ref: 80465dae8811f8d62742d592b92e641a0ca0c9d9
dir: /vpx_mem/memory_manager/hmm_alloc.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/* This code is in the public domain.
** Version: 1.1 Author: Walt Karas
*/
#include "hmm_intrnl.h"
void *U(alloc)(U(descriptor) *desc, U(size_aau) n) {
#ifdef HMM_AUDIT_FAIL
if (desc->avl_tree_root)
AUDIT_BLOCK(PTR_REC_TO_HEAD(desc->avl_tree_root))
#endif
if (desc->last_freed) {
#ifdef HMM_AUDIT_FAIL
AUDIT_BLOCK(desc->last_freed)
#endif
U(into_free_collection)(desc, (head_record *)(desc->last_freed));
desc->last_freed = 0;
}
/* Add space for block header. */
n += HEAD_AAUS;
/* Convert n from number of address alignment units to block alignment
** units. */
n = DIV_ROUND_UP(n, HMM_BLOCK_ALIGN_UNIT);
if (n < MIN_BLOCK_BAUS)
n = MIN_BLOCK_BAUS;
{
/* Search for the first node of the bin containing the smallest
** block big enough to satisfy request. */
ptr_record *ptr_rec_ptr =
U(avl_search)(
(U(avl_avl) *) & (desc->avl_tree_root), (U(size_bau)) n,
AVL_GREATER_EQUAL);
/* If an approprate bin is found, satisfy the allocation request,
** otherwise return null pointer. */
return(ptr_rec_ptr ?
U(alloc_from_bin)(desc, ptr_rec_ptr, (U(size_bau)) n) : 0);
}
}