Improve the performance of an existing single-threaded calcpi program by converting it to a multi-threaded implementation. The included driver (main.cpp) parses the command line arguments, calls count_pi() and prints the results. The driver takes 2 command line arguments: an integer radius and number of threads.
Calculates PI by summing the circle's area, as explained here:
https://en.wikipedia.org/wiki/Approximations_of_%CF%80#Summing_a_circle's_area
You need to re-implement count_pi() in calcpi.cpp to make it multi-threaded.
To compile the code:
$ make
To run it with r=1000 and n_threads=1:
$ ./calcpi 1000 1