new file:   appunti/condvar.c
	new file:   appunti/job-queue2.c
	new file:   appunti/job-queue3.c
	new file:   appunti/programmazione concorrente
	new file:   concurrent_programming/problema_1.c
	new file:   concurrent_programming/problema_2.c
	new file:   concurrent_programming/problema_3.c
	new file:   concurrent_programming/problema_4.c
Merge branch 'master' of https://github.com/magicleon94/operating-systems