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#include <library/cpp/threading/light_rw_lock/lightrwlock.h>
#include <library/cpp/testing/unittest/registar.h>
#include <util/generic/ptr.h>
#include <util/random/random.h>
#include <util/thread/pool.h>
class TRWMutexTest: public TTestBase {
UNIT_TEST_SUITE(TRWMutexTest);
UNIT_TEST(TestConcurrentReadAccess)
UNIT_TEST(TestExclusiveWriteAccess)
UNIT_TEST(TestSharedData)
UNIT_TEST_SUITE_END();
class TOneShotEvent {
public:
void Wait() {
Released_.wait(false, std::memory_order_acquire);
}
void Release() {
Released_.store(true, std::memory_order_release);
Released_.notify_all();
}
private:
std::atomic<bool> Released_{false};
};
struct TSharedData {
TSharedData()
: WritersIn(0)
, ReadersIn(0)
, Counter(0)
{
}
std::atomic<ui32> WritersIn;
std::atomic<ui32> ReadersIn;
void IncWriters() {
WritersIn.fetch_add(1, std::memory_order_relaxed);
}
void DecWriters() {
WritersIn.fetch_sub(1, std::memory_order_relaxed);
}
ui32 LoadWriters() {
return WritersIn.load(std::memory_order_relaxed);
}
void IncReaders() {
ReadersIn.fetch_add(1, std::memory_order_relaxed);
}
void DecReaders() {
ReadersIn.fetch_sub(1, std::memory_order_relaxed);
}
ui32 LoadReaders() {
return ReadersIn.load(std::memory_order_relaxed);
}
std::atomic_flag Failed = ATOMIC_FLAG_INIT;
void SetFailed() {
Failed.test_and_set(std::memory_order_relaxed);
}
bool TestFailed() {
return Failed.test(std::memory_order_relaxed);
}
ui64 Counter;
TLightRWLock Mutex;
TOneShotEvent Event;
};
class TThreadTask: public IObjectInQueue {
public:
using PFunc = void (TThreadTask::*)(void);
TThreadTask(PFunc func, TSharedData& data, size_t id, size_t total)
: Func_(func)
, Data_(data)
, Id_(id)
, Total_(total)
{
}
void Process(void*) override {
THolder<TThreadTask> This(this);
(this->*Func_)();
}
#define FAIL_ASSERT(cond) \
if (!(cond)) { \
Data_.SetFailed(); \
}
void RunConcurrentReadAccess() {
Data_.Mutex.AcquireRead();
Data_.IncReaders();
if (Data_.LoadReaders() != Total_) {
Data_.Event.Wait();
}
Data_.Event.Release();
Data_.DecReaders();
Data_.Mutex.ReleaseRead();
}
void RunExclusiveWriteAccess() {
if (Id_ % 2 == 0) {
for (size_t i = 0; i < 10; ++i) {
Data_.Mutex.AcquireRead();
Data_.IncReaders();
FAIL_ASSERT(Data_.LoadWriters() == 0);
usleep(RandomNumber<ui32>() % 5);
Data_.DecReaders();
Data_.Mutex.ReleaseRead();
}
} else {
for (size_t i = 0; i < 10; ++i) {
Data_.Mutex.AcquireWrite();
Data_.IncWriters();
FAIL_ASSERT(Data_.LoadReaders() == 0 && Data_.LoadWriters() == 1);
usleep(RandomNumber<ui32>() % 5);
Data_.DecWriters();
Data_.Mutex.ReleaseWrite();
}
}
}
void RunSharedData() {
if (Id_ % 2 == 0) {
ui64 localCounter = 0;
Y_UNUSED(localCounter);
for (size_t i = 0; i < 1000; ++i) {
Data_.Mutex.AcquireRead();
localCounter = Data_.Counter;
Data_.Mutex.ReleaseRead();
}
} else {
for (size_t i = 0; i < 1000; ++i) {
Data_.Mutex.AcquireWrite();
++Data_.Counter;
Data_.Mutex.ReleaseWrite();
}
}
}
#undef FAIL_ASSERT
private:
PFunc Func_;
TSharedData& Data_;
size_t Id_;
size_t Total_;
};
private:
#define RUN_CYCLE(what, count) \
Data_.Reset(MakeHolder<TSharedData>()); \
Q_.Start(count); \
for (size_t i = 0; i < count; ++i) { \
UNIT_ASSERT(Q_.Add(new TThreadTask(&TThreadTask::what, *Data_, i, count))); \
} \
Q_.Stop(); \
UNIT_ASSERT(!Data_->TestFailed());
void TestConcurrentReadAccess() {
RUN_CYCLE(RunConcurrentReadAccess, 5);
}
void TestExclusiveWriteAccess() {
RUN_CYCLE(RunExclusiveWriteAccess, 4);
}
void TestSharedData() {
// TODO: Fix Tsan error
// RUN_CYCLE(RunSharedData, 4);
}
#undef RUN_CYCLE
private:
THolder<TSharedData> Data_;
TThreadPool Q_;
};
UNIT_TEST_SUITE_REGISTRATION(TRWMutexTest)
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