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DavidXanatos 2022-05-19 19:44:21 +02:00
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commit c969ef7ec9
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120
SandboxiePlus/SandMan/Helpers/ReadDirectoryChanges.cpp Normal file
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//
// The MIT License
//
// Copyright (c) 2010 James E Beveridge
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// This sample code is for my blog entry titled, "Understanding ReadDirectoryChangesW"
// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
// See ReadMe.txt for overview information.
#include "stdafx.h"
#include "ReadDirectoryChanges.h"
#include "ReadDirectoryChangesPrivate.h"
using namespace ReadDirectoryChangesPrivate;
///////////////////////////////////////////////////////////////////////////
// CReadDirectoryChanges
CReadDirectoryChanges::CReadDirectoryChanges()// int nMaxCount) : m_Notifications(nMaxCount)
{
m_hThread = NULL;
m_dwThreadId= 0;
m_pServer = new CReadChangesServer(this);
}
CReadDirectoryChanges::~CReadDirectoryChanges()
{
Terminate();
delete m_pServer;
}
void CReadDirectoryChanges::Init()
{
//
// Kick off the worker thread, which will be
// managed by CReadChangesServer.
//
m_hThread = (HANDLE)_beginthreadex(NULL,
0,
CReadChangesServer::ThreadStartProc,
m_pServer,
0,
&m_dwThreadId
);
}
void CReadDirectoryChanges::Terminate()
{
if (m_hThread)
{
::QueueUserAPC(CReadChangesServer::TerminateProc, m_hThread, (ULONG_PTR)m_pServer);
::WaitForSingleObjectEx(m_hThread, 10000, true);
::CloseHandle(m_hThread);
m_hThread = NULL;
m_dwThreadId = 0;
}
}
void CReadDirectoryChanges::AddDirectory( LPCTSTR szDirectory, BOOL bWatchSubtree, DWORD dwNotifyFilter, DWORD dwBufferSize )
{
if (!m_hThread)
Init();
CReadChangesRequest* pRequest = new CReadChangesRequest(m_pServer, szDirectory, bWatchSubtree, dwNotifyFilter, dwBufferSize);
QueueUserAPC(CReadChangesServer::AddDirectoryProc, m_hThread, (ULONG_PTR)pRequest);
}
void CReadDirectoryChanges::DetachDirectory( LPCTSTR szDirectory )
{
if (!m_hThread)
Init();
pair<ReadDirectoryChangesPrivate::CReadChangesServer*, wstring>* pRequest = new pair<ReadDirectoryChangesPrivate::CReadChangesServer*, wstring>(m_pServer, szDirectory);
QueueUserAPC(CReadChangesServer::DetachDirectoryProc, m_hThread, (ULONG_PTR)pRequest);
}
//void CReadDirectoryChanges::Push(DWORD dwAction, wstring& wstrFilename)
//{
// m_Notifications.push( TDirectoryChangeNotification(dwAction, wstrFilename) );
//}
//
//bool CReadDirectoryChanges::Pop(DWORD& dwAction, wstring& wstrFilename)
//{
// TDirectoryChangeNotification pair;
// if (!m_Notifications.pop(pair))
// return false;
//
// dwAction = pair.first;
// wstrFilename = pair.second;
//
// return true;
//}
//
//bool CReadDirectoryChanges::CheckOverflow()
//{
// bool b = m_Notifications.overflow();
// if (b)
// m_Notifications.clear();
// return b;
//}

148
SandboxiePlus/SandMan/Helpers/ReadDirectoryChanges.h Normal file
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//
// The MIT License
//
// Copyright (c) 2010 James E Beveridge
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// This sample code is for my blog entry titled, "Understanding ReadDirectoryChangesW"
// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
// See ReadMe.txt for overview information.
#pragma once
#include <windows.h>
#include "ThreadSafeQueue.h"
typedef pair<DWORD,wstring> TDirectoryChangeNotification;
namespace ReadDirectoryChangesPrivate
{
class CReadChangesServer;
}
///////////////////////////////////////////////////////////////////////////
/// <summary>
/// Track changes to filesystem directories and report them
/// to the caller via a thread-safe queue.
/// </summary>
/// <remarks>
/// <para>
/// This sample code is based on my blog entry titled, "Understanding ReadDirectoryChangesW"
/// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
/// </para><para>
/// All functions in CReadDirectoryChangesServer run in
/// the context of the calling thread.
