39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/* OS-dependent support for fine-grained timer.
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** Copyright (c) 1995 by Olin Shivers.
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**
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** We return the current time in seconds and sub-second "ticks" where the
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** number of ticks/second is OS dependent (and is defined in time_dep.scm).
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** This definition works on any BSD Unix with the gettimeofday()
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** microsecond-resolution timer.
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*/
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#include <errno.h>
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#include <sys/time.h>
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#include "scheme48.h"
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#include "../time1.h"
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/* Sux because it's dependent on 32-bitness. */
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#define hi8(i) (((i)>>24) & 0xff)
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#define lo24(i) ((i) & 0xffffff)
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#define comp8_24(hi, lo) (((hi)<<24) + (lo))
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scheme_value time_plus_ticks(int *hi_secs, int *lo_secs,
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int *hi_ticks, int *lo_ticks)
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{
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struct timeval t;
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struct timezone tz;
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if( gettimeofday(&t, &tz) ) return ENTER_FIXNUM(errno);
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{ long int secs = t.tv_sec;
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long int ticks = t.tv_usec;
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*hi_secs = hi8(secs);
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*lo_secs = lo24(secs);
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*hi_ticks = hi8(ticks);
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*lo_ticks = lo24(ticks);
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}
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return SCHFALSE;
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}
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