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/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/* Character constants for projection plans */
#define WT_PROJ_KEY 'k' /* Go to key in cursor <arg> */
#define WT_PROJ_NEXT 'n' /* Process the next item (<arg> repeats) */
#define WT_PROJ_REUSE 'r' /* Reuse the previous item (<arg> repeats) */
#define WT_PROJ_SKIP 's' /* Skip a column in the cursor (<arg> repeats) */
#define WT_PROJ_VALUE 'v' /* Go to the value in cursor <arg> */
struct __wt_colgroup {
const char *name; /* Logical name */
const char *source; /* Underlying data source */
const char *config; /* Configuration string */
WT_CONFIG_ITEM colconf; /* List of columns from config */
};
struct __wt_index {
const char *name; /* Logical name */
const char *source; /* Underlying data source */
const char *config; /* Configuration string */
WT_CONFIG_ITEM colconf; /* List of columns from config */
const char *idxkey_format; /* Index key format (hides primary) */
const char *key_format; /* Key format */
const char *key_plan; /* Key projection plan */
const char *value_plan; /* Value projection plan */
};
/*
* WT_TABLE --
* Handle for a logical table. A table consists of one or more column
* groups, each of which holds some set of columns all sharing a primary
* key; and zero or more indices, each of which holds some set of columns
* in an index key that can be used to reconstruct the primary key.
*/
struct __wt_table {
const char *name, *config, *plan;
const char *key_format, *value_format;
WT_CONFIG_ITEM cgconf, colconf;
WT_COLGROUP **cgroups;
WT_INDEX **indices;
size_t idx_alloc;
TAILQ_ENTRY(__wt_table) q;
int cg_complete, idx_complete, is_simple;
u_int ncolgroups, nindices, nkey_columns;
uint32_t refcnt; /* Number of open cursors */
uint32_t schema_gen; /* Cached schema generation number */
};
/*
* Tables without explicit column groups have a single default column group
* containing all of the columns.
*/
#define WT_COLGROUPS(t) WT_MAX((t)->ncolgroups, 1)
#define WT_WITH_SCHEMA_LOCK(session, op) do { \
int __schema_locked = 0; \
WT_DECL_SPINLOCK_ID(__id); /* Must appear last */ \
WT_ASSERT(session, \
F_ISSET(session, WT_SESSION_SCHEMA_LOCKED) || \
!F_ISSET(session, WT_SESSION_NO_SCHEMA_LOCK)); \
while (!F_ISSET(session, WT_SESSION_SCHEMA_LOCKED)) \
if (session->skip_schema_lock || __wt_spin_trylock( \
session, &S2C(session)->schema_lock, &__id) == 0) { \
F_SET(session, WT_SESSION_SCHEMA_LOCKED); \
__schema_locked = 1; \
} else \
__wt_yield(); \
(op); \
if (__schema_locked) { \
F_CLR(session, WT_SESSION_SCHEMA_LOCKED); \
if (!session->skip_schema_lock) \
__wt_spin_unlock( \
session, &S2C(session)->schema_lock); \
} \
} while (0)
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