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How is a "system time unit" defined?

Martin Bober
Prodigy 240 points

Hi,

I want Semaphore_pend() to timeout after a specific amount of milliseconds. SYS/BIOS documentation says that the timeout parameter is specified in "system time units". How long exactly is a system time unit? Is it fixed or does it depend on the processor's clocking? If yes, on which external clock does it depend?


Thanks in advance.