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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:
struct TWaitHandle {
inline TWaitHandle() noexcept
: Signalled(false)
, Parent(nullptr)
{
}
inline void Signal() noexcept {
TGuard<TSpinLock> lock(M_);
Signalled = true;
if (Parent) {
Parent->Notify(this);
}
}
inline void Register(TWaitQueue* parent) noexcept {
TGuard<TSpinLock> lock(M_);
Parent = parent;
if (Signalled) {
if (Parent) {
Parent->Notify(this);
}
}
}
NAtomic::TBool Signalled;
TWaitQueue* Parent;
TSpinLock M_;
};
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;
TWaitQueue hndl;
wh.Register(&hndl);
Y_DEFER {
wh.Register(nullptr);
};
WaitForMultipleObj(hndl, deadLine, func);
return func.Signalled;
}
}
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