Errors while passing arguments into pthread_create() function - Visual C++

Not sure if this answers your question (or what your question was), but here is some code that compiles and gives what you might expect for the output:

    #include <windows.h> 
    #include <stdio.h>
    #include <pthread.h> 
    int main()  {
      pthread_t f2_thread, f1_thread; 
      void *f2(void*), *f1(void*);
      int i1,i2;
      i1 = 1;
      i2 = 2;
      pthread_create(&f1_thread,NULL,f1,&i1);
      pthread_create(&f2_thread,NULL,f2,&i2);
      pthread_join(f1_thread,NULL);
      pthread_join(f2_thread,NULL);

      return 0;

    }
    void *f1(void *x){
  int* data = static_cast<int*>(x);
      int i = *data;
      Sleep(1);
      printf("f1: %d",i);
      pthread_exit(0); 
      return 0;
    }
    void *f2(void *x){
      int* data = static_cast<int*>(x);
      int i = *data;
      Sleep(1);
      printf("f2: %d",i);
      pthread_exit(0); 
      return 0;
    }

So

1. Having void* arguments in the prototypes then casting those to int*
2. Having each function return 0

Please add "return NULL:" before exit your thread functions.