EDK: wait sets: Implement WaitSetDispatcher::WaitSet{AddRemove}Impl().

mojo/edk/system/wait_set_dispatcher_unittest.cc

+// 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.
+
+#include "mojo/edk/system/wait_set_dispatcher.h"
+
+#include "mojo/edk/system/mock_simple_dispatcher.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using mojo::util::MakeRefCounted;
+
+namespace mojo {
+namespace system {
+namespace {
+
+TEST(WaitSetDispatcherTest, Basic) {
+  auto d = WaitSetDispatcher::Create(WaitSetDispatcher::kDefaultCreateOptions);
+
+  // These will be members of our wait set.
+  auto d_member0 = MakeRefCounted<test::MockSimpleDispatcher>(
+      MOJO_HANDLE_SIGNAL_NONE,
+      MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE);
+  auto d_member1 = MakeRefCounted<test::MockSimpleDispatcher>(
+      MOJO_HANDLE_SIGNAL_READABLE, MOJO_HANDLE_SIGNAL_READABLE);
+
+  // Add |d_member0|, for something not satisfied, but satisfiable.
+  const uint64_t kCookie0 = 0x123456789abcdef0ULL;
+  EXPECT_EQ(MOJO_RESULT_OK,
+            d->WaitSetAdd(NullUserPointer(), d_member0.Clone(),
+                          MOJO_HANDLE_SIGNAL_READABLE, kCookie0));
+
+  // Add |d_member1|, for something satisfied.
+  const uint64_t kCookie1 = 0x23456789abcdef01ULL;
+  EXPECT_EQ(MOJO_RESULT_OK,
+            d->WaitSetAdd(NullUserPointer(), d_member1.Clone(),
+                          MOJO_HANDLE_SIGNAL_READABLE, kCookie1));
+
+  // Can add |d_member0| again, with a different cookie.
+  const uint64_t kCookie2 = 0x3456789abcdef012ULL;
+  EXPECT_EQ(MOJO_RESULT_OK,
+            d->WaitSetAdd(NullUserPointer(), d_member0.Clone(),
+                          MOJO_HANDLE_SIGNAL_WRITABLE, kCookie2));
+
+  // Adding something with the same cookie yields "already exists".
+  EXPECT_EQ(MOJO_RESULT_ALREADY_EXISTS,
+            d->WaitSetAdd(NullUserPointer(), d_member1.Clone(),
+                          MOJO_HANDLE_SIGNAL_READABLE, kCookie2));
+
+  // Can remove something based on a cookie.
+  EXPECT_EQ(MOJO_RESULT_OK, d->WaitSetRemove(kCookie0));
+
+  // Trying to remove the same cookie again should fail.
+  EXPECT_EQ(MOJO_RESULT_NOT_FOUND, d->WaitSetRemove(kCookie0));
+
+  // Can re-add it.
+  EXPECT_EQ(MOJO_RESULT_OK,
+            d->WaitSetAdd(NullUserPointer(), d_member0.Clone(),
+                          MOJO_HANDLE_SIGNAL_READABLE, kCookie0));
+
+  // TODO(vtl): Test waiting here.
+
+  // Can close a dispatcher that's "in" the wait set.
+  EXPECT_EQ(MOJO_RESULT_OK, d_member1->Close());
+
+  // TODO(vtl): Test waiting here.
+
+  // Can remove something whose dispatcher has been closed.
+  EXPECT_EQ(MOJO_RESULT_OK, d->WaitSetRemove(kCookie1));
+
+  // Can close the wait set when it's not empty.
+  EXPECT_EQ(MOJO_RESULT_OK, d->Close());
+
+  EXPECT_EQ(MOJO_RESULT_OK, d_member0->Close());
+}
+
+// TODO(vtl): Test options validation for "create" and "add" (not that there's
+// much to test).
+
+}  // namespace
+}  // namespace system
+}  // namespace mojo