X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb%2Flock.c;h=6809ce37d87513986cc54fab82251004379557cb;hp=f156c0fa7b2e548640d47db23df71c9427ec73ce;hb=86c41caf70e0189d5604569eab052e814d294f39;hpb=7104b7bc2e7f9829891477dbb04a9df926a656a7

diff --git a/ccan/tdb/lock.c b/ccan/tdb/lock.c
index f156c0fa..6809ce37 100644
--- a/ccan/tdb/lock.c
+++ b/ccan/tdb/lock.c
@@ -302,6 +302,7 @@ int tdb_unlock(struct tdb_context *tdb, int list, int ltype)
 int tdb_transaction_lock(struct tdb_context *tdb, int ltype)
 {
 	if (tdb->have_transaction_lock || tdb->global_lock.count) {
+		tdb->have_transaction_lock++;
 		return 0;
 	}
 	if (tdb->methods->tdb_brlock(tdb, TRANSACTION_LOCK, ltype, 
@@ -310,7 +311,7 @@ int tdb_transaction_lock(struct tdb_context *tdb, int ltype)
 		tdb->ecode = TDB_ERR_LOCK;
 		return -1;
 	}
-	tdb->have_transaction_lock = 1;
+	tdb->have_transaction_lock++;
 	return 0;
 }
 
@@ -319,15 +320,10 @@ int tdb_transaction_lock(struct tdb_context *tdb, int ltype)
  */
 int tdb_transaction_unlock(struct tdb_context *tdb)
 {
-	int ret;
-	if (!tdb->have_transaction_lock) {
+	if (--tdb->have_transaction_lock) {
 		return 0;
 	}
-	ret = tdb->methods->tdb_brlock(tdb, TRANSACTION_LOCK, F_UNLCK, F_SETLKW, 0, 1);
-	if (ret == 0) {
-		tdb->have_transaction_lock = 0;
-	}
-	return ret;
+	return tdb->methods->tdb_brlock(tdb, TRANSACTION_LOCK, F_UNLCK, F_SETLKW, 0, 1);
 }
 
 
@@ -413,48 +409,58 @@ static int _tdb_unlockall(struct tdb_context *tdb, int ltype)
 /* lock entire database with write lock */
 int tdb_lockall(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_lockall");
 	return _tdb_lockall(tdb, F_WRLCK, F_SETLKW);
 }
 
 /* lock entire database with write lock - mark only */
 int tdb_lockall_mark(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_lockall_mark");
 	return _tdb_lockall(tdb, F_WRLCK | TDB_MARK_LOCK, F_SETLKW);
 }
 
 /* unlock entire database with write lock - unmark only */
 int tdb_lockall_unmark(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_lockall_unmark");
 	return _tdb_unlockall(tdb, F_WRLCK | TDB_MARK_LOCK);
 }
 
 /* lock entire database with write lock - nonblocking varient */
 int tdb_lockall_nonblock(struct tdb_context *tdb)
 {
-	return _tdb_lockall(tdb, F_WRLCK, F_SETLK);
+	int ret = _tdb_lockall(tdb, F_WRLCK, F_SETLK);
+	tdb_trace_ret(tdb, "tdb_lockall_nonblock", ret);
+	return ret;
 }
 
 /* unlock entire database with write lock */
 int tdb_unlockall(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_unlockall");
 	return _tdb_unlockall(tdb, F_WRLCK);
 }
 
 /* lock entire database with read lock */
 int tdb_lockall_read(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_lockall_read");
 	return _tdb_lockall(tdb, F_RDLCK, F_SETLKW);
 }
 
 /* lock entire database with read lock - nonblock varient */
 int tdb_lockall_read_nonblock(struct tdb_context *tdb)
 {
-	return _tdb_lockall(tdb, F_RDLCK, F_SETLK);
+	int ret = _tdb_lockall(tdb, F_RDLCK, F_SETLK);
+	tdb_trace_ret(tdb, "tdb_lockall_read_nonblock", ret);
+	return ret;
 }
 
 /* unlock entire database with read lock */
 int tdb_unlockall_read(struct tdb_context *tdb)
 {
+	tdb_trace(tdb, "tdb_unlockall_read");
 	return _tdb_unlockall(tdb, F_RDLCK);
 }
 
@@ -462,7 +468,9 @@ int tdb_unlockall_read(struct tdb_context *tdb)
    contention - it cannot guarantee how many records will be locked */
 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key)
 {
-	return tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
+	int ret = tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
+	tdb_trace_1rec(tdb, "tdb_chainlock", key);
+	return ret;
 }
 
 /* lock/unlock one hash chain, non-blocking. This is meant to be used
@@ -470,38 +478,46 @@ int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key)
    locked */
 int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key)
 {
-	return tdb_lock_nonblock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
+	int ret = tdb_lock_nonblock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
+	tdb_trace_1rec_ret(tdb, "tdb_chainlock_nonblock", key, ret);
+	return ret;
 }
 
 /* mark a chain as locked without actually locking it. Warning! use with great caution! */
 int tdb_chainlock_mark(struct tdb_context *tdb, TDB_DATA key)
 {
-	return tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK | TDB_MARK_LOCK);
+	int ret = tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK | TDB_MARK_LOCK);
+	tdb_trace_1rec(tdb, "tdb_chainlock_mark", key);
+	return ret;
 }
 
 /* unmark a chain as locked without actually locking it. Warning! use with great caution! */
 int tdb_chainlock_unmark(struct tdb_context *tdb, TDB_DATA key)
 {
+	tdb_trace_1rec(tdb, "tdb_chainlock_unmark", key);
 	return tdb_unlock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK | TDB_MARK_LOCK);
 }
 
 int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key)
 {
+	tdb_trace_1rec(tdb, "tdb_chainlock", key);
 	return tdb_unlock(tdb, BUCKET(tdb->hash_fn(&key)), F_WRLCK);
 }
 
 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key)
 {
-	return tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_RDLCK);
+	int ret;
+	ret = tdb_lock(tdb, BUCKET(tdb->hash_fn(&key)), F_RDLCK);
+	tdb_trace_1rec(tdb, "tdb_chainlock_read", key);
+	return ret;
 }
 
 int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key)
 {
+	tdb_trace_1rec(tdb, "tdb_chainunlock_read", key);
 	return tdb_unlock(tdb, BUCKET(tdb->hash_fn(&key)), F_RDLCK);
 }
 
-
-
 /* record lock stops delete underneath */
 int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off)
 {