smatz@9343: /* $Id$ */
smatz@9343: 
rubidium@10429: /** @file oldpool_func.h Functions related to the old pool. */
rubidium@10429: 
smatz@9343: #ifndef OLDPOOL_FUNC_H
rubidium@10429: #define OLDPOOL_FUNC_H
smatz@9343: 
smatz@9343: #include "oldpool.h"
smatz@9343: 
smatz@9343: /**
smatz@9343:  * Allocate a pool item; possibly allocate a new block in the pool.
smatz@9343:  * @param first the first pool item to start searching
smatz@9343:  * @pre first <= Tpool->GetSize()
smatz@9343:  * @return the allocated pool item (or NULL when the pool is full).
smatz@9343:  */
smatz@9343: template<typename T, typename Tid, OldMemoryPool<T> *Tpool> T *PoolItem<T, Tid, Tpool>::AllocateSafeRaw(uint &first)
smatz@9343: {
smatz@9343: 	uint last_minus_one = Tpool->GetSize() - 1;
smatz@9343: 
smatz@9343: 	for (T *t = Tpool->Get(first); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {
smatz@9343: 		if (!t->IsValid()) {
smatz@9343: 			first = t->index;
smatz@9343: 			Tid index = t->index;
smatz@9343: 
smatz@9343: 			memset(t, 0, Tpool->item_size);
smatz@9343: 			t->index = index;
smatz@9343: 			return t;
smatz@9343: 		}
smatz@9343: 	}
smatz@9343: 
smatz@9343: 	/* Check if we can add a block to the pool */
smatz@9343: 	if (Tpool->AddBlockToPool()) return AllocateRaw(first);
smatz@9343: 
smatz@9343: 	return NULL;
smatz@9343: }
smatz@9343: 
rubidium@10316: /**
rubidium@10316:  * Check whether we can allocate an item in this pool. This to prevent the
rubidium@10316:  * need to actually construct the object and then destructing it again,
rubidium@10316:  * which could be *very* costly.
rubidium@10316:  * @return true if and only if at least ONE item can be allocated.
rubidium@10316:  */
rubidium@10316: template<typename T, typename Tid, OldMemoryPool<T> *Tpool> bool PoolItem<T, Tid, Tpool>::CanAllocateItem()
rubidium@10316: {
rubidium@10316: 	uint last_minus_one = Tpool->GetSize() - 1;
rubidium@10316: 
rubidium@10316: 	for (T *t = Tpool->Get(Tpool->first_free_index); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {
rubidium@10316: 		if (!t->IsValid()) return true;
rubidium@10316: 		Tpool->first_free_index = t->index;
rubidium@10316: 	}
rubidium@10316: 
rubidium@10316: 	/* Check if we can add a block to the pool */
rubidium@10316: 	if (Tpool->AddBlockToPool()) return CanAllocateItem();
rubidium@10316: 
rubidium@10316: 	return false;
rubidium@10316: }
rubidium@10316: 
smatz@9343: #endif /* OLDPOOL_FUNC_H */