source: svn/trunk/newcon3bcm2_21bu/nexus/base/include/b_objdb.h @ 37

/***************************************************************************
 *     (c)2004-2011 Broadcom Corporation
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 * $brcm_Workfile: b_objdb.h $
 * $brcm_Revision: 5 $
 * $brcm_Date: 9/16/11 3:40p $
 *
 * Module Description:
 *
 * Revision History:
 *
 * $brcm_Log: /nexus/base/include/b_objdb.h $
 * 
 * 5   9/16/11 3:40p erickson
 * SW7420-2064: clean up unprotected callbacks when client exits, allow
 *  re-registration when client connects
 * 
 * 4   9/13/11 1:24p erickson
 * SW7420-1148: change client modes to unprotected/protected/untrusted
 * 
 * 3   9/2/11 10:01a erickson
 * SW7420-1148: allow implicit insert on acquire. allows non-thunked
 *  server to work with thunked client.
 * 
 * 2   7/26/11 12:07p erickson
 * SW7420-1992: callback database must take client id so that callbacks
 *  can be disconnected when a client releases
 * 
 * 1   4/1/11 9:59a erickson
 * SW7420-1671: refactor object database for multiprocess stress
 *
 ************************************************************/
#ifndef B_OBJDB_H__
#define B_OBJDB_H__

#include "bdbg.h"
#include "nexus_types.h"

/**
object database

this api is internal to nexus.
used by nexus kernel-mode proxy and user-mode multiprocess thunks.
it uses static allocation and transparent structs, not dynamic allocation and opaque handles.
**/

typedef enum b_objdb_verify
{
    b_objdb_verify_full,    /* verify handle, type and client */   
    b_objdb_verify_partial, /* verify handle and type, not client */
    b_objdb_verify_none,    /* do not verify the handle */
    b_objdb_verify_max
} b_objdb_verify;

/* the address of the b_objdb_client instance is the id for the client */
struct b_objdb_client
{
    b_objdb_verify verify;
    bool limited_api;
};

/* entries in heap b_objdb_heap. one per handle instance. */
struct b_objdb_entry {
    void *handle;
    const struct b_objdb_client *client; /* each object is owned by one client. destroy must match. verify must match client or acquired_client. */
    const struct b_objdb_client *acquired_client; /* each object can be acquired by one client. release must match. verify must match client or acquired_client. */
    unsigned order; /* persistent order, used to destroy objects in exact opposite of create */
};

/* dynamically allocated array of entries. one per handle type. */
struct b_objdb_heap {
    unsigned count; /* number of entries in the heap */
    struct b_objdb_entry data[1]; /* variable size trailer */
};

BDBG_OBJECT_ID_DECLARE(b_objdb);
struct b_objdb_class;

/*
b_objdb is the object database. There is one instance of b_objdb per module.
There is one mutex (nexus module handle) per objdb.
*/
struct b_objdb {
    BDBG_OBJECT(b_objdb)
    const char *name; /* debug */
    NEXUS_ModuleHandle module; /* provides synchronization for this DB. _locked functions already have this acquired. */
    unsigned object_count;
    struct b_objdb_class *class_table;

    /* callback to cancel callbacks for a handle */
    void (*cancel_callbacks_locked)(void *context, void *handle, void *client_id); /* called with module lock already acquired */
    void *cancel_callbacks_context;
};

typedef void (*b_objdb_callback)(void *handle);

/*
There is one b_objdb_class per class, or interface type.
A set of b_objdb_classes is assocatied with a single b_objdb.
It is statically populated using macros in the thunk.
*/
struct b_objdb_class {
    struct b_objdb *db;
    const char *type_name; /* handle type name, for debug */
    b_objdb_callback release; /* func to call for auto-release. this is called locked. */
    b_objdb_callback destructor; /* func to call for auto-close. this is called locked. */
    struct b_objdb_heap *objects; /* list of all instances for this object type */
};

#define B_OBJDB_TABLE_BEGIN(NAME) static struct b_objdb_class NAME[] = {
#define B_OBJDB_TABLE_END {NULL,NULL,NULL,NULL,NULL}};
#define B_OBJDB_TABLE_ENTRY(handletype,releasefunc,destructorfunc) {NULL, #handletype, (b_objdb_callback)releasefunc, (b_objdb_callback)destructorfunc, NULL},

/* b_objdb_init will hook up the statically-declared class_table. the caller must still manually
set db->module, name, cancel_callbacks and cancel_callbacks_context */
int  b_objdb_init(struct b_objdb *db, struct b_objdb_class *class_table);
void b_objdb_uninit(struct b_objdb *db);

/* functions called from thunk. module lock is already acquired. */
int b_objdb_insert_locked(struct b_objdb_class *p_class, void *handle, const struct b_objdb_client *client,
    bool acquiring /* if false, this is an insert. if true, this is an acquire. */
    );
int b_objdb_remove_locked(struct b_objdb_class *p_class, void *handle, const struct b_objdb_client *client,
    bool releasing /* if false, this pairs with an insert. if true, this pairs with an acquire. */
    );
int  b_objdb_verify_locked(struct b_objdb_class *p_class, void *handle, const struct b_objdb_client *client);

/* clear out all entries, but do not uninit */
void b_objdb_clear(struct b_objdb *db);

/* find newest entry for this client in this db.
returns 0 if an entry was found. */
int  b_objdb_get_newest_entry(struct b_objdb *db, const struct b_objdb_client *client, struct b_objdb_class **p_class, struct b_objdb_entry **p_entry);

/* uninit is called on auto-close. it will test if the client owns or has acquiring the handle. will perform one or two removes as needed. */
void b_objdb_uninit_entry(struct b_objdb_class *p_class, struct b_objdb_entry *entry, const struct b_objdb_client *client);

/* uninit all callbacks for this client */
void b_objdb_uninit_client(struct b_objdb *db, const struct b_objdb_client *client);

#endif