fix golint issues in core/syncx (#526)

core/syncx/atomicfloat64.go

@@ -5,18 +5,22 @@ import (
 	"sync/atomic"
 )
 
+// An AtomicFloat64 is an implementation of atomic float64.
 type AtomicFloat64 uint64
 
+// NewAtomicFloat64 returns an AtomicFloat64.
 func NewAtomicFloat64() *AtomicFloat64 {
 	return new(AtomicFloat64)
 }
 
+// ForAtomicFloat64 returns an AtomicFloat64 with given val.
 func ForAtomicFloat64(val float64) *AtomicFloat64 {
 	f := NewAtomicFloat64()
 	f.Set(val)
 	return f
 }
 
+// Add adds val to current value.
 func (f *AtomicFloat64) Add(val float64) float64 {
 	for {
 		old := f.Load()
@@ -27,14 +31,17 @@ func (f *AtomicFloat64) Add(val float64) float64 {
 	}
 }
 
+// CompareAndSwap compares current value with old, if equals, set the value to val.
 func (f *AtomicFloat64) CompareAndSwap(old, val float64) bool {
 	return atomic.CompareAndSwapUint64((*uint64)(f), math.Float64bits(old), math.Float64bits(val))
 }
 
+// Load loads the current value.
 func (f *AtomicFloat64) Load() float64 {
 	return math.Float64frombits(atomic.LoadUint64((*uint64)(f)))
 }
 
+// Set sets the current value to val.
 func (f *AtomicFloat64) Set(val float64) {
 	atomic.StoreUint64((*uint64)(f), math.Float64bits(val))
 }