Windows Socket I/O模型之 I/O完成端口

# include < winsock2. h>
# include < ws2tcpip. h>
# include < mswsock. h>
# include < windows. h>
# include "resolve.h"
# include "public.h"
# define DEFAULT_OVERLAPPED_COUNT 5
# define MAX_COMPLETION_THREAD_COUNT 32 // Maximum number of completion threads allowed
typedef SINGLE_LIST_HEADER SocketObjHeader;
typedef SINGLE_LIST SocketObj;
typedef DOUBLE_LIST_HEADER BufferObjHeader;
typedef DOUBLE_LIST BufferObj;
int gOverlappedCount = DEFAULT_OVERLAPPED_COUNT;
typedef struct _BUFFER_OBJ_EX {
WSAOVERLAPPED ol; // Overlapped structure
SOCKET sclient; // Used for AcceptEx client socket
char * buf; // Buffer for send/recv/AcceptEx
int buflen; // Length of the buffer
int operation; // Type of operation submitted
# define OP_ACCEPT 0 // AcceptEx
# define OP_READ 1 // WSARecv/WSARecvFrom
# define OP_WRITE 2 // WSASend?WSASendTo
SOCKADDR_STORAGE addr; // Remote address (UDP)
int addrlen; // Remote address length
ULONG IoOrder; // Order in which this I/O was posted
BufferObj bufDList;
} BUFFER_OBJ_EX;
typedef struct _SOCKET_OBJ
{
SOCKET s; // Socket handle for client connection
int af, // Address family of socket (AF_INET or AF_INET6)
bClosing; // Indicates socket is closing
volatile LONG OutstandingOps; // Number of outstanding overlapped ops
BUFFER_OBJ_EX * * PendingAccepts; // Array of pending AcceptEx calls (listening socket only)
ULONG LastSendIssued, // Last sequence number sent
IoCountIssued; // Next sequence number assigned to receives
BufferObjHeader OutOfOrderSends; // List of send buffers that completed out of order
// Pointers to Microsoft specific extensions (listening socket only)
LPFN_ACCEPTEX lpfnAcceptEx;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockaddrs;
CRITICAL_SECTION SockCritSec; // Synchronize access to this SOCKET_OBJ
SocketObj next; // Used to chain SOCKET_OBJ together
} SOCKET_OBJ;
SOCKET_OBJ * GetSocketObj( SOCKET s, int af)
{
SOCKET_OBJ * sockobj= NULL ;
sockobj = ( SOCKET_OBJ * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( SOCKET_OBJ) ) ;
if ( sockobj = = NULL )
{
fprintf ( stderr , "GetSocketObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
InitializeCriticalSection( & sockobj- > SockCritSec) ;
InitializeDoubleHead( & sockobj- > OutOfOrderSends) ;
sockobj- > IoCountIssued = ( ( gProtocol = = IPPROTO_TCP ) ? 1 : 0) ;
// Initialize the members
sockobj- > s = s;
sockobj- > af = af;
return sockobj;
}
BUFFER_OBJ_EX * GetBufferObjEx( int buflen)
{
BUFFER_OBJ_EX * newobj= NULL ;
// Allocate the object
newobj = ( BUFFER_OBJ_EX * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( BUFFER_OBJ_EX) ) ;
if ( newobj = = NULL ) {
printf ( "GetBufferObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
// Allocate the buffer
