scsh-0.6/scsh/bsd/time_dep1.c

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/* OS-dependent support for fine-grained timer.
** Copyright (c) 1995 by Olin Shivers.
**
** We return the current time in seconds and sub-second "ticks" where the
** number of ticks/second is OS dependent (and is defined in time_dep.scm).
** This definition works on any BSD Unix with the gettimeofday()
** microsecond-resolution timer.
*/
#include <errno.h>
#include <sys/time.h>
#include "scheme48.h"
#include "../time1.h"
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s48_value time_plus_ticks()
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{
struct timeval t;
struct timezone tz;
s48_value sch_tv_sec = S48_UNSPECIFIC;
s48_value sch_tv_usec = S48_UNSPECIFIC;
s48_value sch_listval = S48_UNSPECIFIC;
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s48_value sch_retval = S48_UNSPECIFIC;
S48_DECLARE_GC_PROTECT(3);
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S48_GC_PROTECT_3(sch_tv_sec, sch_tv_usec, sch_listval);
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if( gettimeofday(&t, &tz) ) s48_raise_os_error (errno);
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sch_tv_sec = s48_enter_integer(t.tv_sec);
sch_tv_usec = s48_enter_integer(t.tv_usec);
sch_listval = s48_cons (sch_tv_usec, S48_NULL);
sch_retval = s48_cons (sch_tv_sec, sch_listval);
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S48_GC_UNPROTECT();
return sch_retval;
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}