1 files changed, 74 insertions, 0 deletions
diff --git a/test/util/timer_util.h b/test/util/timer_util.h
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+++ b/test/util/timer_util.h
@@ -0,0 +1,74 @@
+// Copyright 2018 Google LLC
+//
+// 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
+//
+//     http://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.
+
+#ifndef GVISOR_TEST_UTIL_TIMER_UTIL_H_
+#define GVISOR_TEST_UTIL_TIMER_UTIL_H_
+
+#include <errno.h>
+#include <sys/time.h>
+
+#include <functional>
+
+#include "gmock/gmock.h"
+#include "absl/time/time.h"
+#include "test/util/cleanup.h"
+#include "test/util/logging.h"
+#include "test/util/posix_error.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+// MonotonicTimer is a simple timer that uses a monotic clock.
+class MonotonicTimer {
+ public:
+  MonotonicTimer() {}
+  absl::Duration Duration() {
+    struct timespec ts;
+    TEST_CHECK(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
+    return absl::TimeFromTimespec(ts) - start_;
+  }
+
+  void Start() {
+    struct timespec ts;
+    TEST_CHECK(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
+    start_ = absl::TimeFromTimespec(ts);
+  }
+
+ protected:
+  absl::Time start_;
+};
+
+// Sets the given itimer and returns a cleanup function that restores the
+// previous itimer when it goes out of scope.
+inline PosixErrorOr<Cleanup> ScopedItimer(int which,
+                                          struct itimerval const& new_value) {
+  struct itimerval old_value;
+  int rc = setitimer(which, &new_value, &old_value);
+  MaybeSave();
+  if (rc < 0) {
+    return PosixError(errno, "setitimer failed");
+  }
+  return Cleanup(std::function<void(void)>([which, old_value] {
+    EXPECT_THAT(setitimer(which, &old_value, nullptr), SyscallSucceeds());
+  }));
+}
+
+// Returns the current time.
+absl::Time Now(clockid_t id);
+
+}  // namespace testing
+}  // namespace gvisor
+
+#endif  // GVISOR_TEST_UTIL_TIMER_UTIL_H_