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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// 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 "starboard/configuration.h"
#include "starboard/mutex.h"
#include "starboard/thread.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace starboard {
namespace nplb {
namespace {
struct TestContext {
TestContext() : count(0) {}
SbMutex mutex;
int count;
};
const int kLoops = 10000;
void* EntryPoint(void* parameter) {
TestContext* context = static_cast<TestContext*>(parameter);
for (int i = 0; i < kLoops; ++i) {
SbMutexAcquire(&context->mutex);
int k = context->count;
k = k + 1;
context->count = k;
SbMutexRelease(&context->mutex);
}
return NULL;
}
// This test just tries to acquire a mutex repeatedly while other threads are
// doing the same.
TEST(SbMutexAcquireTest, SunnyDayContended) {
TestContext context;
EXPECT_TRUE(SbMutexCreate(&context.mutex));
const int kThreads = 4;
SbThread threads[kThreads];
for (int i = 0; i < kThreads; ++i) {
threads[i] = SbThreadCreate(0, kSbThreadNoPriority, kSbThreadNoAffinity,
true, NULL, EntryPoint, &context);
}
for (int i = 0; i < kLoops; ++i) {
for (int j = 0; j < kThreads; ++j) {
EXPECT_TRUE(SbMutexIsSuccess(SbMutexAcquire(&context.mutex)));
int k = context.count;
k = k - 1;
context.count = k;
EXPECT_TRUE(SbMutexRelease(&context.mutex));
}
}
// Join other threads and clean up.
for (int i = 0; i < kThreads; ++i) {
EXPECT_TRUE(SbThreadJoin(threads[i], NULL));
}
EXPECT_TRUE(SbMutexDestroy(&context.mutex));
EXPECT_EQ(0, context.count);
}
TEST(SbMutexAcquireTest, SunnyDayUncontended) {
SbMutex mutex;
EXPECT_TRUE(SbMutexCreate(&mutex));
SbMutexResult result = SbMutexAcquire(&mutex);
EXPECT_EQ(kSbMutexAcquired, result);
EXPECT_TRUE(SbMutexIsSuccess(result));
EXPECT_TRUE(SbMutexRelease(&mutex));
EXPECT_TRUE(SbMutexDestroy(&mutex));
}
TEST(SbMutexAcquireTest, SunnyDayStaticallyInitialized) {
SbMutex mutex = SB_MUTEX_INITIALIZER;
EXPECT_TRUE(SbMutexIsSuccess(SbMutexAcquire(&mutex)));
EXPECT_TRUE(SbMutexRelease(&mutex));
EXPECT_TRUE(SbMutexDestroy(&mutex));
}
} // namespace
} // namespace nplb
} // namespace starboard