sysdeps/mach/usleep.c

   1 /* Copyright (C) 1992-2022 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <mach.h>
  20 #include <sys/time.h>
  21 #include <unistd.h>
  22 #include <sysdep-cancel.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   int cancel_oldtype;
  30   mach_msg_timeout_t timeout = useconds / 1000 + (useconds % 1000 != 0);
  31
  32   recv = __mach_reply_port ();
  33
  34   cancel_oldtype = LIBC_CANCEL_ASYNC();
  35   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
  36                      0, 0, recv, timeout, MACH_PORT_NULL);
  37   LIBC_CANCEL_RESET (cancel_oldtype);
  38   __mach_port_destroy (mach_task_self (), recv);
  39
  40   return 0;
  41 }