44 lines
1012 B
C
44 lines
1012 B
C
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#include "sysdep.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#if defined(HAVE_SELECT)
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# include <sys/types.h> /* for FD_SET and friends (BSD) */
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#if defined(HAVE_SYS_SELECT_H)
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# include <sys/select.h>
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#endif
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#endif
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#include <unistd.h>
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#include <time.h>
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#include "../c/scheme48.h"
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/* Sleep until time hisecs/losecs (return #t),
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** or until interrupted (return #f).
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**
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** We make you pass in an absolute time so that if you have to loop
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** making multiple tries to sleep due to interrupts, you don't get
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** drift.
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**
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** Posix sleep() is not too well defined. This one uses select(),
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** and is pretty straightforward.
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*/
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s48_value sleep_until(s48_value scm_when)
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{
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time_t now = time(0);
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int delta = s48_extract_integer(scm_when) - now;
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if( delta > 0 ) {
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fd_set r, w, e;
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struct timeval tv;
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tv.tv_sec = delta;
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tv.tv_usec = 0;
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FD_ZERO(&r);
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FD_ZERO(&w);
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FD_ZERO(&e);
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if( select(0, &r, &w, &e, &tv) ) return S48_FALSE; /* Lose */
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}
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return S48_TRUE; /* Win */
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}
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