组播

关于消息队列的使用

http://www.cnblogs.com/chenpingzhao/p/5262050.html

消息队列采用高可用，可持久化的消息中间件。比如Active MQ，Rabbit MQ，Rocket Mq。

 ZeroMQ

号称史上最快的消息队列

性能对比见http://blog.youkuaiyun.com/abcd1f2/article/details/47318693

ZeroMQ的C版本nanomsg

Sender.cpp

 

#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

#define HELLO_PORT 12345
#define HELLO_GROUP "225.0.0.37"

int main(int argc, char *argv[])
{
	struct sockaddr_in addr;
	int fd, cnt;
	struct ip_mreq mreq;
	char *message="Hello, World!";

	/* create what looks like an ordinary UDP socket */
	if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) 
	{
		perror("socket");
		exit(1);
	}

	/* set up destination address */
	memset(&addr,0,sizeof(addr));
	addr.sin_family=AF_INET;
	addr.sin_addr.s_addr=inet_addr(HELLO_GROUP);
	addr.sin_port=htons(HELLO_PORT);

	/* now just sendto() our destination! */
	while (1)
	{
		if (sendto(fd,message, strlen(message), 0, (struct sockaddr *) &addr, sizeof(addr)) < 0) 
		{
			perror("sendto");
			exit(1);
		}
		sleep(1);
	}
}

 

Recver.cpp 文件内容如下：

 

#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

#define HELLO_PORT  12345
#define HELLO_GROUP "225.0.0.37"
#define MSGBUFSIZE 256

int main(int argc, char *argv[])
{
	struct sockaddr_in addr;
	int fd, nbytes,addrlen;
	struct ip_mreq mreq;
	char msgbuf[MSGBUFSIZE];

	u_int yes=1; /*** MODIFICATION TO ORIGINAL */

	/* create what looks like an ordinary UDP socket */
	if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) 
	{
		perror("socket");
		exit(1);
	}


	/**** MODIFICATION TO ORIGINAL */
	/* allow multiple sockets to use the same PORT number */
	if (setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0) 
	{
		perror("Reusing ADDR failed");
		exit(1);
	}
	/*** END OF MODIFICATION TO ORIGINAL */

	/* set up destination address */
	memset(&addr,0,sizeof(addr));
	addr.sin_family=AF_INET;
	addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
	addr.sin_port=htons(HELLO_PORT);

	/* bind to receive address */
	if (bind(fd,(struct sockaddr *) &addr,sizeof(addr)) < 0)
	{
		perror("bind");
		exit(1);
	}

	/* use setsockopt() to request that the kernel join a multicast group */
	mreq.imr_multiaddr.s_addr=inet_addr(HELLO_GROUP);
	mreq.imr_interface.s_addr=htonl(INADDR_ANY);
	if (setsockopt(fd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0) 
	{
		perror("setsockopt");
		exit(1);
	}

	/* now just enter a read-print loop */
	while (1) 
	{
		addrlen=sizeof(addr);
		if ((nbytes=recvfrom(fd,msgbuf,MSGBUFSIZE,0, (struct sockaddr *) &addr,(socklen_t*)&addrlen)) < 0) 
		{
			perror("recvfrom");
			exit(1);
		}
		puts(msgbuf);
	}

	return 0;
}

教程：

http://blog.youkuaiyun.com/langeldep/article/details/6167137