Cooperative vs. Preemptive Multitasking

In my search to discover the similarities and differences between the cooperative and preemptive multitasking methods, I have been hard-pressed to find an abundance of material. From what I can discern, there are no true similarities between the two, other than the obvious: both are multitasking methods, both require use of an operating system, etc. Differences, however, abound.
Cooperative multitasking is, for the most part, obsolete. In this method, each process periodically checks with the operating system to determine whether or not another program or process is in need of the CPU.…