1

/* $Id$ */

     2

     3

#ifndef OLDPOOL_FUNC_H

     4

     5

#include "oldpool.h"

     6

     7

/**

     8

 * Allocate a pool item; possibly allocate a new block in the pool.

     9

 * @param first the first pool item to start searching

    10

 * @pre first <= Tpool->GetSize()

    11

 * @return the allocated pool item (or NULL when the pool is full).

    12

 */

    13

template<typename T, typename Tid, OldMemoryPool<T> *Tpool> T *PoolItem<T, Tid, Tpool>::AllocateSafeRaw(uint &first)

    14

{

    15

	uint last_minus_one = Tpool->GetSize() - 1;

    16

    17

	for (T *t = Tpool->Get(first); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {

    18

		if (!t->IsValid()) {

    19

			first = t->index;

    20

			Tid index = t->index;

    21

    22

			memset(t, 0, Tpool->item_size);

    23

			t->index = index;

    24

			return t;

    25

		}

    26

	}

    27

    28

	/* Check if we can add a block to the pool */

    29

	if (Tpool->AddBlockToPool()) return AllocateRaw(first);

    30

    31

	return NULL;

    32

}

    33

    34

/**

    35

 * Check whether we can allocate an item in this pool. This to prevent the

    36

 * need to actually construct the object and then destructing it again,

    37

 * which could be *very* costly.

    38

 * @return true if and only if at least ONE item can be allocated.

    39

 */

    40

template<typename T, typename Tid, OldMemoryPool<T> *Tpool> bool PoolItem<T, Tid, Tpool>::CanAllocateItem()

    41

{

    42

	uint last_minus_one = Tpool->GetSize() - 1;

    43

    44

	for (T *t = Tpool->Get(Tpool->first_free_index); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {

    45

		if (!t->IsValid()) return true;

    46

		Tpool->first_free_index = t->index;

    47

	}

    48

    49

	/* Check if we can add a block to the pool */

    50

	if (Tpool->AddBlockToPool()) return CanAllocateItem();

    51

    52

	return false;

    53

}

    54

    55

#endif /* OLDPOOL_FUNC_H */