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/*
* Copyright 2011 Google Inc. 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 <stdlib.h>
#include "gtest/gtest.h"
#include "sfntly/port/lock.h"
#include "test/platform_thread.h"
namespace sfntly {
// Basic test to make sure that Acquire()/Unlock()/Try() don't crash
class BasicLockTestThread : public PlatformThread::Delegate {
public:
BasicLockTestThread(Lock* lock) : lock_(lock), acquired_(0) {}
virtual void ThreadMain() {
for (int i = 0; i < 10; i++) {
lock_->Acquire();
acquired_++;
lock_->Unlock();
}
for (int i = 0; i < 10; i++) {
lock_->Acquire();
acquired_++;
PlatformThread::Sleep(rand() % 20);
lock_->Unlock();
}
for (int i = 0; i < 10; i++) {
if (lock_->Try()) {
acquired_++;
PlatformThread::Sleep(rand() % 20);
lock_->Unlock();
}
}
}
int acquired() const { return acquired_; }
private:
Lock* lock_;
int acquired_;
NO_COPY_AND_ASSIGN(BasicLockTestThread);
};
bool BasicLockTest() {
Lock lock;
BasicLockTestThread thread(&lock);
PlatformThreadHandle handle = kNullThreadHandle;
EXPECT_TRUE(PlatformThread::Create(&thread, &handle));
int acquired = 0;
for (int i = 0; i < 5; i++) {
lock.Acquire();
acquired++;
lock.Unlock();
}
for (int i = 0; i < 10; i++) {
lock.Acquire();
acquired++;
PlatformThread::Sleep(rand() % 20);
lock.Unlock();
}
for (int i = 0; i < 10; i++) {
if (lock.Try()) {
acquired++;
PlatformThread::Sleep(rand() % 20);
lock.Unlock();
}
}
for (int i = 0; i < 5; i++) {
lock.Acquire();
acquired++;
PlatformThread::Sleep(rand() % 20);
lock.Unlock();
}
PlatformThread::Join(handle);
EXPECT_GE(acquired, 20);
EXPECT_GE(thread.acquired(), 20);
return true;
}
// Test that Try() works as expected -------------------------------------------
class TryLockTestThread : public PlatformThread::Delegate {
public:
TryLockTestThread(Lock* lock) : lock_(lock), got_lock_(false) {}
virtual void ThreadMain() {
got_lock_ = lock_->Try();
if (got_lock_)
lock_->Unlock();
}
bool got_lock() const { return got_lock_; }
private:
Lock* lock_;
bool got_lock_;
NO_COPY_AND_ASSIGN(TryLockTestThread);
};
bool TryLockTest() {
Lock lock;
EXPECT_TRUE(lock.Try());
// We now have the lock....
// This thread will not be able to get the lock.
{
TryLockTestThread thread(&lock);
PlatformThreadHandle handle = kNullThreadHandle;
EXPECT_TRUE(PlatformThread::Create(&thread, &handle));
PlatformThread::Join(handle);
EXPECT_FALSE(thread.got_lock());
}
lock.Unlock();
// This thread will....
{
TryLockTestThread thread(&lock);
PlatformThreadHandle handle = kNullThreadHandle;
EXPECT_TRUE(PlatformThread::Create(&thread, &handle));
PlatformThread::Join(handle);
EXPECT_TRUE(thread.got_lock());
// But it released it....
EXPECT_TRUE(lock.Try());
}
lock.Unlock();
return true;
}
// Tests that locks actually exclude -------------------------------------------
class MutexLockTestThread : public PlatformThread::Delegate {
public:
MutexLockTestThread(Lock* lock, int* value) : lock_(lock), value_(value) {}
// Static helper which can also be called from the main thread.
static void DoStuff(Lock* lock, int* value) {
for (int i = 0; i < 40; i++) {
lock->Acquire();
int v = *value;
PlatformThread::Sleep(rand() % 10);
*value = v + 1;
lock->Unlock();
}
}
virtual void ThreadMain() {
DoStuff(lock_, value_);
}
private:
Lock* lock_;
int* value_;
NO_COPY_AND_ASSIGN(MutexLockTestThread);
};
bool MutexTwoThreads() {
Lock lock;
int value = 0;
MutexLockTestThread thread(&lock, &value);
PlatformThreadHandle handle = kNullThreadHandle;
EXPECT_TRUE(PlatformThread::Create(&thread, &handle));
MutexLockTestThread::DoStuff(&lock, &value);
PlatformThread::Join(handle);
EXPECT_EQ(2 * 40, value);
return true;
}
bool MutexFourThreads() {
Lock lock;
int value = 0;
MutexLockTestThread thread1(&lock, &value);
MutexLockTestThread thread2(&lock, &value);
MutexLockTestThread thread3(&lock, &value);
PlatformThreadHandle handle1 = kNullThreadHandle;
PlatformThreadHandle handle2 = kNullThreadHandle;
PlatformThreadHandle handle3 = kNullThreadHandle;
EXPECT_TRUE(PlatformThread::Create(&thread1, &handle1));
EXPECT_TRUE(PlatformThread::Create(&thread2, &handle2));
EXPECT_TRUE(PlatformThread::Create(&thread3, &handle3));
MutexLockTestThread::DoStuff(&lock, &value);
PlatformThread::Join(handle1);
PlatformThread::Join(handle2);
PlatformThread::Join(handle3);
EXPECT_EQ(4 * 40, value);
return true;
}
} // namespace sfntly
TEST(LockTest, Basic) {
ASSERT_TRUE(sfntly::BasicLockTest());
}
TEST(LockTest, TryLock) {
ASSERT_TRUE(sfntly::TryLockTest());
}
TEST(LockTest, Mutex) {
ASSERT_TRUE(sfntly::MutexTwoThreads());
ASSERT_TRUE(sfntly::MutexFourThreads());
}
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