Passing a structure to a thread in C

passStructPointerThread.c

/////////////////////////////////////////////___Global___////////////////////////////////////////////

struct myStruct{
        int a;
        int b;
};



/////////////////////////////////////////////___main Function___////////////////////////////////////////////

    void* thread_arg_v;
    int err = 0;
    myStruct s1;
    myStruct * s1_address;
    s1.a = 1;
    s1.b = 2;
    //thread_arg_v = (void*) thread_arg;//this is not possible may be because size of struct is more than 
                                        //size of void pointer
    s1_address = &s1;

    thread_arg_v = (void *) err;// this is possible and now you have to pass thread_arg_v to pthread_create

    if((err = pthread_create(&thread_id, NULL, threadHandler, &s1_address ))!=0) {
        perror("Error while creating thread\n");
    }


/////////////////////////////////////////////___threadHandler Function___//////////////////////////////////////////


    myStruct * s2;
    s2 = (myStruct*) (arg);//arg is parameter of threadHandler

passStructThread.c

/////////////////////////////////////////////___Global___////////////////////////////////////////////

struct myStruct{
        int a;
        int b;
};



/////////////////////////////////////////////___main Function___////////////////////////////////////////////

    void* thread_arg_v;
    int err = 0;
    myStruct s1;
    s1.a = 1;
    s1.b = 2;
    //thread_arg_v = (void*) thread_arg;//this is not possible may be because size of struct is more than 
                                        //size of void pointer

    thread_arg_v = (void *) err;// this is possible and now you have to pass thread_arg_v to pthread_create

    if((err = pthread_create(&thread_id, NULL, threadHandler, &s1 ))!=0) {
        perror("Error while creating thread\n");
    }


/////////////////////////////////////////////___threadHandler Function___//////////////////////////////////////////


    myStruct s2;
    s2 = *( (myStruct*) (arg) );//arg is parameter of threadHandler