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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/audio_device/android/low_latency_event.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/system_wrappers/interface/scoped_ptr.h"
#include "webrtc/system_wrappers/interface/sleep.h"
#include "webrtc/system_wrappers/interface/thread_wrapper.h"
namespace webrtc {
static const int kEventMsg = 1;
class LowLatencyEventTest : public testing::Test {
public:
LowLatencyEventTest()
: process_thread_(ThreadWrapper::CreateThread(CbThread,
this,
kRealtimePriority,
"test_thread")),
terminated_(false),
iteration_count_(0),
allowed_iterations_(0) {
EXPECT_TRUE(event_.Start());
Start();
}
~LowLatencyEventTest() {
EXPECT_GE(allowed_iterations_, 1);
EXPECT_GE(iteration_count_, 1);
Stop();
}
void AllowOneIteration() {
++allowed_iterations_;
event_.SignalEvent(allowed_iterations_, kEventMsg);
}
private:
void Start() {
unsigned int thread_id = 0;
EXPECT_TRUE(process_thread_->Start(thread_id));
}
void Stop() {
terminated_ = true;
event_.Stop();
process_thread_->Stop();
}
static bool CbThread(void* context) {
return reinterpret_cast<LowLatencyEventTest*>(context)->CbThreadImpl();
}
bool CbThreadImpl() {
int allowed_iterations;
int message;
++iteration_count_;
event_.WaitOnEvent(&allowed_iterations, &message);
EXPECT_EQ(iteration_count_, allowed_iterations);
EXPECT_EQ(message, kEventMsg);
return !terminated_;
}
LowLatencyEvent event_;
scoped_ptr<ThreadWrapper> process_thread_;
bool terminated_;
int iteration_count_;
int allowed_iterations_;
};
TEST_F(LowLatencyEventTest, TriggerEvent) {
for (int i = 0; i < 3; ++i) {
AllowOneIteration();
}
}
// Events trigger in less than 3ms. Wait for 3 ms to ensure there are no
// spurious wakeups.
TEST_F(LowLatencyEventTest, NoTriggerEvent) {
SleepMs(3);
// If there were spurious wakeups either the wakeups would have triggered a
// failure as we haven't allowed an iteration yet. Or the wakeup happened
// to signal 0, 0 in which case the mismatch will be discovered when allowing
// an iteration to happen.
AllowOneIteration();
}
} // namespace webrtc
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