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/**************************************************************************
A/V Stream Camera Sample
Copyright (c) 2013, Microsoft Corporation.
File:
Mutex.h
Abstract:
This file provides the declaration of KMutex and KScopedMutex.
KMutex provides a wrapper around a KMUTEX object. KScopedMutex is
provided as a helper class to ensure all exits release the lock.
History:
created 7/16/2013
**************************************************************************/
#pragma once
//
// Specialized class for KMUTEX
//
class KMutex : CNonCopyable
{
KMUTEX m_Lock;
public:
KMutex()
{
KeInitializeMutex( &m_Lock, 0 );
}
virtual ~KMutex();
//
// Preferred lock method.
//
_IRQL_requires_min_(PASSIVE_LEVEL)
_When_((Timeout==NULL || Timeout->QuadPart!=0), _IRQL_requires_max_(APC_LEVEL))
_When_((Timeout!=NULL &&Timeout->QuadPart==0), _IRQL_requires_max_(DISPATCH_LEVEL))
NTSTATUS
Lock(
_In_opt_ PLARGE_INTEGER Timeout=nullptr
);
//
// Preferred unlock method.
//
_IRQL_requires_max_(DISPATCH_LEVEL)
void
Unlock();
};
//
// Use this class to hold a spinlock through a particular scope
//
class KScopedMutex : CNonCopyable
{
KMutex &m_Lock;
public:
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(APC_LEVEL)
KScopedMutex( KMutex &lock )
: m_Lock(lock)
{
m_Lock.Lock();
}
_IRQL_requires_max_(DISPATCH_LEVEL)
~KScopedMutex(void)
{
m_Lock.Unlock();
}
};
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