txn.h
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上传日期:2022-05-23
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- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- *
- * $Id: txn.h,v 11.43 2002/08/29 14:22:19 margo Exp $
- */
- #ifndef _TXN_H_
- #define _TXN_H_
- #include "dbinc/xa.h"
- /* Operation parameters to the delayed commit processing code. */
- typedef enum {
- TXN_REMOVE, /* Remove a file. */
- TXN_TRADE, /* Trade lockers. */
- TXN_TRADED /* Already traded; downgrade lock. */
- } TXN_EVENT_T;
- 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_MAXIMUM 0xffffffff /* Maximum number of txn ids. */
- #define TXN_INVALID 0 /* Invalid transaction ID. */
- #define DEF_MAX_TXNS 20 /* Default max transactions. */
- /*
- * Internal data maintained in shared memory for each transaction.
- */
- 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 */
- #define TXN_COLLECTED 0x1
- #define TXN_RESTORED 0x2
- u_int32_t flags; /* collected during txn_recover */
- 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.
- */
- u_int8_t xid[XIDDATASIZE]; /* 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.
- */
- DB_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;
- u_int32_t n_discards; /* Number of txns discarded. */
- /* 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 */
- u_int32_t cur_maxid; /* current max unused id. */
- 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 */
- DB_TXN_STAT stat; /* Statistics for txns. */
- #define TXN_IN_RECOVERY 0x01 /* environment is being recovered */
- u_int32_t flags;
- /* active TXN list */
- SH_TAILQ_HEAD(__active) active_txn;
- #ifdef HAVE_MUTEX_SYSTEM_RESOURCES
- #define TXN_MAINT_SIZE (sizeof(roff_t) * DB_MAX_HANDLES)
- roff_t maint_off; /* offset of region maintenance info */
- #endif
- };
- /*
- * Log record types. Note that these are *not* alphabetical. This is
- * intentional so that we don't change the meaning of values between
- * software upgrades. EXPECTED, UNEXPECTED, IGNORE, NOTFOUND and OK
- * are used in the
- * txnlist functions.
- */
- #define TXN_OK 0
- #define TXN_COMMIT 1
- #define TXN_PREPARE 2
- #define TXN_ABORT 3
- #define TXN_NOTFOUND 4
- #define TXN_IGNORE 5
- #define TXN_EXPECTED 6
- #define TXN_UNEXPECTED 7
- #include "dbinc_auto/txn_auto.h"
- #include "dbinc_auto/txn_ext.h"
- #include "dbinc_auto/xa_ext.h"
- #endif /* !_TXN_H_ */