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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/* ABAPI Broker */
/* Pete Rowley */
#include "stdio.h"
#include "slap.h"
#include "prlock.h"
#include "prerror.h"
#include "prcvar.h"
#include "prio.h"
static Slapi_Mutex *buffer_lock = 0;
/* circular api buffer */
typedef struct _THEABAPI
{
char *guid;
void **api;
struct _THEABAPI *next;
struct _THEABAPI *prev;
} ABAPI;
typedef struct _API_FEATURES
{
int refcount;
slapi_apib_callback_on_zero callback_on_zero;
Slapi_Mutex *lock;
} APIB_FEATURES;
static ABAPI *head = NULL;
static ABAPI **ABAPIBroker_FindInterface(char *guid);
int slapi_apib_register(char *guid, void **api )
{
int ret = -1;
ABAPI *item;
if(buffer_lock == 0)
{
if(0 == (buffer_lock = slapi_new_mutex())) /* we never free this mutex */
/* badness */
return -1;
}
/* simple - we don't check for duplicates */
item = (ABAPI*)slapi_ch_malloc(sizeof(ABAPI));
if(item)
{
item->guid = guid;
item->api = api;
slapi_lock_mutex(buffer_lock);
if(head == NULL)
{
head = item;
head->next = head;
head->prev = head;
}
else
{
item->next = head;
item->prev = head->prev;
head->prev = item;
item->prev->next = item;
}
slapi_unlock_mutex(buffer_lock);
ret = 0;
}
return ret;
}
int slapi_apib_unregister(char *guid)
{
int ret = -1;
ABAPI **api;
if(buffer_lock == 0)
return ret;
if(buffer_lock == 0)
{
if(0 == (buffer_lock = slapi_new_mutex())) /* we never free this mutex */
/* badness */
return -1;
}
slapi_lock_mutex(buffer_lock);
if((api = ABAPIBroker_FindInterface(guid)) != NULL)
{
(*api)->prev->next = (*api)->next;
(*api)->next->prev = (*api)->prev;
if(*api == head)
{
head = (*api)->next;
}
if(*api == head) /* must be the last item, turn off the lights */
head = 0;
slapi_ch_free((void**)api);
*api = 0;
ret = 0;
}
slapi_unlock_mutex(buffer_lock);
return ret;
}
int slapi_apib_get_interface(char *guid, void ***api)
{
int ret = -1;
ABAPI **theapi;
if(buffer_lock == 0)
return ret;
if(buffer_lock == 0)
{
if(0 == (buffer_lock = slapi_new_mutex())) /* we never free this mutex */
/* badness */
return -1;
}
slapi_lock_mutex(buffer_lock);
if((theapi = ABAPIBroker_FindInterface(guid)) != NULL)
{
*api = (*theapi)->api;
if((*api)[0])
{
slapi_apib_addref(*api);
}
ret = 0;
}
slapi_unlock_mutex(buffer_lock);
return ret;
}
int slapi_apib_make_reference_counted(void **api, slapi_apib_callback_on_zero callback_on_zero)
{
int ret = -1;
if(api[0] == 0)
{
api[0] = slapi_ch_malloc(sizeof(APIB_FEATURES));
if(api[0])
{
((APIB_FEATURES*)(api[0]))->lock = slapi_new_mutex();
if(((APIB_FEATURES*)(api[0]))->lock)
{
((APIB_FEATURES*)(api[0]))->refcount = 0; /* the ref count */
((APIB_FEATURES*)(api[0]))->callback_on_zero = callback_on_zero;
ret = 0;
}
else
slapi_ch_free(&(api[0]));
}
}
return ret;
}
int slapi_apib_addref(void **api)
{
int ret;
slapi_lock_mutex(((APIB_FEATURES*)(api[0]))->lock);
ret = ++(((APIB_FEATURES*)(api[0]))->refcount);
slapi_unlock_mutex(((APIB_FEATURES*)(api[0]))->lock);
return ret;
}
int slapi_apib_release(void **api)
{
APIB_FEATURES *features;
int ret;
slapi_lock_mutex(((APIB_FEATURES*)(api[0]))->lock);
ret = --(((APIB_FEATURES*)(api[0]))->refcount);
if(((APIB_FEATURES*)(api[0]))->refcount == 0 && ((APIB_FEATURES*)(api[0]))->callback_on_zero)
{
/* save our stuff for when it gets zapped */
features = (APIB_FEATURES*)api[0];
if(0==((APIB_FEATURES*)(api[0]))->callback_on_zero(api)) /* this should deregister the interface */
{
slapi_unlock_mutex(features->lock);
slapi_destroy_mutex(features->lock);
slapi_ch_free((void **)&features);
}
else
slapi_unlock_mutex(features->lock);
}
else
slapi_unlock_mutex(((APIB_FEATURES*)(api[0]))->lock);
return ret;
}
static ABAPI **ABAPIBroker_FindInterface(char *guid)
{
static ABAPI *api = 0; /* simple gut feeling optimization for constant calls on same api */
ABAPI *start_api = api;
if(!api) {
start_api = api = head;
}
if(api)
{
do
{
if(0 == strcmp(guid, api->guid))
{
return &api;
}
api = api->next;
}
while(api != start_api);
}
return 0;
}
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