libgloss/riscv/sys_times.c

   1 #include <machine/syscall.h>
   2 #include <sys/types.h>
   3 #include <sys/times.h>
   4 #include <sys/time.h>
   5 #include "internal_syscall.h"
   6
   7 extern int _gettimeofday(struct timeval *, void *);
   8
   9 /* Timing information for current process. From
  10    newlib/libc/include/sys/times.h the tms struct fields are as follows:
  11
  12    - clock_t tms_utime  : user clock ticks
  13    - clock_t tms_stime  : system clock ticks
  14    - clock_t tms_cutime : children's user clock ticks
  15    - clock_t tms_cstime : children's system clock ticks
  16
  17    Since maven does not currently support processes we set both of the
  18    children's times to zero. Eventually we might want to separately
  19    account for user vs system time, but for now we just return the total
  20    number of cycles since starting the program.  */
  21 clock_t
  22 _times(struct tms *buf)
  23 {
  24   static char initialized;
  25   static struct timeval t0;
  26   struct timeval t;
  27
  28   _gettimeofday (&t, 0);
  29
  30   // when called for the first time, initialize t0
  31   if (!initialized) {
  32     t0.tv_sec = t.tv_sec;
  33     t0.tv_usec = t.tv_usec;
  34     initialized = 1;
  35   }
  36
  37   long long utime = (t.tv_sec - t0.tv_sec) * 1000000 + (t.tv_usec - t0.tv_usec);
  38   buf->tms_utime = utime * CLOCKS_PER_SEC / 1000000;
  39   buf->tms_stime = buf->tms_cstime = buf->tms_cutime = 0;
  40
  41   return buf->tms_utime;
  42 }