDM_RETURN_VAL_IF_FAIL(cb_type > 0, TDM_ERROR_INVALID_PARAMETER);
 520         TDM_RETURN_VAL_IF_FAIL(func != NULL, TDM_ERROR_INVALID_PARAMETER);
 521
 522         caller_tid = syscall(SYS_gettid);
 523
 524         cb = _tdm_thread_find_cb(object, cb_type, cb_data, func, user_data, caller_tid);
 525         if (cb) {
 526                 TDM_ERR("can't be added twice with same data");
 527 #if 1
 528                 assert(0);
 529 #endif
 530                 return TDM_ERROR_BAD_REQUEST;
 531         }
 532
 533         cb = calloc(1, sizeof *cb);
 534         if (!cb) {
 535                 TDM_ERR("calloc failed");
 536                 return TDM_ERROR_OUT_OF_MEMORY;
 537         }
 538
 539         LIST_ADDTAIL(&cb->link, &cb_list);
 540         LIST_INITHEAD(&cb->call_link);
 541
 542         cb->object = object;
 543         cb->cb_type = cb_type;
 544         cb->cb_data = cb_data;
 545         cb->func = func;
 546         cb->user_data = user_data;
 547         cb->owner_tid = caller_tid;
 548
 549         if (tdm_debug_module & TDM_DEBUG_THREAD)
 550                 TDM_INFO("cb_type(%d) cb(%p) added", cb_type, cb);
 551
 552         return TDM_ERROR_NONE;
 553 }
 554
 555 INTERN void
 556 tdm_thread_cb_remove(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 557 {
 558         tdm_private_thread_cb *cb;
 559         pid_t caller_tid;
 560
 561         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 562         TDM_RETURN_IF_FAIL(object != NULL);
 563         TDM_RETURN_IF_FAIL(cb_type > 0);
 564         TDM_RETURN_IF_FAIL(func != NULL);
 565
 566         caller_tid = syscall(SYS_gettid);
 567
 568         cb = _tdm_thread_find_cb(object, cb_type, cb_data, func, user_data, caller_tid);
 569         if (!cb)
 570                 return;
 571
 572         _tdm_thread_free_cb(cb);
 573 }
 574
 575 /* when call a callback, we check both cb_base's type and cb_base's data,
 576  * because a callback is added with cb_type and cb_data.
 577  */
 578 INTERN tdm_error
 579 tdm_thread_cb_call(void *object, tdm_thread_cb_base *cb_base)
 580 {
 581         tdm_private_display *private_display = tdm_display_get();
 582         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 583         int handler_in_other_thread = 0;
 584         pid_t caller_tid;
 585         struct list_head call_list;
 586         tdm_error ret;
 587
 588         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 589         TDM_RETURN_VAL_IF_FAIL(cb_base != NULL, TDM_ERROR_INVALID_PARAMETER);
 590         TDM_RETURN_VAL_IF_FAIL(cb_base->type > 0, TDM_ERROR_INVALID_PARAMETER);
 591         TDM_RETURN_VAL_IF_FAIL(cb_base->length > 0, TDM_ERROR_INVALID_PARAMETER);
 592         TDM_RETURN_VAL_IF_FAIL(cb_base->sync == 0 || cb_base->sync == 1, TDM_ERROR_INVALID_PARAMETER);
 593         TDM_RETURN_VAL_IF_FAIL(cb_base->object_stamp > 0, TDM_ERROR_INVALID_PARAMETER);
 594
 595         caller_tid = syscall(SYS_gettid);
 596
 597         assert(find_funcs[cb_base->type] != NULL);
 598
 599         if (!object) {
 600                 object = find_funcs[cb_base->type](private_display, cb_base->object_stamp);
 601                 if (!object) {
 602                         TDM_WRN("%p gone", object);
 603                         return TDM_ERROR_NONE;
 604                 }
 605         }
 606
 607         LIST_INITHEAD(&call_list);
 608
 609         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list, link) {
 610                 if (cb->called ||
 611                         cb->object != object ||
 612                         cb->cb_type != cb_base->type ||
 613                         cb->cb_data != cb_base->data)
 614                         continue;
 615
 616                 if (cb->owner_tid == caller_tid)
 617                         LIST_ADDTAIL(&cb->call_link, &call_list);
 618                 else
 619                         handler_in_other_thread = 1;
 620         }
 621
 622         if (!LIST_IS_EMPTY(&call_list)) {
 623                 LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &call_list, call_link) {
 624                         LIST_DELINIT(&cb->call_link);
 625                         cb->called = 1;
 626                         if (tdm_debug_module & TDM_DEBUG_THREAD)
 627                                 TDM_INFO("cb_type(%d) cb(%p) called", cb->cb_type, cb);
 628                         cb->func(private_display, cb->object, cb_base, cb->user_data);
 629                 }
 630         }
 631
 632         assert(LIST_IS_EMPTY(&call_list));
 633
 634         if (!handler_in_other_thread) {
 635                 _tdm_thread_reset_cb(cb_base->type);
 636                 if (keep_private_thread) {
 637                         if (cb_base->sync) {
 638                                 pthread_cond_signal(&keep_private_thread->event_cond);
 639                                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 640                                         TDM_INFO("pthread broadcase");
 641                         }
 642                 }
 643                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 644                         TDM_INFO("'%s' thread_cb done(sync:%d)", tdm_cb_type_str(cb_base->type), cb_base->sync);
 645                 return TDM_ERROR_NONE;
 646         }
 647
 648         /* Once we reach here, it means that keep_private_thread is not NULL.
 649          * Just make the crash. Avoiding it is not going to help us.
 650          */
 651         ret = tdm_thread_send_cb(private_display->private_loop, cb_base);
 652         TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, TDM_ERROR_OPERATION_FAILED);
 653
 654         /* waiting until all cb are done in another thread */
 655         if (cb_base->sync) {
 656                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 657                         TDM_INFO("pthread wait");
 658
 659                 /* pthread_cond_wait atomically release mutex, Upon successful return,
 660                  * the mutex shall have been locked and shall be owned by the calling thread
 661                  */
 662                 tdm_mutex_locked = 0;
 663                 pthread_cond_wait(&keep_private_thread->event_cond, &private_display->lock);
 664                 tdm_mutex_locked = 1;
 665         }
 666
 667         if (tdm_debug_module & TDM_DEBUG_THREAD)
 668                 TDM_INFO("'%s' thread_cb done(sync:%d)", tdm_cb_type_str(cb_base->type), cb_base->sync);
 669
 670         return TDM_ERROR_NONE;
 671 }