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#include <library/cpp/threading/light_rw_lock/lightrwlock.h>
#include <util/random/random.h>
#ifdef _linux_
// Light rw lock is implemented only for linux
using namespace NS_LightRWLock;
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#define LIGHT
#ifdef RWSPINLOCK
#include <library/cpp/lwtrace/rwspinlock.h>
#endif
#define CHECK_LOGIC 1
#define LOOPCOUNT 1000000
#define RANRCOUNT 100
#define THREADCOUNT 40
#define WRITELOCKS 100
#if defined(_MSC_VER)
static int Y_FORCE_INLINE AtomicFetchAdd(volatile int& item, int value) {
return _InterlockedExchangeAdd((&item, value);
}
#elif defined(__GNUC__)
#else
#error unsupported platform
#endif
class TPosixRWLock {
public:
TPosixRWLock() {
}
~TPosixRWLock() {
pthread_rwlock_destroy(&rwlock);
}
TPosixRWLock(const TPosixRWLock&) = delete;
void operator=(const TPosixRWLock&) = delete;
private:
pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
friend class TPosixRWShareLocker;
friend class TPosixRWExclusiveLocker;
};
#if defined(LIGHT)
TLightRWLock __attribute__((aligned(64))) rwlock;
#elif defined(POSIX)
TPosixRWLock rwlock;
#elif defined(RWSPINLOCK)
TRWSpinLock __attribute__((aligned(64))) rwlock;
#else
#error "define lock type"
#endif
volatile __attribute__((aligned(64))) int checkIt = 0;
volatile int checkExcl = 0;
class TPosixRWShareLocker {
public:
TPosixRWShareLocker(TPosixRWLock& lock)
: LockP_(&lock)
{
pthread_rwlock_rdlock(&LockP_->rwlock);
}
~TPosixRWShareLocker() {
pthread_rwlock_unlock(&LockP_->rwlock);
}
TPosixRWShareLocker(const TPosixRWShareLocker&) = delete;
void operator=(const TPosixRWShareLocker&) = delete;
private:
TPosixRWLock* LockP_;
};
class TPosixRWExclusiveLocker {
public:
TPosixRWExclusiveLocker(TPosixRWLock& lock)
: LockP_(&lock)
{
pthread_rwlock_wrlock(&LockP_->rwlock);
}
~TPosixRWExclusiveLocker() {
pthread_rwlock_unlock(&LockP_->rwlock);
}
TPosixRWExclusiveLocker(const TPosixRWExclusiveLocker&) = delete;
void operator=(const TPosixRWExclusiveLocker&) = delete;
private:
TPosixRWLock* LockP_;
};
template <typename TLocker, bool excl>
static Y_FORCE_INLINE void Run() {
TLocker lockIt(rwlock);
#if defined(CHECK_LOGIC) && CHECK_LOGIC
if (!excl && checkExcl == 1) {
printf("there is a bug\n");
}
int result = AtomicFetchAdd(checkIt, 1);
if (excl)
checkExcl = 1;
if (excl && result > 1)
printf("there is a bug\n");
#endif
for (unsigned w = 0; w < RANRCOUNT; ++w)
RandomNumber<ui32>();
#if defined(CHECK_LOGIC) && CHECK_LOGIC
if (excl)
checkExcl = 0;
AtomicFetchAdd(checkIt, -1);
#endif
}
#ifdef LIGHT
static void* fast_thread_start(__attribute__((unused)) void* arg) {
for (unsigned q = 0; q < LOOPCOUNT; ++q) {
char excl = (RandomNumber<ui32>() % WRITELOCKS) == 0;
if (excl)
Run<TLightWriteGuard, 1>();
else
Run<TLightReadGuard, 0>();
}
return NULL;
}
#endif
#ifdef POSIX
static void* fast_thread_start(__attribute__((unused)) void* arg) {
for (unsigned q = 0; q < LOOPCOUNT; ++q) {
char excl = (RandomNumber<ui32>() % WRITELOCKS) == 0;
if (excl)
Run<TPosixRWExclusiveLocker, 1>();
else
Run<TPosixRWShareLocker, 0>();
}
return NULL;
}
#endif
#ifdef RWSPINLOCK
static void* fast_thread_start(__attribute__((unused)) void* arg) {
for (unsigned q = 0; q < LOOPCOUNT; ++q) {
char excl = (RandomNumber<ui32>() % WRITELOCKS) == 0;
if (excl)
Run<TWriteSpinLockGuard, 1>();
else
Run<TReadSpinLockGuard, 0>();
}
return NULL;
}
#endif
int main() {
pthread_t threads[THREADCOUNT];
for (unsigned q = 0; q < THREADCOUNT; ++q) {
pthread_create(&(threads[q]), NULL, &fast_thread_start, NULL);
}
for (unsigned q = 0; q < THREADCOUNT; ++q)
pthread_join(threads[q], NULL);
return 0;
}
#else // !_linux_
int main() {
return 0;
}
#endif
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