Function unlink_from_queue

mysys/mf_keycache.c:826–850

*/

static void unlink_from_queue(KEYCACHE_WQUEUE *wqueue,
                                     struct st_my_thread_var *thread)
{
  KEYCACHE_DBUG_PRINT("unlink_from_queue", ("thread %ld", thread->id));
  DBUG_ASSERT(thread->next && thread->prev);
  if (thread->next == thread)
    /* The queue contains only one member */
    wqueue->last_thread= NULL;
  else
  {
    thread->next->prev= thread->prev;
    *thread->prev=thread->next;
    if (wqueue->last_thread == thread)
      wqueue->last_thread= STRUCT_PTR(struct st_my_thread_var, next,
                                      thread->prev);
  }
  thread->next= NULL;
#if !defined(DBUG_OFF)
  /*
    This makes it easier to see it's not in a chain during debugging.
    And some DBUG_ASSERT() rely on it.
  */
  thread->prev= NULL;
#endif
}


/*