newobj- > buf = ( char * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( BYTE) * buflen) ;
if ( newobj- > buf = = NULL ) {
printf ( "GetBufferObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
newobj- > buflen = buflen;
newobj- > addrlen = sizeof ( newobj- > addr) ;
return newobj;
}
void FreeBufferObjEx( BUFFER_OBJ_EX * obj)
{
HeapFree( GetProcessHeap( ) , 0, obj- > buf) ;
HeapFree( GetProcessHeap( ) , 0, obj) ;
}
void FreeSocketObj( SOCKET_OBJ * obj)
{
BUFFER_OBJ_EX * ptr= NULL ,
* tmp= NULL ;
if ( obj- > OutstandingOps ! = 0)
{
// Still outstanding operations so just return
return ;
}
// Close the socket if it hasn't already been closed
if ( obj- > s ! = INVALID_SOCKET)
{
closesocket( obj- > s) ;
obj- > s = INVALID_SOCKET;
}
DeleteCriticalSection( & obj- > SockCritSec) ;
HeapFree( GetProcessHeap( ) , 0, obj) ;
}
void InsertPendingSend( SOCKET_OBJ * sock, BUFFER_OBJ_EX * send )
{
BufferObj * ptr = NULL ;
BUFFER_OBJ_EX * obj = NULL ;
EnterCriticalSection( & sock- > SockCritSec) ;
ptr = ( BufferObj * ) GotoNextDoubleList( & sock- > OutOfOrderSends, & sock- > OutOfOrderSends. head) ;
while ( ptr)
{
obj = ( BUFFER_OBJ_EX * ) container_of( BUFFER_OBJ_EX, bufDList, ptr) ;
if ( send - > IoOrder < obj- > IoOrder)
{
break ;
}
ptr = ( BufferObj * ) GotoNextDoubleList( & sock- > OutOfOrderSends, ptr) ;
}
if ( ptr = = NULL )
ptr = & sock- > OutOfOrderSends. head;
EnqueueDoubleListBefore( & sock- > OutOfOrderSends, ptr, & send - > bufDList) ;
LeaveCriticalSection( & sock- > SockCritSec) ;
}
int PostRecv( SOCKET_OBJ * sock, BUFFER_OBJ_EX * recvobj)
{
WSABUF wbuf;
DWORD bytes,
flags;
int rc;
recvobj- > operation = OP_READ;
wbuf. buf = recvobj- > buf;
wbuf. len = recvobj- > buflen;
flags = 0;
EnterCriticalSection( & sock- > SockCritSec) ;
// Assign the IO order to this receive. This must be performned within
// the critical section. The operation of assigning the IO count and posting
// the receive cannot be interupted.
recvobj- > IoOrder = sock- > IoCountIssued;
sock- > IoCountIssued+ + ;
if ( gProtocol = = IPPROTO_TCP )
{
rc = WSARecv(
sock- > s,
& wbuf,
1,
& bytes,
& flags,
& recvobj- > ol,
NULL
) ;
}
else
{
ExitProcess( - 1) ;
}
LeaveCriticalSection( & sock- > SockCritSec) ;
if ( rc = = SOCKET_ERROR)
{
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostRecv: WSARecv* failed: %d/n" , WSAGetLastError( ) ) ;
return SOCKET_ERROR;
}
}
// Increment outstanding overlapped operations
InterlockedIncrement( & sock- > OutstandingOps) ;
return NO_ERROR;
}
int sendnum = 0;
int PostSend( SOCKET_OBJ * sock, BUFFER_OBJ_EX * sendobj)
{
WSABUF wbuf;
DWORD bytes;
int rc;
sendobj- > operation = OP_WRITE;
wbuf. buf = sendobj- > buf;
wbuf. len = sendobj- > buflen;
EnterCriticalSection( & sock- > SockCritSec) ;
// Incrmenting the last send issued and issuing the send should not be
// interuptable.
