Thread: pthread problem: incompatibl type used in creation

hello,
I am writing a basic chat client, but when I try to create the pthreads i get this error message
'passing argument 3 of 'pthread_create' from incompatible pointer type' along with 'too many arguments to function 'pthread_create'

the code I am using is as follows, and I am unsure as why the errors are being thrown

Code:

void *threadWrite(int sock,int n, struct sockaddr_in server, struct sockaddr_in from , struct hostent *hp, char *argv[]){
size_t length;char buffer[256];
while(1){
bcopy((char *)hp->h_addr, 
        (char *)&server.sin_addr,
         hp->h_length);
   server.sin_port = htons(atoi(argv[2]));
   length=sizeof(struct sockaddr_in);
   printf("Please enter the message: ");
   bzero(buffer,256);
   fgets(buffer,255,stdin);
   n=sendto(sock,buffer,
            strlen(buffer),0,&server,length);
   if (n < 0) error("Sendto");
}
pthread_exit((void*) 27);
}

void *threadWait(int sock, int n, struct sockaddr_in from){
size_t length = sizeof(struct sockaddr_in);
char buffer[256];
while(1){
	n = recvfrom(sock,buffer,256,0,&from, &length);
   		if (n < 0) error("recvfrom");
  		// write(1,"Got an ack: ",12);
   		write(1,buffer,n);
}
}

void join(int sock,int n,struct sockaddr_in server, struct sockaddr_in from , struct hostent *hp, char *argv[] ){
size_t length;
char buffer[256];
bcopy((char *)hp->h_addr, 
        (char *)&server.sin_addr,
         hp->h_length);
   server.sin_port = htons(atoi(argv[2]));
   length=sizeof(struct sockaddr_in);
   printf("Please enter your nickname: ");
   bzero(buffer,256);
   fgets(buffer,255,stdin);
   n=sendto(sock,buffer,
            strlen(buffer),0,&server,length);
   if (n < 0) error("Sendto");
   n = recvfrom(sock,buffer,256,0,&from, &length);
   if (n < 0) error("recvfrom");
 
pthread_t waitingThread;
pthread_t writingThread;

int waitingResult = pthread_create(
	&waitingThread,
	NULL,
	&threadWait,
	(void*) sock, n,from);

int writingResult = pthread_create(
	&writingThread,
	NULL,
	&threadWrite,
	(void*) sock, n, server, from, hp, argv);

if(waitingResult !=0){
	printf("Could not create waiting thread\n");
	exit(1);
}
if(writingResult !=0){
	printf("Could not create writing thread\n");
	exit(1);
}
}

I have ommited the networking code, as this works fine and is producing no problems, will include if needed

many thanks,
Fiona

pthread_create must be used to start a function with the following signature:

Code:

void *thread_function(void *);

You cannot pass more than one argument. If you want to pass more than one argument in, create a struct that contains all the info you want to pass in and give it a pointer to that.

Have a look at `man pthread_create` (or google that) for details.