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authorGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
committerGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
commitc2e754829628d1e9b7a16b3389cfdace76950fdf (patch)
tree5a7f056f44e27c30e10025113b644f0b3b5801fc /absl/time/clock_test.cc
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+// Copyright 2017 The Abseil 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
+//
+// 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.
+
+#include "absl/time/clock.h"
+
+#include "absl/base/config.h"
+#if defined(ABSL_HAVE_ALARM)
+#include <signal.h>
+#include <unistd.h>
+#elif defined(__linux__) || defined(__APPLE__)
+#error all known Linux and Apple targets have alarm
+#endif
+
+#include "gtest/gtest.h"
+#include "absl/time/time.h"
+
+namespace {
+
+TEST(Time, Now) {
+ const absl::Time before = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+ const absl::Time now = absl::Now();
+ const absl::Time after = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+ EXPECT_GE(now, before);
+ EXPECT_GE(after, now);
+}
+
+TEST(SleepForTest, BasicSanity) {
+ absl::Duration sleep_time = absl::Milliseconds(2500);
+ absl::Time start = absl::Now();
+ absl::SleepFor(sleep_time);
+ absl::Time end = absl::Now();
+ EXPECT_LE(sleep_time - absl::Milliseconds(100), end - start);
+ EXPECT_GE(sleep_time + absl::Milliseconds(100), end - start);
+}
+
+#ifdef ABSL_HAVE_ALARM
+// Helper for test SleepFor.
+bool alarm_handler_invoked = false;
+void AlarmHandler(int signo) {
+ ASSERT_EQ(signo, SIGALRM);
+ alarm_handler_invoked = true;
+}
+
+TEST(SleepForTest, AlarmSupport) {
+ alarm_handler_invoked = false;
+ sig_t old_alarm = signal(SIGALRM, AlarmHandler);
+ alarm(2);
+ absl::Duration sleep_time = absl::Milliseconds(3500);
+ absl::Time start = absl::Now();
+ absl::SleepFor(sleep_time);
+ absl::Time end = absl::Now();
+ EXPECT_TRUE(alarm_handler_invoked);
+ EXPECT_LE(sleep_time - absl::Milliseconds(100), end - start);
+ EXPECT_GE(sleep_time + absl::Milliseconds(100), end - start);
+ signal(SIGALRM, old_alarm);
+}
+#endif // ABSL_HAVE_ALARM
+
+} // namespace