In-process locking.

vfs_lock_debug.go

@@ -0,0 +1,61 @@
+package sqlite3
+
+const assert = true
+
+type vfsDebugLocker struct {
+	state uint32
+}
+
+var _ vfsLocker = &vfsDebugLocker{}
+
+func (l *vfsDebugLocker) LockState() uint32 {
+	return l.state
+}
+
+func (l *vfsDebugLocker) LockShared() uint32 {
+	if assert && !(l.state == _NO_LOCK) {
+		panic(assertErr + " [wz9dcw]")
+	}
+	l.state = _SHARED_LOCK
+	return _OK
+}
+
+func (l *vfsDebugLocker) LockReserved() uint32 {
+	if assert && !(l.state == _SHARED_LOCK) {
+		panic(assertErr + " [m9hcil]")
+	}
+	l.state = _RESERVED_LOCK
+	return _OK
+}
+
+func (l *vfsDebugLocker) LockPending() uint32 {
+	if assert && !(l.state == _SHARED_LOCK || l.state == _RESERVED_LOCK) {
+		panic(assertErr + " [wx8nk2]")
+	}
+	l.state = _PENDING_LOCK
+	return _OK
+}
+
+func (l *vfsDebugLocker) LockExclusive() uint32 {
+	if assert && !(l.state == _PENDING_LOCK) {
+		panic(assertErr + " [84nbax]")
+	}
+	l.state = _EXCLUSIVE_LOCK
+	return _OK
+}
+
+func (l *vfsDebugLocker) DowngradeLock() uint32 {
+	if assert && !(l.state > _SHARED_LOCK) {
+		panic(assertErr + " [je31i3]")
+	}
+	l.state = _SHARED_LOCK
+	return _OK
+}
+
+func (l *vfsDebugLocker) ReleaseLock() uint32 {
+	if assert && !(l.state > _NO_LOCK) {
+		panic(assertErr + " [m6e9w5]")
+	}
+	l.state = _NO_LOCK
+	return _OK
+}