miscelaneous code for testing purposes

Douglas R Andreani 928c1a4f3c go-music: refactor code and add testing scenarios 5 anni fa
go-music 928c1a4f3c go-music: refactor code and add testing scenarios 5 anni fa
libpng cefa4e0c5c libpng: add error handling to non existing file 5 anni fa
pthread 1b74b0c461 initial pthread and q_thread_model 5 anni fa
queue_thread_model ef3e64cec5 changes to output on q_thread_model 5 anni fa
x11-random 1bc1b312e7 x11: fix random generation 5 anni fa