Pthreads and sockets

This is a discussion on Pthreads and sockets within the C Programming forums, part of the General Programming Boards category; I have a client/server program in which I am trying to use multithreading on the server side. I would like ...

  1. #1
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    Join Date
    Nov 2007
    Posts
    96

    Pthreads and sockets

    I have a client/server program in which I am trying to use multithreading on the server side. I would like the server to take create a master socket and then listen on this socket until a incoming connection comes in. When this happens I create a thread that handles the request while the main resumes listening for more connections coming in. However, when I try implement this my server successfully creates the thread and calls the appropriate functions and then responds on the socket passed in the struct to the thread. But for some reason the client never receives this data and is stuck waiting for the server's response. Is there an error which I have when passing my socket or I'm not really sure what is wrong. Thanks and here is a copy of what I have:

    Code:
    #include <netdb.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/wait.h>
    #include <string.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <errno.h>
    #include <pthread.h>
    #include "http.h"
    #include "myTCP.h"
    
    void *runner( void * ptr);
    
    struct parm{
    	int socket;
    	char path[100];
    	char *from; 
    	char *userAgent;
    };
    
    int main(int argc, char *argv[]) {
    	int	port=-999;		/* port number to connect to, on server */
    	int	msock=-999;		/* socket descriptor for connection */
    	int  iRet; //Return value for pthread_create
    	int  pid;
    
    
    	struct parm *p;
    
    	pthread_t aThread; //Thread to be executed
    
    	p=(struct parm *)malloc(sizeof(struct parm)); //Allocate space for the p structure
    
    	pid = getpid();
    	if(argc==1) {
    		p->userAgent = argv[0];
    		port = WL_PORT;	
    	} else if(argc==2) {
    		p->userAgent = argv[0];
    		if(atoi(argv[1]) >1024) {
    			port = atoi(argv[1]);
    		}
    		else {
    			port = WL_PORT;
    		}
    	} else {
    		fprintf(stderr,"ERROR: useage:  <%s> <path> [<port>]\n", argv[0]);
    		exit(1);
    	}
    	#ifdef DEBUG
    		fprintf(stderr,"DEBUG: %d %s will listen on port %d\n", pid, argv[0], port);
    	#endif
    
    
          msock = myTCPserverSocket(port, argv[0]); 
    
    
    	/* 
    	* Now accept connections and service clients forever,
    	*/
    	while(1) {
    		/*Accept the client's socket*/
    	      p->socket = myTCPaccept(msock, argv[0]);
    
    		iRet = pthread_create(&aThread, NULL, runner, (void *) p);
    
    		pthread_join(aThread, NULL);
    	}
    }
    
    void *runner( void *arg) {
    	int sleepTime =0;
    	int serverGet=-999;	/*Return value for the myHTTPserverGet function*/
    	int serverResp=-999;	/*Return value for the myHTTPserverResponse function*/
    
    	struct parm *p = (void *) arg;
    
    
    	//Get the client's request
    	if((serverGet = myHTTPserverGet(p->socket, p->path, p->from, p->userAgent, &sleepTime)) < 0) {
    	     	fprintf(stdout, "Trouble in myHTTPserverGet.\nReturn Value = %d\n", serverGet);
    	      exit(1); 
    	}
    
    	//sleep(sleepTime);			
    
    	//Respond to the Client
    	if((serverResp =myHTTPserverResponse(p->socket, p->userAgent, serverGet, p->path, sleepTime)) < 0) {
    		fprintf(stdout, "Trouble in myHTTPserverResponse.\nReturn Value = %d\n", serverResp);
    		exit(1);
    	}
    	pthread_exit(0);
    }
    Last edited by NuNn; 03-12-2009 at 11:25 AM.

  2. #2
    Registered User
    Join Date
    Nov 2007
    Posts
    96
    Nevermind, I figured it out....forgot to close the socket after the message was sent.

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