*: Support LOCK/UNLOCK TABLES feature

config/config.go

@@ -87,6 +87,9 @@ type Config struct {
 	// TreatOldVersionUTF8AsUTF8MB4 is use to treat old version table/column UTF8 charset as UTF8MB4. This is for compatibility.
 	// Currently not support dynamic modify, because this need to reload all old version schema.
 	TreatOldVersionUTF8AsUTF8MB4 bool `toml:"treat-old-version-utf8-as-utf8mb4" json:"treat-old-version-utf8-as-utf8mb4"`
+	// EnableTableLock indicate whether enable table lock.
+	// TODO: remove this after table lock features stable.
+	EnableTableLock bool `toml:"enable-table-lock" json:"enable-table-lock"`
 }
 
 // Log is the log section of config.
@@ -321,6 +324,7 @@ var defaultConf = Config{
 	EnableStreaming:              false,
 	CheckMb4ValueInUTF8:          true,
 	TreatOldVersionUTF8AsUTF8MB4: true,
+	EnableTableLock:              false,
 	TxnLocalLatches: TxnLocalLatches{
 		Enabled:  true,
 		Capacity: 2048000,
@@ -574,6 +578,11 @@ func hasRootPrivilege() bool {
 	return os.Geteuid() == 0
 }
 
+// TableLockEnabled uses to check whether enabled the table lock feature.
+func TableLockEnabled() bool {
+	return GetGlobalConfig().EnableTableLock
+}
+
 // ToLogConfig converts *Log to *logutil.LogConfig.
 func (l *Log) ToLogConfig() *logutil.LogConfig {
 	return logutil.NewLogConfig(l.Level, l.Format, l.SlowQueryFile, l.File, l.DisableTimestamp)

config/config.toml.example

@@ -54,6 +54,9 @@ check-mb4-value-in-utf8 = true
 # treat-old-version-utf8-as-utf8mb4 use for upgrade compatibility. Set to true will treat old version table/column UTF8 charset as UTF8MB4.
 treat-old-version-utf8-as-utf8mb4 = true
 
+# enable-table-lock is used to control table lock feature. Default is false, indicate the table lock feature is disabled.
+enable-table-lock = false
+
 [log]
 # Log level: debug, info, warn, error, fatal.
 level = "info"

config/config_test.go

@@ -60,6 +60,7 @@ unrecognized-option-test = true
 
 	_, err = f.WriteString(`
 token-limit = 0
+enable-table-lock = true
 [performance]
 [tikv-client]
 commit-timeout="41s"
@@ -78,6 +79,7 @@ max-batch-size=128
 	c.Assert(conf.TiKVClient.CommitTimeout, Equals, "41s")
 	c.Assert(conf.TiKVClient.MaxBatchSize, Equals, uint(128))
 	c.Assert(conf.TokenLimit, Equals, uint(1000))
+	c.Assert(conf.EnableTableLock, IsTrue)
 	c.Assert(f.Close(), IsNil)
 	c.Assert(os.Remove(configFile), IsNil)