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Add mdb.c:txnid_t for readability.

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Maybe later we'll test txnid wraparound with it defined to ushort.
This commit is contained in:
Hallvard Furuseth 2011-09-10 10:11:56 +02:00
parent bf9d722bec
commit b1cfff4aeb
1 changed files with 15 additions and 10 deletions
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25
libraries/libmdb/mdb.c
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@ -168,6 +168,11 @@
*/
typedef ULONG pgno_t;
/** A transaction ID.
* See struct MDB_txn.mt_txnid for details.
*/
typedef ULONG txnid_t;
/** @defgroup debug Debug Macros
* @{
*/
@ -382,7 +387,7 @@ typedef struct MDB_rxbody {
* started from so we can avoid overwriting any data used in that
* particular version.
*/
ULONG mrb_txnid;
txnid_t mrb_txnid;
/** The process ID of the process owning this reader txn. */
pid_t mrb_pid;
/** The thread ID of the thread owning this txn. */
@ -431,7 +436,7 @@ typedef struct MDB_txbody {
* This is recorded here only for convenience; the value can always
* be determined by reading the main database meta pages.
*/
ULONG mtb_txnid;
txnid_t mtb_txnid;
/** The number of slots that have been used in the reader table.
* This always records the maximum count, it is not decremented
* when readers release their slots.
@ -641,7 +646,7 @@ typedef struct MDB_meta {
/** Any persistent environment flags. @ref mdb_env */
#define mm_flags mm_dbs[0].md_flags
pgno_t mm_last_pg; /**< last used page in file */
ULONG mm_txnid; /**< txnid that committed this page */
txnid_t mm_txnid; /**< txnid that committed this page */
} MDB_meta;
/** Auxiliary DB info.
@ -669,7 +674,7 @@ struct MDB_txn {
* Only committed write transactions increment the ID. If a transaction
* aborts, the ID may be re-used by the next writer.
*/
ULONG mt_txnid;
txnid_t mt_txnid;
MDB_env *mt_env; /**< the DB environment */
/** The list of pages that became unused during this transaction.
* This is an #IDL.
@ -754,7 +759,7 @@ typedef struct MDB_oldpages {
*/
struct MDB_oldpages *mo_next;
/** The ID of the transaction in which these pages were freed. */
ULONG mo_txnid;
txnid_t mo_txnid;
/** An #IDL of the pages */
pgno_t mo_pages[1]; /* dynamic */
} MDB_oldpages;
@ -966,7 +971,7 @@ mdb_alloc_page(MDB_cursor *mc, int num)
/* See if there's anything in the free DB */
MDB_cursor m2;
MDB_node *leaf;
ULONG *kptr, oldest;
txnid_t *kptr, oldest;
m2.mc_txn = txn;
m2.mc_dbi = FREE_DBI;
@ -974,13 +979,13 @@ mdb_alloc_page(MDB_cursor *mc, int num)
m2.mc_flags = 0;
mdb_search_page(&m2, NULL, 0);
leaf = NODEPTR(m2.mc_pg[m2.mc_top], 0);
kptr = (ULONG *)NODEKEY(leaf);
kptr = (txnid_t *)NODEKEY(leaf);
{
unsigned int i;
oldest = txn->mt_txnid - 1;
for (i=0; i<txn->mt_env->me_txns->mti_numreaders; i++) {
ULONG mr = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
txnid_t mr = txn->mt_env->me_txns->mti_readers[i].mr_txnid;
if (mr && mr < oldest)
oldest = mr;
}
@ -1374,7 +1379,7 @@ mdb_txn_commit(MDB_txn *txn)
#endif
/* write to last page of freeDB */
key.mv_size = sizeof(pgno_t);
key.mv_data = (char *)&txn->mt_txnid;
key.mv_data = &txn->mt_txnid;
data.mv_data = txn->mt_free_pgs;
/* The free list can still grow during this call,
* despite the pre-emptive touches above. So check
@ -1397,7 +1402,7 @@ mdb_txn_commit(MDB_txn *txn)
mop = env->me_pghead;
key.mv_size = sizeof(pgno_t);
key.mv_data = (char *)&mop->mo_txnid;
key.mv_data = &mop->mo_txnid;
data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages);
data.mv_data = mop->mo_pages;
mdb_cursor_put(&mc, &key, &data, 0);