/// </para>
/// <example><code>
/// CReadDirectoryChanges changes;
/// changes.AddDirectory(_T("C:\\"), false, dwNotificationFlags);
///
/// const HANDLE handles[] = { hStopEvent, changes.GetWaitHandle() };
///
/// while (!bTerminate)
/// {
/// ::MsgWaitForMultipleObjectsEx(
/// _countof(handles),
/// handles,
/// INFINITE,
/// QS_ALLINPUT,
/// MWMO_INPUTAVAILABLE | MWMO_ALERTABLE);
/// switch (rc)
/// {
/// case WAIT_OBJECT_0 + 0:
/// bTerminate = true;
/// break;
/// case WAIT_OBJECT_0 + 1:
/// // We've received a notification in the queue.
/// {
/// DWORD dwAction;
/// wstring wstrFilename;
/// changes.Pop(dwAction, wstrFilename);
/// wprintf(L"%s %s\n", ExplainAction(dwAction), wstrFilename);
/// }
/// break;
/// case WAIT_OBJECT_0 + _countof(handles):
/// // Get and dispatch message
/// break;
/// case WAIT_IO_COMPLETION:
/// // APC complete.No action needed.
/// break;
/// }
/// }
/// </code></example>
/// </remarks>
class CReadDirectoryChanges
{
public:
CReadDirectoryChanges();// int nMaxChanges = 1000);
~CReadDirectoryChanges();
void Init();
void Terminate();
/// <summary>
/// Add a new directory to be monitored.
/// </summary>
/// <param name="wszDirectory">Directory to monitor.</param>
/// <param name="bWatchSubtree">True to also monitor subdirectories.</param>
/// <param name="dwNotifyFilter">The types of file system events to monitor, such as FILE_NOTIFY_CHANGE_ATTRIBUTES.</param>
/// <param name="dwBufferSize">The size of the buffer used for overlapped I/O.</param>
/// <remarks>
/// <para>
/// This function will make an APC call to the worker thread to issue a new
/// ReadDirectoryChangesW call for the given directory with the given flags.
/// </para>
/// </remarks>
void AddDirectory( LPCTSTR wszDirectory, BOOL bWatchSubtree, DWORD dwNotifyFilter, DWORD dwBufferSize=16384 );
void DetachDirectory( LPCTSTR wszDirectory );
virtual void Notify( const wstring& strDirectory ) {}
/// <summary>
/// Return a handle for the Win32 Wait... functions that will be
/// signaled when there is a queue entry.
/// </summary>
//HANDLE GetWaitHandle() { return m_Notifications.GetWaitHandle(); }
//
//bool Pop(DWORD& dwAction, wstring& wstrFilename);
//
//// "Push" is for usage by ReadChangesRequest. Not intended for external usage.
//void Push(DWORD dwAction, wstring& wstrFilename);
//
//// Check if the queue overflowed. If so, clear it and return true.
//bool CheckOverflow();
unsigned int GetThreadId() { return m_dwThreadId; }
protected:
ReadDirectoryChangesPrivate::CReadChangesServer* m_pServer;
HANDLE m_hThread;
unsigned int m_dwThreadId;
//CThreadSafeQueue<TDirectoryChangeNotification> m_Notifications;
};

183
SandboxiePlus/SandMan/Helpers/ReadDirectoryChangesPrivate.cpp Normal file
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//
// The MIT License
//
// Copyright (c) 2010 James E Beveridge
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// This sample code is for my blog entry titled, "Understanding ReadDirectoryChangesW"
// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
// See ReadMe.txt for overview information.
#include "stdafx.h"
#include "ReadDirectoryChanges.h"
#include "ReadDirectoryChangesPrivate.h"
#include <shlwapi.h>
// The namespace is a convenience to emphasize that these are internals
// interfaces. The namespace can be safely removed if you need to.
namespace ReadDirectoryChangesPrivate
{
///////////////////////////////////////////////////////////////////////////
// CReadChangesRequest
CReadChangesRequest::CReadChangesRequest(CReadChangesServer* pServer, LPCTSTR sz, BOOL b, DWORD dw, DWORD size)
{
m_pServer = pServer;
m_dwFilterFlags = dw;
m_bIncludeChildren = b;
m_wstrDirectory = sz;
m_hDirectory = 0;
::ZeroMemory(&m_Overlapped, sizeof(OVERLAPPED));
// The hEvent member is not used when there is a completion
// function, so it's ok to use it to point to the object.
m_Overlapped.hEvent = this;
m_Buffer.resize(size);
m_BackupBuffer.resize(size);
}
CReadChangesRequest::~CReadChangesRequest()
{
// RequestTermination() must have been called successfully.
