Fix race error

#598

Author: gjrtimmer

driver/driver.go

@@ -33,6 +33,7 @@ import "C"
 import (
 	"database/sql"
 	"database/sql/driver"
+	"sync"
 )
 
 var (
@@ -45,13 +46,17 @@ func init() {
 
 // SQLiteDriver implement sql.Driver.
 type SQLiteDriver struct {
+	mu          sync.Mutex
 	Config      *Config
 	Extensions  []string
 	ConnectHook func(*SQLiteConn) error
 }
 
 // Open database and return a new connection.
 func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
 	cfg, err := ParseDSN(dsn)
 	if err != nil {
 		return nil, err

driver/driver_go110.go

@@ -22,6 +22,9 @@ var (
 // The two-step sequence allows drivers to parse the name just once and also provides
 // access to per-Conn contexts.
 func (d *SQLiteDriver) OpenConnector(dsn string) (driver.Connector, error) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
 	cfg, err := ParseDSN(dsn)
 	if err != nil {
 		return nil, err