●●● ●●●● 6.2 The Critical-Section Problem::: ●●●● o Two approaches to handle critical sections in Os o Non-preemptive kernels a kernel-mode process will run until it exits kernel mode, or blocks It is essentially free from race conditions on kernel data structures, as only one process is active in the kernel at a time Windows XP 2000, Traditional UNIX, Linux(prior to 216 6.2 The Critical-Section Problem ⚫ Two approaches to handle critical sections in OS ⚫ Non-preemptive kernels ▪ A kernel-mode process will run until it exits kernel mode, or blocks. ▪ It is essentially free from race conditions on kernel data structures, as only one process is active in the kernel at a time ▪ Windows XP/2000、Traditional UNIX、Linux (prior to 2.6)