sock- > LastSendIssued+ + ;
if ( gProtocol = = IPPROTO_TCP )
{
printf ( "send %d/n" , sendnum+ + ) ;
rc = WSASend(
sock- > s,
& wbuf,
1,
& bytes,
0,
& sendobj- > ol,
NULL
) ;
}
else {
ExitProcess( - 1) ;
}
LeaveCriticalSection( & sock- > SockCritSec) ;
if ( rc = = SOCKET_ERROR)
{
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostSend: WSASend* failed: %d/n" , WSAGetLastError( ) ) ;
return SOCKET_ERROR;
}
}
// Increment the outstanding operation count
InterlockedIncrement( & sock- > OutstandingOps) ;
return NO_ERROR;
}
int PostAccept( SOCKET_OBJ * sock, BUFFER_OBJ_EX * acceptobj)
{
DWORD bytes;
int rc;
acceptobj- > operation = OP_ACCEPT;
// Create the client socket for an incoming connection
acceptobj- > sclient = socket ( sock- > af, SOCK_STREAM , IPPROTO_TCP ) ;
if ( acceptobj- > sclient = = INVALID_SOCKET)
{
fprintf ( stderr , "PostAccept: socket failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
rc = sock- > lpfnAcceptEx(
sock- > s,
acceptobj- > sclient,
acceptobj- > buf,
acceptobj- > buflen - ( ( sizeof ( SOCKADDR_STORAGE) + 16) * 2) ,
sizeof ( SOCKADDR_STORAGE) + 16,
sizeof ( SOCKADDR_STORAGE) + 16,
& bytes,
& acceptobj- > ol
) ;
if ( rc = = FALSE )
{
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostAccept: AcceptEx failed: %d/n" , WSAGetLastError( ) ) ;
return SOCKET_ERROR;
}
}
// Increment the outstanding overlapped count for this socket
InterlockedIncrement( & sock- > OutstandingOps) ;
return NO_ERROR;
}
int DoSends( SOCKET_OBJ * sock)
{
BufferObj * ptr = NULL ;
BufferObj * tmp = NULL ;
BUFFER_OBJ_EX * sendobj = NULL ;
int ret;
ret = NO_ERROR;
EnterCriticalSection( & sock- > SockCritSec) ;
ptr = ( BufferObj * ) GotoNextDoubleList( & sock- > OutOfOrderSends, & sock- > OutOfOrderSends. head) ;
while ( ptr) {
sendobj = ( BUFFER_OBJ_EX * ) container_of( BUFFER_OBJ_EX, bufDList, ptr) ;
if ( ( sendobj) & & ( sendobj- > IoOrder = = sock- > LastSendIssued) )
{
if ( PostSend( sock, sendobj) ! = NO_ERROR)
{
FreeBufferObjEx( sendobj) ;
ret = SOCKET_ERROR;
break ;
}
} else
break ;
tmp = ptr;
ptr = ( BufferObj * ) GotoNextDoubleList( & sock- > OutOfOrderSends, ptr) ;
RemoveDoubleList( & sock- > OutOfOrderSends, tmp) ;
//FreeBufferObjEx(sendobj);
}
LeaveCriticalSection( & sock- > SockCritSec) ;
return ret;
}
int handleNum = 0;
int handlecut = 0;
void HandleIo( SOCKET_OBJ * sock, BUFFER_OBJ_EX * buf, HANDLE CompPort, DWORD BytesTransfered, DWORD error ) {
SOCKET_OBJ * clientobj= NULL ; // New client object for accepted connections
BUFFER_OBJ_EX * recvobj= NULL , // Used to post new receives on accepted connections
* sendobj= NULL ; // Used to post new sends for data received
BOOL bCleanupSocket;
char * tmp;
int i;
bCleanupSocket = FALSE ;
if ( ( error ! = NO_ERROR) & & ( gProtocol = = IPPROTO_TCP ) ) {
FreeBufferObjEx( buf) ;
if ( InterlockedDecrement( & sock- > OutstandingOps) = = 0) {
FreeSocketObj( sock) ;
}
return ;
}
EnterCriticalSection( & sock- > SockCritSec) ;
if ( buf- > operation = = OP_ACCEPT) {
HANDLE hrc;
SOCKADDR_STORAGE * LocalSockaddr= NULL ,
* RemoteSockaddr= NULL ;
int LocalSockaddrLen,
RemoteSockaddrLen;
sock- > lpfnGetAcceptExSockaddrs(
