47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#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 "../scheme48.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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/* 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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scheme_value sleep_until(int hisecs, int losecs)
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{
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time_t when = comp8_24(hisecs, losecs);
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time_t now = time(0);
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int delta = 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 = { delta, 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 SCHFALSE; /* Lose */
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}
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return SCHTRUE; /* Win */
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}
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