[GitHub] [incubator-nuttx] acassis edited a comment on pull request #4186: libc: Implement times function

[GitBox <gi...@apache.org>]

acassis edited a comment on pull request #4186:
URL: https://github.com/apache/incubator-nuttx/pull/4186#issuecomment-883350583


   Hi @xiaoxiang781216 why aren't the fields of tms filled?
   What happens when you run this example:
   ```
   #include <sys/times.h>
   #include <stdio.h>
   ...
   void start_clock(void);
   void end_clock(char *msg);
   ...
   static clock_t st_time;
   static clock_t en_time;
   static struct tms st_cpu;
   static struct tms en_cpu;
   ...
   void
   start_clock()
   {
       st_time = times(&st_cpu);
   }
   
   
   /* This example assumes that the result of each subtraction
      is within the range of values that can be represented in
      an integer type. */
   void
   end_clock(char *msg)
   {
       en_time = times(&en_cpu);
   
   
       fputs(msg,stdout);
       printf("Real Time: %jd, User Time %jd, System Time %jd\n",
           (intmax_t)(en_time - st_time),
           (intmax_t)(en_cpu.tms_utime - st_cpu.tms_utime),
           (intmax_t)(en_cpu.tms_stime - st_cpu.tms_stime));
   }
   ```


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