1 files changed, 31 insertions, 0 deletions
diff --git a/src/vendor/golang.org/x/net/quic/atomic_bits.go b/src/vendor/golang.org/x/net/quic/atomic_bits.go
new file mode 100644
index 0000000000..5244e04201
--- /dev/null
+++ b/src/vendor/golang.org/x/net/quic/atomic_bits.go
@@ -0,0 +1,31 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quic
+
+import "sync/atomic"
+
+// atomicBits is an atomic uint32 that supports setting individual bits.
+type atomicBits[T ~uint32] struct {
+	bits atomic.Uint32
+}
+
+// set sets the bits in mask to the corresponding bits in v.
+// It returns the new value.
+func (a *atomicBits[T]) set(v, mask T) T {
+	if v&^mask != 0 {
+		panic("BUG: bits in v are not in mask")
+	}
+	for {
+		o := a.bits.Load()
+		n := (o &^ uint32(mask)) | uint32(v)
+		if a.bits.CompareAndSwap(o, n) {
+			return T(n)
+		}
+	}
+}
+
+func (a *atomicBits[T]) load() T {
+	return T(a.bits.Load())
+}