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當我試圖連接到服務器只有一個客戶端，服務器recv()功能不會延遲。c + + tcp服務器（windows操作系統） - recv（）延遲當有多個1連接到服務器
但是，當我啓動客戶端控制檯多於1次（類似7次）時，發送到服務器數據包的功能send()之後會有2000毫秒的延遲，直到服務器將打印數據包在控制檯中。
是否有任何解決方案，無需爲每個客戶端啓動線程？ （Windows限制每個進程的線程數量）。
代碼編譯與Visual Studio 2008，這是完整的服務器代碼：
#include <WinSock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#include <Windows.h>
#include <stdio.h>
struct sslv3
{
#define max_clients 1024
private:
int cClient;
public:
SOCKET fd;
int CurrentClient()
{
return cClient;
}
struct client
{
client()
{
Valid = false;
}
bool Valid;
DWORD ip;
WORD port;
char ipstr[33];
char portstr[33];
SOCKET fd;
void StrGen()
{
wsprintf(ipstr, "%d.%d.%d.%d", ip & 0xFF, (ip & 0xFF00)/0x100, (ip & 0xFF0000)/0x10000, (ip & 0xFF000000)/0x1000000);
wsprintf(portstr, "%d", port);
}
} clients[max_clients];
//
sslv3(bool server_client)
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
cClient = 0;
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
//
DWORD timeout = 1;
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(DWORD));
}
int Bind(WORD port)
{
int ret = 0;
sockaddr_in local;
local.sin_addr.s_addr = htonl(INADDR_ANY);
local.sin_family = AF_INET;
local.sin_port = htons(port);
if((ret = bind(fd, (struct sockaddr *)&local, sizeof(local)))
!= SOCKET_ERROR)
listen(fd, SOMAXCONN);
return ret;
}
int Accept()
{
SOCKET clientfd;
sockaddr_in client;
int addrlen = sizeof(client);
clientfd = accept(fd, (struct sockaddr *)&client, &addrlen);
if(clientfd == -1)
return -1;
clients[cClient].ip = client.sin_addr.S_un.S_addr;
clients[cClient].port = client.sin_port;
clients[cClient].StrGen();
clients[cClient].fd = clientfd;
clients[cClient].Valid = true;
//
DWORD timeout = 1;
setsockopt(clients[cClient].fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(DWORD));
cClient++;
if(cClient >= max_clients)
{
cClient = 0;
return max_clients - 1;
}
return cClient - 1;
}
int Connect(char ip[], WORD port)
{
sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(ip);
addr.sin_port = htons(port);
return connect(fd, (const struct sockaddr*)&addr, sizeof(addr));
}
int Send(SOCKET sfd, void* buffer, int length)
{
return send(sfd, (char*)buffer, length, 0);
}
int Read(SOCKET sfd, void* buffer, int length)
{
return recv(sfd, (char*)buffer, length, 0);
}
};
sslv3 cssl(true);
DWORD WINAPI ReadThread(void* args)
{
while(true)
{
for(int j = 0; j <= cssl.CurrentClient(); j++)
{
if(cssl.clients[j].Valid)
{
char rpack[1024];
for(int i = 0; i < sizeof(rpack); i++)
rpack[i] = 0;
if(cssl.Read(cssl.clients[j].fd, rpack, sizeof(rpack)) > 0){
printf("%s:%s says: %s\n", cssl.clients[j].ipstr, cssl.clients[j].portstr, rpack);
}
}
}
Sleep(1);
}
return TRUE;
}
int main()
{
cssl.Bind(1234);
CreateThread(0,0,ReadThread,0,0,0);
while(true)
{
Sleep(1);
int cid = cssl.Accept();
if(cid != -1){
printf("%s:%s connected!\n", cssl.clients[cid].ipstr, cssl.clients[cid].portstr);
}
}
return 0;
}
下面是一個完整的客戶端代碼：
#include <WinSock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#include <Windows.h>
#include <stdio.h>
#include <iostream>
using namespace std;
struct sslv3
{
#define max_clients 1024
private:
int cClient;
public:
SOCKET fd;
int CurrentClient()
{
return cClient;
}
struct client
{
client()
{
Valid = false;
}
bool Valid;
DWORD ip;
WORD port;
char ipstr[33];
char portstr[33];
SOCKET fd;
void StrGen()
{
wsprintf(ipstr, "%d.%d.%d.%d", ip & 0xFF, (ip & 0xFF00)/0x100, (ip & 0xFF0000)/0x10000, (ip & 0xFF000000)/0x1000000);
wsprintf(portstr, "%d", port);
}
} clients[max_clients];
//
sslv3(bool server_client)
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
cClient = 0;
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
//
DWORD timeout = 1;
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(DWORD));
}
int Bind(WORD port)
{
int ret = 0;
sockaddr_in local;
local.sin_addr.s_addr = htonl(INADDR_ANY);
local.sin_family = AF_INET;
local.sin_port = htons(port);
if((ret = bind(fd, (struct sockaddr *)&local, sizeof(local)))
!= SOCKET_ERROR)
listen(fd, SOMAXCONN);
return ret;
}
int Accept()
{
SOCKET clientfd;
sockaddr_in client;
int addrlen = sizeof(client);
clientfd = accept(fd, (struct sockaddr *)&client, &addrlen);
if(clientfd == -1)
return -1;
clients[cClient].ip = client.sin_addr.S_un.S_addr;
clients[cClient].port = client.sin_port;
clients[cClient].StrGen();
clients[cClient].fd = clientfd;
clients[cClient].Valid = true;
//
DWORD timeout = 1;
setsockopt(clients[cClient].fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(DWORD));
cClient++;
if(cClient >= max_clients)
{
cClient = 0;
return max_clients - 1;
}
return cClient - 1;
}
int Connect(char ip[], WORD port)
{
sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(ip);
addr.sin_port = htons(port);
return connect(fd, (const struct sockaddr*)&addr, sizeof(addr));
}
int Send(SOCKET sfd, void* buffer, int length)
{
return send(sfd, (char*)buffer, length, 0);
}
int Read(SOCKET sfd, void* buffer, int length)
{
return recv(sfd, (char*)buffer, length, 0);
}
};
sslv3 cssl(false);
int main()
{
cssl.Connect("127.0.0.1", 1234);
while(true)
{
printf("say: ");
char buf[1024];
for(int i = 0; i < sizeof(buf); i++)
buf[i] = 0;
cin >> buf;
int len = strlen(buf);
cssl.Send(cssl.fd, buf, len);
}
return 0;
}
你寫了一個無限循環，在其睡眠和你問的延遲？ – EJP 2013-02-12 11:49:21
它休眠1ms給CPU一個休息。 – 2013-02-12 12:37:53
它應該調用select（）來'給CPU一箇中斷'，具有正確的持續時間。 – EJP 2013-02-12 20:27:31