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#pragma once
#include "lfqueue.h"
#include <library/cpp/coroutine/engine/impl.h>
#include <library/cpp/coroutine/engine/network.h>
#include <library/cpp/deprecated/atomic/atomic.h>
#include <util/system/pipe.h>
#ifdef _linux_
#include <sys/eventfd.h>
#endif
#if defined(_bionic_) && !defined(EFD_SEMAPHORE)
#define EFD_SEMAPHORE 1
#endif
namespace NNeh {
#ifdef _linux_
class TSemaphoreEventFd {
public:
inline TSemaphoreEventFd() {
F_ = eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE);
if (F_ < 0) {
ythrow TFileError() << "failed to create a eventfd";
}
}
inline ~TSemaphoreEventFd() {
close(F_);
}
inline size_t Acquire(TCont* c) {
ui64 ev;
return NCoro::ReadI(c, F_, &ev, sizeof ev).Processed();
}
inline void Release() {
const static ui64 ev(1);
(void)write(F_, &ev, sizeof ev);
}
private:
int F_;
};
#endif
class TSemaphorePipe {
public:
inline TSemaphorePipe() {
TPipeHandle::Pipe(S_[0], S_[1]);
SetNonBlock(S_[0]);
SetNonBlock(S_[1]);
}
inline size_t Acquire(TCont* c) {
char ch;
return NCoro::ReadI(c, S_[0], &ch, 1).Processed();
}
inline size_t Acquire(TCont* c, char* buff, size_t buflen) {
return NCoro::ReadI(c, S_[0], buff, buflen).Processed();
}
inline void Release() {
char ch = 13;
S_[1].Write(&ch, 1);
}
private:
TPipeHandle S_[2];
};
class TPipeQueueBase {
public:
inline void Enqueue(void* job) {
Q_.Enqueue(job);
S_.Release();
}
inline void* Dequeue(TCont* c, char* ch, size_t buflen) {
void* ret = nullptr;
while (!Q_.Dequeue(&ret) && S_.Acquire(c, ch, buflen)) {
}
return ret;
}
inline void* Dequeue() noexcept {
void* ret = nullptr;
Q_.Dequeue(&ret);
return ret;
}
private:
TLockFreeQueue<void*> Q_;
TSemaphorePipe S_;
};
template <class T, size_t buflen = 1>
class TPipeQueue {
public:
template <class TPtr>
inline void EnqueueSafe(TPtr req) {
Enqueue(req.Get());
req.Release();
}
inline void Enqueue(T* req) {
Q_.Enqueue(req);
}
template <class TPtr>
inline void DequeueSafe(TCont* c, TPtr& ret) {
ret.Reset(Dequeue(c));
}
inline T* Dequeue(TCont* c) {
char ch[buflen];
return (T*)Q_.Dequeue(c, ch, sizeof(ch));
}
protected:
TPipeQueueBase Q_;
};
//optimized for avoiding unnecessary usage semaphore + use eventfd on linux
template <class T>
struct TOneConsumerPipeQueue {
inline TOneConsumerPipeQueue()
: Signaled_(0)
, SkipWait_(0)
{
}
inline void Enqueue(T* job) {
Q_.Enqueue(job);
AtomicSet(SkipWait_, 1);
if (AtomicCas(&Signaled_, 1, 0)) {
S_.Release();
}
}
inline T* Dequeue(TCont* c) {
T* ret = nullptr;
while (!Q_.Dequeue(&ret)) {
AtomicSet(Signaled_, 0);
if (!AtomicCas(&SkipWait_, 0, 1)) {
if (!S_.Acquire(c)) {
break;
}
}
AtomicSet(Signaled_, 1);
}
return ret;
}
template <class TPtr>
inline void EnqueueSafe(TPtr req) {
Enqueue(req.Get());
Y_UNUSED(req.Release());
}
template <class TPtr>
inline void DequeueSafe(TCont* c, TPtr& ret) {
ret.Reset(Dequeue(c));
}
protected:
TLockFreeQueue<T*> Q_;
#ifdef _linux_
TSemaphoreEventFd S_;
#else
TSemaphorePipe S_;
#endif
TAtomic Signaled_;
TAtomic SkipWait_;
};
template <class T, size_t buflen = 1>
struct TAutoPipeQueue: public TPipeQueue<T, buflen> {
~TAutoPipeQueue() {
while (T* t = (T*)TPipeQueue<T, buflen>::Q_.Dequeue()) {
delete t;
}
}
};
template <class T>
struct TAutoOneConsumerPipeQueue: public TOneConsumerPipeQueue<T> {
~TAutoOneConsumerPipeQueue() {
T* ret = nullptr;
while (TOneConsumerPipeQueue<T>::Q_.Dequeue(&ret)) {
delete ret;
}
}
};
}
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