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Posted on 2009-09-18 22:33 S.l.e!ep.¢% 阅读(627) 评论(0) 编辑 收藏 引用 所属分类: IOCP
ICOP可以这么简单?
class
CIOCompletionPort

{
public
:
explicit
CIOCompletionPort(size_t maxConcurrency);
~
CIOCompletionPort();

void
AssociateDevice(HANDLE hDevice, ULONG_PTR completionKey);

void
PostStatus(ULONG_PTR completionKey, DWORD dwNumBytes
=
0
, OVERLAPPED
*
pOverlapped
=
0
);

void
GetStatus(ULONG_PTR
*
pCompletionKey, PDWORD pdwNumBytes, OVERLAPPED
**
ppOverlapped);

bool
GetStatus(ULONG_PTR
*
pCompletionKey, PDWORD pdwNumBytes, OVERLAPPED
**
ppOverlapped, DWORD dwMilliseconds);

private
:
HANDLE m_iocp;

//
No copies do not implement
CIOCompletionPort(
const
CIOCompletionPort
&
rhs);
CIOCompletionPort
&
operator
=
(
const
CIOCompletionPort
&
rhs);
}
;
CIOCompletionPort::CIOCompletionPort(
size_t maxConcurrency)
: m_iocp(::CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL,
0
, maxConcurrency))

{
if
(m_iocp
==
0
)

{
throw
CWin32Exception(_T(
"
CIOCompletionPort::CIOCompletionPort() - CreateIoCompletionPort
"
), ::GetLastError());
}
}
CIOCompletionPort::
~
CIOCompletionPort()

{
::CloseHandle(m_iocp);
}
void
CIOCompletionPort::AssociateDevice(
HANDLE hDevice,
ULONG_PTR completionKey)

{
if
(m_iocp
!=
::CreateIoCompletionPort(hDevice, m_iocp, completionKey,
0
))

{
throw
CWin32Exception(_T(
"
CIOCompletionPort::AssociateDevice() - CreateIoCompletionPort
"
), ::GetLastError());
}
}
void
CIOCompletionPort::PostStatus(
ULONG_PTR completionKey,
 DWORD dwNumBytes
/**/
/*
= 0
*/
,
 OVERLAPPED
*
pOverlapped
/**/
/*
= 0
*/
)

{
if
(
0
==
::PostQueuedCompletionStatus(m_iocp, dwNumBytes, completionKey, pOverlapped))

{
throw
CWin32Exception(_T(
"
CIOCompletionPort::PostStatus() - PostQueuedCompletionStatus
"
), ::GetLastError());
}
}
void
CIOCompletionPort::GetStatus(
ULONG_PTR
*
pCompletionKey,
PDWORD pdwNumBytes,
OVERLAPPED
**
ppOverlapped)

{
if
(
0
==
::GetQueuedCompletionStatus(m_iocp, pdwNumBytes, pCompletionKey, ppOverlapped, INFINITE))

{
throw
CWin32Exception(_T(
"
CIOCompletionPort::GetStatus() - GetQueuedCompletionStatus
"
), ::GetLastError());
}
}
bool
CIOCompletionPort::GetStatus(
ULONG_PTR
*
pCompletionKey,
PDWORD pdwNumBytes,
OVERLAPPED
**
ppOverlapped,
DWORD dwMilliseconds)

{
bool
ok
=
true
;

if
(
0
==
::GetQueuedCompletionStatus(m_iocp, pdwNumBytes, pCompletionKey, ppOverlapped, dwMilliseconds))

{
DWORD lastError
=
::GetLastError();

if
(lastError
!=
WAIT_TIMEOUT)

{
throw
CWin32Exception(_T(
"
CIOCompletionPort::GetStatus() - GetQueuedCompletionStatus
"
), lastError);
}
ok
=
false
;
}
return
ok;
}
SURE,IOCP 在WINDOWS下是一种机制,一种高效的IO访问机制,‘IO’不仅仅只限于网络,这样就变得简单多了!
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