153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/* -------------------------------------------------------------------
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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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#include "bdberl_tpool.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 void bdberl_drv_finish();
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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_input(ErlDrvData handle, ErlDrvEvent ev);
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/**
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* Command codes
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*/
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#define CMD_NONE 0
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#define CMD_OPEN_DB 1
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#define CMD_CLOSE_DB 2
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#define CMD_TXN_BEGIN 3
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#define CMD_TXN_COMMIT 4
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#define CMD_TXN_ABORT 5
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#define CMD_GET 6
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#define CMD_PUT 7
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#define CMD_PUT_ATOMIC 8
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/**
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* Command status values
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*/
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#define STATUS_OK 0
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#define STATUS_ERROR 1
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/**
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* Database Types (see db.h)
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*/
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#define DB_TYPE_BTREE DB_BTREE /* 1 */
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#define DB_TYPE_HASH DB_HASH /* 2 */
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/**
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* Error codes -- chosen so that we do not conflict with other packages, particularly
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* db.h. We use error namespace from -29000 to -29500.
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*/
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#define ERROR_MAX_DBS (-29000) /* System can not open any further databases */
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#define ERROR_ASYNC_PENDING (-29001) /* Async operation already pending on this port */
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#define ERROR_INVALID_DBREF (-29002) /* DbRef not currently opened by this port */
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#define ERROR_TXN_OPEN (-29003) /* Transaction already active on this port */
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#define ERROR_NO_TXN (-29004) /* No transaction open on this port */
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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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bdberl_drv_ready_input, /* 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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bdberl_drv_finish, /* 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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NULL, /* 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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NULL /* F_PTR process_exit */
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};
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typedef struct _DbRefList
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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 _PortList
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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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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
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* active */
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int pipe_fds[2]; /* Array of pipe fds for signaling purposes */
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int async_op; /* Value indicating what async op is pending */
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void* async_data; /* Opaque point to data used during async op */
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TPoolJob* async_job; /* Active job on the thread pool */
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TPool* async_pool; /* Pool the async job is running on */
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} PortData;
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typedef struct
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{
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PortData* port; /* Port that originated this request -- READ ONLY! */
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int rc; /* Return code from operation */
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DB* db; /* Database to use for data storage/retrieval */
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void* payload; /* Packed key/value data */
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int payload_sz; /* Size of payload */
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} AsyncData;
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#endif
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