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// Copyright 2020 The Pigweed 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
//
// https://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 <chrono>
#include "gtest/gtest.h"
#include "pw_chrono/system_clock.h"
#include "pw_sync/timed_thread_notification.h"
using pw::chrono::SystemClock;
using namespace std::chrono_literals;
namespace pw::sync {
namespace {
// We can't control the SystemClock's period configuration, so just in case
// duration cannot be accurately expressed in integer ticks, round the
// duration up.
constexpr SystemClock::duration kRoundedArbitraryDuration =
SystemClock::for_at_least(42ms);
TEST(TimedThreadNotification, EmptyInitialState) {
TimedThreadNotification notification;
EXPECT_FALSE(notification.try_acquire());
}
// TODO(b/235284163): Add real concurrency tests.
TEST(TimedThreadNotification, Release) {
TimedThreadNotification notification;
notification.release();
notification.release();
notification.acquire();
// Ensure it fails when not notified.
EXPECT_FALSE(notification.try_acquire());
}
TimedThreadNotification empty_initial_notification;
TEST(TimedThreadNotification, EmptyInitialStateStatic) {
EXPECT_FALSE(empty_initial_notification.try_acquire());
}
TimedThreadNotification raise_notification;
TEST(TimedThreadNotification, ReleaseStatic) {
raise_notification.release();
raise_notification.release();
raise_notification.acquire();
// Ensure it fails when not notified.
EXPECT_FALSE(raise_notification.try_acquire());
}
TEST(TimedThreadNotification, TryAcquireForNotified) {
TimedThreadNotification notification;
notification.release();
// Ensure it doesn't block and succeeds when notified.
SystemClock::time_point before = SystemClock::now();
EXPECT_TRUE(notification.try_acquire_for(kRoundedArbitraryDuration));
SystemClock::duration time_elapsed = SystemClock::now() - before;
EXPECT_LT(time_elapsed, kRoundedArbitraryDuration);
}
TEST(TimedThreadNotification, TryAcquireForNotNotifiedPositiveTimeout) {
TimedThreadNotification notification;
// Ensure it blocks and fails when not notified for the full timeout.
SystemClock::time_point before = SystemClock::now();
EXPECT_FALSE(notification.try_acquire_for(kRoundedArbitraryDuration));
SystemClock::duration time_elapsed = SystemClock::now() - before;
EXPECT_GE(time_elapsed, kRoundedArbitraryDuration);
}
TEST(TimedThreadNotification, TryAcquireForNotNotifiedZeroLengthTimeout) {
TimedThreadNotification notification;
// Ensure it doesn't block when a zero length duration is used.
SystemClock::time_point before = SystemClock::now();
EXPECT_FALSE(notification.try_acquire_for(SystemClock::duration::zero()));
SystemClock::duration time_elapsed = SystemClock::now() - before;
EXPECT_LT(time_elapsed, kRoundedArbitraryDuration);
}
TEST(TimedThreadNotification, TryAcquireForNotNotifiedNegativeTimeout) {
TimedThreadNotification notification;
// Ensure it doesn't block when a negative duration is used.
SystemClock::time_point before = SystemClock::now();
EXPECT_FALSE(notification.try_acquire_for(-kRoundedArbitraryDuration));
SystemClock::duration time_elapsed = SystemClock::now() - before;
EXPECT_LT(time_elapsed, kRoundedArbitraryDuration);
}
TEST(TimedThreadNotification, TryAcquireUntilNotified) {
TimedThreadNotification notification;
notification.release();
// Ensure it doesn't block and succeeds when notified.
SystemClock::time_point deadline =
SystemClock::now() + kRoundedArbitraryDuration;
EXPECT_TRUE(notification.try_acquire_until(deadline));
EXPECT_LT(SystemClock::now(), deadline);
}
TEST(TimedThreadNotification, TryAcquireUntilNotNotifiedFutureDeadline) {
TimedThreadNotification notification;
// Ensure it blocks and fails when not notified.
SystemClock::time_point deadline =
SystemClock::now() + kRoundedArbitraryDuration;
EXPECT_FALSE(notification.try_acquire_until(deadline));
EXPECT_GE(SystemClock::now(), deadline);
}
TEST(TimedThreadNotification, TryAcquireUntilNotNotifiedCurrentDeadline) {
TimedThreadNotification notification;
// Ensure it doesn't block when now is used.
SystemClock::time_point deadline =
SystemClock::now() + kRoundedArbitraryDuration;
EXPECT_FALSE(notification.try_acquire_until(SystemClock::now()));
EXPECT_LT(SystemClock::now(), deadline);
}
TEST(TimedThreadNotification, TryAcquireUntilNotNotifiedPastDeadline) {
TimedThreadNotification notification;
// Ensure it doesn't block when a timestamp in the past is used.
SystemClock::time_point deadline =
SystemClock::now() + kRoundedArbitraryDuration;
EXPECT_FALSE(notification.try_acquire_until(SystemClock::now() -
kRoundedArbitraryDuration));
EXPECT_LT(SystemClock::now(), deadline);
}
} // namespace
} // namespace pw::sync