/**
* @brief Allocate a variable sized object on the memory pool.
* @param pool The pool to allocate from.
* @param size The size of the object to allocate.
* @return A valid address on success, NULL on failure.
*/
void *lpx_mempool_variable_alloc(lpx_mempool_variable_t *pool, long size)
{
void *candidateBlock = NULL;
int unlockNeeded = 0;
if (UNLIKELY(pool == NULL)) {
return NULL;
}
// Lock the mutex if needed.
if (pool->poolMutex != NULL) {
if (0 != pthread_mutex_lock(pool->poolMutex)) {
return NULL;
}
unlockNeeded = 1;
}
// First off, adjust the size to accomodate the metadata.
size += MEMPOOL_PER_BLOCK_OVERHEAD;
if (size < 3 * sizeof(long)) {
// Because this should be linkable back into the list.
size += 3 * sizeof(long);
}
// Find the first fit block from the free list.
candidateBlock = findFirstFit(pool, size);
if (candidateBlock == NULL) {
if (unlockNeeded) {
pthread_mutex_unlock(pool->poolMutex);
}
return NULL;
}
// Split the block and re-link the free list.
candidateBlock = splitBlock(pool, candidateBlock, &size);
if (candidateBlock == NULL) {
if (unlockNeeded) {
pthread_mutex_lock(pool->poolMutex);
}
return NULL;
}
// Prep the block for return.
((long *)candidateBlock)[0] = (long)pool;
((long *)candidateBlock)[1] = size;
// Unlock the mutex if needed.
if (pool->poolMutex != NULL) {
if (0 != pthread_mutex_unlock(pool->poolMutex)) {
return NULL;
}
}
// &candidateBlock[2] is the start of the user memory block.
return &(((long *)candidateBlock)[2]);
}
void *my_malloc(size_t size)
{
freeBlockHotfix();
if(size == 0)
{
return NULL;
}
else if(size < 0)
{
return (void *) -1;
}
else
{
return findFirstFit(size);
}
}