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// Copyright (C) Microsoft Corporation. All rights reserved.
#pragma once
#include <KMacros.h>
#if _KERNEL_MODE
typedef wistd::integral_constant<EVENT_TYPE, SynchronizationEvent> auto_reset_event_t;
#else
typedef wistd::integral_constant<bool, false> auto_reset_event_t;
#endif
#if _KERNEL_MODE
typedef wistd::integral_constant<EVENT_TYPE, NotificationEvent> manual_reset_event_t;
#else
typedef wistd::integral_constant<bool, true> manual_reset_event_t;
#endif
#define WIN_VERIFY NT_VERIFY
#define WIN_ASSERT NT_ASSERT
template<typename TEventType>
class KWaitEventBase
{
public:
KWaitEventBase() = default;
#ifdef _KERNEL_MODE
NONPAGED ~KWaitEventBase() = default;
#else
NONPAGED ~KWaitEventBase()
{
WIN_ASSERT(m_event == nullptr);
}
#endif
KWaitEventBase(KWaitEventBase &) = delete;
KWaitEventBase(KWaitEventBase &&) = delete;
KWaitEventBase & operator=(KWaitEventBase &) = delete;
KWaitEventBase & operator=(KWaitEventBase &&) = delete;
_IRQL_requires_max_(DISPATCH_LEVEL) void Set()
{
#if _KERNEL_MODE
KeSetEvent(&m_event, 0, false);
#else
WIN_VERIFY(SetEvent(m_event));
#endif
}
_IRQL_requires_max_(DISPATCH_LEVEL) void Clear()
{
#if _KERNEL_MODE
KeClearEvent(&m_event);
#else
WIN_VERIFY(ResetEvent(m_event));
#endif
}
PAGED void Wait()
{
#if _KERNEL_MODE
// Not used at runtime, but might be useful during debugging
volatile LARGE_INTEGER SystemTime;
KeQuerySystemTime(const_cast<LARGE_INTEGER*>(&SystemTime));
NTSTATUS NtStatus = KeWaitForSingleObject(
&m_event, Executive, KernelMode, FALSE, nullptr);
NT_VERIFY(NtStatus == STATUS_SUCCESS);
#else
ULONG r = WaitForSingleObject(m_event, INFINITE);
WIN_VERIFY(r == NO_ERROR);
#endif
}
PAGED bool Test()
{
#if _KERNEL_MODE
return !!KeReadStateEvent(&m_event);
#else
ULONG r = WaitForSingleObject(m_event, 0);
WIN_VERIFY(r == WAIT_TIMEOUT || r == WAIT_OBJECT_0);
return (r == WAIT_OBJECT_0);
#endif
}
NONPAGED bool TestNP()
{
#if _KERNEL_MODE
return !!KeReadStateEvent(&m_event);
#else
ULONG r = WaitForSingleObject(m_event, 0);
WIN_VERIFY(r == WAIT_TIMEOUT || r == WAIT_OBJECT_0);
return (r == WAIT_OBJECT_0);
#endif
}
protected:
PAGED void InitializeBase()
{
#if _KERNEL_MODE
KeInitializeEvent(&m_event, TEventType(), FALSE);
#else
m_event = CreateEventW(nullptr, TEventType(), false, nullptr);
WIN_VERIFY(m_event);
#endif
}
NONPAGED void CleanupBase()
{
#ifndef _KERNEL_MODE
CloseHandle(m_event);
m_event = nullptr;
#endif
}
private:
#if _KERNEL_MODE
KEVENT m_event;
#else
HANDLE m_event;
#endif
};
class KWaitEvent : public KWaitEventBase<manual_reset_event_t>
{
public:
PAGED KWaitEvent() noexcept
{
InitializeBase();
}
NONPAGED ~KWaitEvent()
{
CleanupBase();
}
};
class KWaitEventManualConstruct : public KWaitEventBase<manual_reset_event_t>
{
public:
PAGED void Initialize()
{
InitializeBase();
}
PAGED void Cleanup()
{
CleanupBase();
}
};
class KAutoEvent : public KWaitEventBase<auto_reset_event_t>
{
public:
PAGED KAutoEvent() noexcept
{
InitializeBase();
}
NONPAGED ~KAutoEvent()
{
CleanupBase();
}
};
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