Please use thread to complete the following program: one process opens a file data.txt, then creates a thread my_thread. The job of the thread my_thread is to count how many lines exist in the file data.txt, and return the number of lines to the calling process. The process then prints this number to the screen.

Basically, you need to implement main_process.c and thread_function.c.

Basic structure of main_process.c:

int main ()

{

Open the file data.txt and obtain the file handler fh;

Create a thread my_thread using pthread_create; pass fh to my_thread;

Wait until my_thread terminates, using pthread_join;

Print out how many lines exist in data.txt.

}

Basic structure of thread_function.c:

void *count_lines(void *arg)

{

Obtain fh from arg;

Count how many lines num_lines exist in fh;

Close fh;

Return num_lines

}

For information about pthread_create and pthread_join:

man pthread_create

man pthread_join

How to compile and link your program:

gcc -o my_example main_process.c thread_function.c -lpthread

You can create a simple data.txt to test your program.