Method realloc

kernels/subdiv/tessellation_cache.cpp:170–213

  }

  void SharedLazyTessellationCache::realloc(const size_t new_size)
  {
    /* lock the reset_state */
    reset_state.lock();

    /* lock the linked list of thread states */
    linkedlist_mtx.lock();

    /* block all threads */
    for (ThreadWorkState *t=current_t_state;t!=nullptr;t=t->next)
      if (lockThread(t,THREAD_BLOCK_ATOMIC_ADD) != 0)
        waitForUsersLessEqual(t,THREAD_BLOCK_ATOMIC_ADD);

    /* reallocate data */
    if (data) os_free(data,size,hugepages);
    size      = new_size;
    data      = nullptr;
    if (size) data = (float*)os_malloc(size,hugepages);
    maxBlocks = size/BLOCK_SIZE;    

    /* invalidate entire cache */
    localTime += NUM_CACHE_SEGMENTS; 

    /* reset to the first segment */
#if FORCE_SIMPLE_FLUSH == 1
    next_block = 0;
    switch_block_threshold = maxBlocks;
#else
    const size_t region = localTime % NUM_CACHE_SEGMENTS;
    next_block = region * (maxBlocks/NUM_CACHE_SEGMENTS);
    switch_block_threshold = next_block + (maxBlocks/NUM_CACHE_SEGMENTS);
    assert( switch_block_threshold <= maxBlocks );
#endif

    /* release all blocked threads */
    for (ThreadWorkState *t=current_t_state;t!=nullptr;t=t->next)
      unlockThread(t,-THREAD_BLOCK_ATOMIC_ADD);

    /* unlock the linked list of thread states */
    linkedlist_mtx.unlock();	    

    /* unlock the reset_state */
    reset_state.unlock();
  }


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