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 <boram1288.park@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         unsigned int event_thread_exit;
  50         unsigned int event_thread_joined;
  51
  52         pid_t display_tid;
  53         pid_t thread_tid;
  54
  55         /* 0: read, 1: write (tdm-thread -> display-thread) */
  56         int pipe[2];
  57
  58         /* 0: read, 1: write (tdm-thread <- display-thread) */
  59         int sub_pipe[2];
  60         tdm_event_loop_source *sub_event_source;
  61 };
  62
  63 typedef struct _tdm_private_thread_cb {
  64         struct list_head link;
  65         struct list_head call_link;
  66
  67         void *object;
  68         tdm_thread_cb_type cb_type;
  69         void *cb_data;
  70         tdm_thread_cb func;
  71         void *user_data;
  72
  73         pid_t owner_tid;
  74 } tdm_private_thread_cb;
  75
  76 static tdm_thread_find_object find_funcs[TDM_THREAD_CB_MAX] = {0, };
  77
  78 /* 0: for display thread, 1: for tdm thread */
  79 static struct list_head cb_list[2];
  80 static pthread_mutex_t cb_list_lock = PTHREAD_MUTEX_INITIALIZER;
  81
  82 static void _tdm_thread_free_cb(tdm_private_thread_cb *cb);
  83
  84 static tdm_error
  85 _tdm_thread_handle_events(int fd, tdm_event_loop_mask mask, void *user_data)
  86 {
  87         tdm_private_loop *private_loop = user_data;
  88         tdm_error ret;
  89
  90         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
  91         TDM_RETURN_VAL_IF_FAIL(private_loop != NULL, TDM_ERROR_OPERATION_FAILED);
  92         TDM_RETURN_VAL_IF_FAIL(private_loop->dpy != NULL, TDM_ERROR_OPERATION_FAILED);
  93
  94         ret = tdm_thread_handle_cb(private_loop);
  95
  96         TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, ret);
  97
  98         return TDM_ERROR_NONE;
  99 }
 100
 101 static void*
 102 _tdm_thread_main(void *data)
 103 {
 104         tdm_private_thread *private_thread = (tdm_private_thread*)data;
 105         tdm_private_loop *private_loop = private_thread->private_loop;
 106         int fd;
 107         struct pollfd fds;
 108         int ret;
 109         tdm_error error;
 110
 111         /* Not lock/unlock for the private_thread and private_loop structure
 112          * because they won't be destroyed as long as tdm thread is running.
 113          * When they're destroyed, we have already exit the tdm thread.
 114          */
 115         private_thread->thread_tid = syscall(SYS_gettid);
 116
 117         TDM_INFO("display_tid:%d, thread_tid: %d",
 118                          private_thread->display_tid, private_thread->thread_tid);
 119
 120         /* fd SHOULD be the same with sub_pipe[0] to make sure that using
 121          * tdm_thread_get_fd, tdm_thread_send_cb, tdm_thread_handle_cb in
 122          * both threads is fine. Otherwise, assert.
