src/tests/containerizer/sched_tests.cpp

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//     http://www.apache.org/licenses/LICENSE-2.0
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#include <gtest/gtest.h>

#include "linux/sched.hpp"

#include <process/gtest.hpp>
#include <process/reap.hpp>

#include <stout/gtest.hpp>

using sched::Policy;

namespace mesos {
namespace internal {
namespace tests {

// TODO(idownes): Test the priority and preemption behavior for
// running competing SCHED_OTHER and SCHED_IDLE tasks.

TEST(SchedTest, ROOT_PolicySelf)
{
  Try<Policy> original = sched::policy::get();
  ASSERT_SOME(original);

  Policy different = (original.get() == Policy::OTHER ? Policy::IDLE
                                                      : Policy::OTHER);

  // Change our own scheduling policy.
  EXPECT_SOME(sched::policy::set(different));
  EXPECT_SOME_EQ(different, sched::policy::get());

  // Change it back.
  EXPECT_SOME(sched::policy::set(original.get()));
  EXPECT_SOME_EQ(original.get(), sched::policy::get());
}


// Change the scheduling policy of a different process (our child).
TEST(SchedTest, ROOT_PolicyChild)
{
  Try<Policy> original = sched::policy::get();
  ASSERT_SOME(original);

  Policy different = (original.get() == Policy::OTHER ? Policy::IDLE
                                                      : Policy::OTHER);

  pid_t pid = ::fork();
  ASSERT_NE(-1, pid);

  if (pid == 0) {
    // Child.
    sleep(10);

    ABORT("Child process should not reach here");
  }

  // Continue in parent.
  // Check the child has inherited our policy.
  EXPECT_SOME_EQ(original.get(), sched::policy::get(pid));

  // Check we can change the child's policy.
  EXPECT_SOME(sched::policy::set(different, pid));
  EXPECT_SOME_EQ(different, sched::policy::get(pid));

  // Kill the child process.
  ASSERT_NE(-1, ::kill(pid, SIGKILL));

  // Wait for the child process.
  AWAIT_EXPECT_WTERMSIG_EQ(SIGKILL, process::reap(pid));
}

} // namespace tests {
} // namespace internal {
} // namespace mesos {