sdk/lib/async/test/default_tests.cc

// Copyright 2017 The Fuchsia 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 <lib/async-testing/dispatcher_stub.h>
#include <lib/async/default.h>
#include <threads.h>

#include <gtest/gtest.h>

namespace {

int default_test_thread(void*) {
  EXPECT_EQ(nullptr, async_get_default_dispatcher()) << "other thread's default is initially null";

  async::DispatcherStub async;
  async_set_default_dispatcher(&async);
  EXPECT_EQ(&async, async_get_default_dispatcher()) << "other thread's default can be changed";
  return 1;
}

TEST(DefaultTests, get_set_default_test) {
  // Default is initially null.
  EXPECT_EQ(nullptr, async_get_default_dispatcher()) << "default is initially null";

  // Default can be changed.
  async::DispatcherStub async;
  async_set_default_dispatcher(&async);
  EXPECT_EQ(&async, async_get_default_dispatcher()) << "default can be changed";

  // Default is thread-local.
  thrd_t thread;
  ASSERT_EQ(thrd_success, thrd_create(&thread, default_test_thread, nullptr)) << "thrd_create";
  int result;
  ASSERT_EQ(thrd_success, thrd_join(thread, &result)) << "thrd_join";
  EXPECT_EQ(1, result) << "other thread has its own default";
  EXPECT_EQ(&async, async_get_default_dispatcher()) << "this thread's default is unchanged";

  async_set_default_dispatcher(nullptr);
}

}  // namespace