《操作系统》的实验代码。
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# assumes %bx has loop count in it
.main
.top
# critical section
mov 2000, %ax # get the value at the address
add $1, %ax # increment it
mov %ax, 2000 # store it back
# see if we're still looping
sub $1, %bx
test $0, %bx
jgt .top
halt