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/*
* Purpose: OSS memory block allocation and management routines.
*/
/*
*
* This file is part of Open Sound System.
*
* Copyright (C) 4Front Technologies 1996-2008.
*
* This this source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
*/
#include <oss_config.h>
struct _oss_memblk_t
{
oss_memblk_t *next;
void *addr;
};
oss_memblk_t *oss_global_memblk=NULL;
void
*oss_memblk_malloc(oss_memblk_t **blk, int size)
{
oss_memblk_t *newblk;
newblk = KERNEL_MALLOC (sizeof(oss_memblk_t) + size);
newblk->addr = newblk +1;
newblk->next = NULL;
if (*blk == NULL)
{
/*
* No earlier memory blocks in the chain.
*/
*blk = newblk;
return newblk->addr;
}
/*
* Add this block to the chain.
*/
newblk->next = *blk;
*blk = newblk;
return newblk->addr;
}
void
oss_memblk_free(oss_memblk_t **blk, void *addr)
{
oss_memblk_t *this_one = *blk, *prev = NULL;
while (this_one != NULL)
{
if (this_one->addr == addr)
{
if (prev == NULL) /* First one in the chain */
{
*blk = this_one->next;
KERNEL_FREE (this_one);
}
else
{
prev->next = this_one->next;
KERNEL_FREE (this_one);
}
return;
}
this_one = this_one->next;
}
}
void
oss_memblk_unalloc(oss_memblk_t **blk)
{
/*
* Free all memory allocations on the chain.
*/
oss_memblk_t *this_one = *blk;
while (this_one != NULL)
{
oss_memblk_t *next_one;
next_one = this_one->next;
KERNEL_FREE(this_one);
this_one = next_one;
}
*blk = NULL;
}
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