_ASSERTE(m_hDirectory == NULL || m_hDirectory == INVALID_HANDLE_VALUE);
}
bool CReadChangesRequest::OpenDirectory()
{
// Allow this routine to be called redundantly.
if (m_hDirectory)
return true;
m_hDirectory = ::CreateFileW(
m_wstrDirectory.c_str(), // pointer to the file name
FILE_LIST_DIRECTORY, // access (read/write) mode
FILE_SHARE_READ // share mode
| FILE_SHARE_WRITE
| FILE_SHARE_DELETE,
NULL, // security descriptor
OPEN_EXISTING, // how to create
FILE_FLAG_BACKUP_SEMANTICS // file attributes
| FILE_FLAG_OVERLAPPED,
NULL); // file with attributes to copy
if (m_hDirectory == INVALID_HANDLE_VALUE)
{
return false;
}
return true;
}
void CReadChangesRequest::BeginRead()
{
DWORD dwBytes=0;
// This call needs to be reissued after every APC.
BOOL success = ::ReadDirectoryChangesW(
m_hDirectory, // handle to directory
&m_Buffer[0], // read results buffer
m_Buffer.size(), // length of buffer
m_bIncludeChildren, // monitoring option
m_dwFilterFlags, // filter conditions
&dwBytes, // bytes returned
&m_Overlapped, // overlapped buffer
&NotificationCompletion); // completion routine
}
//static
VOID CALLBACK CReadChangesRequest::NotificationCompletion(
DWORD dwErrorCode, // completion code
DWORD dwNumberOfBytesTransfered, // number of bytes transferred
LPOVERLAPPED lpOverlapped) // I/O information buffer
{
CReadChangesRequest* pBlock = (CReadChangesRequest*)lpOverlapped->hEvent;
if (dwErrorCode == ERROR_OPERATION_ABORTED)
{
::InterlockedDecrement(&pBlock->m_pServer->m_nOutstandingRequests);
delete pBlock;
return;
}
// This might mean overflow? Not sure.
if(!dwNumberOfBytesTransfered)
return;
// Can't use sizeof(FILE_NOTIFY_INFORMATION) because
// the structure is padded to 16 bytes.
_ASSERTE(dwNumberOfBytesTransfered >= offsetof(FILE_NOTIFY_INFORMATION, FileName) + sizeof(WCHAR));
pBlock->BackupBuffer(dwNumberOfBytesTransfered);
// Get the new read issued as fast as possible. The documentation
// says that the original OVERLAPPED structure will not be used
// again once the completion routine is called.
pBlock->BeginRead();
//pBlock->ProcessNotification();
pBlock->m_pServer->m_pBase->Notify(pBlock->GetDirectory());
}
void CReadChangesRequest::ProcessNotification()
{
BYTE* pBase = m_BackupBuffer.data();
for (;;)
{
FILE_NOTIFY_INFORMATION& fni = (FILE_NOTIFY_INFORMATION&)*pBase;
wstring wstrFilename(fni.FileName, fni.FileNameLength/sizeof(wchar_t));
// Handle a trailing backslash, such as for a root directory.
if (m_wstrDirectory.back() != L'\\')
wstrFilename = m_wstrDirectory + L"\\" + wstrFilename;
else
wstrFilename = m_wstrDirectory + wstrFilename;
// If it could be a short filename, expand it.
LPCWSTR wszFilename = PathFindFileNameW(wstrFilename.c_str());
int len = lstrlenW(wszFilename);
// The maximum length of an 8.3 filename is twelve, including the dot.
if (len <= 12 && wcschr(wszFilename, L'~'))
{
// Convert to the long filename form. Unfortunately, this
// does not work for deletions, so it's an imperfect fix.
wchar_t wbuf[MAX_PATH];
if (::GetLongPathNameW(wstrFilename.c_str(), wbuf, _countof(wbuf)) > 0)
wstrFilename = wbuf;
}
//m_pServer->m_pBase->Push(fni.Action, wstrFilename);
if (!fni.NextEntryOffset)
break;
pBase += fni.NextEntryOffset;
};
}
}

212
SandboxiePlus/SandMan/Helpers/ReadDirectoryChangesPrivate.h Normal file
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//
// The MIT License
//
// Copyright (c) 2010 James E Beveridge
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// This sample code is for my blog entry titled, "Understanding ReadDirectoryChangesW"
// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
// See ReadMe.txt for overview information.
class CReadDirectoryChanges;
namespace ReadDirectoryChangesPrivate
{
class CReadChangesServer;
///////////////////////////////////////////////////////////////////////////
// All functions in CReadChangesRequest run in the context of the worker thread.
