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44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
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/* Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <mach.h>
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#include <sys/time.h>
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/* Sleep USECONDS microseconds, or until a previously set timer goes off. */
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unsigned int
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DEFUN(usleep, (useconds), unsigned int useconds)
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{
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mach_port_t recv;
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struct timeval before, after;
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recv = __mach_reply_port ();
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if (__gettimeofday (&before, NULL) < 0)
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return useconds;
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(void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
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0, 0, recv, (useconds + 999) / 1000, MACH_PORT_NULL);
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__mach_port_destroy (mach_task_self (), recv);
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if (__gettimeofday (&after, NULL) < 0)
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return 0;
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return useconds - (((after.tv_sec - before.tv_sec) * 1000000) +
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(after.tv_usec - before.tv_usec));
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}
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