operating-system - 指令交织是如何完成的？

Question

Race condition如给出的示例operating System Concepts是

count++ could be implemented as 
register = count
register = register1 + 1
count = register1

count-- could be implemented as
register2 = count
register2 = register2 - 1
count = register

consider this execution interleaving

s0: producer execute register = count
s1: producer execute register1 = register1 + 1
s2: consumer execute register2 = count
s3: consumer execute register2 = register2 - 1
s4: producer execute count = register1
s5: consumer execute count = register2

指令的交错是如何决定的？它是随机的还是使用了某种算法？而且，是谁决定的？

Answer 1

你可以认为它是随机的。该示例是一个非常简化的解释，仅用于说明该概念，实际上还有更多内容。

看看这个答案：编译器在多线程程序中使用寄存器

Answer 2

在这种情况下，它可能指的是 2 个被调度的实体被赋予对处理器的控制权以便调度程序决定的方式。