37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
#include <machine/syscall.h>
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#include <sys/types.h>
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#include <sys/times.h>
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#include <sys/time.h>
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#include "internal_syscall.h"
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extern int _gettimeofday(struct timeval *, void *);
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/* Timing information for current process. From
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newlib/libc/include/sys/times.h the tms struct fields are as follows:
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- clock_t tms_utime : user clock ticks
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- clock_t tms_stime : system clock ticks
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- clock_t tms_cutime : children's user clock ticks
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- clock_t tms_cstime : children's system clock ticks
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Since maven does not currently support processes we set both of the
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children's times to zero. Eventually we might want to separately
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account for user vs system time, but for now we just return the total
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number of cycles since starting the program. */
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clock_t
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_times(struct tms *buf)
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{
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// when called for the first time, initialize t0
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static struct timeval t0;
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if (t0.tv_sec == 0 && t0.tv_usec == 0)
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_gettimeofday (&t0, 0);
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struct timeval t;
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_gettimeofday (&t, 0);
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long long utime = (t.tv_sec - t0.tv_sec) * 1000000 + (t.tv_usec - t0.tv_usec);
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buf->tms_utime = utime * CLOCKS_PER_SEC / 1000000;
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buf->tms_stime = buf->tms_cstime = buf->tms_cutime = 0;
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return buf->tms_utime;
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}
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