 123          */
 124         tdm_display_lock(private_loop->dpy);
 125         assert(tdm_thread_get_fd(private_loop) == private_thread->sub_pipe[0]);
 126
 127         private_thread->sub_event_source =
 128                 tdm_event_loop_add_fd_handler(private_loop->dpy,
 129                                                                           private_thread->sub_pipe[0],
 130                                                                           TDM_EVENT_LOOP_READABLE,
 131                                                                           _tdm_thread_handle_events,
 132                                                                           private_loop,
 133                                                                           &error);
 134         TDM_GOTO_IF_FAIL(error == TDM_ERROR_NONE, exit_thread);
 135         TDM_GOTO_IF_FAIL(private_thread->sub_event_source != NULL, exit_thread);
 136
 137         pthread_cond_signal(&private_thread->event_cond);
 138
 139         /* mutex shall be locked by the thread calling pthread_cond_signal() */
 140         tdm_display_unlock(private_loop->dpy);
 141
 142         fd = tdm_event_loop_get_fd(private_loop->dpy);
 143         if (fd < 0) {
 144                 TDM_ERR("couldn't get fd");
 145                 goto exit_thread;
 146         }
 147
 148         fds.events = POLLIN;
 149         fds.fd = fd;
 150         fds.revents = 0;
 151
 152         while (1) {
 153                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 154                         TDM_INFO("server flush");
 155                 tdm_event_loop_flush(private_loop->dpy);
 156
 157                 if (private_thread->event_thread_exit)
 158                         break;
 159
 160                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 161                         TDM_INFO("fd(%d) polling in", fd);
 162
 163                 ret = poll(&fds, 1, -1);
 164
 165                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 166                         TDM_INFO("fd(%d) polling out", fd);
 167
 168                 if (ret < 0) {
 169                         if (errno == EINTR || errno == EAGAIN)  /* normal case */
 170                                 continue;
 171                         else {
 172                                 TDM_ERR("poll failed: %m");
 173                                 goto exit_thread;
 174                         }
 175                 }
 176
 177                 if (tdm_debug_module & TDM_DEBUG_EVENT)
 178                         TDM_INFO("thread got events");
 179
 180                 if (tdm_event_loop_dispatch(private_loop->dpy) < 0)
 181                         TDM_ERR("dispatch error");
 182         }
 183
 184 exit_thread:
 185         tdm_display_unlock(private_loop->dpy);
 186         pthread_exit(NULL);
 187 }
 188
 189 static tdm_error
 190 _tdm_thread_exit(tdm_private_loop *private_loop)
 191 {
 192         tdm_thread_cb_base cb_base;
 193         tdm_error ret;
 194
 195         memset(&cb_base, 0, sizeof cb_base);
 196         cb_base.type = TDM_THREAD_CB_EXIT;
 197         cb_base.length = sizeof cb_base;
 198
 199         ret = tdm_thread_send_cb(private_loop, &cb_base);
 200         TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, ret);
 201
 202         return ret;
 203 }
 204
 205 /* NOTE: tdm thread doesn't care about multi-thread. */
 206 INTERN tdm_error
 207 tdm_thread_init(tdm_private_loop *private_loop)
 208 {
 209         tdm_private_display *private_display;
 210         tdm_private_thread *private_thread;
 211         int thread, i;
 212
 213         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 214         TDM_RETURN_VAL_IF_FAIL(private_loop->dpy, TDM_ERROR_OPERATION_FAILED);
 215
 216         private_display = private_loop->dpy;
 217         TDM_RETURN_VAL_IF_FAIL(private_display->private_loop, TDM_ERROR_OPERATION_FAILED);
 218
 219         if (private_loop->private_thread)
 220                 return TDM_ERROR_NONE;
 221
 222         for (i = 0; i < TDM_THREAD_CB_MAX; i++)
 223                 find_funcs[i] = NULL;
 224
 225         LIST_INITHEAD(&cb_list[0]);
 226         LIST_INITHEAD(&cb_list[1]);
 227
 228         /* enable as default */
 229         thread = tdm_config_get_int(TDM_CONFIG_KEY_GENERAL_THREAD, 1);
 230         if (!thread) {
 231                 TDM_INFO("not using a TDM event thread");
 232                 return TDM_ERROR_NONE;
 233         }
