On Tue, Sep 21, 2010 at 3:27 AM, Vincent Torri <vto...@univ-evry.fr> wrote: > > > On Tue, 21 Sep 2010, Gustavo Sverzut Barbieri wrote: > >> Hello all, >> >> As we all know ecore uses gettimeofday() to retrieve the time and >> schedule timeouts. Our own code in ecore and even elementary just use >> relative times, and we often have to resort to hacks to detect when >> timezone changes or user sets time. >> >> In order to solve this problem there is an API called clock_gettime() >> that may receive a parameter CLOCK_MONOTONIC. The origin is not >> guaranteed (often it is implemented as 0 = machine boot), but it does >> guarantee time does not go back. >> >> Raster says that ecore_time_get() and ecore_loop_time_get() are not >> supposed to return the unix epoch, although the implementation and >> thus the documentation said so... that lead people to use it as such >> (a quick grep in svn shows people often save this value to know >> timestamps... which is quite wrong). >> >> So we can fix it in 3 ways: >> >> 1. apply the attached patch that turns >> ecore_time_get()/ecore_loop_time_get() into monotonic, change >> occurrences of ecore_time_get()/ecore_loop_time_get() to be >> ecore_unix_time_get() (actually in some places they must be changed to >> something else, like gmtime or localtime) >> >> 2. create a new patch that introduces ecore_monotonic_time_get() >> and uses that from inside ecore_main.c >> >> 3. change the attached patch to at start do a gettimeofday() and >> register the time difference, then always consider that difference. it >> would be monotonic but with Epoch as reference... this may be >> extremely buggy if the system has a bad battery and clock is just set >> by ntp after your efl program is running. >> >> 1 is more correct, but maybe too close to 1.0 release to get it, so >> although I did the patch I may introduce the way I said in 2... >> >> comments? suggestions? > > and for Windows ?
Google returned http://stackoverflow.com/questions/211257/does-windows-provide-a-monotonically-increasing-clock-to-applications -- Gustavo Sverzut Barbieri http://profusion.mobi embedded systems -------------------------------------- MSN: barbi...@gmail.com Skype: gsbarbieri Mobile: +55 (19) 9225-2202 ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
