实验过程：
1. 首先线程A在socket 1上投递WSARecv接收请求等待数据到来、PER_IO_DATA编号1，
2. 然后线程B在socket 1上投递WSARecv接收请求且编号2，
3. 线程A在socket 1上两次投递WSARecv接收请求，编号3、4,
4. Client发送数据，由编号1的WSARecv收到数据，
5. 线程B在socket 1上两次投递WSASend发送请求，
6. Client正确收到5中发送的数据，
7. Client发送数据给IOCP Server，
8. 编号2的WSARecv收到数据
实验结果：
1.在同一socket上同时投递多个WSARecv、同时投递WSARecv和WSASend，
WSARecv与WSARecv之间、WSARecv和WSASend之间互不干扰，
当有数据到来时，多个WSARecv以投递顺序决定接收顺序，即谁最先调用WSARecv，到来的数据归谁
2.Client正常closesocket或直接退出，在socket 1上投递的所有WSARecv均返回
实验结果图：
实验代码：
#include <WinSock2.h>
#include <Windows.h>
#include <iostream>
#include <process.h>
#include <string>
#include <MSWSock.h>
#include <set>
#include "autoLock.h"
#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib, "Kernel32.lib")
#pragma comment(lib, "Mswsock.lib")
#define BUF_LEN 1024
enum OperateType
{
OP_RECV,
OP_SEND,
OP_ACCEPT,
};
typedef struct PER_HANDLE_DATA
{
SOCKET s;
SOCKADDR_IN addr;
/*参考性添加, 防止重复delete PER_HANDLE_DATA, 目前没有找到更好的办法*/
HANDLE mutex;
bool flag;
}PER_HANDLE_DATA, *LPPER_HANDLE_DATA;
typedef struct PER_IO_DATA
{
OVERLAPPED overlapped;
SOCKET cs;
int no;
char buf[BUF_LEN];
int operationType;
}PER_IO_DATA, *LPPER_IO_DATA;
SOCKET SocketInitBindListen()
{
SOCKET s = socket(AF_INET, SOCK_STREAM, 0);
if(INVALID_SOCKET == s)
{
std::cout<<"create socket failed : "<<GetLastError()<<std::endl;
return INVALID_SOCKET;
}
SOCKADDR_IN addr;
addr.sin_family = AF_INET;
addr.sin_addr.S_un.S_addr = INADDR_ANY;
addr.sin_port = htons(4444);
int ret = bind(s, (sockaddr*)&addr, sizeof(addr));
if(SOCKET_ERROR == ret)
{
std::cout<<"bind failed : "<<GetLastError()<<std::endl;
return SOCKET_ERROR;
}
ret = listen(s, 10);
if(SOCKET_ERROR == s)
{
std::cout<<"listen fail : "<<GetLastError()<<std::endl;
return SOCKET_ERROR;
}
return s;
}
bool PostAccept(SOCKET listenSocket)
{
SOCKET cs = socket(AF_INET, SOCK_STREAM, 0);
if(INVALID_SOCKET == cs)
{
std::cout<<"Create Socket Failed : "<<GetLastError()<<std::endl;
return false;
}
LPPER_IO_DATA ppiod = new PER_IO_DATA;
ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));
ppiod->operationType = OP_ACCEPT;
ppiod->cs = cs;
DWORD dwRecv;
int len = sizeof(sockaddr_in) + 16;
bool ret = AcceptEx(listenSocket, ppiod->cs, ppiod->buf, 0, len, len, &dwRecv, &ppiod->overlapped);
if(false == ret && ERROR_IO_PENDING != GetLastError())
{
std::cout<<"AcceptEx Failed : "<<GetLastError()<<std::endl;
return false;
}
return true;
}
bool PostSend(SOCKET s, const char *buf, int len)
{
LPPER_IO_DATA ppiod = new PER_IO_DATA;
ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));
ppiod->operationType = OP_SEND;
memset(ppiod->buf, 0, BUF_LEN);
memcpy(ppiod->buf, buf, len);
WSABUF databuf;
databuf.buf = ppiod->buf;
databuf.len = len;
DWORD dwRecv = 0;
DWORD dwFlags = 0;
int ret = WSASend(s, &databuf, 1, &dwRecv, dwFlags, &ppiod->overlapped, NULL);
if(SOCKET_ERROR == ret && WSA_IO_PENDING != GetLastError())
return false;
return true;
}
bool PostRecv(SOCKET s, int n)
{
LPPER_IO_DATA ppiod = new PER_IO_DATA;
ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));
ppiod->operationType = OP_RECV;
ppiod->no = n;
memset(ppiod->buf, 0, BUF_LEN);
WSABUF databuf;
databuf.buf = ppiod->buf;
databuf.len = BUF_LEN;
DWORD dwRecv = 0;
DWORD dwFlags = 0;
int ret = WSARecv(s, &databuf, 1, &dwRecv, &dwFlags, &ppiod->overlapped, NULL);
if(SOCKET_ERROR == ret && WSA_IO_PENDING != GetLastError())
return false;
return true;
}
unsigned int __stdcall Func(void *arg)
{
SOCKET s = (SOCKET)arg;
PostRecv(s, 2);
while(std::cin.get())
{
std::string str = "nihaihaoma";
bool ret = PostSend(s, str.c_str(), str.length());
if(false == ret)
break;
}
_endthreadex(0);
return 0;
}
unsigned int __stdcall ThreadFunc(void *arg)
{
HANDLE hcp = (HANDLE)arg;
if(NULL == hcp)
{
std::cout<<"thread arg error"<<std::endl;
return -1;
}
