src/system/libroot/posix/unistd/sleep.c

   1 /*
   2 ** Copyright 2001, Manuel J. Petit. All rights reserved.
   3 ** Distributed under the terms of the NewOS License.
   4 */
   5
   6 #include <unistd.h>
   7
   8 #include <pthread.h>
   9
  10 #include <syscalls.h>
  11
  12
  13 unsigned
  14 sleep(unsigned seconds)
  15 {
  16         bigtime_t usecs;
  17         bigtime_t start;
  18         int err;
  19
  20         start = system_time();
  21
  22         usecs = 1000000;
  23         usecs *= (bigtime_t) seconds;
  24
  25         err = snooze_until(start + usecs, B_SYSTEM_TIMEBASE);
  26
  27         pthread_testcancel();
  28
  29         if (err)
  30                 return seconds - (unsigned)((system_time() - start) / 1000000);
  31
  32         return 0;
  33 }