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#pragma once
#include "lfqueue.h"
#include <library/cpp/threading/atomic/bool.h>
#include <util/generic/vector.h>
#include <util/generic/scope.h>
#include <library/cpp/deprecated/atomic/atomic.h>
#include <library/cpp/deprecated/atomic/atomic_ops.h>
#include <util/system/event.h>
#include <util/system/spinlock.h>
namespace NNeh {
template <class T>
class TBlockedQueue: public TLockFreeQueue<T>, public TSystemEvent {
public:
inline TBlockedQueue() noexcept
: TSystemEvent(TSystemEvent::rAuto)
{
}
inline void Notify(T t) noexcept {
this->Enqueue(t);
Signal();
}
};
class TWaitQueue: public TThrRefBase {
public:
class TWaitHandle {
public:
~TWaitHandle() {
SwapWaitQueue(nullptr);
}
void Signal() noexcept {
Signalled_ = true;
if (TIntrusivePtr<TWaitQueue> q = SwapWaitQueue(nullptr)) {
q->Notify(this);
}
}
void Register(TIntrusivePtr<TWaitQueue>& waitQueue) noexcept {
if (Signalled_) {
waitQueue->Notify(this);
SwapWaitQueue(nullptr);
return;
}
waitQueue->Ref();
SwapWaitQueue(waitQueue.Get());
if (Signalled_) {
if (TIntrusivePtr<TWaitQueue> q = SwapWaitQueue(nullptr)) {
q->Notify(this);
}
}
}
bool Signalled() const {
return Signalled_;
}
void ResetState() {
Signalled_ = false;
SwapWaitQueue(nullptr);
}
private:
TIntrusivePtr<TWaitQueue> SwapWaitQueue(TWaitQueue* newQueue) noexcept {
return TIntrusivePtr<TWaitQueue>(AtomicSwap(&WaitQueue_, newQueue), TIntrusivePtr<TWaitQueue>::TNoIncrement());
}
private:
NAtomic::TBool Signalled_ = false;
TWaitQueue* WaitQueue_ = nullptr;
};
inline bool Wait(const TInstant& deadLine) noexcept {
return Q_.WaitD(deadLine);
}
inline void Notify(TWaitHandle* wq) noexcept {
Q_.Notify(wq);
}
inline bool Dequeue(TWaitHandle** wq) noexcept {
return Q_.Dequeue(wq);
}
private:
TBlockedQueue<TWaitHandle*> Q_;
};
typedef TWaitQueue::TWaitHandle TWaitHandle;
template <class T>
static inline void WaitForMultipleObj(TWaitQueue& hndl, const TInstant& deadLine, T& func) {
do {
TWaitHandle* ret = nullptr;
if (hndl.Dequeue(&ret)) {
do {
func(ret);
} while (hndl.Dequeue(&ret));
return;
}
} while (hndl.Wait(deadLine));
}
struct TSignalled {
inline TSignalled()
: Signalled(false)
{
}
inline void operator()(const TWaitHandle*) noexcept {
Signalled = true;
}
bool Signalled;
};
static inline bool WaitForOne(TWaitHandle& wh, const TInstant& deadLine) {
TSignalled func;
auto hndl = MakeIntrusive<TWaitQueue>();
wh.Register(hndl);
WaitForMultipleObj(*hndl, deadLine, func);
return func.Signalled;
}
}
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