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#include "threadparkpad.h"
#include <util/system/winint.h>
#ifdef _linux_
#include "futex.h"
namespace NActors {
class TThreadParkPad::TImpl {
volatile bool Interrupted;
int Futex;
public:
TImpl()
: Interrupted(false)
, Futex(0)
{
}
~TImpl() {
}
bool Park() noexcept {
__atomic_fetch_sub(&Futex, 1, __ATOMIC_SEQ_CST);
while (__atomic_load_n(&Futex, __ATOMIC_ACQUIRE) == -1)
SysFutex(&Futex, FUTEX_WAIT_PRIVATE, -1, nullptr, nullptr, 0);
return IsInterrupted();
}
void Unpark() noexcept {
const int old = __atomic_fetch_add(&Futex, 1, __ATOMIC_SEQ_CST);
if (old == -1)
SysFutex(&Futex, FUTEX_WAKE_PRIVATE, -1, nullptr, nullptr, 0);
}
void Interrupt() noexcept {
__atomic_store_n(&Interrupted, true, __ATOMIC_SEQ_CST);
Unpark();
}
bool IsInterrupted() const noexcept {
return __atomic_load_n(&Interrupted, __ATOMIC_ACQUIRE);
}
};
#elif defined _win32_
#include <library/cpp/deprecated/atomic/atomic.h>
#include <util/generic/bt_exception.h>
#include <util/generic/yexception.h>
namespace NActors {
class TThreadParkPad::TImpl {
TAtomic Interrupted;
HANDLE EvHandle;
public:
TImpl()
: Interrupted(false)
{
EvHandle = ::CreateEvent(0, false, false, 0);
if (!EvHandle)
ythrow TWithBackTrace<yexception>() << "::CreateEvent failed";
}
~TImpl() {
if (EvHandle)
::CloseHandle(EvHandle);
}
bool Park() noexcept {
::WaitForSingleObject(EvHandle, INFINITE);
return AtomicGet(Interrupted);
}
void Unpark() noexcept {
::SetEvent(EvHandle);
}
void Interrupt() noexcept {
AtomicSet(Interrupted, true);
Unpark();
}
bool IsInterrupted() const noexcept {
return AtomicGet(Interrupted);
}
};
#else
#include <library/cpp/deprecated/atomic/atomic.h>
#include <util/system/event.h>
namespace NActors {
class TThreadParkPad::TImpl {
TAtomic Interrupted;
TSystemEvent Ev;
public:
TImpl()
: Interrupted(false)
, Ev(TSystemEvent::rAuto)
{
}
~TImpl() {
}
bool Park() noexcept {
Ev.Wait();
return AtomicGet(Interrupted);
}
void Unpark() noexcept {
Ev.Signal();
}
void Interrupt() noexcept {
AtomicSet(Interrupted, true);
Unpark();
}
bool IsInterrupted() const noexcept {
return AtomicGet(Interrupted);
}
};
#endif
TThreadParkPad::TThreadParkPad()
: Impl(new TThreadParkPad::TImpl())
{
}
TThreadParkPad::~TThreadParkPad() {
}
bool TThreadParkPad::Park() noexcept {
return Impl->Park();
}
void TThreadParkPad::Unpark() noexcept {
Impl->Unpark();
}
void TThreadParkPad::Interrupt() noexcept {
Impl->Interrupt();
}
bool TThreadParkPad::Interrupted() const noexcept {
return Impl->IsInterrupted();
}
}
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