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//===-- tsan_mutex_test.cc ------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_mutex.h"
#include "tsan_mutex.h"
#include "gtest/gtest.h"
namespace __tsan {
template<typename MutexType>
class TestData {
public:
explicit TestData(MutexType *mtx)
: mtx_(mtx) {
for (int i = 0; i < kSize; i++)
data_[i] = 0;
}
void Write() {
Lock l(mtx_);
T v0 = data_[0];
for (int i = 0; i < kSize; i++) {
CHECK_EQ(data_[i], v0);
data_[i]++;
}
}
void Read() {
ReadLock l(mtx_);
T v0 = data_[0];
for (int i = 0; i < kSize; i++) {
CHECK_EQ(data_[i], v0);
}
}
void Backoff() {
volatile T data[kSize] = {};
for (int i = 0; i < kSize; i++) {
data[i]++;
CHECK_EQ(data[i], 1);
}
}
private:
typedef GenericScopedLock<MutexType> Lock;
static const int kSize = 64;
typedef u64 T;
MutexType *mtx_;
char pad_[kCacheLineSize];
T data_[kSize];
};
const int kThreads = 8;
const int kWriteRate = 1024;
#if SANITIZER_DEBUG
const int kIters = 16*1024;
#else
const int kIters = 64*1024;
#endif
template<typename MutexType>
static void *write_mutex_thread(void *param) {
TestData<MutexType> *data = (TestData<MutexType>*)param;
for (int i = 0; i < kIters; i++) {
data->Write();
data->Backoff();
}
return 0;
}
template<typename MutexType>
static void *read_mutex_thread(void *param) {
TestData<MutexType> *data = (TestData<MutexType>*)param;
for (int i = 0; i < kIters; i++) {
if ((i % kWriteRate) == 0)
data->Write();
else
data->Read();
data->Backoff();
}
return 0;
}
TEST(Mutex, Write) {
Mutex mtx(MutexTypeAnnotations, StatMtxAnnotations);
TestData<Mutex> data(&mtx);
pthread_t threads[kThreads];
for (int i = 0; i < kThreads; i++)
pthread_create(&threads[i], 0, write_mutex_thread<Mutex>, &data);
for (int i = 0; i < kThreads; i++)
pthread_join(threads[i], 0);
}
TEST(Mutex, ReadWrite) {
Mutex mtx(MutexTypeAnnotations, StatMtxAnnotations);
TestData<Mutex> data(&mtx);
pthread_t threads[kThreads];
for (int i = 0; i < kThreads; i++)
pthread_create(&threads[i], 0, read_mutex_thread<Mutex>, &data);
for (int i = 0; i < kThreads; i++)
pthread_join(threads[i], 0);
}
TEST(Mutex, SpinWrite) {
SpinMutex mtx;
TestData<SpinMutex> data(&mtx);
pthread_t threads[kThreads];
for (int i = 0; i < kThreads; i++)
pthread_create(&threads[i], 0, write_mutex_thread<SpinMutex>, &data);
for (int i = 0; i < kThreads; i++)
pthread_join(threads[i], 0);
}
} // namespace __tsan
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