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#ifndef INCLUDED_RTL_ALLOC_ARENA_HXX
#define INCLUDED_RTL_ALLOC_ARENA_HXX

#include "sal/types.h"
#include "rtl/alloc.h"
#include "alloc_impl.hxx"

/** rtl_arena_stat_type
 *  @internal
 */
struct rtl_arena_stat_type
{
    sal_uInt64 m_alloc;
    sal_uInt64 m_free;

    sal_Size   m_mem_total;
    sal_Size   m_mem_alloc;
};


/** rtl_arena_segment_type
 *  @internal
 */
#define RTL_ARENA_SEGMENT_TYPE_HEAD ((sal_Size)(0x01))
#define RTL_ARENA_SEGMENT_TYPE_SPAN ((sal_Size)(0x02))
#define RTL_ARENA_SEGMENT_TYPE_FREE ((sal_Size)(0x04))
#define RTL_ARENA_SEGMENT_TYPE_USED ((sal_Size)(0x08))

struct rtl_arena_segment_type
{
    /* segment list linkage */
    rtl_arena_segment_type * m_snext;
    rtl_arena_segment_type * m_sprev;

    /* free/used list linkage */
    rtl_arena_segment_type * m_fnext;
    rtl_arena_segment_type * m_fprev;

    /* segment description */
    sal_uIntPtr         m_addr;
    sal_Size            m_size;
    sal_Size            m_type;
};


/** rtl_arena_type
 *  @internal
 */
#define RTL_ARENA_FREELIST_SIZE (sizeof(void*) * 8)
#define RTL_ARENA_HASH_SIZE     64

#define RTL_ARENA_FLAG_RESCALE  1 /* within hash rescale operation */

struct rtl_arena_st
{
    /* linkage */
    rtl_arena_type *          m_arena_next;
    rtl_arena_type *          m_arena_prev;

    /* properties */
    char                      m_name[RTL_ARENA_NAME_LENGTH + 1];
    long                      m_flags;

    rtl_memory_lock_type      m_lock;
    rtl_arena_stat_type       m_stats;

    rtl_arena_type *          m_source_arena;
    void * (SAL_CALL * m_source_alloc)(rtl_arena_type *, sal_Size *);
    void   (SAL_CALL * m_source_free) (rtl_arena_type *, void *, sal_Size);

    sal_Size                  m_quantum;
    sal_Size                  m_quantum_shift; /* log2(m_quantum) */

    rtl_arena_segment_type    m_segment_reserve_span_head;
    rtl_arena_segment_type    m_segment_reserve_head;

    rtl_arena_segment_type    m_segment_head;

    rtl_arena_segment_type    m_freelist_head[RTL_ARENA_FREELIST_SIZE];
    sal_Size                  m_freelist_bitmap;

    rtl_arena_segment_type ** m_hash_table;
    rtl_arena_segment_type *  m_hash_table_0[RTL_ARENA_HASH_SIZE];
    sal_Size                  m_hash_size;  /* m_hash_mask + 1   */
    sal_Size                  m_hash_shift; /* log2(m_hash_size) */

    sal_Size                  m_qcache_max;
    rtl_cache_type **         m_qcache_ptr;
};


/** gp_default_arena
 *  default arena with pagesize quantum
 *
 *  @internal
 */
extern rtl_arena_type * gp_default_arena;

#endif /* INCLUDED_RTL_ALLOC_ARENA_HXX */

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