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/*-
* Copyright (c) 2014-2015 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#define WT_WITH_DHANDLE(s, d, e) do { \
WT_DATA_HANDLE *__saved_dhandle = (s)->dhandle; \
(s)->dhandle = (d); \
e; \
(s)->dhandle = __saved_dhandle; \
} while (0)
#define WT_WITH_BTREE(s, b, e) WT_WITH_DHANDLE(s, (b)->dhandle, e)
/*
* WT_DATA_HANDLE --
* A handle for a generic named data source.
*/
struct __wt_data_handle {
WT_RWLOCK *rwlock; /* Lock for shared/exclusive ops */
SLIST_ENTRY(__wt_data_handle) l;
SLIST_ENTRY(__wt_data_handle) hashl;
/*
* Sessions caching a connection's data handle will have a non-zero
* reference count; sessions using a connection's data handle will
* have a non-zero in-use count.
*/
uint32_t session_ref; /* Sessions referencing this handle */
int32_t session_inuse; /* Sessions using this handle */
time_t timeofdeath; /* Use count went to 0 */
uint64_t name_hash; /* Hash of name */
const char *name; /* Object name as a URI */
const char *checkpoint; /* Checkpoint name (or NULL) */
const char **cfg; /* Configuration information */
WT_DATA_SOURCE *dsrc; /* Data source for this handle */
void *handle; /* Generic handle */
/*
* Data handles can be closed without holding the schema lock; threads
* walk the list of open handles, operating on them (checkpoint is the
* best example). To avoid sources disappearing underneath checkpoint,
* lock the data handle when closing it.
*/
WT_SPINLOCK close_lock; /* Lock to close the handle */
WT_DSRC_STATS stats; /* Data-source statistics */
/* Flags values over 0xff are reserved for WT_BTREE_* */
#define WT_DHANDLE_DISCARD 0x01 /* Discard on release */
#define WT_DHANDLE_DISCARD_CLOSE 0x02 /* Close on release */
#define WT_DHANDLE_EXCLUSIVE 0x04 /* Need exclusive access */
#define WT_DHANDLE_HAVE_REF 0x08 /* Already have ref */
#define WT_DHANDLE_LOCK_ONLY 0x10 /* Handle only used as a lock */
#define WT_DHANDLE_OPEN 0x20 /* Handle is open */
uint32_t flags;
};
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