1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/**************************************************************************
A/V Stream Camera Sample
Copyright (c) 2013, Microsoft Corporation.
File:
Mutex.cpp
Abstract:
This file provides the implementation 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
**************************************************************************/
#include "Common.h"
//
// Dummy dtor. Required because the dtor is virtual.
//
KMutex::~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
KMutex::Lock(
_In_opt_ PLARGE_INTEGER Timeout
)
{
//DBG_ENTER(": Thread Owner = %p", m_Lock.OwnerThread);
NTSTATUS status =
KeWaitForSingleObject(
&m_Lock,
Executive,
KernelMode,
FALSE,
Timeout );
//DBG_LEAVE(": Status = %d Thread Owner = %p", status, m_Lock.OwnerThread);
return status;
}
//
// Preferred unlock method.
//
_IRQL_requires_max_(DISPATCH_LEVEL)
void
KMutex::Unlock()
{
//DBG_ENTER(": Thread Owner = %p", m_Lock.OwnerThread);
KeReleaseMutex( &m_Lock, FALSE );
//DBG_LEAVE(": Thread Owner = %p", m_Lock.OwnerThread);
}
|
