src/util/cpu_time.c

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#include "util.h"

#if HAVE_SYS_TYPES_H
#  include<sys/types.h>
#endif

#if HAVE_SYS_TIMES_H
#  include<sys/times.h>
#endif

/*---------------------------------------------------------------------------*/
/* Static function prototypes                                                */
/*---------------------------------------------------------------------------*/

long 
util_cpu_time(void)
{
    long t = 0;

#if HAVE_SYSCONF == 1

    /* Code for POSIX systems */

    struct tms buffer;
    long nticks;                /* number of clock ticks per second */

    nticks = sysconf(_SC_CLK_TCK);
    times(&buffer);
    t = (long) (buffer.tms_utime * (1000.0/nticks));

#else
#  ifndef vms

    /* Code for non-POSIX systems */

    struct tms buffer;

    time(&buffer);
    t = buffer.tms_utime * 1000.0 / CLOCK_RESOLUTION;

#  else

    /* Code for VMS (?) */

    struct {int p1, p2, p3, p4;} buffer;
    static long ref_time;
    times(&buffer);
    t = buffer.p1 * 10;
    if (ref_time == 0)
      ref_time = t;
    t = t - ref_time;

#  endif /* vms */
#endif /* _POSIX_VERSION */

    return t;
}

long 
util_cpu_ctime(void)
{
    long t = 0;

#if HAVE_SYSCONF == 1

    /* Code for POSIX systems */

    struct tms buffer;
    long nticks;                /* number of clock ticks per second */

    nticks = sysconf(_SC_CLK_TCK);
    times(&buffer);
    t = (long) ((buffer.tms_utime + buffer.tms_cutime) * (1000.0/nticks));

#else
#  ifndef vms

    /* Code for non-POSIX systems */

    struct tms buffer;

    time(&buffer);
    t = (buffer.tms_utime + buffer.tms_cutime) * 1000.0 / CLOCK_RESOLUTION;

#  else

    /* Code for VMS (?) */

    struct {int p1, p2, p3, p4;} buffer;
    static long ref_time;
    times(&buffer);
    t = (buffer.p1 + buffer.p3) * 10;
    if (ref_time == 0)
      ref_time = t;
    t = t - ref_time;

#  endif /* vms */
#endif /* _POSIX_VERSION */

    return t;
}

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