homework-jianmu/src/inc/twal.h

61 lines
1.7 KiB
C

/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _TD_WAL_H_
#define _TD_WAL_H_
#ifdef __cplusplus
extern "C" {
#endif
#define TAOS_WAL_NOLOG 0
#define TAOS_WAL_WRITE 1
#define TAOS_WAL_FSYNC 2
typedef struct {
int8_t msgType;
int8_t reserved[3];
int32_t len;
uint64_t version;
uint32_t signature;
uint32_t cksum;
char cont[];
} SWalHead;
typedef struct {
int8_t walLevel; // wal level
int32_t fsyncPeriod; // millisecond
int8_t wals; // number of WAL files;
int8_t keep; // keep the wal file when closed
} SWalCfg;
typedef void* twalh; // WAL HANDLE
typedef int (*FWalWrite)(void *ahandle, void *pHead, int type);
twalh walOpen(const char *path, const SWalCfg *pCfg);
int walAlter(twalh pWal, const SWalCfg *pCfg);
void walClose(twalh);
int walRenew(twalh);
int walWrite(twalh, SWalHead *);
void walFsync(twalh);
int walRestore(twalh, void *pVnode, FWalWrite writeFp);
int walGetWalFile(twalh, char *name, uint32_t *index);
int64_t walGetVersion(twalh);
#ifdef __cplusplus
}
#endif
#endif // _TD_WAL_H_