Parallelization of integral calculation sharing memory with child processes

Build:

chmod +x ./build.sh
./build.sh

Test:

time ./build/single
time ./build/multi

Results (AMD Ryzen 3 3250U 4 cores):

In src/functions.cpp you can configure function you want to integrate.

Processes sync by managed_shared_memory, in which you can construct named objects and then find them. Multiprocess conversation produced by bounded multi-produser multi-consumer blocking queue.