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MDB_LOCK_VERSION -> MDB_LOCK_FORMAT.

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Pid locking needs a different lockfile-version: MDB_env's with and
without pid locking must not coexist, they can sabotage each other.
Store MDB_LOCK_FORMAT = (version | "use locking" flag) instead.
This commit is contained in:
Hallvard Furuseth 2013-08-08 19:43:04 +02:00
parent 1878213092
commit d66739f947
1 changed files with 20 additions and 9 deletions
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29
libraries/liblmdb/mdb.c
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@ -140,6 +140,7 @@
* @{
*/
#ifdef _WIN32
#define MDB_PIDLOCK 0
#define pthread_t DWORD
#define pthread_mutex_t HANDLE
#define pthread_key_t DWORD
@ -172,6 +173,9 @@
#define Z "z"
/** For MDB_LOCK_FORMAT: True if readers take a pid lock in the lockfile */
#define MDB_PIDLOCK 1
#ifdef MDB_USE_POSIX_SEM
#define LOCK_MUTEX_R(env) mdb_sem_wait((env)->me_rmutex)
@ -523,8 +527,8 @@ typedef struct MDB_txbody {
/** Stamp identifying this as an MDB file. It must be set
* to #MDB_MAGIC. */
uint32_t mtb_magic;
/** Version number of this lock file. Must be set to #MDB_LOCK_VERSION. */
uint32_t mtb_version;
/** Format of this lock file. Must be set to #MDB_LOCK_FORMAT. */
uint32_t mtb_format;
#if defined(_WIN32) || defined(MDB_USE_POSIX_SEM)
char mtb_rmname[MNAME_LEN];
#else
@ -550,7 +554,7 @@ typedef struct MDB_txninfo {
union {
MDB_txbody mtb;
#define mti_magic mt1.mtb.mtb_magic
#define mti_version mt1.mtb.mtb_version
#define mti_format mt1.mtb.mtb_format
#define mti_mutex mt1.mtb.mtb_mutex
#define mti_rmname mt1.mtb.mtb_rmname
#define mti_txnid mt1.mtb.mtb_txnid
@ -569,6 +573,13 @@ typedef struct MDB_txninfo {
} mt2;
MDB_reader mti_readers[1];
} MDB_txninfo;
/** Lockfile format signature: version, features and field layout */
#define MDB_LOCK_FORMAT \
((uint32_t) \
((MDB_LOCK_VERSION) \
/* Flags which describe functionality */ \
+ (((MDB_PIDLOCK) != 0) << 16)))
/** @} */
/** Common header for all page types.
@ -2013,7 +2024,7 @@ mdb_cursors_close(MDB_txn *txn, unsigned merge)
static void
mdb_txn_reset0(MDB_txn *txn, const char *act);
#ifdef _WIN32
#if !(MDB_PIDLOCK) /* Currently the same as defined(_WIN32) */
enum Pidlock_op {
Pidset, Pidcheck
};
@ -2034,7 +2045,7 @@ enum Pidlock_op {
static int
mdb_reader_pid(MDB_env *env, enum Pidlock_op op, pid_t pid)
{
#ifdef _WIN32
#if !(MDB_PIDLOCK) /* Currently the same as defined(_WIN32) */
int ret = 0;
HANDLE h;
if (op == Pidcheck) {
@ -3776,8 +3787,8 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
pthread_mutexattr_destroy(&mattr);
#endif /* _WIN32 || MDB_USE_POSIX_SEM */
env->me_txns->mti_version = MDB_LOCK_VERSION;
env->me_txns->mti_magic = MDB_MAGIC;
env->me_txns->mti_format = MDB_LOCK_FORMAT;
env->me_txns->mti_txnid = 0;
env->me_txns->mti_numreaders = 0;
@ -3787,9 +3798,9 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
rc = MDB_INVALID;
goto fail;
}
if (env->me_txns->mti_version != MDB_LOCK_VERSION) {
DPRINTF("lock region is version %u, expected version %u",
env->me_txns->mti_version, MDB_LOCK_VERSION);
if (env->me_txns->mti_format != MDB_LOCK_FORMAT) {
DPRINTF("lock region has format+version 0x%x, expected 0x%x",
env->me_txns->mti_format, MDB_LOCK_FORMAT);
rc = MDB_VERSION_MISMATCH;
goto fail;
}