 234
 235         private_thread = calloc(1, sizeof * private_thread);
 236         if (!private_thread) {
 237                 TDM_ERR("alloc failed");
 238                 return TDM_ERROR_OUT_OF_MEMORY;
 239         }
 240
 241         if (pthread_cond_init(&private_thread->event_cond, NULL)) {
 242                 TDM_ERR("pthread_cond_init failed: %m");
 243                 free(private_thread);
 244                 return TDM_ERROR_OUT_OF_MEMORY;
 245         }
 246
 247         if (pipe(private_thread->pipe) != 0) {
 248                 TDM_ERR("pipe failed: %m");
 249                 pthread_cond_destroy(&private_thread->event_cond);
 250                 free(private_thread);
 251                 return TDM_ERROR_OPERATION_FAILED;
 252         }
 253
 254         if (pipe(private_thread->sub_pipe) != 0) {
 255                 TDM_ERR("sub_pipe failed: %m");
 256                 close(private_thread->pipe[0]);
 257                 close(private_thread->pipe[1]);
 258                 pthread_cond_destroy(&private_thread->event_cond);
 259                 free(private_thread);
 260                 return TDM_ERROR_OPERATION_FAILED;
 261         }
 262
 263         keep_private_thread = private_thread;
 264
 265         private_thread->private_loop = private_loop;
 266         private_loop->private_thread = private_thread;
 267
 268         private_thread->display_tid = syscall(SYS_gettid);
 269
 270         /* pthread_cond_wait atomically release mutex, Upon successful return,
 271          * the mutex shall have been locked and shall be owned by the calling thread
 272          */
 273         tdm_mutex_locked = 0;
 274         pthread_create(&private_thread->event_thread, NULL, _tdm_thread_main,
 275                                    private_thread);
 276
 277         /* wait until the tdm thread starts */
 278         pthread_cond_wait(&private_thread->event_cond, &private_display->lock);
 279         tdm_mutex_locked = 1;
 280
 281         TDM_INFO("using a TDM event thread. pipe(%d,%d) sub_pipe(%d,%d)",
 282                          private_thread->pipe[0], private_thread->pipe[1],
 283                          private_thread->sub_pipe[0], private_thread->sub_pipe[1]);
 284
 285         return TDM_ERROR_NONE;
 286 }
 287
 288 INTERN void
 289 tdm_thread_deinit(tdm_private_loop *private_loop)
 290 {
 291         tdm_private_display *private_display;
 292         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 293         tdm_error ret;
 294
 295         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 296
 297         if (!private_loop->private_thread)
 298                 return;
 299
 300         ret = _tdm_thread_exit(private_loop);
 301         if (ret != TDM_ERROR_NONE)
 302                 pthread_cancel(private_loop->private_thread->event_thread);
 303
 304         private_display = private_loop->dpy;
 305
 306         /* before falling into the block of pthread_join, we have to unlock the mutex
 307          * for subthread to use the mutex.
 308          */
 309         _pthread_mutex_unlock(&private_display->lock);
 310         pthread_join(private_loop->private_thread->event_thread, NULL);
 311         private_loop->private_thread->event_thread_joined = 1;
 312         TDM_INFO("Joined a TDM event thread");
 313
 314         pthread_mutex_unlock(&cb_list_lock);
 315         tdm_log_reset();
 316
 317         if (private_loop->private_thread->sub_event_source)
 318                 tdm_event_loop_source_remove(private_loop->private_thread->sub_event_source);
 319
 320         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list[0], link) {
 321                 _tdm_thread_free_cb(cb);
 322         }
 323         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &cb_list[1], link) {
 324                 _tdm_thread_free_cb(cb);
 325         }
 326
 327         if (private_loop->private_thread->pipe[0] >= 0)
 328                 close(private_loop->private_thread->pipe[0]);
 329         if (private_loop->private_thread->pipe[1] >= 0)
 330                 close(private_loop->private_thread->pipe[1]);
 331
 332         if (private_loop->private_thread->sub_pipe[0] >= 0)
 333                 close(private_loop->private_thread->sub_pipe[0]);
 334         if (private_loop->private_thread->sub_pipe[1] >= 0)
 335                 close(private_loop->private_thread->sub_pipe[1]);
 336
 337         pthread_cond_destroy(&private_loop->private_thread->event_cond);
 338