DWORD dwNum = 0;
LPPER_HANDLE_DATA pphd;
LPPER_IO_DATA ppiod;
while(true)
{
bool ret = GetQueuedCompletionStatus(hcp, &dwNum, (LPDWORD)&pphd, (LPOVERLAPPED*)&ppiod, WSA_INFINITE);
//线程退出控制，没有释放申请的堆空间，还不完善
if(-1 == dwNum)
{
std::cout<<"Thread Exit"<<std::endl;
_endthreadex(0);
return 0;
}
//连接断开
int type = ppiod->operationType;
if(0 == dwNum && OP_ACCEPT != type)
{
std::cout<<"The Connection Be Closed : "<<GetLastError()<<std::endl;
//在一个socket上投递多个WSARecv需要考虑连接被Client断开时所有异步WSARecv均返回不会重复delete PER_HANDLE_DATA
AutoLock lock(pphd->mutex);
if(true == pphd->flag)
{
closesocket(pphd->s);
delete pphd; //这里有错：都delete了，怎么还能用pphd->flag?而且pphd->mutex被自动锁使用，不能轻易delete
pphd->flag = false;
}
delete ppiod;
continue;
}
//错误发生
if(false == ret)
{
std::cout<<"An Error Occurs : "<<GetLastError()<<std::endl;
if(pphd != NULL)
{
closesocket(pphd->s);
delete pphd;
}
delete ppiod;
continue;
}
if(OP_RECV == type)
{
//
std::cout<<"接收完成"<<std::endl;
std::cout<<"接收端口号 ："<<pphd->s<<std::endl;
//
ppiod->buf[dwNum] = ' ';
std::cout<<"Receiver : "<<ppiod->no<<" "<<ppiod->buf<<std::endl;
ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));
ZeroMemory(ppiod->buf, BUF_LEN);
WSABUF databuf;
databuf.buf = ppiod->buf;
databuf.len = BUF_LEN;
DWORD dwRecv = 0;
DWORD dwFlags = 0;
WSARecv(pphd->s, &databuf, 1, &dwRecv, &dwFlags, &ppiod->overlapped, NULL);
}
else if(OP_SEND == type)
{
//
std::cout<<"发送完成"<<std::endl;
std::cout<<"完成发送的端口号 : "<<pphd->s<<std::endl;
//
delete ppiod;
}
else if(OP_ACCEPT == type)
{
//
std::cout<<"连接完成"<<std::endl;
//
SOCKET cs = ppiod->cs;
int len = sizeof(sockaddr_in) + 16;
int localLen, remoteLen;
LPSOCKADDR localAddr, remoteAddr;
GetAcceptExSockaddrs(ppiod->buf, 0, len, len, (SOCKADDR **)&localAddr, &localLen, (SOCKADDR **)&remoteAddr, &remoteLen);
LPPER_HANDLE_DATA p = new PER_HANDLE_DATA;
p->s = cs;
memcpy(&p->addr, remoteAddr, remoteLen);
char *ch = inet_ntoa(p->addr.sin_addr);
p->mutex = CreateMutex(NULL, false, NULL);
p->flag = true;
CreateIoCompletionPort((HANDLE)cs, hcp, (DWORD)p, 0);
ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));
ppiod->operationType = OP_RECV;
ppiod->no = 1;
WSABUF databuf;
databuf.buf = ppiod->buf;
databuf.len = BUF_LEN;
DWORD dwRecv = 0;
DWORD dwFlags = 0;
WSARecv(p->s, &databuf, 1, &dwRecv, &dwFlags, &ppiod->overlapped, NULL);
//测试在s等待接收时，另一线程在s上投递发送会怎样
_beginthreadex(NULL, 0, Func, (void*)p->s, 0, NULL);
Sleep(2000);
PostRecv(p->s, 3);
PostRecv(p->s, 4);
PostAccept(pphd->s);
PostAccept(pphd->s);
}
}
return 0;
}
int main()
{
WSADATA ws;
if(WSAStartup(MAKEWORD(2, 2), &ws) != 0)
{
std::cout<<"WSAStartup error : "<<GetLastError()<<std::endl;
return -1;
}
HANDLE hcp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
if(NULL == hcp)
{
std::cout<<"create completion port failed : "<<GetLastError()<<std::endl;
return -1;
}
std::set<HANDLE> setWorkers;
SYSTEM_INFO si;
GetSystemInfo(&si);
for(int i = 0; i < si.dwNumberOfProcessors * 2 + 2; i++)
{
HANDLE worker = (HANDLE)_beginthreadex(NULL, 0, ThreadFunc, (LPVOID)hcp, 0, NULL);
if(NULL == worker)
{
std::cout<<"create thread failed : "<<GetLastError()<<std::endl;
return -1;
}
setWorkers.insert(worker);
}
SOCKET s = SocketInitBindListen();
if(INVALID_SOCKET == s)
{
std::cout<<"socket init failed"<<std::endl;
return -1;
}
LPPER_HANDLE_DATA pphd = new PER_HANDLE_DATA;
pphd->s = s;
CreateIoCompletionPort((HANDLE)s, hcp, (DWORD)pphd, 0);
bool ret = PostAccept(s);
if(false == ret)
{
std::cout<<"PostAccept Failed"<<std::endl;
return -1;
}
//退出控制
/*std::cin.get();
for(int i = 0; i < setWorkers.size(); i++)
PostQueuedCompletionStatus(hcp, -1, NULL, NULL);*/
auto iter = setWorkers.begin();
for(; iter != setWorkers.end(); iter++)
WaitForSingleObject(*iter, INFINITE);
WSACleanup();
std::cin.get();
return 0;
}
客户端代码与IOCP二相同。