buf- > buf, buf- > buflen - ( ( sizeof ( SOCKADDR_STORAGE) + 16) * 2) ,
sizeof ( SOCKADDR_STORAGE) + 16, sizeof ( SOCKADDR_STORAGE) + 16,
( SOCKADDR * * ) & LocalSockaddr, & LocalSockaddrLen,
( SOCKADDR * * ) & RemoteSockaddr, & RemoteSockaddrLen) ;
clientobj = GetSocketObj( buf- > sclient, sock- > af) ;
hrc = CreateIoCompletionPort( ( HANDLE) buf- > sclient, CompPort, ( ULONG_PTR) clientobj, 0) ;
if ( hrc = = NULL ) {
fprintf ( stderr , "CompletionThread: CreateIoCompletionPort failed: %d/n" , GetLastError( ) ) ;
return ;
}
sendobj = GetBufferObjEx( BytesTransfered) ;
memcpy ( sendobj- > buf, buf- > buf, BytesTransfered) ;
if ( PostSend( clientobj, sendobj) = = NO_ERROR)
{
// Now post some receives on this new connection
for ( i = 0; i < gOverlappedCount; i+ + )
{
recvobj = GetBufferObjEx( gBufferSize) ;
if ( PostRecv( clientobj, recvobj) ! = NO_ERROR)
{
FreeBufferObjEx( recvobj) ;
error = SOCKET_ERROR;
break ;
}
}
}
else
{
FreeBufferObjEx( sendobj) ;
error = SOCKET_ERROR;
}
PostAccept( sock, buf) ;
if ( error ! = NO_ERROR)
{
if ( clientobj- > OutstandingOps = = 0)
{
closesocket( clientobj- > s) ;
clientobj- > s = INVALID_SOCKET;
FreeSocketObj( clientobj) ;
}
else
{
clientobj- > bClosing = TRUE ;
}
error = NO_ERROR;
}
} else if ( ( buf- > operation = = OP_READ) & & ( error = = NO_ERROR) ) {
if ( ( BytesTransfered > 0) )
{
printf ( "HandleIo: %d/n" , handleNum+ + ) ;
// Create a buffer to send
sendobj = GetBufferObjEx( gBufferSize) ;
printf ( "handlecut %d./n" , handlecut+ + ) ;
// Swap the buffers (i.e. buffer we just received becomes the send buffer)
tmp = sendobj- > buf;
sendobj- > buflen = BytesTransfered;
sendobj- > buf = buf- > buf;
sendobj- > IoOrder = buf- > IoOrder;
buf- > buf = tmp;
buf- > buflen = gBufferSize;
InsertPendingSend( sock, sendobj) ;
if ( DoSends( sock) ! = NO_ERROR)
{
error = SOCKET_ERROR;
printf ( "SOCKET_ERROR./n" ) ;
}
else
{
// Post another receive
if ( PostRecv( sock, buf) ! = NO_ERROR)
{
// In the event the recv fails, clean up the connection
FreeBufferObjEx( buf) ;
error = SOCKET_ERROR;
printf ( "SOCKET_ERROR./n" ) ;
}
}
}
else
{
sock- > bClosing = TRUE ;
// Free the receive buffer
FreeBufferObjEx( buf) ;
if ( DoSends( sock) ! = NO_ERROR)
{
error = SOCKET_ERROR;
printf ( "SOCKET_ERROR./n" ) ;
}
// If this was the last outstanding operation on socket, clean it up
if ( ( sock- > OutstandingOps = = 0) & & ( sock- > OutOfOrderSends. count = = 0) )
{
bCleanupSocket = TRUE ;
}
}
} else if ( buf- > operation = = OP_WRITE) {
FreeBufferObjEx( buf) ;
if ( DoSends( sock) ! = NO_ERROR)
{
error = SOCKET_ERROR;
}
}
if ( error ! = NO_ERROR) {
sock- > bClosing = TRUE ;
}
if ( ( InterlockedDecrement( & sock- > OutstandingOps) = = 0) & & ( sock- > bClosing) & & ( sock- > OutOfOrderSends. count = = 0) ) {
bCleanupSocket = TRUE ;
} else {
if ( DoSends( sock) ! = NO_ERROR) {
bCleanupSocket = TRUE ;
}
}
LeaveCriticalSection( & sock- > SockCritSec) ;
if ( bCleanupSocket)
{
closesocket( sock- > s) ;
sock- > s = INVALID_SOCKET;
FreeSocketObj( sock) ;
}
}
int iocpNum = 0;
DWORD WINAPI CompletionThread( LPVOID lpParam) {
SOCKET_OBJ * sockobj= NULL ; // Per socket object for completed I/O
