MapBlock * Map::getBlockBuffered(v3s16 & p)
{
MapBlock *block;
{
auto lock = try_shared_lock(m_block_cache_mutex);
if(m_block_cache && p == m_block_cache_p)
return m_block_cache;
}
// If block doesn't exist, return NULL
{
auto lock = m_blocks.lock_shared_rec();
auto n = m_blocks.find(p);
if(n == m_blocks.end())
{
block = NULL;
}
// If block exists, return it
else{
block = n->second;
}
}
// Cache the last result
auto lock = unique_lock(m_block_cache_mutex);
m_block_cache_p = p;
m_block_cache = block;
return block;
}
//TODO: REMOVE THIS func and use Map::getBlock
MapBlock* Map::getBlockNoCreateNoEx(v3POS p, bool trylock, bool nocache) {
#ifndef NDEBUG
ScopeProfiler sp(g_profiler, "Map: getBlock");
#endif
#if !ENABLE_THREADS
nocache = true; //very dirty hack. fix and remove. Also compare speed: no cache and cache with lock
#endif
if (!nocache) {
#if ENABLE_THREADS && !HAVE_THREAD_LOCAL
auto lock = try_shared_lock(m_block_cache_mutex, TRY_TO_LOCK);
if(lock.owns_lock())
#endif
if(m_block_cache && p == m_block_cache_p) {
#ifndef NDEBUG
g_profiler->add("Map: getBlock cache hit", 1);
#endif
return m_block_cache;
}
}
MapBlockP block;
{
auto lock = trylock ? m_blocks.try_lock_shared_rec() : m_blocks.lock_shared_rec();
if (!lock->owns_lock())
return nullptr;
auto n = m_blocks.find(p);
if(n == m_blocks.end())
return nullptr;
block = n->second;
}
if (!nocache) {
#if ENABLE_THREADS && !HAVE_THREAD_LOCAL
auto lock = unique_lock(m_block_cache_mutex, TRY_TO_LOCK);
if(lock.owns_lock())
#endif
{
m_block_cache_p = p;
m_block_cache = block;
}
}
return block;
}
