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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/synchronization/waitable_event.h"
#include <stddef.h>
#include "base/compiler_specific.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
TEST(WaitableEventTest, ManualBasics) {
WaitableEvent event(WaitableEvent::ResetPolicy::MANUAL,
WaitableEvent::InitialState::NOT_SIGNALED);
EXPECT_FALSE(event.IsSignaled());
event.Signal();
EXPECT_TRUE(event.IsSignaled());
EXPECT_TRUE(event.IsSignaled());
event.Reset();
EXPECT_FALSE(event.IsSignaled());
EXPECT_FALSE(event.TimedWait(TimeDelta::FromMilliseconds(10)));
event.Signal();
event.Wait();
EXPECT_TRUE(event.TimedWait(TimeDelta::FromMilliseconds(10)));
}
TEST(WaitableEventTest, AutoBasics) {
WaitableEvent event(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
EXPECT_FALSE(event.IsSignaled());
event.Signal();
EXPECT_TRUE(event.IsSignaled());
EXPECT_FALSE(event.IsSignaled());
event.Reset();
EXPECT_FALSE(event.IsSignaled());
EXPECT_FALSE(event.TimedWait(TimeDelta::FromMilliseconds(10)));
event.Signal();
event.Wait();
EXPECT_FALSE(event.TimedWait(TimeDelta::FromMilliseconds(10)));
event.Signal();
EXPECT_TRUE(event.TimedWait(TimeDelta::FromMilliseconds(10)));
}
TEST(WaitableEventTest, WaitManyShortcut) {
WaitableEvent* ev[5];
for (unsigned i = 0; i < 5; ++i) {
ev[i] = new WaitableEvent(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
}
ev[3]->Signal();
EXPECT_EQ(WaitableEvent::WaitMany(ev, 5), 3u);
ev[3]->Signal();
EXPECT_EQ(WaitableEvent::WaitMany(ev, 5), 3u);
ev[4]->Signal();
EXPECT_EQ(WaitableEvent::WaitMany(ev, 5), 4u);
ev[0]->Signal();
EXPECT_EQ(WaitableEvent::WaitMany(ev, 5), 0u);
for (unsigned i = 0; i < 5; ++i)
delete ev[i];
}
class WaitableEventSignaler : public PlatformThread::Delegate {
public:
WaitableEventSignaler(TimeDelta delay, WaitableEvent* event)
: delay_(delay),
event_(event) {
}
void ThreadMain() override {
PlatformThread::Sleep(delay_);
event_->Signal();
}
private:
const TimeDelta delay_;
WaitableEvent* event_;
};
// Tests that a WaitableEvent can be safely deleted when |Wait| is done without
// additional synchronization.
TEST(WaitableEventTest, WaitAndDelete) {
WaitableEvent* ev =
new WaitableEvent(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
WaitableEventSignaler signaler(TimeDelta::FromMilliseconds(10), ev);
PlatformThreadHandle thread;
PlatformThread::Create(0, &signaler, &thread);
ev->Wait();
delete ev;
PlatformThread::Join(thread);
}
// Tests that a WaitableEvent can be safely deleted when |WaitMany| is done
// without additional synchronization.
TEST(WaitableEventTest, WaitMany) {
WaitableEvent* ev[5];
for (unsigned i = 0; i < 5; ++i) {
ev[i] = new WaitableEvent(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
}
WaitableEventSignaler signaler(TimeDelta::FromMilliseconds(10), ev[2]);
PlatformThreadHandle thread;
PlatformThread::Create(0, &signaler, &thread);
size_t index = WaitableEvent::WaitMany(ev, 5);
for (unsigned i = 0; i < 5; ++i)
delete ev[i];
PlatformThread::Join(thread);
EXPECT_EQ(2u, index);
}
// Tests that using TimeDelta::Max() on TimedWait() is not the same as passing
// a timeout of 0. (crbug.com/465948)
TEST(WaitableEventTest, TimedWait) {
WaitableEvent* ev =
new WaitableEvent(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
TimeDelta thread_delay = TimeDelta::FromMilliseconds(10);
WaitableEventSignaler signaler(thread_delay, ev);
PlatformThreadHandle thread;
TimeTicks start = TimeTicks::Now();
PlatformThread::Create(0, &signaler, &thread);
EXPECT_TRUE(ev->TimedWait(TimeDelta::Max()));
EXPECT_GE(TimeTicks::Now() - start, thread_delay);
delete ev;
PlatformThread::Join(thread);
}
// Tests that a sub-ms TimedWait doesn't time out promptly.
TEST(WaitableEventTest, SubMsTimedWait) {
WaitableEvent ev(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
TimeDelta delay = TimeDelta::FromMicroseconds(900);
TimeTicks start_time = TimeTicks::Now();
ev.TimedWait(delay);
EXPECT_GE(TimeTicks::Now() - start_time, delay);
}
// Tests that TimedWaitUntil can be safely used with various end_time deadline
// values.
TEST(WaitableEventTest, TimedWaitUntil) {
WaitableEvent ev(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
TimeTicks start_time(TimeTicks::Now());
TimeDelta delay = TimeDelta::FromMilliseconds(10);
// Should be OK to wait for the current time or time in the past.
// That should end promptly and be equivalent to IsSignalled.
EXPECT_FALSE(ev.TimedWaitUntil(start_time));
EXPECT_FALSE(ev.TimedWaitUntil(start_time - delay));
// Should be OK to wait for zero TimeTicks().
EXPECT_FALSE(ev.TimedWaitUntil(TimeTicks()));
// Waiting for a time in the future shouldn't end before the deadline
// if the event isn't signalled.
EXPECT_FALSE(ev.TimedWaitUntil(start_time + delay));
EXPECT_GE(TimeTicks::Now() - start_time, delay);
// Test that passing TimeTicks::Max to TimedWaitUntil is valid and isn't
// the same as passing TimeTicks(). Also verifies that signaling event
// ends the wait promptly.
WaitableEventSignaler signaler(delay, &ev);
PlatformThreadHandle thread;
start_time = TimeTicks::Now();
PlatformThread::Create(0, &signaler, &thread);
EXPECT_TRUE(ev.TimedWaitUntil(TimeTicks::Max()));
EXPECT_GE(TimeTicks::Now() - start_time, delay);
PlatformThread::Join(thread);
}
} // namespace base
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