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115 lines
3.9 KiB
115 lines
3.9 KiB
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include <chrono>
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#include "gtest/gtest.h"
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#include "pw_chrono/system_clock.h"
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#include "pw_preprocessor/util.h"
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using namespace std::chrono_literals;
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namespace pw::chrono {
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namespace {
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extern "C" {
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// Functions defined in system_clock_facade_test_c.c which call the API from C.
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pw_chrono_SystemClock_TimePoint pw_chrono_SystemClock_CallNow();
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pw_chrono_SystemClock_Duration pw_chrono_SystemClock_CallTimeElapsed(
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pw_chrono_SystemClock_TimePoint last_time,
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pw_chrono_SystemClock_TimePoint current_time);
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pw_chrono_SystemClock_Nanoseconds pw_chrono_SystemClock_CallDurationToNsFloor(
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pw_chrono_SystemClock_Duration ticks);
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} // extern "C"
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// While testing that the clock ticks (i.e. moves forward) we want to ensure a
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// failure can be reported instead of deadlocking the test until it passes.
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// Given that there isn't really a good heuristic for this we instead make some
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// wild assumptions to bound the maximum busy loop iterations.
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// - Assume our clock is < 6Ghz
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// - Assume we can check the clock in a single cycle
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// - Wait for up to 1/10th of a second @ 6Ghz, this may be a long period on a
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// slower (i.e. real) machine.
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constexpr uint64_t kMaxIterations = 6'000'000'000 / 10;
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TEST(SystemClock, Now) {
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const SystemClock::time_point start_time = SystemClock::now();
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// Verify the clock moves forward.
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bool clock_moved_forward = false;
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for (uint64_t i = 0; i < kMaxIterations; ++i) {
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if (SystemClock::now() > start_time) {
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clock_moved_forward = true;
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break;
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}
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}
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EXPECT_TRUE(clock_moved_forward);
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}
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TEST(VirtualSystemClock, Now) {
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auto& clock = VirtualSystemClock::RealClock();
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const SystemClock::time_point start_time = clock.now();
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// Verify the clock moves forward.
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bool clock_moved_forward = false;
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for (uint64_t i = 0; i < kMaxIterations; ++i) {
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if (clock.now() > start_time) {
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clock_moved_forward = true;
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break;
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}
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}
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EXPECT_TRUE(clock_moved_forward);
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}
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TEST(SystemClock, NowInC) {
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const pw_chrono_SystemClock_TimePoint start_time =
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pw_chrono_SystemClock_CallNow();
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// Verify the clock moves forward.
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bool clock_moved_forward = false;
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for (uint64_t i = 0; i < kMaxIterations; ++i) {
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if (pw_chrono_SystemClock_CallNow().duration_since_epoch.ticks >
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start_time.duration_since_epoch.ticks) {
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clock_moved_forward = true;
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break;
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}
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}
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EXPECT_TRUE(clock_moved_forward);
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}
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TEST(SystemClock, TimeElapsedInC) {
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const pw_chrono_SystemClock_TimePoint first = pw_chrono_SystemClock_CallNow();
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const pw_chrono_SystemClock_TimePoint last = pw_chrono_SystemClock_CallNow();
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static_assert(SystemClock::is_monotonic);
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EXPECT_GE(0, pw_chrono_SystemClock_CallTimeElapsed(last, first).ticks);
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}
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TEST(SystemClock, DurationCastInC) {
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// We can't control the SystemClock's period configuration, so just in case
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// 42 hours cannot be accurately expressed in integer ticks, round the
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// duration w/ floor.
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static constexpr auto kRoundedArbitraryDuration =
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std::chrono::floor<SystemClock::duration>(42h);
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static constexpr pw_chrono_SystemClock_Duration kRoundedArbitraryDurationInC =
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PW_SYSTEM_CLOCK_H_FLOOR(42);
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EXPECT_EQ(
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std::chrono::floor<std::chrono::nanoseconds>(kRoundedArbitraryDuration)
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.count(),
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pw_chrono_SystemClock_CallDurationToNsFloor(
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kRoundedArbitraryDurationInC));
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}
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} // namespace
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} // namespace pw::chrono
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