#ifndef __ALLOCWITHIN_INT_H__
#define __ALLOCWITHIN_INT_H__

/**
 *  $Id$
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_LIBPTHREAD
#include <pthread.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef STDC_HEADERS
#include <stdio.h>
#include <errno.h>
#endif

#include "allocwithin.h"

#ifdef HAVE___ATTRIBUTE__
#define UNUSED __attribute__((__unused__))
#endif

struct allocw_block_
{
    size_t size;       /* total bytes of this block, including this header struct */
    allocw_id_t next_off;   /* byte-offset of next block, from start-of-region */
    allocw_id_t prev_off;   /* byte-offset of prev block, from start-of-region */
    char data_[];               /* user data follows this header struct */
};

struct allocw_region_
{
    size_t size;           /* total bytes of this region, including this header struct */
    allocw_id_t free_start;     /* first free block */
    allocw_id_t free_end;       /* last free block */
    pthread_mutex_t freelist_mutex; /* mutex for accessing freelist */
    unsigned int num_alloced;   /* number of outstanding allocations */
    char data_[];                   /* blocks follow this header struct */
};

/* convert an id into a region to a pointer */
#define BLOCK_PTR(__region, __id) ( (struct allocw_block_ *)((char *)(__region) + (__id)) )

/* convert a pointer to a block in a region to an id */
#define BLOCK_OFF(__region, __block) ( (void *)(__block) - (void *)(__region) )

#endif /* __ALLOCWITHIN_INT_H__ */