Initial in-process implementation of some Mojo primitives.

mojo/system/waiter_test_utils.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_SYSTEM_WAITER_TEST_UTILS_H_
+#define MOJO_SYSTEM_WAITER_TEST_UTILS_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/simple_thread.h"
+#include "mojo/public/system/core.h"
+#include "mojo/system/dispatcher.h"
+#include "mojo/system/waiter.h"
+
+namespace mojo {
+namespace system {
+namespace test {
+
+// This is a very simple thread that has a |Waiter|, on which it waits
+// indefinitely (and records the result). It will create and initialize the
+// |Waiter| on creation, but the caller must start the thread with |Start()|. It
+// will join the thread on destruction.
+//
+// One usually uses it like:
+//
+//    MojoResult result;
+//    {
+//      WaiterList waiter_list;
+//      test::SimpleWaiterThread thread(&result);
+//      waiter_list.AddWaiter(thread.waiter(), ...);
+//      thread.Start();
+//      ... some stuff to wake the waiter ...
+//      waiter_list.RemoveWaiter(thread.waiter());
+//    }  // Join |thread|.
+//    EXPECT_EQ(..., result);
+//
+// There's a bit of unrealism in its use: In this sort of usage, calls such as
+// |Waiter::Init()|, |AddWaiter()|, and |RemoveWaiter()| are done in the main
+// (test) thread, not the waiter thread (as would actually happen in real code).
+// (We accept this unrealism for simplicity, since |WaiterList| is
+// thread-unsafe so making it more realistic would require adding nontrivial
+// synchronization machinery.)
+class SimpleWaiterThread : public base::SimpleThread {
+ public:
+  // For the duration of the lifetime of this object, |*result| belongs to it
+  // (in the sense that it will write to it whenever it wants).
+  explicit SimpleWaiterThread(MojoResult* result);
+  virtual ~SimpleWaiterThread();  // Joins the thread.
+
+  Waiter* waiter() { return &waiter_; }
+
+ private:
+  virtual void Run() OVERRIDE;
+
+  MojoResult* const result_;
+  Waiter waiter_;
+
+  DISALLOW_COPY_AND_ASSIGN(SimpleWaiterThread);
+};
+
+// This is a more complex and realistic thread that has a |Waiter|, on which it
+// waits for the given deadline (with the given flags). Unlike
+// |SimpleWaiterThread|, it requires the machinery of |Dispatcher|.
+class WaiterThread : public base::SimpleThread {
+ public:
+  // Note: |*did_wait_out| and |*result| belong to this object while it's alive.
+  WaiterThread(scoped_refptr<Dispatcher> dispatcher,
+               MojoWaitFlags wait_flags,
+               MojoDeadline deadline,
+               MojoResult success_result,
+               bool* did_wait_out,
+               MojoResult* result_out);
+  virtual ~WaiterThread();
+
+ private:
+  virtual void Run() OVERRIDE;
+
+  const scoped_refptr<Dispatcher> dispatcher_;
+  const MojoWaitFlags wait_flags_;
+  const MojoDeadline deadline_;
+  const MojoResult success_result_;
+  bool* const did_wait_out_;
+  MojoResult* const result_out_;
+
+  Waiter waiter_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaiterThread);
+};
+
+}  // namespace test
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_WAITER_TEST_UTILS_H_