76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* Pausing execution of the current thread.
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Copyright (C) 2009-2025 Free Software Foundation, Inc.
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Written by Eric Blake <ebb9@byu.net>, 2009.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* This file is _intentionally_ light-weight. Rather than using
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select or nanosleep, both of which drag in external libraries on
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some platforms, this merely rounds up to the nearest second if
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usleep() does not exist. If sub-second resolution is important,
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then use a more powerful interface to begin with. */
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#include <config.h>
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/* Specification. */
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#include <unistd.h>
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#include <errno.h>
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#if defined _WIN32 && ! defined __CYGWIN__
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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#endif
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#ifndef HAVE_USLEEP
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# define HAVE_USLEEP 0
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#endif
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/* Sleep for MICRO microseconds, which can be greater than 1 second.
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Return -1 and set errno to EINVAL on range error (about 4295
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seconds), or 0 on success. Interaction with SIGALARM is
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unspecified. */
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int
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usleep (useconds_t micro)
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#undef usleep
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{
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#if defined _WIN32 && ! defined __CYGWIN__
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unsigned int milliseconds = micro / 1000;
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if (sizeof milliseconds < sizeof micro && micro / 1000 != milliseconds)
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{
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errno = EINVAL;
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return -1;
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}
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if (micro % 1000)
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milliseconds++;
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Sleep (milliseconds);
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return 0;
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#else
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unsigned int seconds = micro / 1000000;
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if (sizeof seconds < sizeof micro && micro / 1000000 != seconds)
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{
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errno = EINVAL;
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return -1;
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}
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if (!HAVE_USLEEP && micro % 1000000)
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seconds++;
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while ((seconds = sleep (seconds)) != 0);
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# if !HAVE_USLEEP
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# define usleep(x) 0
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# endif
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return usleep (micro % 1000000);
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#endif
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}
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