add Remove/Clear functions for gmlock

g/os/gmlock/gmlock.go

@@ -82,3 +82,8 @@ func TryLockFunc(key string, f func()) bool {
 func TryRLockFunc(key string, f func()) bool {
 	return locker.TryRLockFunc(key, f)
 }
+
+// Remove removes mutex with given <key>.
+func Remove(key string) {
+	locker.Remove(key)
+}

g/os/gmlock/gmlock_locker.go

@@ -12,7 +12,8 @@ import (
 )
 
 // Memory locker.
-// Note that there's no cache expire mechanism for attribute map <m>.
+// Note that there's no cache expire mechanism for mutex in locker.
+// You need remove certain mutex manually when you do not want use it any more.
 type Locker struct {
 	m *gmap.StrAnyMap
 }
@@ -113,6 +114,16 @@ func (l *Locker) TryRLockFunc(key string, f func()) bool {
 	return false
 }
 
+// Remove removes mutex with given <key> from locker.
+func (l *Locker) Remove(key string) {
+	l.m.Remove(key)
+}
+
+// Clear removes all mutexes from locker.
+func (l *Locker) Clear() {
+	l.m.Clear()
+}
+
 // getOrNewMutex returns the mutex of given <key> if it exists,
 // or else creates and returns a new one.
 func (l *Locker) getOrNewMutex(key string) *gmutex.Mutex {