Thread: Void Pointer Warnings

Code:

#include <stdio.h>
#include <pthread.h>


#define MAX_LINES 500
#define LINE_LENGTH 80

typedef struct args ARGS;

char readin[MAX_LINES][LINE_LENGTH];

struct args{

        int NumCalls;
        int NumStored;

};

*MakeCalls(void* params){
//stuff cut out
}

int main(int argc, char* argv[]){

//initialize an in-memory array to con

int NumStored=0;
int NumThreads=atoi(argv[1]);
int NumCalls=atoi(argv[2]);
int x;

FILE *lines = fopen("lines.txt","r");
pthread_t threads[NumThreads];

ARGS params= {NumCalls,NumThreads};
ARGS *argptr = &params;

for(x=0;x<NumThreads;x++){

        pthread_create(&threads[x],NULL,MakeCalls,(void *)argptr);
}

now this code compiles fine, I havent tested if it works the way I want. but I was essentially wondering about parameter 3 in pthread_create since it's throwing a warning

sample.c:80: warning: passing arg 3 of `pthread_create' from incompatible pointer type

can someone possible explain why it's throwing a warning for argptr, or direct me to a place where I can figure it out for myself

So what you are saying is that the method should return void, which corrects that error.

Is there a reason as to why that would give an error though. As I understand it, the 3rd argument is expected to be a void * that is passed to the starting method for the thread.

What would this have to do with the return type of the method?

Either way, thx for the help.

When I say 3rd argument, I was refering to it as the "error" way, 0,1,2,3. It is the last argument I was refering to.

and As to not including C code, if that isnt, I've never seen C code in my life before. This is an for an OS course, and we are using processes and threads in C.

Mike