 339         free(private_loop->private_thread);
 340         private_loop->private_thread = NULL;
 341         keep_private_thread = NULL;
 342
 343         TDM_INFO("Finish a TDM event thread");
 344 }
 345
 346 INTERN int
 347 tdm_thread_get_fd(tdm_private_loop *private_loop)
 348 {
 349         tdm_private_thread *private_thread;
 350         int in_main;
 351
 352         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 353         TDM_RETURN_VAL_IF_FAIL(private_loop, -1);
 354         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, -1);
 355
 356         private_thread = private_loop->private_thread;
 357
 358         /* seems like ticky. but easy way to use the same APIs for both threads */
 359         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 360
 361         if (in_main)
 362                 return private_thread->pipe[0];
 363         else
 364                 return private_thread->sub_pipe[0];
 365 }
 366
 367 INTERN tdm_error
 368 tdm_thread_send_cb(tdm_private_loop *private_loop, tdm_thread_cb_base *base)
 369 {
 370         tdm_private_thread *private_thread;
 371         ssize_t len;
 372         int pipe, in_main;
 373
 374         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 375         TDM_RETURN_VAL_IF_FAIL(base, TDM_ERROR_INVALID_PARAMETER);
 376         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 377         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 378
 379         private_thread = private_loop->private_thread;
 380
 381         /* seems like ticky. but easy way to use the same APIs for both threads */
 382         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 383
 384         if (in_main)
 385                 pipe = private_thread->sub_pipe[1];
 386         else
 387                 pipe = private_thread->pipe[1];
 388
 389         if (tdm_debug_module & TDM_DEBUG_THREAD)
 390                 TDM_INFO("fd(%d) type(%s), length(%d)", pipe, tdm_cb_type_str(base->type), base->length);
 391
 392         len = write(pipe, base, base->length);
 393         if (len != base->length) {
 394                 TDM_ERR("write failed (%d != %d): %m", (int)len, base->length);
 395                 return TDM_ERROR_OPERATION_FAILED;
 396         }
 397
 398         if (tdm_debug_module & TDM_DEBUG_THREAD)
 399                 TDM_INFO("[%s] write fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 400
 401         return TDM_ERROR_NONE;
 402 }
 403
 404 INTERN tdm_error
 405 tdm_thread_handle_cb(tdm_private_loop *private_loop)
 406 {
 407         tdm_private_thread *private_thread;
 408         tdm_thread_cb_base *base;
 409         char buffer[1024];
 410         unsigned int i;
 411         int len, pipe, in_main;
 412         tdm_error ret = TDM_ERROR_NONE;
 413
 414         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 415         TDM_RETURN_VAL_IF_FAIL(private_loop, TDM_ERROR_INVALID_PARAMETER);
 416         TDM_RETURN_VAL_IF_FAIL(private_loop->private_thread, TDM_ERROR_INVALID_PARAMETER);
 417
 418         private_thread = private_loop->private_thread;
 419
 420         /* seems like ticky. but easy way to use the same APIs for both threads */
 421         in_main = tdm_thread_in_display_thread(syscall(SYS_gettid));
 422
 423         if (in_main)
 424                 pipe = private_thread->pipe[0];
 425         else
 426                 pipe = private_thread->sub_pipe[0];
 427
 428         do {
 429                 len = read(pipe, buffer, sizeof buffer);
 430         } while (len < 0 && errno == EINTR);
 431
 432         if (tdm_debug_module & TDM_DEBUG_THREAD)
 433                 TDM_INFO("[%s] read fd(%d) length(%d)", (in_main) ? "main" : "sub", pipe, len);
 434
 435         if (len < 0) {
 436                 TDM_ERR("read failed: errno(%d), len(%d) %m", errno, len);
 437                 return TDM_ERROR_OPERATION_FAILED;
 438         }
 439
 440         if (len == 0)
 441                 return TDM_ERROR_NONE;
 442
 443         if (len < sizeof * base) {
 444                 TDM_ERR("read failed: len(%d)", len);
 445                 return TDM_ERROR_OPERATION_FAILED;
 446         }
 447
 448         i = 0;
 449         while (i < len) {
 450                 base = (tdm_thread_cb_base*)&buffer[i];
 451                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 452                         TDM_INFO("type(%s), length(%d)", tdm_cb_type_str(base->type), base->length);
 453                 switch (base->type) {
