babbage% gcc -o read-write-2 read-write-2.c && read-write-2 
The reader process begins.
The writer process begins.
Writer's report: item  0 put in buffer
Writer's report: item  1 put in buffer
Writer's report: item  2 put in buffer
Writer's report: item  3 put in buffer
Reader's report: item  0 ==  0
Reader's report: item  1 ==  1
Reader's report: item  2 ==  4
Reader's report: item  3 ==  9
Writer's report: item  4 put in buffer
Writer's report: item  5 put in buffer
Writer's report: item  6 put in buffer
Writer's report: item  7 put in buffer
Reader's report: item  4 == 16
Reader's report: item  5 == 25
Reader's report: item  6 == 36
Reader's report: item  7 == 49
Writer's report: item  8 put in buffer
Writer's report: item  9 put in buffer
Reader's report: item  8 == 64
Reader's report: item  9 == 81
Reader done.
Writer done.