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int tas(int *lock)//Õâ¸öº¯ÊýÊÇÓÃÀ´¡°Ã¦µÈ´ý¡±µÄ
{
  int retval;
  retval = *lock;
  *lock = 1;
  return retval;
}


void down(semaphore_t *s)
{
  for(;;)
  {
      while(tas(&lock));
      if(*s > 0)
      {
        *(s)--;
        break;
      }
      lock = 0;
  }
  lock = 0;
}

void up(semaphore_t *s)
{
  while(tas(&lock));
  *(s)++;
  lock = 0;

}

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