third_party/marl/src/osfiber_test.cpp

// Copyright 2019 The Marl Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "osfiber.h"

#include "marl_test.h"

TEST(WithoutBoundScheduler, OSFiber) {
  std::string str;
  auto constexpr fiberStackSize = 8 * 1024;
  auto main = std::unique_ptr<marl::OSFiber>(
      marl::OSFiber::createFiberFromCurrentThread());
  std::unique_ptr<marl::OSFiber> fiberA, fiberB, fiberC;
  fiberC = std::unique_ptr<marl::OSFiber>(
      marl::OSFiber::createFiber(fiberStackSize, [&] {
        str += "C";
        fiberC->switchTo(fiberB.get());
      }));
  fiberB = std::unique_ptr<marl::OSFiber>(
      marl::OSFiber::createFiber(fiberStackSize, [&] {
        str += "B";
        fiberB->switchTo(fiberA.get());
      }));
  fiberA = std::unique_ptr<marl::OSFiber>(
      marl::OSFiber::createFiber(fiberStackSize, [&] {
        str += "A";
        fiberA->switchTo(main.get());
      }));

  main->switchTo(fiberC.get());

  ASSERT_EQ(str, "CBA");
}