126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)db_thread.c 8.11 (Sleepycat) 8/18/97";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#endif
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#include "db_int.h"
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#include "db_page.h"
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#include "shqueue.h"
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#include "db_am.h"
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static int __db_getlockid __P((DB *, DB *));
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/*
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* __db_gethandle --
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* Called by db access method routines when the DB_THREAD flag is set.
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* This routine returns a handle, either an existing handle from the
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* chain of handles, or creating one if necessary.
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*
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* PUBLIC: int __db_gethandle __P((DB *, int (*)(DB *, DB *), DB **));
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*/
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int
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__db_gethandle(dbp, am_func, dbpp)
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DB *dbp, **dbpp;
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int (*am_func) __P((DB *, DB *));
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{
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DB *ret_dbp;
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int ret, t_ret;
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if ((ret = __db_mutex_lock((db_mutex_t *)dbp->mutex, -1,
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dbp->dbenv == NULL ? NULL : dbp->dbenv->db_yield)) != 0)
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return (ret);
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if ((ret_dbp = LIST_FIRST(&dbp->handleq)) != NULL)
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/* Simply take one off the list. */
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LIST_REMOVE(ret_dbp, links);
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else {
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/* Allocate a new handle. */
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if ((ret_dbp = (DB *)malloc(sizeof(*dbp))) == NULL) {
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ret = ENOMEM;
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goto err;
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}
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memcpy(ret_dbp, dbp, sizeof(*dbp));
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ret_dbp->internal = NULL;
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TAILQ_INIT(&ret_dbp->curs_queue);
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/* Set the locker, the lock structure and the lock DBT. */
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if ((ret = __db_getlockid(dbp, ret_dbp)) != 0)
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goto err;
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/* Finally, call the access method specific dup function. */
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if ((ret = am_func(dbp, ret_dbp)) != 0)
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goto err;
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}
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*dbpp = ret_dbp;
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if (0) {
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err: if (ret_dbp != NULL)
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FREE(ret_dbp, sizeof(*ret_dbp));
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}
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if ((t_ret =
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__db_mutex_unlock((db_mutex_t *)dbp->mutex, -1)) != 0 && ret == 0)
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ret = t_ret;
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return (ret);
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}
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/*
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* __db_puthandle --
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* Return a DB handle to the pool for later use.
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*
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* PUBLIC: int __db_puthandle __P((DB *));
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*/
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int
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__db_puthandle(dbp)
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DB *dbp;
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{
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DB *master;
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int ret;
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master = dbp->master;
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if ((ret = __db_mutex_lock((db_mutex_t *)master->mutex, -1,
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dbp->dbenv == NULL ? NULL : dbp->dbenv->db_yield)) != 0)
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return (ret);
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LIST_INSERT_HEAD(&master->handleq, dbp, links);
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return (__db_mutex_unlock((db_mutex_t *)master->mutex, -1));
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}
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/*
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* __db_getlockid --
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* Create a new locker ID and copy the file lock information from
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* the old DB into the new one.
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*/
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static int
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__db_getlockid(dbp, new_dbp)
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DB *dbp, *new_dbp;
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{
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int ret;
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if (F_ISSET(dbp, DB_AM_LOCKING)) {
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if ((ret = lock_id(dbp->dbenv->lk_info, &new_dbp->locker)) != 0)
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return (ret);
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memcpy(new_dbp->lock.fileid, dbp->lock.fileid, DB_FILE_ID_LEN);
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new_dbp->lock_dbt.size = sizeof(new_dbp->lock);
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new_dbp->lock_dbt.data = &new_dbp->lock;
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}
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return (0);
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}
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