BUFFER_OBJ_EX * bufobj= NULL ; // Per I/O object for completed I/O
OVERLAPPED * lpOverlapped= NULL ; // Pointer to overlapped structure for completed I/O
HANDLE CompletionPort; // Completion port handle
DWORD BytesTransfered, // Number of bytes transfered
Flags; // Flags for completed I/O
int rc,
error ;
CompletionPort = ( HANDLE) lpParam;
while ( true ) {
error = NO_ERROR;
rc = GetQueuedCompletionStatus( CompletionPort, & BytesTransfered, ( PULONG_PTR) & sockobj, & lpOverlapped, INFINITE) ;
printf ( "iocp %d./n" , iocpNum+ + ) ;
bufobj = CONTAINING_RECORD( lpOverlapped, BUFFER_OBJ_EX, ol) ;
if ( rc = = FALSE )
{
printf ( "false./n" ) ;
rc = WSAGetOverlappedResult( sockobj- > s, & bufobj- > ol, & BytesTransfered, FALSE , & Flags) ;
if ( rc = = FALSE )
{
error = WSAGetLastError( ) ;
printf ( "WSAGetOverlappedResult failed %d./n" , error ) ;
}
}
HandleIo( sockobj, bufobj, CompletionPort, BytesTransfered, error ) ;
}
ExitProcess( 0) ;
return 0;
}
int _tmain( int argc, _TCHAR* argv[ ] )
{
WSADATA wsd;
SYSTEM_INFO sysinfo;
SOCKET_OBJ * sockobj= NULL ;
SocketObjHeader ListenSockets;
HANDLE CompletionPort,
CompThreads[ MAX_COMPLETION_THREAD_COUNT] ,
hrc;
int endpointcount= 0,
interval,
rc,
i;
struct addrinfo * res= NULL ,
* ptr= NULL ;
if ( WSAStartup( MAKEWORD( 2, 2) , & wsd) ! = 0)
{
fprintf ( stderr , "unable to load Winsock!/n" ) ;
return - 1;
}
CompletionPort = CreateIoCompletionPort( INVALID_HANDLE_VALUE, NULL , NULL , 0) ;
if ( CompletionPort = = NULL ) {
fprintf ( stderr , "CreateIoCompletionPort failed./n" ) ;
return 0;
}
GetSystemInfo( & sysinfo) ;
if ( sysinfo. dwNumberOfProcessors > MAX_COMPLETION_THREAD_COUNT) {
sysinfo. dwNumberOfProcessors = MAX_COMPLETION_THREAD_COUNT;
}
//for (i = 0; i < sysinfo.dwNumberOfProcessors; ++i) {
for ( i = 0; i < 1; + + i) {
CompThreads[ i] = CreateThread( NULL , 0, CompletionThread, ( LPVOID) CompletionPort, 0, NULL ) ;
if ( CompThreads[ i] = = NULL ) {
fprintf ( stderr , "CreateThread failed./n" ) ;
return - 1;
}
}
res = ResolveAddress( gSrvAddr, gPort, gAddressFamily, gSocketType, gProtocol) ;
if ( res = = NULL )
{
fprintf ( stderr , "ResolveAddress failed to return any addresses!/n" ) ;
return - 1;
}
InitializeSingleHead( & ListenSockets) ;
ptr = res;
while ( ptr) {
sockobj = GetSocketObj( INVALID_SOCKET, ptr- > ai_family) ;
sockobj- > s = socket ( ptr- > ai_family, ptr- > ai_socktype, ptr- > ai_protocol) ;
if ( sockobj- > s = = INVALID_SOCKET)
{
fprintf ( stderr , "socket failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
hrc = CreateIoCompletionPort( ( HANDLE) sockobj- > s, CompletionPort, ( ULONG_PTR) sockobj, 0) ;
if ( hrc = = NULL )
{
fprintf ( stderr , "CreateIoCompletionPort failed: %d/n" , GetLastError( ) ) ;
return - 1;
}
rc = bind ( sockobj- > s, ptr- > ai_addr, ptr- > ai_addrlen) ;
if ( rc = = SOCKET_ERROR) {
fprintf ( stderr , "bind failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
if ( gProtocol = = IPPROTO_TCP ) {
BUFFER_OBJ_EX * acceptobj= NULL ;
GUID guidAcceptEx = WSAID_ACCEPTEX,
guidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
DWORD bytes;
// Need to load the Winsock extension functions from each provider
// -- e.g. AF_INET and AF_INET6.
