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glibc  2.9
usleep.c
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00001 /* Copyright (C) 1992, 93, 94, 97, 98, 99, 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <mach.h>
00021 #include <sys/time.h>
00022 #include <unistd.h>
00023 
00024 /* Sleep USECONDS microseconds, or until a previously set timer goes off.  */
00025 int
00026 usleep (useconds_t useconds)
00027 {
00028   mach_port_t recv;
00029   struct timeval before, after;
00030 
00031   recv = __mach_reply_port ();
00032 
00033   if (__gettimeofday (&before, NULL) < 0)
00034     return -1;
00035   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
00036                    0, 0, recv, (useconds + 999) / 1000, MACH_PORT_NULL);
00037   __mach_port_destroy (mach_task_self (), recv);
00038   if (__gettimeofday (&after, NULL) < 0)
00039     return -1;
00040 
00041   return 0;
00042 }