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40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* millisleep.c - generic millisleep function.
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* The generic implementation of these functions can be used for architectures
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* or platforms that do not have a more specialized implementation. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/misc.h>
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#include <grub/time.h>
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void
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grub_millisleep (grub_uint32_t ms)
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{
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grub_uint64_t start;
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start = grub_get_time_ms ();
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/* Instead of setting an end time and looping while the current time is
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less than that, comparing the elapsed sleep time with the desired sleep
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time handles the (unlikely!) case that the timer would wrap around
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during the sleep. */
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while (grub_get_time_ms () - start < ms)
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grub_cpu_idle ();
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}
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