1 files changed, 72 insertions, 0 deletions
diff --git a/src/core/ext/transport/chttp2/transport/context_list.h b/src/core/ext/transport/chttp2/transport/context_list.h
new file mode 100644
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+++ b/src/core/ext/transport/chttp2/transport/context_list.h
@@ -0,0 +1,72 @@
+/*
+ *
+ * Copyright 2018 gRPC 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.
+ *
+ */
+
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/buffer_list.h"
+
+#include "src/core/ext/transport/chttp2/transport/internal.h"
+
+namespace grpc_core {
+/** A list of RPC Contexts */
+class ContextList {
+ public:
+  /* Creates a new element with \a context as the value and appends it to the
+   * list. */
+  static void Append(ContextList** head, grpc_chttp2_stream* s) {
+    /* Make sure context is not already present */
+    GRPC_CHTTP2_STREAM_REF(s, "timestamp");
+
+#ifndef NDEBUG
+    ContextList* ptr = *head;
+    while (ptr != nullptr) {
+      if (ptr->s_ == s) {
+        GPR_ASSERT(
+            false &&
+            "Trying to append a stream that is already present in the list");
+      }
+      ptr = ptr->next_;
+    }
+#endif
+
+    /* Create a new element in the list and add it at the front */
+    ContextList* elem = grpc_core::New<ContextList>();
+    elem->s_ = s;
+    elem->byte_offset_ = s->byte_counter;
+    elem->next_ = *head;
+    *head = elem;
+  }
+
+  /* Executes a function \a fn with each context in the list and \a ts. It also
+   * frees up the entire list after this operation. */
+  static void Execute(void* arg, grpc_core::Timestamps* ts, grpc_error* error);
+
+ private:
+  grpc_chttp2_stream* s_ = nullptr;
+  ContextList* next_ = nullptr;
+  size_t byte_offset_ = 0;
+};
+
+void grpc_http2_set_write_timestamps_callback(
+    void (*fn)(void*, grpc_core::Timestamps*));
+} /* namespace grpc_core */
+
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H */