The operating system can preempt any subroutine at any moment for an arbitrarily long period of time, so we cannot be sure of completing critical tasks without interference or delay.
The operating system can preempt any subroutine at any moment for an arbitrarily long period of time, so we cannot be sure of completing critical tasks without interference or delay.
操作系统可以在任何时间为一个任意长时间段分配任何的程序，所以我们不能排除冲突或者延迟来确定临界程序完成。