Passing arguments to thread in C

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


void *run(void *thread_arg);

struct thread_args {
  
      int arraylength;
      int *ptr;
      char *name;
};
        
int main() {
        
  pthread_t thread_id;
  struct thread_args *thread_data;
 

  int array[10] = { 1,2,3,4,5,6,7,8,9,10 };
  
  
  thread_data->arraylength = 10;
  thread_data->ptr = &array[0];
 
  strcpy(thread_data->name,"David"); /* Is this correct ? */
  printf("%s",thread_data->name); //This prints nothing

  
  pthread_create(&thread_id,NULL,run,(void *)&thread_data);
  pthread_join(thread_id,NULL);
  return 0;
  }    
       

 void *run(void *thread_arg) {
        printf("hi");
        struct thread_args *my_data;
        my_data = (struct thread_args *)thread_arg;
        printf("%s",my_data->name);
         
         
  }

    struct thread_args thread_data;
    ...  
    thread_data.arraylength = 10;
    thread_data.ptr = &array[0];

    struct thread_args thread_data;
    struct thread_args *pthread_data = &thread_data;
    
    ...  
    pthread_data->arraylength = 10;
    pthread_data->ptr = &array[0];
    ...
    pthread_create(&thread_id,NULL,run,(void *)pthread_data);