49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
#include "sysdep.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#if defined(HAVE_SELECT)
|
|
# include <sys/types.h> /* for FD_SET and friends (BSD) */
|
|
#if defined(HAVE_SYS_SELECT_H)
|
|
# include <sys/select.h>
|
|
#endif
|
|
#endif
|
|
#include <unistd.h>
|
|
#include <time.h>
|
|
#include "../scheme48.h"
|
|
|
|
/* Sux because it's dependent on 32-bitness. */
|
|
#define hi8(i) (((i)>>24) & 0xff)
|
|
#define lo24(i) ((i) & 0xffffff)
|
|
#define comp8_24(hi, lo) (((hi)<<24) + (lo))
|
|
|
|
/* Sleep until time hisecs/losecs (return #t),
|
|
** or until interrupted (return #f).
|
|
**
|
|
** We make you pass in an absolute time so that if you have to loop
|
|
** making multiple tries to sleep due to interrupts, you don't get
|
|
** drift.
|
|
**
|
|
** Posix sleep() is not too well defined. This one uses select(),
|
|
** and is pretty straightforward.
|
|
*/
|
|
|
|
scheme_value sleep_until(int hisecs, int losecs)
|
|
{
|
|
time_t when = comp8_24(hisecs, losecs);
|
|
time_t now = time(0);
|
|
int delta = when - now;
|
|
if( delta > 0 ) {
|
|
fd_set r, w, e;
|
|
struct timeval tv;
|
|
tv.tv_sec = delta;
|
|
tv.tv_usec = 0;
|
|
FD_ZERO(&r);
|
|
FD_ZERO(&w);
|
|
FD_ZERO(&e);
|
|
if( select(0, &r, &w, &e, &tv) ) return SCHFALSE; /* Lose */
|
|
}
|
|
return SCHTRUE; /* Win */
|
|
}
|
|
|