 454                 case TDM_THREAD_CB_OUTPUT_COMMIT:
 455                 case TDM_THREAD_CB_OUTPUT_VBLANK:
 456                 case TDM_THREAD_CB_OUTPUT_STATUS:
 457                 case TDM_THREAD_CB_OUTPUT_DPMS:
 458                 case TDM_THREAD_CB_PP_DONE:
 459                 case TDM_THREAD_CB_CAPTURE_DONE:
 460                 case TDM_THREAD_CB_VBLANK_SW:
 461                 case TDM_THREAD_CB_VBLANK_CREATE:
 462                 case TDM_THREAD_CB_HWC_COMMIT:
 463                         /* this event comes from other thread. so we don't need to propagate this to other thread */
 464                         ret = tdm_thread_cb_call(NULL, base, 0);
 465                         TDM_WARNING_IF_FAIL(ret == TDM_ERROR_NONE);
 466                         break;
 467                 case TDM_THREAD_CB_EXIT:
 468                         private_thread->event_thread_exit = 1;
 469                         break;
 470                 default:
 471                         break;
 472                 }
 473                 i += base->length;
 474         }
 475
 476         return TDM_ERROR_NONE;
 477 }
 478
 479 INTERN int
 480 tdm_thread_in_display_thread(pid_t tid)
 481 {
 482         if (!keep_private_thread)
 483                 return 1;
 484
 485         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 486
 487         return (keep_private_thread->display_tid == tid) ? 1 : 0;
 488 }
 489
 490 INTERN int
 491 tdm_thread_is_running(void)
 492 {
 493         /* DON'T check TDM_MUTEX_IS_LOCKED here */
 494
 495         return (keep_private_thread && !keep_private_thread->event_thread_joined) ? 1 : 0;
 496 }
 497
 498 static void
 499 _tdm_thread_free_cb(tdm_private_thread_cb *cb)
 500 {
 501         if (tdm_debug_module & TDM_DEBUG_THREAD)
 502                 TDM_INFO("cb(%p) removed", cb);
 503
 504         assert(LIST_IS_EMPTY(&cb->call_link));
 505
 506         LIST_DEL(&cb->link);
 507         free(cb);
 508 }
 509
 510 static tdm_private_thread_cb *
 511 _tdm_thread_find_cb(struct list_head *list, void *object, tdm_thread_cb_type cb_type,
 512                                         void *cb_data, tdm_thread_cb func, void *user_data)
 513 {
 514         tdm_private_thread_cb *cb = NULL;
 515
 516         LIST_FOR_EACH_ENTRY(cb, list, link) {
 517                 if (cb->object == object &&
 518                         cb->cb_type == cb_type &&
 519                         cb->cb_data == cb_data &&
 520                         cb->func == func &&
 521                         cb->user_data == user_data)
 522                         return cb;
 523         }
 524
 525         return NULL;
 526 }
 527
 528 INTERN void
 529 tdm_thread_cb_set_find_func(tdm_thread_cb_type cb_type, tdm_thread_find_object func)
 530 {
 531         TDM_RETURN_IF_FAIL(cb_type > 0);
 532
 533         if (func && find_funcs[cb_type])
 534                 TDM_NEVER_GET_HERE();
 535
 536         find_funcs[cb_type] = func;
 537 }
 538
 539 INTERN tdm_error
 540 tdm_thread_cb_add(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 541 {
 542         tdm_private_thread_cb *cb = NULL;
 543         pid_t caller_tid;
 544         struct list_head *list;
 545
 546         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 547         TDM_RETURN_VAL_IF_FAIL(object != NULL, TDM_ERROR_INVALID_PARAMETER);
 548         TDM_RETURN_VAL_IF_FAIL(cb_type > 0, TDM_ERROR_INVALID_PARAMETER);
 549         TDM_RETURN_VAL_IF_FAIL(func != NULL, TDM_ERROR_INVALID_PARAMETER);
 550
 551         caller_tid = syscall(SYS_gettid);
 552
 553         pthread_mutex_lock(&cb_list_lock);
 554
 555         if (tdm_thread_in_display_thread(caller_tid))
 556                 list = &cb_list[0];
 557         else
 558                 list = &cb_list[1];
 559
 560         cb = _tdm_thread_find_cb(list, object, cb_type, cb_data, func, user_data);
 561         if (cb) {
 562                 pthread_mutex_unlock(&cb_list_lock);
 563                 TDM_ERR("can't be added twice with same data");
 564                 return TDM_ERROR_BAD_REQUEST;
 565         }
 566
 567         cb = calloc(1, sizeof *cb);
 568         if (!cb) {
 569                 pthread_mutex_unlock(&cb_list_lock);
 570                 TDM_ERR("calloc failed");
 571                 return TDM_ERROR_OUT_OF_MEMORY;
 572         }
 573
 574         LIST_ADDTAIL(&cb->link, list);
 575         LIST_INITHEAD(&cb->call_link);
 576
 577         cb->object = object;
