typedef struct {
  const char * filename;
  const char * filemode;
} FileInfo;

// used to pass lines of text to or from threads

typedef struct {
  char * lines;
  int length;
} CharBuf;

// -------------functions--------------

void *sortBuffer(void *arg);
void *readFile(void *arg);
void printBuffer (const char message [], CharBuf * buffer);

1. Launch a new thread, passing it the function sortBuffer and data to sort in variable data of type CharBuf using a function with the following interface (note that this is not exactly the same as that in the lectures):

   int start_thread (void *(*start_routine)(void*),void *arg);

   Assume the function returns an integer thread ID for later use to identify the thread.
   
   CharBuf data;
   int newID;
   
   newID = start_thread (sortBuffer, &data);
   
2. Wait for the thread to complete, using the following function, which uses the thread ID returned from start_thread, and returns a pointer to a result of arbitrary type, and assign the result of the system call to a variable of type CharBuf. You will need to do a cast to avoid a compiler warning, since void * represents an arbitrary pointer type

   void * wait (int threadID);
   CharBuf * result;
   result = ((CharBuf *) wait (newID));