mirror of
git://source.winehq.org/git/wine.git
synced 2024-11-05 18:01:34 +00:00
142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/***************************************************************************
|
|
* Copyright 1995 Michael Veksler. mveksler@vnet.ibm.com
|
|
***************************************************************************
|
|
* File: generic_hash.h
|
|
* Purpose : dynamically growing hash, may use shared or local memory.
|
|
***************************************************************************
|
|
*/
|
|
#ifndef _GENERIC_HASH_H_
|
|
#define _GENERIC_HASH_H_
|
|
|
|
#include "windef.h"
|
|
#include "shm_block.h"
|
|
#include "win.h"
|
|
/* default hash values */
|
|
#define HASH_LOAD 70
|
|
#define HASH_MEM_ALLOC (HASH_PTR (*)(int size)) malloc
|
|
#define HASH_MEM_FREE (void (*)(HASH_PTR)) free
|
|
#define HASH_MEM_ACCESS access_local_hash
|
|
#define HASH_REALLOC_JUMPS 1.5 /* Relative size of the new memory */
|
|
#define MIN_HASH 13
|
|
|
|
typedef union {
|
|
char string[1];
|
|
WORD words[1];
|
|
DWORD dwords[1];
|
|
char *ptr;
|
|
SEGPTR segptr;
|
|
} HASH_VAL;
|
|
|
|
typedef struct hash_item_struct {
|
|
DWORD key;
|
|
HASH_VAL data;
|
|
} HASH_ITEM;
|
|
|
|
/* point to the hash structure */
|
|
typedef union {
|
|
HASH_ITEM* ptr; /* Local pointer */
|
|
REL_PTR rel; /* IPC relative address */
|
|
SEGPTR segptr; /* Universal (can be IPC or local) */
|
|
} HASH_PTR;
|
|
|
|
typedef struct hash_share_struct {
|
|
int total_items; /* total number of items (array size) */
|
|
int free_items; /* number of free items (excluding deleted) */
|
|
int deleted_items; /* number of deleted items */
|
|
int ptr_updates; /* Number of updates to `items' pointer */
|
|
/* (of items) - used for intecepting */
|
|
/* changes to the pointer. */
|
|
HASH_PTR items; /* pointer to the items */
|
|
} HASH_SHARED;
|
|
typedef BOOL HASH_ITEM_TEST(HASH_VAL *value, HASH_VAL *seeked_data);
|
|
|
|
/* NOTE:
|
|
* 1. Keys 0 and -1 are reserved.
|
|
* 2. none of these items should be accessed directly, use existing
|
|
* functions. If they are not enough, add a new function.
|
|
*/
|
|
typedef struct hash_container_struct {
|
|
int bytes_per_item;
|
|
int maximum_load; /* in percents (0..100) default is 70 */
|
|
int min_free_items; /* minimum free items before reallocating
|
|
(Function of maximum_load) */
|
|
|
|
int last_ptr_update; /* to be compared with shared.ptr_updates */
|
|
BOOL shared_was_malloced; /* Need that to know how to destroy hash */
|
|
|
|
/* This is an optional handler.
|
|
* If not NULL, this function is used for distinguishing between
|
|
* different data with the same key (key field holds integer and
|
|
* is too short for long keys like strings).
|
|
*/
|
|
HASH_ITEM_TEST *is_correct_item;
|
|
|
|
/* Handlers used for reallocating memory
|
|
* [by allocating new data and then freeing old data]
|
|
*/
|
|
HASH_PTR (*allocate_mem)(int size);
|
|
void (*free_mem)(HASH_PTR);
|
|
|
|
/* Translator from HASH_PTR construct to a regular pointer.
|
|
use HASH_MEM_ACCESS, if no translation is needed */
|
|
HASH_ITEM *(*access_mem)(HASH_PTR);
|
|
|
|
HASH_ITEM *items;
|
|
HASH_SHARED *shared; /* Things to be on shared memory. */
|
|
} HASH_CONTAINER;
|
|
|
|
|
|
/********** Hash maintenance functions ***********/
|
|
|
|
|
|
|
|
/* Attach existing & running remote (i.e. shared) hash.
|
|
* Attach the items using the data stored in "shared"
|
|
*/
|
|
HASH_CONTAINER *attach_remote_hash(HASH_SHARED *shared, int bytes_per_datum,
|
|
HASH_ITEM *(*access_mem)(HASH_PTR));
|
|
|
|
|
|
HASH_CONTAINER *create_remote_hash(HASH_SHARED *shared,
|
|
int bytes_per_datum,
|
|
int total_items,
|
|
HASH_PTR (*allocate_mem)(int size),
|
|
HASH_ITEM *(*access_mem)(HASH_PTR));
|
|
/* hash constructor: create brand new hash (not on shared memory) */
|
|
HASH_CONTAINER *create_hash(int bytes_per_datum, int total_items);
|
|
|
|
/* set the extra handlers to non default values */
|
|
void set_hash_handlers(HASH_CONTAINER *hash,
|
|
HASH_ITEM_TEST *is_correct_item,
|
|
HASH_PTR (*allocate_mem)(int size),
|
|
void (*free_mem)(HASH_PTR),
|
|
HASH_ITEM *(*access_mem)(HASH_PTR));
|
|
|
|
/* set extra parameters */
|
|
void set_hash_parameters(HASH_CONTAINER *hash, int load);
|
|
|
|
/* hash destructors */
|
|
void destroy_hash(HASH_CONTAINER *hash);
|
|
void detach_hash(HASH_CONTAINER *hash);
|
|
|
|
|
|
/********** Hash usage *************/
|
|
|
|
/* All following functions have the same format:
|
|
* hash- the hash structure to use
|
|
* key- used as primary means to get to the entry.
|
|
* data- 1. a secondary key (used only if `is_correct_item' is set).
|
|
* 2. data to store. (for hash_add_item).
|
|
*/
|
|
HASH_VAL *hash_locate_item(HASH_CONTAINER* hash,int key, HASH_VAL* seeked_data);
|
|
BOOL hash_add_item(HASH_CONTAINER* hash, int key, HASH_VAL* data);
|
|
BOOL hash_delete_item(HASH_CONTAINER* hash, int key, HASH_VAL* seeked_data);
|
|
|
|
|
|
void *ret_null(); /* function returning null (used for */
|
|
/* disabling memory reallocation) */
|
|
|
|
/* access function used by local (non IPC) memory */
|
|
HASH_ITEM *access_local_hash(HASH_PTR ptr);
|
|
|
|
#endif /* _GENERIC_HASH_H_ */
|