bdberl/c_src/bdberl_drv.h

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/* -------------------------------------------------------------------
*
* bdberl: Berkeley DB Driver for Erlang
* Copyright (c) 2008 The Hive. All rights reserved.
*
* ------------------------------------------------------------------- */
#ifndef _BDBERL_DRV
#define _BDBERL_DRV
#include "erl_driver.h"
#include "db.h"
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#include "bdberl_tpool.h"
/**
* Driver functions
*/
static ErlDrvData bdberl_drv_start(ErlDrvPort port, char* buffer);
static void bdberl_drv_stop(ErlDrvData handle);
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static void bdberl_drv_finish();
static int bdberl_drv_control(ErlDrvData handle, unsigned int cmd,
char* inbuf, int inbuf_sz,
char** outbuf, int outbuf_sz);
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static void bdberl_drv_ready_input(ErlDrvData handle, ErlDrvEvent ev);
/**
* Command codes
*/
#define CMD_NONE 0
#define CMD_OPEN_DB 1
#define CMD_CLOSE_DB 2
#define CMD_TXN_BEGIN 3
#define CMD_TXN_COMMIT 4
#define CMD_TXN_ABORT 5
#define CMD_GET 6
#define CMD_PUT 7
#define CMD_PUT_ATOMIC 8
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/**
* Command status values
*/
#define STATUS_OK 0
#define STATUS_ERROR 1
/**
* Database Types (see db.h)
*/
#define DB_TYPE_BTREE DB_BTREE /* 1 */
#define DB_TYPE_HASH DB_HASH /* 2 */
/**
* Error codes -- chosen so that we do not conflict with other packages, particularly
* db.h. We use error namespace from -29000 to -29500.
*/
#define ERROR_MAX_DBS (-29000) /* System can not open any further databases */
#define ERROR_ASYNC_PENDING (-29001) /* Async operation already pending on this port */
#define ERROR_INVALID_DBREF (-29002) /* DbRef not currently opened by this port */
#define ERROR_TXN_OPEN (-29003) /* Transaction already active on this port */
#define ERROR_NO_TXN (-29004) /* No transaction open on this port */
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/**
* Driver Entry
*/
ErlDrvEntry bdberl_drv_entry =
{
NULL, /* F_PTR init, N/A */
bdberl_drv_start, /* L_PTR start, called when port is opened */
bdberl_drv_stop, /* F_PTR stop, called when port is closed */
NULL, /* F_PTR output, called when erlang has sent */
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bdberl_drv_ready_input, /* F_PTR ready_input, called when input descriptor ready */
NULL, /* F_PTR ready_output, called when output descriptor ready */
"bdberl_drv", /* driver_name */
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bdberl_drv_finish, /* F_PTR finish, called when unloaded */
NULL, /* handle */
bdberl_drv_control, /* F_PTR control, port_command callback */
NULL, /* F_PTR timeout, reserved */
NULL, /* F_PTR outputv, reserved */
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NULL, /* F_PTR ready_async */
NULL, /* F_PTR flush */
NULL, /* F_PTR call */
NULL, /* F_PTR event */
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
ERL_DRV_FLAG_USE_PORT_LOCKING,
NULL, /* Reserved */
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NULL /* F_PTR process_exit */
};
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typedef struct _DbRefList
{
unsigned int dbref;
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struct _DbRefList* next;
} DbRefList;
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typedef struct _PortList
{
ErlDrvPort port;
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struct _PortList* next;
} PortList;
typedef struct
{
DB* db;
const char* name;
PortList* ports;
} Database;
/**
* Structure for holding port instance data
*/
typedef struct
{
ErlDrvPort port;
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DbRefList* dbrefs; /* List of databases that this port has opened */
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DB_TXN* txn; /* Transaction handle for this port; each port may only have 1 txn
* active */
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int pipe_fds[2]; /* Array of pipe fds for signaling purposes */
int async_op; /* Value indicating what async op is pending */
void* async_data; /* Opaque point to data used during async op */
TPoolJob* async_job; /* Active job on the thread pool */
TPool* async_pool; /* Pool the async job is running on */
} PortData;
typedef struct
{
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PortData* port; /* Port that originated this request -- READ ONLY! */
int rc; /* Return code from operation */
DB* db; /* Database to use for data storage/retrieval */
void* payload; /* Packed key/value data */
int payload_sz; /* Size of payload */
} AsyncData;
#endif