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Add chainlock_read functions to get a read lock. Used in *massively*

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contended tdb's (and I've got one :-).
Jeremy.
(This used to be commit 064fa201ab)
This commit is contained in:
Jeremy Allison 2002-11-09 03:37:01 +00:00
parent 8ce292d96f
commit 02c58f3fb9
2 changed files with 50 additions and 5 deletions
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12
source3/tdb/tdb.c
View File

@ -186,7 +186,7 @@ static int tdb_brlock(TDB_CONTEXT *tdb, tdb_off offset,
if (tdb->flags & TDB_NOLOCK)
return 0;
if (tdb->read_only) {
if ((rw_type == F_WRLCK) && (tdb->read_only)) {
errno = EACCES;
return -1;
}
@ -1802,6 +1802,16 @@ int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key)
return tdb_unlock(tdb, BUCKET(tdb_hash(&key)), F_WRLCK);
}
int tdb_chainlock_read(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_lock(tdb, BUCKET(tdb_hash(&key)), F_RDLCK);
}
int tdb_chainunlock_read(TDB_CONTEXT *tdb, TDB_DATA key)
{
return tdb_unlock(tdb, BUCKET(tdb_hash(&key)), F_RDLCK);
}
/* register a loging function */
void tdb_logging_function(TDB_CONTEXT *tdb, void (*fn)(TDB_CONTEXT *, int , const char *, ...))

41
source3/tdb/tdbutil.c
View File

@ -39,7 +39,7 @@ static void gotalarm_sig(void)
Lock a chain with timeout (in seconds).
****************************************************************************/
int tdb_chainlock_with_timeout( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout)
static int tdb_chainlock_with_timeout( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout, int rw_type)
{
/* Allow tdb_chainlock to be interrupted by an alarm. */
int ret;
@ -51,14 +51,20 @@ int tdb_chainlock_with_timeout( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int tim
alarm(timeout);
}
if (rw_type == F_RDLCK)
ret = tdb_chainlock_read(tdb, key);
else
ret = tdb_chainlock(tdb, key);
if (timeout) {
alarm(0);
CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
if (gotalarm)
if (gotalarm) {
DEBUG(0,("tdb_chainlock_with_timeout: alarm (%u) timed out for key %s in tdb %s\n",
timeout, key.dptr, tdb->name ));
return -1;
}
}
return ret;
}
@ -74,7 +80,7 @@ int tdb_lock_bystring(TDB_CONTEXT *tdb, char *keyval, unsigned int timeout)
key.dptr = keyval;
key.dsize = strlen(keyval)+1;
return tdb_chainlock_with_timeout(tdb, key, timeout);
return tdb_chainlock_with_timeout(tdb, key, timeout, F_WRLCK);
}
/****************************************************************************
@ -91,6 +97,35 @@ void tdb_unlock_bystring(TDB_CONTEXT *tdb, char *keyval)
tdb_chainunlock(tdb, key);
}
/****************************************************************************
Read lock a chain by string. Return -1 if timeout or lock failed.
****************************************************************************/
int tdb_read_lock_bystring(TDB_CONTEXT *tdb, char *keyval, unsigned int timeout)
{
TDB_DATA key;
key.dptr = keyval;
key.dsize = strlen(keyval)+1;
return tdb_chainlock_with_timeout(tdb, key, timeout, F_RDLCK);
}
/****************************************************************************
Read unlock a chain by string.
****************************************************************************/
void tdb_read_unlock_bystring(TDB_CONTEXT *tdb, char *keyval)
{
TDB_DATA key;
key.dptr = keyval;
key.dsize = strlen(keyval)+1;
tdb_chainunlock_read(tdb, key);
}
/****************************************************************************
Fetch a int32 value by a arbitrary blob key, return -1 if not found.
Output is int32 in native byte order.