3 files changed, 25 insertions, 23 deletions

diff --git a/vendor/github.com/ncruces/go-sqlite3/vfs/memdb/memdb.go b/vendor/github.com/ncruces/go-sqlite3/vfs/memdb/memdb.go
index 8dc57ab9c..f21335d8e 100644
--- a/vendor/github.com/ncruces/go-sqlite3/vfs/memdb/memdb.go
+++ b/vendor/github.com/ncruces/go-sqlite3/vfs/memdb/memdb.go
@@ -75,11 +75,6 @@ func (memVFS) FullPathname(name string) (string, error) {
 type memDB struct {
 	name string
 
-	// +checklocks:lockMtx
-	pending *memFile
-	// +checklocks:lockMtx
-	reserved *memFile
-
 	// +checklocks:dataMtx
 	data []*[sectorSize]byte
 
@@ -88,6 +83,10 @@ type memDB struct {
 
 	// +checklocks:lockMtx
 	shared int
+	// +checklocks:lockMtx
+	reserved bool
+	// +checklocks:lockMtx
+	pending bool
 
 	// +checklocks:memoryMtx
 	refs int
@@ -214,24 +213,24 @@ func (m *memFile) Lock(lock vfs.LockLevel) error {
 
 	switch lock {
 	case vfs.LOCK_SHARED:
-		if m.pending != nil {
+		if m.pending {
 			return sqlite3.BUSY
 		}
 		m.shared++
 
 	case vfs.LOCK_RESERVED:
-		if m.reserved != nil {
+		if m.reserved {
 			return sqlite3.BUSY
 		}
-		m.reserved = m
+		m.reserved = true
 
 	case vfs.LOCK_EXCLUSIVE:
 		if m.lock < vfs.LOCK_PENDING {
-			if m.pending != nil {
+			if m.pending {
 				return sqlite3.BUSY
 			}
 			m.lock = vfs.LOCK_PENDING
-			m.pending = m
+			m.pending = true
 		}
 
 		for before := time.Now(); m.shared > 1; {
@@ -256,11 +255,11 @@ func (m *memFile) Unlock(lock vfs.LockLevel) error {
 	m.lockMtx.Lock()
 	defer m.lockMtx.Unlock()
 
-	if m.pending == m {
-		m.pending = nil
+	if m.pending && m.lock >= vfs.LOCK_PENDING {
+		m.pending = false
 	}
-	if m.reserved == m {
-		m.reserved = nil
+	if m.reserved && m.lock >= vfs.LOCK_RESERVED {
+		m.reserved = false
 	}
 	if lock < vfs.LOCK_SHARED {
 		m.shared--
@@ -275,7 +274,7 @@ func (m *memFile) CheckReservedLock() (bool, error) {
 	}
 	m.lockMtx.Lock()
 	defer m.lockMtx.Unlock()
-	return m.reserved != nil, nil
+	return m.reserved, nil
 }
 
 func (m *memFile) SectorSize() int {
diff --git a/vendor/github.com/ncruces/go-sqlite3/vfs/shm.go b/vendor/github.com/ncruces/go-sqlite3/vfs/shm.go
index 58da34df4..7b0d4b677 100644
--- a/vendor/github.com/ncruces/go-sqlite3/vfs/shm.go
+++ b/vendor/github.com/ncruces/go-sqlite3/vfs/shm.go
@@ -125,6 +125,9 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
 		return 0, _IOERR_SHMMAP
 	}
 	s.regions = append(s.regions, r)
+	if s.readOnly {
+		return r.Ptr, _READONLY
+	}
 	return r.Ptr, _OK
 }
 
diff --git a/vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go b/vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go
index 3b45b3087..8c2abee81 100644
--- a/vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go
+++ b/vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go
@@ -101,13 +101,13 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
 		return _OK
 	}
 
-	// Open file read-write, as it will be shared.
+	// Always open file read-write, as it will be shared.
 	f, err := os.OpenFile(s.path,
 		unix.O_RDWR|unix.O_CREAT|unix.O_NOFOLLOW, 0666)
 	if err != nil {
 		return _CANTOPEN
 	}
-	// Close if file if it's not nil.
+	// Closes file if it's not nil.
 	defer func() { f.Close() }()
 
 	fi, err := f.Stat()
@@ -145,17 +145,14 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
 		info: fi,
 		refs: 1,
 	}
-	f = nil
-	add := true
+	f = nil // Don't close the file.
 	for i, g := range vfsShmFiles {
 		if g == nil {
 			vfsShmFiles[i] = s.vfsShmFile
-			add = false
+			return rc
 		}
 	}
-	if add {
-		vfsShmFiles = append(vfsShmFiles, s.vfsShmFile)
-	}
+	vfsShmFiles = append(vfsShmFiles, s.vfsShmFile)
 	return rc
 }
 
@@ -195,6 +192,9 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
 		return 0, _IOERR_SHMMAP
 	}
 	s.regions = append(s.regions, r)
+	if s.readOnly {
+		return r.Ptr, _READONLY
+	}
 	return r.Ptr, _OK
 }