Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

TODOs in future cls:
-POSIX
-use shared memory for MessagePipeDispatcher serialization
-work in Windows sandbox (using master.mojom which is implemented but not hooked up in this change)
-XP

BUG=478251
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1350023003

Cr-Commit-Position: refs/heads/master@{#352123}

1 files changed, 34 insertions, 0 deletions

diff --git a/mojo/edk/system/awakable.h b/mojo/edk/system/awakable.h
new file mode 100644
index 0000000..2cb10f5
--- /dev/null
+++ b/mojo/edk/system/awakable.h
@@ -0,0 +1,34 @@
+// 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_AWAKABLE_H_
+#define MOJO_EDK_SYSTEM_AWAKABLE_H_
+
+#include <stdint.h>
+
+#include "mojo/edk/system/system_impl_export.h"
+#include "mojo/public/c/system/types.h"
+
+namespace mojo {
+namespace edk {
+
+// An interface that may be waited on |AwakableList|.
+class MOJO_SYSTEM_IMPL_EXPORT Awakable {
+ public:
+  // |Awake()| must satisfy the following contract:
+  // * As this is called from any thread, this must be thread-safe.
+  // * As this is called inside a lock, this must not call anything that takes
+  //   "non-terminal" locks, i.e., those which are always safe to take.
+  // This should return false if this must not be called again for the same
+  // reason (e.g., for the same call to |AwakableList::Add()|).
+  virtual bool Awake(MojoResult result, uintptr_t context) = 0;
+
+ protected:
+  Awakable() {}
+};
+
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_AWAKABLE_H_