txn.h
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上传日期:2007-04-14
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文件大小:5k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- *
- * $Id: txn.h,v 11.12 2001/01/02 17:23:39 margo Exp $
- */
- #ifndef _TXN_H_
- #define _TXN_H_
- #include "xa.h"
- struct __db_txnmgr; typedef struct __db_txnmgr DB_TXNMGR;
- struct __db_txnregion; typedef struct __db_txnregion DB_TXNREGION;
- /*
- * !!!
- * TXN_MINIMUM = (DB_LOCK_MAXID + 1) but this makes compilers complain.
- */
- #define TXN_MINIMUM 0x80000000
- #define TXN_INVALID 0xffffffff /* Maximum number of txn ids. */
- #define TXN_INVALID_ID 0 /* Invalid transaction ID. */
- #define DEF_MAX_TXNS 20 /* Default max transactions. */
- /* The structure allocated for every transaction. */
- struct __db_txn {
- DB_TXNMGR *mgrp; /* Pointer to transaction manager. */
- DB_TXN *parent; /* Pointer to transaction's parent. */
- DB_LSN last_lsn; /* Lsn of last log write. */
- u_int32_t txnid; /* Unique transaction id. */
- roff_t off; /* Detail structure within region. */
- TAILQ_ENTRY(__db_txn) links; /* Links transactions off manager. */
- TAILQ_HEAD(__kids, __db_txn) kids; /* Child transactions. */
- TAILQ_ENTRY(__db_txn) klinks; /* Links child transactions. */
- u_int32_t cursors; /* Number of cursors open for txn */
- #define TXN_CHILDCOMMIT 0x01 /* Transaction that has committed. */
- #define TXN_MALLOC 0x02 /* Structure allocated by TXN system. */
- #define TXN_NOSYNC 0x04 /* Do not sync on prepare and commit. */
- #define TXN_NOWAIT 0x08 /* Do not wait on locks. */
- #define TXN_SYNC 0x10 /* Sync on prepare and commit. */
- u_int32_t flags;
- };
- /*
- * Internal data maintained in shared memory for each transaction.
- */
- typedef char DB_XID[XIDDATASIZE];
- typedef struct __txn_detail {
- u_int32_t txnid; /* current transaction id
- used to link free list also */
- DB_LSN last_lsn; /* last lsn written for this txn */
- DB_LSN begin_lsn; /* lsn of begin record */
- roff_t parent; /* Offset of transaction's parent. */
- #define TXN_RUNNING 1
- #define TXN_ABORTED 2
- #define TXN_PREPARED 3
- #define TXN_COMMITTED 4
- u_int32_t status; /* status of the transaction */
- SH_TAILQ_ENTRY links; /* free/active list */
- #define TXN_XA_ABORTED 1
- #define TXN_XA_DEADLOCKED 2
- #define TXN_XA_ENDED 3
- #define TXN_XA_PREPARED 4
- #define TXN_XA_STARTED 5
- #define TXN_XA_SUSPENDED 6
- u_int32_t xa_status; /* XA status */
- /*
- * XID (xid_t) structure: because these fields are logged, the
- * sizes have to be explicit.
- */
- DB_XID xid; /* XA global transaction id */
- u_int32_t bqual; /* bqual_length from XID */
- u_int32_t gtrid; /* gtrid_length from XID */
- int32_t format; /* XA format */
- } TXN_DETAIL;
- /*
- * DB_TXNMGR --
- * The transaction manager encapsulates the transaction system.
- */
- struct __db_txnmgr {
- /*
- * These fields need to be protected for multi-threaded support.
- *
- * !!!
- * As this structure is allocated in per-process memory, the mutex may need
- * to be stored elsewhere on architectures unable to support mutexes in heap
- * memory, e.g., HP/UX 9.
- */
- MUTEX *mutexp; /* Lock list of active transactions
- * (including the content of each
- * TXN_DETAIL structure on the list).
- */
- /* List of active transactions. */
- TAILQ_HEAD(_chain, __db_txn) txn_chain;
- /* These fields are never updated after creation, and so not protected. */
- DB_ENV *dbenv; /* Environment. */
- REGINFO reginfo; /* Region information. */
- };
- /*
- * DB_TXNREGION --
- * The primary transaction data structure in the shared memory region.
- */
- struct __db_txnregion {
- u_int32_t maxtxns; /* maximum number of active TXNs */
- u_int32_t last_txnid; /* last transaction id given out */
- DB_LSN pending_ckp; /* last checkpoint did not finish */
- DB_LSN last_ckp; /* lsn of the last checkpoint */
- time_t time_ckp; /* time of last checkpoint */
- u_int32_t logtype; /* type of logging */
- u_int32_t locktype; /* lock type */
- u_int32_t naborts; /* number of aborted TXNs */
- u_int32_t ncommits; /* number of committed TXNs */
- u_int32_t nbegins; /* number of begun TXNs */
- u_int32_t nactive; /* number of active TXNs */
- u_int32_t maxnactive; /* maximum number of active TXNs */
- /* active TXN list */
- SH_TAILQ_HEAD(__active) active_txn;
- };
- /*
- * Make the region large enough to hold N transaction detail structures
- * plus some space to hold thread handles and the beginning of the shalloc
- * region.
- */
- #define TXN_REGION_SIZE(N)
- (sizeof(DB_TXNREGION) + N * sizeof(TXN_DETAIL) + 1000)
- /*
- * Log record types.
- */
- #define TXN_COMMIT 1
- #define TXN_PREPARE 2
- #include "txn_auto.h"
- #include "txn_ext.h"
- #include "xa_ext.h"
- #endif /* !_TXN_H_ */