Function foreach

src/tests/container_logger_tests.cpp:306–325

  Try<os::ProcessTree> pstrees = os::pstree(0);
  ASSERT_SOME(pstrees);
  foreach (const os::ProcessTree& pstree, pstrees->children) {
    // Wait for the logger subprocesses to exit, for up to 5 seconds each.
    Duration waited = Duration::zero();
    do {
      if (!os::exists(pstree.process.pid)) {
        break;
      }

      // Push the clock ahead to speed up the reaping of subprocesses.
      Clock::pause();
      Clock::settle();
      Clock::advance(Seconds(1));
      Clock::resume();

      os::sleep(Milliseconds(100));
      waited += Milliseconds(100);
    } while (waited < Seconds(5));

    EXPECT_LE(waited, Seconds(5));
  }

  // Check for the expected log rotation.
  string sandboxDirectory = path::join(