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lmdb: added mdb_env_open_ex() and exclusive/monopoly mode for mdb_chk.

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Change-Id: I867e7f17924ffecb744440e95db96c0a7411d6ef
This commit is contained in:
Leo Yuriev
2015-08-07 20:05:10 +03:00
parent 59b74d5df0
commit 96d69e3fa1
3 changed files with 42 additions and 21 deletions
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22
mdb.c
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@@ -4345,8 +4345,6 @@ mdb_env_share_locks(MDB_env *env, int *excl, MDB_meta *meta)
struct flock lock_info;
int rc = 0;
env->me_txns->mti_txnid = meta->mm_txnid;
/* The shared lock replaces the existing lock */
memset((void *)&lock_info, 0, sizeof(lock_info));
lock_info.l_type = F_RDLCK;
@@ -4600,6 +4598,12 @@ fail:
int ESECT
mdb_env_open(MDB_env *env, const char *path, unsigned flags, mode_t mode)
{
return mdb_env_open_ex(env, path, flags, mode, NULL);
}
int ESECT
mdb_env_open_ex(MDB_env *env, const char *path, unsigned flags, mode_t mode, int *exclusive)
{
int oflags, rc, len, excl = -1;
char *lpath, *dpath;
@@ -4678,9 +4682,17 @@ mdb_env_open(MDB_env *env, const char *path, unsigned flags, mode_t mode)
if ((rc = mdb_env_open2(env, &meta)) == MDB_SUCCESS) {
mdb_debug("opened dbenv %p", (void *) env);
if (excl > 0) {
rc = mdb_env_share_locks(env, &excl, &meta);
if (rc)
goto leave;
env->me_txns->mti_txnid = meta.mm_txnid;
if (exclusive == NULL || *exclusive < 2) {
/* LY: downgrade lock only if exclusive access not requested.
* in case exclusive==1, just leave value as is. */
rc = mdb_env_share_locks(env, &excl, &meta);
if (rc)
goto leave;
}
} else if (exclusive) {
/* LY: just indicate that is not an exclusive access. */
*exclusive = 0;
}
if (!(flags & MDB_RDONLY)) {
MDB_txn *txn;