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On Mar 27 20:59, Christian Franke wrote:Corinna Vinschen wrote:Hmpf, ok. Boy is that ugly.On Mar 27 20:01, Christian Franke wrote:Corinna Vinschen wrote:On Mar 26 19:00, Christian Franke wrote:Corinna Vinschen wrote:Uh, right, I misunderstood. I reverted the change to clock_setres.I see your point, but what bugs me a bit is the fact that clock_getres(CLOCK_REALTIME) and clock_setres(CLOCK_REALTIME) will always return the same value coarsest, regardless what value has been set.If clock_setres was called and succeeded, then clock_getres(.) should return the value set before.
If clock_setres was not called, the coarsest value is IMO the only value that can be guaranteed.
The actual value returned by NtQueryTimerResolution is simply useless in this context: It is the minimum of all resolutions currently set by all running processes. It may change at any time. There is apparently no way the query the current setting of the current process.Sorry, I probably forgot to mention that NtSetTimerResolution returns the same useless actual value than NtQueryTimerResolution.
I would suggest:
status = NtSetTimerResolution (period, TRUE,&actual); if (!NT_SUCCESS (status)) { ... return -1; } - minperiod = actual; + minperiod = period;But that's not right. The "actual" value is not useless, but the value the resolution has actually been set to.No, again this is the minimum of all resolutions currently set by all processes.
The OS just doesn't support arbitrary values for the period.
Yes - but in 'actual' a smaller value than the value set for the current process may be returned.
Is there a chance that actual is bigger than period? In that case we should perhaps set minperiod like this:
minperiod = MAX (actual, period);
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