// One instance of this object is created for each call to AddDirectory().
class CReadChangesRequest
{
public:
CReadChangesRequest(CReadChangesServer* pServer, LPCTSTR sz, BOOL b, DWORD dw, DWORD size);
~CReadChangesRequest();
bool OpenDirectory();
void BeginRead();
// The dwSize is the actual number of bytes sent to the APC.
void BackupBuffer(DWORD dwSize)
{
// We could just swap back and forth between the two
// buffers, but this code is easier to understand and debug.
memcpy(&m_BackupBuffer[0], &m_Buffer[0], dwSize);
}
void ProcessNotification();
void RequestTermination()
{
// ::CancelIoEx(m_hDirectory, &m_Overlapped);
::CancelIo(m_hDirectory);
::CloseHandle(m_hDirectory);
m_hDirectory = nullptr;
}
const wstring& GetDirectory() { return m_wstrDirectory; }
CReadChangesServer* m_pServer;
protected:
static VOID CALLBACK NotificationCompletion(
DWORD dwErrorCode, // completion code
DWORD dwNumberOfBytesTransfered, // number of bytes transferred
LPOVERLAPPED lpOverlapped); // I/O information buffer
// Parameters from the caller for ReadDirectoryChangesW().
DWORD m_dwFilterFlags;
BOOL m_bIncludeChildren;
wstring m_wstrDirectory;
// Result of calling CreateFile().
HANDLE m_hDirectory;
// Required parameter for ReadDirectoryChangesW().
OVERLAPPED m_Overlapped;
// Data buffer for the request.
// Since the memory is allocated by malloc, it will always
// be aligned as required by ReadDirectoryChangesW().
vector<BYTE> m_Buffer;
// Double buffer strategy so that we can issue a new read
// request before we process the current buffer.
vector<BYTE> m_BackupBuffer;
};
///////////////////////////////////////////////////////////////////////////
// All functions in CReadChangesServer run in the context of the worker thread.
// One instance of this object is allocated for each instance of CReadDirectoryChanges.
// This class is responsible for thread startup, orderly thread shutdown, and shimming
// the various C++ member functions with C-style Win32 functions.
class CReadChangesServer
{
public:
CReadChangesServer(CReadDirectoryChanges* pParent)
{
m_bTerminate=false; m_nOutstandingRequests=0;m_pBase=pParent;
}
static unsigned int WINAPI ThreadStartProc(LPVOID arg)
{
CReadChangesServer* pServer = (CReadChangesServer*)arg;
pServer->Run();
return 0;
}
// Called by QueueUserAPC to start orderly shutdown.
static void CALLBACK TerminateProc(__in ULONG_PTR arg)
{
CReadChangesServer* pServer = (CReadChangesServer*)arg;
pServer->RequestTermination();
}
// Called by QueueUserAPC to add another directory.
static void CALLBACK AddDirectoryProc(__in ULONG_PTR arg)
{
CReadChangesRequest* pRequest = (CReadChangesRequest*)arg;
pRequest->m_pServer->AddDirectory(pRequest);
}
static void CALLBACK DetachDirectoryProc(__in ULONG_PTR arg)
{
pair<ReadDirectoryChangesPrivate::CReadChangesServer*, wstring>* pRequest = (pair<ReadDirectoryChangesPrivate::CReadChangesServer*, wstring>*)arg;
pRequest->first->DetachDirectory(pRequest);
}
CReadDirectoryChanges* m_pBase;
volatile DWORD m_nOutstandingRequests;
protected:
void Run()
{
while (m_nOutstandingRequests || !m_bTerminate)
{
DWORD rc = ::SleepEx(INFINITE, true);
}
}
void AddDirectory( CReadChangesRequest* pBlock )
{
for (auto I = m_pBlocks.begin(); I != m_pBlocks.end(); ++I)
{
if ((*I)->GetDirectory() == pBlock->GetDirectory())
{
delete pBlock;
return;
}
}
if (pBlock->OpenDirectory())
{
::InterlockedIncrement(&pBlock->m_pServer->m_nOutstandingRequests);
m_pBlocks.push_back(pBlock);
pBlock->BeginRead();
}
else
delete pBlock;
}
void DetachDirectory(pair<ReadDirectoryChangesPrivate::CReadChangesServer*, wstring>* pRequest)
{
for (auto I = m_pBlocks.begin(); I != m_pBlocks.end(); )
{
if ((*I)->GetDirectory() == pRequest->second)
{
::InterlockedDecrement(&pRequest->first->m_nOutstandingRequests);
(*I)->RequestTermination();
delete (*I);
I = m_pBlocks.erase(I);
}
else
++I;
}
delete pRequest;
}
void RequestTermination()
{
m_bTerminate = true;
for (DWORD i=0; i<m_pBlocks.size(); ++i)
{
// Each Request object will delete itself.
