112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
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/* -------------------------------------------------------------------
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*
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* bdberl: Berkeley DB Driver for Erlang
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* Copyright (c) 2008 The Hive. All rights reserved.
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*
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* ------------------------------------------------------------------- */
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#ifndef _BDBERL_DRV
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#define _BDBERL_DRV
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#include "erl_driver.h"
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#include "db.h"
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/**
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* Driver functions
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*/
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static ErlDrvData bdberl_drv_start(ErlDrvPort port, char* buffer);
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static void bdberl_drv_stop(ErlDrvData handle);
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static int bdberl_drv_control(ErlDrvData handle, unsigned int cmd,
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char* inbuf, int inbuf_sz,
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char** outbuf, int outbuf_sz);
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static void bdberl_drv_ready_async(ErlDrvData handle, ErlDrvThreadData thread_data);
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static void bdberl_drv_process_exit(ErlDrvData handle, ErlDrvMonitor *monitor);
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/**
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* Command codes
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*/
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#define CMD_OPEN_DB 0
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#define CMD_CLOSE_DB 1
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#define CMD_TXN_BEGIN 2
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#define CMD_TXN_COMMIT 3
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#define CMD_TXN_ABORT 4
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#define CMD_GET 5
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#define CMD_PUT 6
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#define CMD_PUT_ATOMIC 7
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/**
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* Driver Entry
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*/
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ErlDrvEntry bdberl_drv_entry =
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{
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NULL, /* F_PTR init, N/A */
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bdberl_drv_start, /* L_PTR start, called when port is opened */
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bdberl_drv_stop, /* F_PTR stop, called when port is closed */
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NULL, /* F_PTR output, called when erlang has sent */
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NULL, /* F_PTR ready_input, called when input descriptor ready */
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NULL, /* F_PTR ready_output, called when output descriptor ready */
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"bdberl_drv", /* driver_name */
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NULL, /* F_PTR finish, called when unloaded */
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NULL, /* handle */
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bdberl_drv_control, /* F_PTR control, port_command callback */
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NULL, /* F_PTR timeout, reserved */
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NULL, /* F_PTR outputv, reserved */
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bdberl_drv_ready_async, /* F_PTR ready_async */
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NULL, /* F_PTR flush */
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NULL, /* F_PTR call */
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NULL, /* F_PTR event */
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ERL_DRV_EXTENDED_MARKER,
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ERL_DRV_EXTENDED_MAJOR_VERSION,
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ERL_DRV_EXTENDED_MINOR_VERSION,
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ERL_DRV_FLAG_USE_PORT_LOCKING,
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NULL, /* Reserved */
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bdberl_drv_process_exit /* F_PTR process_exit */
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};
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typedef struct
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{
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unsigned int dbref;
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struct DbRefList* next;
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} DbRefList;
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typedef struct
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{
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ErlDrvPort port;
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struct PortList* next;
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} PortList;
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typedef struct
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{
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DB* db;
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const char* name;
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PortList* ports;
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} Database;
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/**
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* Structure for holding port instance data
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*/
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typedef struct
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{
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ErlDrvPort port;
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DB_TXN* txn; /* Transaction handle for this port; each port may only have 1 txn
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* active */
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int in_flight; /* Flag indicating if this port has an operation pending on the async
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* pool. */
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DbRefList* dbrefs; /* List of databases that this port has opened */
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} PortData;
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#endif
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