Hi there, I did some testing and it looks like the sample solution just increments the time after unblocking a process, and then uses that time as the point of reference to check if the next process can be unblocked. E.g. in the example below, the R/W process is set to unblock at 92usecs, which happens to be during the unblocking of a sleeping process. As can be seen, the R/W process takes 100usecs as the comparison time and unblocks immediately after the sleeping process.