sysdeps/mach/usleep.c

   1 /* Copyright (C) 1992, 93, 94, 97, 98, 99, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <mach.h>
  21 #include <sys/time.h>
  22 #include <unistd.h>
  23
  24 /* Sleep USECONDS microseconds, or until a previously set timer goes off.  */
  25 int
  26 usleep (useconds_t useconds)
  27 {
  28   mach_port_t recv;
  29   struct timeval before, after;
  30
  31   recv = __mach_reply_port ();
  32
  33   if (__gettimeofday (&before, NULL) < 0)
  34     return -1;
  35   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
  36                      0, 0, recv, (useconds + 999) / 1000, MACH_PORT_NULL);
  37   __mach_port_destroy (mach_task_self (), recv);
  38   if (__gettimeofday (&after, NULL) < 0)
  39     return -1;
  40
  41   return 0;
  42 }