Question

我在使用信号量实现producent-consumer问题时遇到问题。实际上，输出文件是100％正确 - 与输入文件相同。虽然，在终端我得到疯狂的东西 like...

对我来说，看起来write函数总是返回值20，这就是为什么我不能打破while循环。我一直在考虑解决方案几个小时，我找不到任何...... 如果你有任何想法，请帮助，作为一个新手是如此令人沮丧。

我的消费者代码：

while(1) {
  block_sem(sem_FULL);
    if(((counter = write(outputfile, rb->buffer[rb->tail], DATA_SIZE)) == DATA_SIZE)) { 
    printf("[c] %d bytes of data saved to the output file: %s\n", counter, rb->buffer[rb->tail]);
    rb->tail = (rb->tail + 1) % BUF_SIZE;
    unblock_sem(sem_EMPTY);
  }

  else if(counter < DATA_SIZE) {
    printf("[c] %d bytes of data saved to the output file: %s\n", counter, rb->buffer[rb->tail]);
      unblock_sem(sem_EMPTY);
    break;
  }

  else if(counter == -1) {
    perror("[c] could not write to the output file");
    exit(EXIT_FAILURE);
  }
}

我的制片人：

  while((counter = read(inputfile, Data_in, DATA_SIZE))) {
if(counter == DATA_SIZE) { 
block_sem(sem_EMPTY);
for(j=0; j<DATA_SIZE; j++) {
  rb->buffer[rb->head][j] = Data_in[j];
}
  printf("[p] %d bytes of data saved to the ring buffer: %s\n", counter, rb->buffer[rb->head]);
  rb->head = (rb->head + 1) % BUF_SIZE;
unblock_sem(sem_FULL)  }

if(counter < DATA_SIZE) { 
block_sem(sem_EMPTY);
for(j=0; j<counter; j++) {
  rb->buffer[rb->head][j] = Data_in[j];
}
  rb->buffer[rb->head][counter] = '\0';
  printf("[p] %d bytes of data saved to the ring buffer: %s\n", counter, rb->buffer[rb->head]);
unblock_sem(sem_FULL);
    } }

C - 使用信号量和环形缓冲区的生产者和消费者

0 个答案: