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// Copyright (C) 2014 The Android Open Source Project
//
// 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 "emugl/common/mutex.h"
#include "emugl/common/testing/test_thread.h"
#include <gtest/gtest.h>
namespace emugl {
// Check that construction and destruction doesn't crash.
TEST(Mutex, ConstructionDestruction) {
Mutex lock;
}
// Check that a simple lock + unlock works.
TEST(Mutex, LockUnlock) {
Mutex lock;
lock.lock();
lock.unlock();
}
// Check that AutoLock compiles and doesn't crash.
TEST(Mutex, AutoLock) {
Mutex mutex;
Mutex::AutoLock lock(mutex);
}
// Wrapper class for threads. Does not use emugl::Thread intentionally.
// Common data type used by the following tests below.
struct ThreadParams {
ThreadParams() : mutex(), counter(0) {}
Mutex mutex;
int counter;
};
// This thread function uses Mutex::lock/unlock to synchronize a counter
// increment operation.
static void* threadFunction(void* param) {
ThreadParams* p = static_cast<ThreadParams*>(param);
p->mutex.lock();
p->counter++;
p->mutex.unlock();
return NULL;
}
TEST(Mutex, Synchronization) {
const size_t kNumThreads = 2000;
TestThread* threads[kNumThreads];
ThreadParams p;
// Create and launch all threads.
for (size_t n = 0; n < kNumThreads; ++n) {
threads[n] = new TestThread(threadFunction, &p);
}
// Wait until their completion.
for (size_t n = 0; n < kNumThreads; ++n) {
threads[n]->join();
delete threads[n];
}
EXPECT_EQ(static_cast<int>(kNumThreads), p.counter);
}
// This thread function uses a Mutex::AutoLock to protect the counter.
static void* threadAutoLockFunction(void* param) {
ThreadParams* p = static_cast<ThreadParams*>(param);
Mutex::AutoLock lock(p->mutex);
p->counter++;
return NULL;
}
TEST(Mutex, AutoLockSynchronization) {
const size_t kNumThreads = 2000;
TestThread* threads[kNumThreads];
ThreadParams p;
// Create and launch all threads.
for (size_t n = 0; n < kNumThreads; ++n) {
threads[n] = new TestThread(threadAutoLockFunction, &p);
}
// Wait until their completion.
for (size_t n = 0; n < kNumThreads; ++n) {
threads[n]->join();
delete threads[n];
}
EXPECT_EQ(static_cast<int>(kNumThreads), p.counter);
}
} // namespace emugl
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