m_pBlocks[i]->RequestTermination();
}
m_pBlocks.clear();
}
vector<CReadChangesRequest*> m_pBlocks;
bool m_bTerminate;
};
}

122
SandboxiePlus/SandMan/Helpers/ThreadSafeQueue.h Normal file
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//
// The MIT License
//
// Copyright (c) 2010 James E Beveridge
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// This sample code is for my blog entry titled, "Understanding ReadDirectoryChangesW"
// http://qualapps.blogspot.com/2010/05/understanding-readdirectorychangesw.html
// See ReadMe.txt for overview information.
#include <list>
template <typename C>
class CThreadSafeQueue : protected std::list<C>
{
public:
CThreadSafeQueue(int nMaxCount)
{
m_bOverflow = false;
m_hSemaphore = ::CreateSemaphore(
NULL, // no security attributes
0, // initial count
nMaxCount, // max count
NULL); // anonymous
}
~CThreadSafeQueue()
{
::CloseHandle(m_hSemaphore);
m_hSemaphore = NULL;
}
void push(C& c)
{
//CComCritSecLock<CComAutoCriticalSection> lock( m_Crit, true );
QMutexLocker lock(&m_Mutex);
push_back( c );
//lock.Unlock();
lock.unlock();
if (!::ReleaseSemaphore(m_hSemaphore, 1, NULL))
{
// If the semaphore is full, then take back the entry.
//lock.Lock();
lock.relock();
pop_back();
if (GetLastError() == ERROR_TOO_MANY_POSTS)
{
m_bOverflow = true;
}
}
}
bool pop(C& c)
{
//CComCritSecLock<CComAutoCriticalSection> lock( m_Crit, true );
QMutexLocker lock(&m_Mutex);
// If the user calls pop() more than once after the
// semaphore is signaled, then the semaphore count will
// get out of sync. We fix that when the queue empties.
if (empty())
{
while (::WaitForSingleObject(m_hSemaphore, 0) != WAIT_TIMEOUT)
1;
return false;
}
c = front();
pop_front();
return true;
}
// If overflow, use this to clear the queue.
void clear()
{
//CComCritSecLock<CComAutoCriticalSection> lock( m_Crit, true );
QMutexLocker lock(&m_Mutex);
for (DWORD i=0; i<size(); i++)
WaitForSingleObject(m_hSemaphore, 0);
__super::clear();
m_bOverflow = false;
}
bool overflow()
{
return m_bOverflow;
}
HANDLE GetWaitHandle() { return m_hSemaphore; }
protected:
HANDLE m_hSemaphore;
//CComAutoCriticalSection m_Crit;
QMutex m_Mutex;
bool m_bOverflow;
};

4
SandboxiePlus/SandMan/SandMan.pri
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@ -17,6 +17,8 @@ HEADERS += ./stdafx.h \
./Dialogs/MultiErrorDialog.h \
./Helpers/FindTool.h \
./Helpers/WinAdmin.h \
./Helpers/ReadDirectoryChanges.h \
./Helpers/ReadDirectoryChangesPrivate.h \
./Windows/NewBoxWindow.h \
./Windows/RecoveryWindow.h \
./Windows/PopUpWindow.h \
@ -42,6 +44,8 @@ SOURCES += ./main.cpp \
./Dialogs/MultiErrorDialog.cpp \
./Helpers/FindTool.cpp \
./Helpers/WinAdmin.cpp \
./Helpers/ReadDirectoryChanges.cpp \
./Helpers/ReadDirectoryChangesPrivate.cpp \
./Helpers/WindowFromPointEx.cpp \
./Windows/NewBoxWindow.cpp \
./Windows/OptionsWindow.cpp \