On Thu, May 15, 2014 at 11:41:32AM +0200, Michael Schnell wrote: > On 05/15/2014 11:18 AM, Michael Van Canneyt wrote: > > > > > >fpGetTimeOfDay is used to implement Now(). This should not be changed. > > Why not, If there are better ways ?
"Better" needs to be defined here. If you mean "faster", then you need to call through the vDSO, so just link to the C library and use their implementation. Chances are that you are linking to the C library anyway (we're on the lazarus list after all). There isn't much reason for fpc to implement this, but perhaps it warrants a comment in the documentation (e.g. "glibc may have a much faster implementation that doesn't use a syscall, if you're worried about performance"). gettimeofday() is the correct way to get the real wall clock time, there is no "better" way for fpc to implement it (except for using clock_gettime() with CLOCK_REALTIME, since technically gettimeofday() is obsolete). gettimeofday() is not what you want to use for a timer, though, since it will change when someone sets the time on the system. In that case you want to use clock_gettime() with CLOCK_MONOTONIC, or even CLOCK_MONOTONIC_RAW (linux only). GetTickCount64 will use this on linux, but it reduces the precision to milliseconds. You seem a bit confused about some of these things, and people are talking at cross purposes, so I'll end my part in the discussion here. Henry -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