 578         cb->cb_type = cb_type;
 579         cb->cb_data = cb_data;
 580         cb->func = func;
 581         cb->user_data = user_data;
 582         cb->owner_tid = caller_tid;
 583
 584         if (tdm_debug_module & TDM_DEBUG_THREAD)
 585                 TDM_INFO("cb_type(%s) cb(%p) added", tdm_cb_type_str(cb_type), cb);
 586
 587         pthread_mutex_unlock(&cb_list_lock);
 588
 589         return TDM_ERROR_NONE;
 590 }
 591
 592 INTERN void
 593 tdm_thread_cb_remove(void *object, tdm_thread_cb_type cb_type, void *cb_data, tdm_thread_cb func, void *user_data)
 594 {
 595         tdm_private_thread_cb *cb;
 596         struct list_head *list;
 597
 598         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 599         TDM_RETURN_IF_FAIL(object != NULL);
 600         TDM_RETURN_IF_FAIL(cb_type > 0);
 601         TDM_RETURN_IF_FAIL(func != NULL);
 602
 603         pthread_mutex_lock(&cb_list_lock);
 604
 605         list = &cb_list[0];
 606         cb = _tdm_thread_find_cb(list, object, cb_type, cb_data, func, user_data);
 607         if (cb)
 608                 _tdm_thread_free_cb(cb);
 609
 610         list = &cb_list[1];
 611         cb = _tdm_thread_find_cb(list, object, cb_type, cb_data, func, user_data);
 612         if (cb)
 613                 _tdm_thread_free_cb(cb);
 614
 615         pthread_mutex_unlock(&cb_list_lock);
 616 }
 617
 618 /* when call a callback, we check both cb_base's type and cb_base's data,
 619  * because a callback is added with cb_type and cb_data.
 620  */
 621 INTERN tdm_error
 622 tdm_thread_cb_call(void *object, tdm_thread_cb_base *cb_base, unsigned int propagation)
 623 {
 624         tdm_private_display *private_display = tdm_display_get();
 625         tdm_private_thread_cb *cb = NULL, *hh = NULL;
 626         int handler_in_other_thread = 0;
 627         pid_t caller_tid;
 628         struct list_head *list, *other_list;
 629         struct list_head call_list;
 630         static pid_t waiting_tid = 0;
 631         tdm_error ret;
 632
 633         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), TDM_ERROR_OPERATION_FAILED);
 634         TDM_RETURN_VAL_IF_FAIL(cb_base != NULL, TDM_ERROR_INVALID_PARAMETER);
 635         TDM_RETURN_VAL_IF_FAIL(cb_base->type > 0, TDM_ERROR_INVALID_PARAMETER);
 636         TDM_RETURN_VAL_IF_FAIL(cb_base->length > 0, TDM_ERROR_INVALID_PARAMETER);
 637         TDM_RETURN_VAL_IF_FAIL(cb_base->object_stamp > 0, TDM_ERROR_INVALID_PARAMETER);
 638
 639         caller_tid = syscall(SYS_gettid);
 640
 641         assert(find_funcs[cb_base->type] != NULL);
 642
 643         if (keep_private_thread && keep_private_thread->thread_tid != caller_tid) {
 644                 /* A sync-type event from display-thread to tdm-thread can't be handled.
 645                  * If sync-type events happen in both threads at the same time,
 646                  * it would make a deadlock issue.
 647                  */
 648                 assert(cb_base->sync != 1);
 649         }
 650
 651         if (tdm_debug_module & TDM_DEBUG_THREAD)
 652                 TDM_INFO("'%s' thread_cb (sync:%d, propagation:%d) ------",
 653                                  tdm_cb_type_str(cb_base->type), cb_base->sync, propagation);
 654
 655         if (!object) {
 656                 object = find_funcs[cb_base->type](private_display, cb_base->object_stamp);
 657                 if (!object) {
 658                         TDM_WRN("%p gone", object);
 659                         return TDM_ERROR_NONE;
 660                 }
 661         }
 662
 663         pthread_mutex_lock(&cb_list_lock);
 664
 665         if (tdm_thread_in_display_thread(caller_tid)) {
 666                 list = &cb_list[0];
 667                 other_list = &cb_list[1];
 668         } else {
 669                 other_list = &cb_list[0];
 670                 list = &cb_list[1];
 671         }
 672
 673         LIST_INITHEAD(&call_list);
 674
 675         LIST_FOR_EACH_ENTRY_SAFE(cb, hh, list, link) {
 676                 if (cb->object != object ||
 677                         cb->cb_type != cb_base->type ||
 678                         cb->cb_data != cb_base->data)
 679                         continue;
 680
 681                 LIST_ADDTAIL(&cb->call_link, &call_list);
 682         }
 683
 684         if (!LIST_IS_EMPTY(&call_list)) {
 685                 LIST_FOR_EACH_ENTRY_SAFE(cb, hh, &call_list, call_link) {
 686                         LIST_DELINIT(&cb->call_link);
