Adding solution
Adding Sync.py
Quick fix
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Adding lecture 14
Log2 scale
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Bug fix in Sync.py
Adding lecture15
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems
Adding hw04 soln
Adding code for quiz 4
Adding list2_soln.c
Adding lecture18
Adding lecture19
Adding mutex example
Fixing matrix_soln.c
Adding exam2
Fixing matrix2.c
Merge branch 'master' of https://github.com/AllenDowney/SoftwareSystems