[Openais] changing gettimeofday to times

[Fabien THOMAS]

under darwin:
clock_get_time
The clock_get_time function returns the current time kept by a clock.  
The value returned is a monotonically increasing value (unless  
tampered with via the clock_set_time function).


> under my previous mail i incorrectly stated that clock_gettime is
> unavailable under Darwin and FreeBSD:
> it exist under FreeBSD with CLOCK_MONOTONIC.
>
> steven do you need a clock that can be converted to time of day ?
>
> Le 20 nov. 06 à 13:38, Alejandro López a écrit :
>
>> Hi Steven,
>>
>> on Solaris you can use the function posix clock_gettime():
>>
>> Realtime Library Functions                     clock_settime(3RT)
>>
>> NAME
>>      clock_settime, clock_gettime, clock_getres - high-resolution
>>      clock operations
>>
>> SYNOPSIS
>>      cc [ flag... ] file... -lrt [ library... ]
>>      #include <time.h>
>>
>>      int clock_gettime(clockid_t clock_id, struct timespec *tp);
>>
>>
>> with clock_id CLOCK_HIGHRES:
>>
>>      A clock_id of CLOCK_HIGHRES represents  the  non-adjustable,
>>      high-resolution  clock  for  the system. For this clock, the
>>      value returned by clock_gettime(3RT) represents  the  amount
>>      of  time  (in  seconds and nanoseconds) since some arbitrary
>>      time in the past; it is not correlated in  any  way  to  the
>>      time  of  day,  and  thus  is  not  subject  to resetting or
>>      drifting   by    way    of    adjtime(2),    ntp_adjtime(2),
>>      settimeofday(3C),  or  clock_settime().  The time source for
>>      this clock is the same as that for gethrtime(3C).
>>
>>
>> This function is also available on linux but the clock_id is
>> CLOCK_MONOTONIC.
>>
>>
>>
>>
>>
>> Or you could use the Solaris-specific gethrtime():
>>
>>
>> Standard C Library Functions                        gethrtime(3C)
>>
>>
>>
>> NAME
>>      gethrtime, gethrvtime - get high resolution time
>>
>> SYNOPSIS
>>      #include <sys/time.h>
>>
>>      hrtime_t gethrtime(void);
>>
>>      hrtime_t gethrvtime(void);
>>
>> DESCRIPTION
>>      The gethrtime() function returns the current high-resolution
>>      real time. Time is expressed as nanoseconds since some arbi-
>>      trary time in the past; it is not correlated in any  way  to
>>      the  time  of  day,  and thus is not subject to resetting or
>>      drifting by way of adjtime(2) or settimeofday(3C).  The  hi-
>>      res  timer  is  ideally  suited  to  performance measurement
>>      tasks, where cheap, accurate interval timing is required.
>>
>>      The  gethrvtime()  function  returns   the   current   high-
>>      resolution  LWP virtual time, expressed as total nanoseconds
>>      of execution time.
>>
>>      The gethrtime() and gethrvtime() functions  both  return  an
>>      hrtime_t, which is a 64-bit (long long) signed integer.
>>
>>
>>
>>
>> Hope this helps.
>> Alejandro.
>>
>>
>>
>> Steven Dake wrote:
>>> If the system time is changed while openais is running the timing
>>> system
>>> gets all out of wack.  This is because gettimeofday returns the
>>> current
>>> time, instead of the number of msec since boot and is used in the
>>> tlist
>>> code.
>>>
>>> There is a mechanism to determine the number of msec since boot  
>>> which
>>> appears to be portable.  The posix API is "times" which returns the
>>> number of clock ticks since system boot.
>>>
>>> The Linux man page says times returns a time value from some time
>>> in the
>>> past but on linux this is the system boot time.
>>>
>>> On BSD or Solaris, is this also the case?  I don't have the man
>>> pages to
>>> check these systems and would like a portable solution.  The other
>>> possibility is getitimer and setitimer or the posix timer_gettime
>>> absolute time but I think these posix APIs are not supported on all
>>> platforms.
>>>
>>> Regards
>>> -steve
>>>
>>> _______________________________________________
>>> Openais mailing list
>>> Openais at lists.osdl.org
>>> https://lists.osdl.org/mailman/listinfo/openais
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