 687                         if (tdm_debug_module & TDM_DEBUG_THREAD)
 688                                 TDM_INFO("cb_type(%s) cb(%p) calling", tdm_cb_type_str(cb->cb_type), cb);
 689                         pthread_mutex_unlock(&cb_list_lock);
 690                         cb->func(private_display, cb->object, cb_base, cb->user_data);
 691                         pthread_mutex_lock(&cb_list_lock);
 692                 }
 693         }
 694
 695         pthread_mutex_unlock(&cb_list_lock);
 696
 697         if (propagation) {
 698                 LIST_FOR_EACH_ENTRY_SAFE(cb, hh, other_list, link) {
 699                         if (cb->object != object ||
 700                                 cb->cb_type != cb_base->type ||
 701                                 cb->cb_data != cb_base->data)
 702                                 continue;
 703
 704                         handler_in_other_thread = 1;
 705                         break;
 706                 }
 707         }
 708
 709         if (!handler_in_other_thread) {
 710                 if (keep_private_thread) {
 711                         /* NOTE quick fix
 712                          * In case of 'cb_base->sync = 0' and 'waiting_tid != 0',
 713                          * probably it means one thread is waiting for signal of
 714                          * pthread condition.
 715                          */
 716                         if (!cb_base->sync && waiting_tid != 0) {
 717                                 waiting_tid = 0;
 718                                 pthread_cond_signal(&keep_private_thread->event_cond);
 719                                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 720                                         TDM_INFO("pthread broadcase");
 721                         }
 722                 }
 723                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 724                         TDM_INFO("'%s' thread_cb (sync:%d, propagation:%d) ------...",
 725                                          tdm_cb_type_str(cb_base->type), cb_base->sync, propagation);
 726                 return TDM_ERROR_NONE;
 727         }
 728
 729         /* Once we reach here, it means that keep_private_thread is not NULL.
 730          * Just make the crash. Avoiding it is not going to help us.
 731          */
 732         assert(keep_private_thread != NULL);
 733
 734         if (!cb_base->sync) {
 735                 ret = tdm_thread_send_cb(private_display->private_loop, cb_base);
 736                 TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, TDM_ERROR_OPERATION_FAILED);
 737         }
 738         /* waiting until all cb are done in another thread */
 739         else {
 740                 /* NOTE quick fix
 741                  * Sync type event from display-thread(main thread) can't be
 742                  * handled. In this way, if we call tdm_thread_send_cb() with
 743                  * 'cb_base->sync = 1', then libtdm will eveventually raise
 744                  * abort(). Please see commit '4abfab36' for more detail.
 745                  */
 746                 cb_base->sync = 0;
 747                 ret = tdm_thread_send_cb(private_display->private_loop, cb_base);
 748                 TDM_RETURN_VAL_IF_FAIL(ret == TDM_ERROR_NONE, TDM_ERROR_OPERATION_FAILED);
 749                 cb_base->sync = 1;
 750
 751                 /* if waiting_tid is not 0, it means there are two sync-type events at the same time.
 752                  * and it would make deadlock issue.
 753                  */
 754                 assert(waiting_tid == 0);
 755
 756                 if (tdm_debug_module & TDM_DEBUG_THREAD)
 757                         TDM_INFO("pthread wait");
 758
 759                 /* pthread_cond_wait atomically release mutex, Upon successful return,
 760                  * the mutex shall have been locked and shall be owned by the calling thread
 761                  */
 762                 tdm_mutex_locked = 0;
 763                 waiting_tid = caller_tid;
 764                 pthread_cond_wait(&keep_private_thread->event_cond, &private_display->lock);
 765                 tdm_mutex_locked = 1;
 766         }
 767
 768         if (tdm_debug_module & TDM_DEBUG_THREAD)
 769                 TDM_INFO("'%s' thread_cb (sync:%d, propagation:%d) ------...",
 770                                  tdm_cb_type_str(cb_base->type), cb_base->sync, propagation);
 771
 772         return TDM_ERROR_NONE;
 773 }