openbcm

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time.c (1901B)

      1 /*
      2  * 
      3  * This license is set out in https://raw.githubusercontent.com/Broadcom-Network-Switching-Software/OpenBCM/master/Legal/LICENSE file.
      4  * 
      5  * Copyright 2007-2019 Broadcom Inc. All rights reserved.
      6  *
      7  * File: 	time.c
      8  * Purpose:	Time management
      9  */
     10 
     11 
     12 #include <sys/types.h>
     13 #include <sys/time.h>
     14 #if defined(linux) || (__STRICT_ANSI__)
     15 #include <time.h>
     16 #endif
     17 #include <sal/core/time.h>
     18 
     19 #ifdef COMPILER_HAS_DOUBLE
     20 
     21 /*
     22  * Function:
     23  *	sal_time_double
     24  * Purpose:
     25  *	Returns the time since boot in seconds.
     26  * Returns:
     27  *	Double precision floating-point seconds.
     28  * Notes:
     29  *	Useful for benchmarking.
     30  *	Made to be as accurate as possible on the given platform.
     31  */
     32 
     33 double
     34 sal_time_double(void)
     35 {
     36     struct timeval	tv;
     37     gettimeofday(&tv, 0);
     38     return (tv.tv_sec + tv.tv_usec * 0.000001);
     39 }
     40 
     41 #endif /* COMPILER_HAS_DOUBLE */
     42 
     43 
     44 /*
     45  * Function:
     46  *	sal_time_usecs
     47  * Purpose:
     48  *	Returns the relative time in microseconds modulo 2^32.
     49  * Returns:
     50  *	Time in microseconds modulo 2^32
     51  * Notes:
     52  *	The precision is limited to the Unix clock period.
     53  *	Time is monotonic if supported by the O/S.
     54  */
     55 
     56 sal_usecs_t
     57 sal_time_usecs(void)
     58 {
     59     struct timeval	ltv;
     60 #ifdef CLOCK_MONOTONIC
     61     struct timespec	lts;
     62     if (clock_gettime(CLOCK_MONOTONIC, &lts) == 0) {
     63         return (lts.tv_sec * SECOND_USEC + lts.tv_nsec / 1000);
     64     }
     65 #endif
     66     /* Fall back to RTC if monotonic clock unavailable */
     67     gettimeofday(&ltv, 0);
     68     return (ltv.tv_sec * SECOND_USEC + ltv.tv_usec);
     69 }
     70     
     71 /*
     72  * Function:
     73  *	sal_time
     74  * Purpose:
     75  *	Return the current time in seconds since 00:00, Jan 1, 1970.
     76  * Returns:
     77  *	Time in seconds
     78  * Notes:
     79  *	This routine must be implemented so it is safe to call from
     80  *	an interrupt routine.  It is used for timestamping and other
     81  *	purposes.
     82  */
     83 
     84 sal_time_t
     85 sal_time(void)
     86 {
     87     /* "Interrupt safe" since intrs are fake for PLISIM */
     88     return (sal_time_t) time(0);
     89 }