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mdbx: distinct signature of internal objects for LMDB/MDBX modes.

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This commit is contained in:
Leo Yuriev 2016-11-21 21:01:15 +03:00
parent aa4fd0ec76
commit ae61e9ebdf
1 changed files with 9 additions and 3 deletions
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12
mdb.c
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@ -805,11 +805,17 @@ typedef struct MDB_dbx {
void *md_relctx; /**< user-provided context for md_rel */
} MDB_dbx;
#if MDBX_MODE_ENABLED
# define MDBX_MODE_SALT 0
#else
# define MDBX_MODE_SALT 1115449266
#endif
/** A database transaction.
* Every operation requires a transaction handle.
*/
struct MDB_txn {
#define MDBX_MT_SIGNATURE 0x706C553B
#define MDBX_MT_SIGNATURE (0x706C553B^MDBX_MODE_SALT)
unsigned mt_signature;
MDB_txn *mt_parent; /**< parent of a nested txn */
/** Nested txn under this txn, set together with flag #MDB_TXN_HAS_CHILD */
@ -914,7 +920,7 @@ struct MDB_xcursor;
* (A node with #F_DUPDATA but no #F_SUBDATA contains a subpage).
*/
struct MDB_cursor {
#define MDBX_MC_SIGNATURE 0xFE05D5B1
#define MDBX_MC_SIGNATURE (0xFE05D5B1^MDBX_MODE_SALT)
unsigned mc_signature;
/** Next cursor on this DB in this txn */
MDB_cursor *mc_next;
@ -980,7 +986,7 @@ struct MDB_rthc {
};
/** The database environment. */
struct MDB_env {
#define MDBX_ME_SIGNATURE 0x9A899641
#define MDBX_ME_SIGNATURE (0x9A899641^MDBX_MODE_SALT)
unsigned me_signature;
HANDLE me_fd; /**< The main data file */
HANDLE me_lfd; /**< The lock file */