Re: Adjustable wallclock (get/settimeofday, adjtimex)?
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Hello, Stanislav Meduna <stano@xxxxxxxxxx> writes: > I need to implement a NTP-like model soon, which means: > > - gettimeofday with best possible resolution and negligible > call delay > - settimeofday > - the ability to speed up or slow the clock (adjtime/adjtimex > or similar), both permanently or until the requested offset > is compensated for; the clock must not go backward I've described my approach in an older thread on this list: http://thread.gmane.org/gmane.os.ecos.general/25842/ I never bothered with sub-second resolution for setting time (settimeofday), so I just use cyg_libc_time_settime. > - the ability to initialize from / store the current time to > a battery-backed device I've used a hybrid between the emulated wallclock and a "real" wallclock device driver -- it only reads absolute time from the h/w via Cyg_WallClock::init_hw_seconds and writes via Cyg_WallClock::set_hw_seconds. Otherwise, it works like the emulated wallclock driver. Best regards, Daniel -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss