Merge 216da0b7 (automated)

1 files changed, 46 insertions, 0 deletions

diff --git a/pkg/tcpip/transport/tcp/segment_heap.go b/pkg/tcpip/transport/tcp/segment_heap.go
new file mode 100644
index 000000000..9fd061d7d
--- /dev/null
+++ b/pkg/tcpip/transport/tcp/segment_heap.go
@@ -0,0 +1,46 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcp
+
+type segmentHeap []*segment
+
+// Len returns the length of h.
+func (h segmentHeap) Len() int {
+	return len(h)
+}
+
+// Less determines whether the i-th element of h is less than the j-th element.
+func (h segmentHeap) Less(i, j int) bool {
+	return h[i].sequenceNumber.LessThan(h[j].sequenceNumber)
+}
+
+// Swap swaps the i-th and j-th elements of h.
+func (h segmentHeap) Swap(i, j int) {
+	h[i], h[j] = h[j], h[i]
+}
+
+// Push adds x as the last element of h.
+func (h *segmentHeap) Push(x interface{}) {
+	*h = append(*h, x.(*segment))
+}
+
+// Pop removes the last element of h and returns it.
+func (h *segmentHeap) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[:n-1]
+	return x
+}