Mojo: Armed Watchers

mojo/edk/system/data_pipe_producer_dispatcher.h

 // Copyright 2013 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_DATA_PIPE_PRODUCER_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "mojo/edk/embedder/platform_handle_vector.h"
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/awakable_list.h"
 #include "mojo/edk/system/dispatcher.h"
 #include "mojo/edk/system/ports/port_ref.h"
 #include "mojo/edk/system/system_impl_export.h"
+#include "mojo/edk/system/watcher_set.h"
 
 namespace mojo {
 namespace edk {
 
 struct DataPipeControlMessage;
 class NodeController;
 
 // This is the Dispatcher implementation for the producer handle for data
 // pipes created by the Mojo primitive MojoCreateDataPipe(). This class is
 // thread-safe.
 class MOJO_SYSTEM_IMPL_EXPORT DataPipeProducerDispatcher final
     : public Dispatcher {
  public:
   DataPipeProducerDispatcher(
       NodeController* node_controller,
       const ports::PortRef& port,
       scoped_refptr<PlatformSharedBuffer> shared_ring_buffer,
       const MojoCreateDataPipeOptions& options,
       bool initialized,
       uint64_t pipe_id);
 
   // Dispatcher:
   Type GetType() const override;
   MojoResult Close() override;
-  MojoResult Watch(MojoHandleSignals signals,
-                   const Watcher::WatchCallback& callback,
-                   uintptr_t context) override;
-  MojoResult CancelWatch(uintptr_t context) override;
+  MojoResult RegisterWatcher(MojoHandleSignals signals,
+                             const Watcher::WatchCallback& callback,
+                             uintptr_t context) override;
+  MojoResult ArmWatcher(uintptr_t context) override;
+  MojoResult UnregisterWatcher(uintptr_t context) override;
   MojoResult WriteData(const void* elements,
                        uint32_t* num_bytes,
                        MojoReadDataFlags flags) override;
   MojoResult BeginWriteData(void** buffer,
                             uint32_t* buffer_num_bytes,
                             MojoWriteDataFlags flags) override;
   MojoResult EndWriteData(uint32_t num_bytes_written) override;
   HandleSignalsState GetHandleSignalsState() const override;
   MojoResult AddAwakable(Awakable* awakable,
                          MojoHandleSignals signals,
@@ skipping 37 matching lines @@
 
   const MojoCreateDataPipeOptions options_;
   NodeController* const node_controller_;
   const ports::PortRef control_port_;
   const uint64_t pipe_id_;
 
   // Guards access to the fields below.
   mutable base::Lock lock_;
 
   AwakableList awakable_list_;
+  WatcherSet watchers_;
 
   bool buffer_requested_ = false;
 
   scoped_refptr<PlatformSharedBuffer> shared_ring_buffer_;
   std::unique_ptr<PlatformSharedBufferMapping> ring_buffer_mapping_;
   ScopedPlatformHandle buffer_handle_for_transit_;
 
   bool in_transit_ = false;
   bool is_closed_ = false;
   bool peer_closed_ = false;
   bool transferred_ = false;
   bool in_two_phase_write_ = false;
 
   uint32_t write_offset_ = 0;
   uint32_t available_capacity_;
 
   DISALLOW_COPY_AND_ASSIGN(DataPipeProducerDispatcher);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_