[mojo] Ports EDK

mojo/edk/system/ports/event.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_EDK_SYSTEM_PORTS_EVENT_H_
+#define MOJO_EDK_SYSTEM_PORTS_EVENT_H_
+
+#include <stdint.h>
+
+#include "mojo/edk/system/ports/message.h"
+#include "mojo/edk/system/ports/name.h"
+#include "mojo/public/c/system/macros.h"
+
+namespace mojo {
+namespace edk {
+namespace ports {
+
+// TODO: Add static assertions of alignment.
+
+struct MOJO_ALIGNAS(8) PortDescriptor {
+  NodeName peer_node_name;
+  PortName peer_port_name;
+  NodeName referring_node_name;
+  PortName referring_port_name;
+  uint64_t next_sequence_num_to_send;
+  uint64_t next_sequence_num_to_receive;
+  uint64_t last_sequence_num_to_receive;
+  bool peer_closed;
+};
+
+enum struct EventType : uint32_t {
+  kUser,
+  kPortAccepted,
+  kObserveProxy,
+  kObserveProxyAck,
+  kObserveClosure,
+};
+
+struct EventHeader {
+  EventType type;
+  uint32_t padding;
+  PortName port_name;
+};
+
+struct UserEventData {
+  uint64_t sequence_num;
+  uint32_t num_ports;
+  uint32_t padding;
+};
+
+struct ObserveProxyEventData {
+  NodeName proxy_node_name;
+  PortName proxy_port_name;
+  NodeName proxy_to_node_name;
+  PortName proxy_to_port_name;
+};
+
+struct ObserveProxyAckEventData {
+  uint64_t last_sequence_num;
+};
+
+struct ObserveClosureEventData {
+  uint64_t last_sequence_num;
+};
+
+inline const EventHeader* GetEventHeader(const Message& message) {
+  return static_cast<const EventHeader*>(message.header_bytes());
+}
+
+inline EventHeader* GetMutableEventHeader(Message* message) {
+  return static_cast<EventHeader*>(message->mutable_header_bytes());
+}
+
+template <typename EventData>
+inline const EventData* GetEventData(const Message& message) {
+  return reinterpret_cast<const EventData*>(
+      reinterpret_cast<const char*>(GetEventHeader(message) + 1));
+}
+
+template <typename EventData>
+inline EventData* GetMutableEventData(Message* message) {
+  return reinterpret_cast<EventData*>(
+      reinterpret_cast<char*>(GetMutableEventHeader(message) + 1));
+}
+
+inline const PortDescriptor* GetPortDescriptors(const UserEventData* event) {
+  return reinterpret_cast<const PortDescriptor*>(
+      reinterpret_cast<const char*>(event + 1));
+}
+
+inline PortDescriptor* GetMutablePortDescriptors(UserEventData* event) {
+  return reinterpret_cast<PortDescriptor*>(reinterpret_cast<char*>(event + 1));
+}
+
+}  // namespace ports
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_PORTS_EVENT_H_