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  1. /*
  2.  * Copyright (c) 2014 Nicolas George
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public License
  8.  * as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.  * GNU Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public License
  17.  * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  18.  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "fifo.h"
  22. #include "threadmessage.h"
  23. #if HAVE_THREADS
  24. #if HAVE_PTHREADS
  25. #include <pthread.h>
  26. #elif HAVE_W32THREADS
  27. #include "compat/w32pthreads.h"
  28. #elif HAVE_OS2THREADS
  29. #include "compat/os2threads.h"
  30. #else
  31. #error "Unknown threads implementation"
  32. #endif
  33. #endif
  34.  
  35. struct AVThreadMessageQueue {
  36. #if HAVE_THREADS
  37.     AVFifoBuffer *fifo;
  38.     pthread_mutex_t lock;
  39.     pthread_cond_t cond;
  40.     int err_send;
  41.     int err_recv;
  42.     unsigned elsize;
  43. #else
  44.     int dummy;
  45. #endif
  46. };
  47.  
  48. int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
  49.                                   unsigned nelem,
  50.                                   unsigned elsize)
  51. {
  52. #if HAVE_THREADS
  53.     AVThreadMessageQueue *rmq;
  54.     int ret = 0;
  55.  
  56.     if (nelem > INT_MAX / elsize)
  57.         return AVERROR(EINVAL);
  58.     if (!(rmq = av_mallocz(sizeof(*rmq))))
  59.         return AVERROR(ENOMEM);
  60.     if ((ret = pthread_mutex_init(&rmq->lock, NULL))) {
  61.         av_free(rmq);
  62.         return AVERROR(ret);
  63.     }
  64.     if ((ret = pthread_cond_init(&rmq->cond, NULL))) {
  65.         pthread_mutex_destroy(&rmq->lock);
  66.         av_free(rmq);
  67.         return AVERROR(ret);
  68.     }
  69.     if (!(rmq->fifo = av_fifo_alloc(elsize * nelem))) {
  70.         pthread_cond_destroy(&rmq->cond);
  71.         pthread_mutex_destroy(&rmq->lock);
  72.         av_free(rmq);
  73.         return AVERROR(ret);
  74.     }
  75.     rmq->elsize = elsize;
  76.     *mq = rmq;
  77.     return 0;
  78. #else
  79.     *mq = NULL;
  80.     return AVERROR(ENOSYS);
  81. #endif /* HAVE_THREADS */
  82. }
  83.  
  84. void av_thread_message_queue_free(AVThreadMessageQueue **mq)
  85. {
  86. #if HAVE_THREADS
  87.     if (*mq) {
  88.         av_fifo_freep(&(*mq)->fifo);
  89.         pthread_cond_destroy(&(*mq)->cond);
  90.         pthread_mutex_destroy(&(*mq)->lock);
  91.         av_freep(mq);
  92.     }
  93. #endif
  94. }
  95.  
  96. #if HAVE_THREADS
  97.  
  98. static int av_thread_message_queue_send_locked(AVThreadMessageQueue *mq,
  99.                                                void *msg,
  100.                                                unsigned flags)
  101. {
  102.     while (!mq->err_send && av_fifo_space(mq->fifo) < mq->elsize) {
  103.         if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
  104.             return AVERROR(EAGAIN);
  105.         pthread_cond_wait(&mq->cond, &mq->lock);
  106.     }
  107.     if (mq->err_send)
  108.         return mq->err_send;
  109.     av_fifo_generic_write(mq->fifo, msg, mq->elsize, NULL);
  110.     pthread_cond_signal(&mq->cond);
  111.     return 0;
  112. }
  113.  
  114. static int av_thread_message_queue_recv_locked(AVThreadMessageQueue *mq,
  115.                                                void *msg,
  116.                                                unsigned flags)
  117. {
  118.     while (!mq->err_recv && av_fifo_size(mq->fifo) < mq->elsize) {
  119.         if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
  120.             return AVERROR(EAGAIN);
  121.         pthread_cond_wait(&mq->cond, &mq->lock);
  122.     }
  123.     if (av_fifo_size(mq->fifo) < mq->elsize)
  124.         return mq->err_recv;
  125.     av_fifo_generic_read(mq->fifo, msg, mq->elsize, NULL);
  126.     pthread_cond_signal(&mq->cond);
  127.     return 0;
  128. }
  129.  
  130. #endif /* HAVE_THREADS */
  131.  
  132. int av_thread_message_queue_send(AVThreadMessageQueue *mq,
  133.                                  void *msg,
  134.                                  unsigned flags)
  135. {
  136. #if HAVE_THREADS
  137.     int ret;
  138.  
  139.     pthread_mutex_lock(&mq->lock);
  140.     ret = av_thread_message_queue_send_locked(mq, msg, flags);
  141.     pthread_mutex_unlock(&mq->lock);
  142.     return ret;
  143. #else
  144.     return AVERROR(ENOSYS);
  145. #endif /* HAVE_THREADS */
  146. }
  147.  
  148. int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
  149.                                  void *msg,
  150.                                  unsigned flags)
  151. {
  152. #if HAVE_THREADS
  153.     int ret;
  154.  
  155.     pthread_mutex_lock(&mq->lock);
  156.     ret = av_thread_message_queue_recv_locked(mq, msg, flags);
  157.     pthread_mutex_unlock(&mq->lock);
  158.     return ret;
  159. #else
  160.     return AVERROR(ENOSYS);
  161. #endif /* HAVE_THREADS */
  162. }
  163.  
  164. void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
  165.                                           int err)
  166. {
  167. #if HAVE_THREADS
  168.     pthread_mutex_lock(&mq->lock);
  169.     mq->err_send = err;
  170.     pthread_cond_broadcast(&mq->cond);
  171.     pthread_mutex_unlock(&mq->lock);
  172. #endif /* HAVE_THREADS */
  173. }
  174.  
  175. void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
  176.                                           int err)
  177. {
  178. #if HAVE_THREADS
  179.     pthread_mutex_lock(&mq->lock);
  180.     mq->err_recv = err;
  181.     pthread_cond_broadcast(&mq->cond);
  182.     pthread_mutex_unlock(&mq->lock);
  183. #endif /* HAVE_THREADS */
  184. }
  185.