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#include "rq.h"
#include "lfqueue.h"
#include <library/cpp/threading/atomic/bool.h>
#include <util/system/tls.h>
#include <util/system/pipe.h>
#include <util/system/event.h>
#include <util/system/mutex.h>
#include <util/system/condvar.h>
#include <util/system/guard.h>
#include <util/network/socket.h>
#include <util/generic/deque.h>
using namespace NNeh;
namespace {
class TBaseLockFreeRequestQueue: public IRequestQueue {
public:
void Clear() override {
IRequestRef req;
while (Q_.Dequeue(&req)) {
}
}
protected:
NNeh::TAutoLockFreeQueue<IRequest> Q_;
};
class TFdRequestQueue: public TBaseLockFreeRequestQueue {
public:
inline TFdRequestQueue() {
TPipeHandle::Pipe(R_, W_);
SetNonBlock(W_);
}
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
char ch = 42;
W_.Write(&ch, 1);
}
IRequestRef Next() override {
IRequestRef ret;
#if 0
for (size_t i = 0; i < 20; ++i) {
if (Q_.Dequeue(&ret)) {
return ret;
}
//asm volatile ("pause;");
}
#endif
while (!Q_.Dequeue(&ret)) {
char ch;
R_.Read(&ch, 1);
}
return ret;
}
private:
TPipeHandle R_;
TPipeHandle W_;
};
struct TNehFdEvent {
inline TNehFdEvent() {
TPipeHandle::Pipe(R, W);
SetNonBlock(W);
}
inline void Signal() noexcept {
char ch = 21;
W.Write(&ch, 1);
}
inline void Wait() noexcept {
char buf[128];
R.Read(buf, sizeof(buf));
}
TPipeHandle R;
TPipeHandle W;
};
template <class TEvent>
class TEventRequestQueue: public TBaseLockFreeRequestQueue {
public:
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
E_.Signal();
}
IRequestRef Next() override {
IRequestRef ret;
while (!Q_.Dequeue(&ret)) {
E_.Wait();
}
E_.Signal();
return ret;
}
private:
TEvent E_;
};
template <class TEvent>
class TLazyEventRequestQueue: public TBaseLockFreeRequestQueue {
public:
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
if (C_.Val()) {
E_.Signal();
}
}
IRequestRef Next() override {
IRequestRef ret;
C_.Inc();
while (!Q_.Dequeue(&ret)) {
E_.Wait();
}
C_.Dec();
if (Q_.Size() && C_.Val()) {
E_.Signal();
}
return ret;
}
private:
TEvent E_;
TAtomicCounter C_;
};
class TCondVarRequestQueue: public IRequestQueue {
public:
void Clear() override {
TGuard<TMutex> g(M_);
Q_.clear();
}
void Schedule(IRequestRef req) override {
{
TGuard<TMutex> g(M_);
Q_.push_back(req);
}
C_.Signal();
}
IRequestRef Next() override {
TGuard<TMutex> g(M_);
while (Q_.empty()) {
C_.Wait(M_);
}
IRequestRef ret = *Q_.begin();
Q_.pop_front();
return ret;
}
private:
TDeque<IRequestRef> Q_;
TMutex M_;
TCondVar C_;
};
class TBusyRequestQueue: public TBaseLockFreeRequestQueue {
public:
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
}
IRequestRef Next() override {
IRequestRef ret;
while (!Q_.Dequeue(&ret)) {
}
return ret;
}
};
class TSleepRequestQueue: public TBaseLockFreeRequestQueue {
public:
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
}
IRequestRef Next() override {
IRequestRef ret;
while (!Q_.Dequeue(&ret)) {
usleep(1);
}
return ret;
}
};
struct TStupidEvent {
inline TStupidEvent()
: InWait(false)
{
}
inline bool Signal() noexcept {
const bool ret = InWait;
Ev.Signal();
return ret;
}
inline void Wait() noexcept {
InWait = true;
Ev.Wait();
InWait = false;
}
TAutoEvent Ev;
NAtomic::TBool InWait;
};
template <class TEvent>
class TLFRequestQueue: public TBaseLockFreeRequestQueue {
struct TLocalQueue: public TEvent {
};
public:
void Schedule(IRequestRef req) override {
Q_.Enqueue(req);
for (TLocalQueue* lq = 0; FQ_.Dequeue(&lq) && !lq->Signal();) {
}
}
IRequestRef Next() override {
while (true) {
IRequestRef ret;
if (Q_.Dequeue(&ret)) {
return ret;
}
TLocalQueue* lq = LocalQueue();
FQ_.Enqueue(lq);
if (Q_.Dequeue(&ret)) {
TLocalQueue* besttry;
if (FQ_.Dequeue(&besttry)) {
if (besttry == lq) {
//huraay, get rid of spurious wakeup
} else {
FQ_.Enqueue(besttry);
}
}
return ret;
}
lq->Wait();
}
}
private:
static inline TLocalQueue* LocalQueue() noexcept {
Y_POD_STATIC_THREAD(TLocalQueue*)
lq((TLocalQueue*)0);
if (!lq) {
Y_STATIC_THREAD(TLocalQueue)
slq;
lq = &(TLocalQueue&)slq;
}
return lq;
}
private:
TLockFreeStack<TLocalQueue*> FQ_;
};
}
IRequestQueueRef NNeh::CreateRequestQueue() {
//return new TCondVarRequestQueue();
//return new TSleepRequestQueue();
//return new TBusyRequestQueue();
//return new TLFRequestQueue<TStupidEvent>();
#if defined(_freebsd_)
return new TFdRequestQueue();
#endif
//return new TFdRequestQueue();
return new TLazyEventRequestQueue<TAutoEvent>();
//return new TEventRequestQueue<TAutoEvent>();
//return new TEventRequestQueue<TNehFdEvent>();
}
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