rc = WSAIoctl( sockobj- > s, SIO_GET_EXTENSION_FUNCTION_POINTER, & guidAcceptEx, sizeof ( guidAcceptEx) ,
& sockobj- > lpfnAcceptEx, sizeof ( sockobj- > lpfnAcceptEx) , & bytes, NULL , NULL ) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "WSAIoctl: SIO_GET_EXTENSION_FUNCTION_POINTER failed: %d/n" ,
WSAGetLastError( ) ) ;
return - 1;
}
rc = WSAIoctl( sockobj- > s, SIO_GET_EXTENSION_FUNCTION_POINTER, & guidGetAcceptExSockaddrs, sizeof ( guidGetAcceptExSockaddrs) ,
& sockobj- > lpfnGetAcceptExSockaddrs, sizeof ( sockobj- > lpfnGetAcceptExSockaddrs) , & bytes, NULL , NULL ) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "WSAIoctl: SIO_GET_EXTENSION_FUNCTION_POINTER faled: %d/n" ,
WSAGetLastError( ) ) ;
return - 1;
}
rc = listen ( sockobj- > s, 100) ;
if ( rc = = SOCKET_ERROR) {
fprintf ( stderr , "listen failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
sockobj- > PendingAccepts = ( BUFFER_OBJ_EX * * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, ( sizeof ( BUFFER_OBJ_EX * ) * gOverlappedCount) ) ;
if ( sockobj- > PendingAccepts = = NULL )
{
fprintf ( stderr , "HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
for ( i= 0; i < gOverlappedCount ; i+ + )
{
sockobj- > PendingAccepts[ i] = acceptobj = GetBufferObjEx( gBufferSize) ;
PostAccept( sockobj, acceptobj) ;
}
EnqueueSingleList( & ListenSockets, & ( sockobj- > next) ) ;
}
ptr = ptr- > ai_next;
}
freeaddrinfo ( res) ;
interval = 0;
while ( true ) {
rc = WSAWaitForMultipleEvents( 1, CompThreads, TRUE , 5000, FALSE ) ;
if ( rc = = WAIT_FAILED) {
fprintf ( stderr , "WSAWaitForMultipleEvents failed: %d/n" , WSAGetLastError( ) ) ;
break ;
} else if ( rc = = WAIT_TIMEOUT) {
interval+ + ;
if ( interval = = 12) {
SocketObj * listenptr= NULL ;
int optval,
optlen;
// Walk the list of outstanding accepts
listenptr = ( SocketObj * ) GotoNextSingleList( & ListenSockets, ListenSockets. head) ;
while ( listenptr)
{
sockobj = ( SOCKET_OBJ * ) container_of( SOCKET_OBJ, next, listenptr) ;
for ( i= 0; i < gOverlappedCount ; i+ + )
{
optlen = sizeof ( optval) ;
rc = getsockopt (
sockobj- > PendingAccepts[ i] - > sclient,
SOL_SOCKET,
SO_CONNECT_TIME,
( char * ) & optval,
& optlen
) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "getsockopt: SO_CONNECT_TIME failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
if ( ( optval ! = 0xFFFFFFFF) & & ( optval > 300) )
{
closesocket( sockobj- > PendingAccepts[ i] - > sclient) ;
}
}
listenptr = ( SocketObj * ) GotoNextSingleList( & ListenSockets, listenptr) ;
}
interval = 0;
}
}
}
WSACleanup( ) ;
return 0;
}

Windows Socket I/O模型之 I/O完成端口

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