Update dependencies/vendor (#1659)

1 files changed, 28 insertions, 6 deletions

diff --git a/vendor/go.uber.org/atomic/float64_ext.go b/vendor/go.uber.org/atomic/float64_ext.go
index 927b1add..df36b010 100644
--- a/vendor/go.uber.org/atomic/float64_ext.go
+++ b/vendor/go.uber.org/atomic/float64_ext.go
@@ -20,15 +20,18 @@
 
 package atomic
 
-import "strconv"
+import (
+	"math"
+	"strconv"
+)
 
-//go:generate bin/gen-atomicwrapper -name=Float64 -type=float64 -wrapped=Uint64 -pack=math.Float64bits -unpack=math.Float64frombits -cas -json -imports math -file=float64.go
+//go:generate bin/gen-atomicwrapper -name=Float64 -type=float64 -wrapped=Uint64 -pack=math.Float64bits -unpack=math.Float64frombits -swap -json -imports math -file=float64.go
 
 // Add atomically adds to the wrapped float64 and returns the new value.
-func (f *Float64) Add(s float64) float64 {
+func (f *Float64) Add(delta float64) float64 {
 	for {
 		old := f.Load()
-		new := old + s
+		new := old + delta
 		if f.CAS(old, new) {
 			return new
 		}
@@ -36,8 +39,27 @@ func (f *Float64) Add(s float64) float64 {
 }
 
 // Sub atomically subtracts from the wrapped float64 and returns the new value.
-func (f *Float64) Sub(s float64) float64 {
-	return f.Add(-s)
+func (f *Float64) Sub(delta float64) float64 {
+	return f.Add(-delta)
+}
+
+// CAS is an atomic compare-and-swap for float64 values.
+//
+// Note: CAS handles NaN incorrectly. NaN != NaN using Go's inbuilt operators
+// but CAS allows a stored NaN to compare equal to a passed in NaN.
+// This avoids typical CAS loops from blocking forever, e.g.,
+//
+//   for {
+//     old := atom.Load()
+//     new = f(old)
+//     if atom.CAS(old, new) {
+//       break
+//     }
+//   }
+//
+// If CAS did not match NaN to match, then the above would loop forever.
+func (f *Float64) CAS(old, new float64) (swapped bool) {
+	return f.v.CAS(math.Float64bits(old), math.Float64bits(new))
 }
 
 // String encodes the wrapped value as a string.