LOCK instruction (x86 assembly)

[sith]

Hi,

does the LOCK instruction has any meaning in a single-processor system ? Or is only used in SMP-systems ?

What happens if a taskswitch occurs right after a LOCK instruction ?

Thnx,

Jeroen

[Tim]

does the LOCK instruction has any meaning in a single-processor system ? Or is only used in SMP-systems ?

It's not necessary on a single-processor system.

What happens if a taskswitch occurs right after a LOCK instruction ?

Nothing unusual... why? LOCK is an instruction prefix, not an instruction in its own right, so it won't get separated from the instruction itself.