txn_stat.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: txn_stat.c,v 11.15 2002/04/26 23:00:36 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "dbinc/txn.h"
- /*
- * __txn_stat --
- *
- * PUBLIC: int __txn_stat __P((DB_ENV *, DB_TXN_STAT **, u_int32_t));
- */
- int
- __txn_stat(dbenv, statp, flags)
- DB_ENV *dbenv;
- DB_TXN_STAT **statp;
- u_int32_t flags;
- {
- DB_TXNMGR *mgr;
- DB_TXNREGION *region;
- DB_TXN_STAT *stats;
- TXN_DETAIL *txnp;
- size_t nbytes;
- u_int32_t ndx;
- int ret;
- PANIC_CHECK(dbenv);
- ENV_REQUIRES_CONFIG(dbenv, dbenv->tx_handle, "txn_stat", DB_INIT_TXN);
- *statp = NULL;
- if ((ret = __db_fchk(dbenv,
- "DB_ENV->txn_stat", flags, DB_STAT_CLEAR)) != 0)
- return (ret);
- mgr = dbenv->tx_handle;
- region = mgr->reginfo.primary;
- /*
- * Allocate for the maximum active transactions -- the DB_TXN_ACTIVE
- * struct is small and the maximum number of active transactions is
- * not going to be that large. Don't have to lock anything to look
- * at the region's maximum active transactions value, it's read-only
- * and never changes after the region is created.
- */
- nbytes = sizeof(DB_TXN_STAT) + sizeof(DB_TXN_ACTIVE) * region->maxtxns;
- if ((ret = __os_umalloc(dbenv, nbytes, &stats)) != 0)
- return (ret);
- R_LOCK(dbenv, &mgr->reginfo);
- memcpy(stats, ®ion->stat, sizeof(*stats));
- stats->st_last_txnid = region->last_txnid;
- stats->st_last_ckp = region->last_ckp;
- stats->st_time_ckp = region->time_ckp;
- stats->st_txnarray = (DB_TXN_ACTIVE *)&stats[1];
- ndx = 0;
- for (txnp = SH_TAILQ_FIRST(®ion->active_txn, __txn_detail);
- txnp != NULL;
- txnp = SH_TAILQ_NEXT(txnp, links, __txn_detail)) {
- stats->st_txnarray[ndx].txnid = txnp->txnid;
- if (txnp->parent == INVALID_ROFF)
- stats->st_txnarray[ndx].parentid = TXN_INVALID;
- else
- stats->st_txnarray[ndx].parentid =
- ((TXN_DETAIL *)R_ADDR(&mgr->reginfo,
- txnp->parent))->txnid;
- stats->st_txnarray[ndx].lsn = txnp->begin_lsn;
- ndx++;
- }
- stats->st_region_wait = mgr->reginfo.rp->mutex.mutex_set_wait;
- stats->st_region_nowait = mgr->reginfo.rp->mutex.mutex_set_nowait;
- stats->st_regsize = mgr->reginfo.rp->size;
- if (LF_ISSET(DB_STAT_CLEAR)) {
- mgr->reginfo.rp->mutex.mutex_set_wait = 0;
- mgr->reginfo.rp->mutex.mutex_set_nowait = 0;
- memset(®ion->stat, 0, sizeof(region->stat));
- region->stat.st_maxtxns = region->maxtxns;
- region->stat.st_maxnactive =
- region->stat.st_nactive = stats->st_nactive;
- }
- R_UNLOCK(dbenv, &mgr->reginfo);
- *statp = stats;
- return (0);
- }