Segmentation fault in function that reads file and with threads

Question

I am having a problem writing a function that will be passed to a pthread_create. The function takes two arguments. I am getting segmentation fault while calling it.

And pthread_create:

pthread_create(&tid_array[i], NULL, searchForWord(argv[i + 2], word), &wData[i]);

Can function passed to pthread_create take other arguments than void *?

Answer 1

pthread_create takes a start routine, in the form of a function pointer.

The expression searchForWord(argv[i + 2], word) is not a function pointer; it calls searchForWord in the current thread, which always returns NULL, and then passes NULL to pthread_create.

The thread start function must take a pointer-to-void parameter, but you are free to create a struct, pass a pointer to that struct into the function. You'll get a pointer-to-void, which you can cast to pointer-to-your-struct.