/* Provide a replacement for the POSIX nanosleep function.
- Copyright (C) 1999-2000, 2002, 2004-2010 Free Software Foundation, Inc.
+ Copyright (C) 1999-2000, 2002, 2004-2012 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering
- and Bruno Haible for the Woe32 part */
+ and Bruno Haible for the native Windows part */
#include <config.h>
int
nanosleep (const struct timespec *requested_delay,
struct timespec *remaining_delay)
-#undef nanosleep
+# undef nanosleep
{
- /* nanosleep mishandles large sleeps due to internal overflow
- problems. The worst known case of this is cygwin 1.5.x, which
- can't sleep more than 49.7 days (2**32 milliseconds). Solve this
- by breaking the sleep up into smaller chunks. Verify that time_t
- is large enough. */
- verify (TYPE_MAXIMUM (time_t) / 49 / 24 / 60 / 60);
- const time_t limit = 49 * 24 * 60 * 60;
- time_t seconds = requested_delay->tv_sec;
- struct timespec intermediate;
- intermediate.tv_nsec = 0;
-
- while (limit < seconds)
+ /* nanosleep mishandles large sleeps due to internal overflow problems.
+ The worst known case of this is Linux 2.6.9 with glibc 2.3.4, which
+ can't sleep more than 24.85 days (2^31 milliseconds). Similarly,
+ cygwin 1.5.x, which can't sleep more than 49.7 days (2^32 milliseconds).
+ Solve this by breaking the sleep up into smaller chunks. */
+
+ if (requested_delay->tv_nsec < 0 || BILLION <= requested_delay->tv_nsec)
{
- int result;
- intermediate.tv_sec = limit;
- result = nanosleep (&intermediate, remaining_delay);
- seconds -= limit;
- if (result)
- {
- if (remaining_delay)
- {
- remaining_delay->tv_sec += seconds;
- remaining_delay->tv_nsec += requested_delay->tv_nsec;
- if (BILLION <= requested_delay->tv_nsec)
- {
- remaining_delay->tv_sec++;
- remaining_delay->tv_nsec -= BILLION;
- }
- }
- return result;
- }
+ errno = EINVAL;
+ return -1;
}
- intermediate.tv_sec = seconds;
- intermediate.tv_nsec = requested_delay->tv_nsec;
- return nanosleep (&intermediate, remaining_delay);
+
+ {
+ /* Verify that time_t is large enough. */
+ verify (TYPE_MAXIMUM (time_t) / 24 / 24 / 60 / 60);
+ const time_t limit = 24 * 24 * 60 * 60;
+ time_t seconds = requested_delay->tv_sec;
+ struct timespec intermediate;
+ intermediate.tv_nsec = requested_delay->tv_nsec;
+
+ while (limit < seconds)
+ {
+ int result;
+ intermediate.tv_sec = limit;
+ result = nanosleep (&intermediate, remaining_delay);
+ seconds -= limit;
+ if (result)
+ {
+ if (remaining_delay)
+ remaining_delay->tv_sec += seconds;
+ return result;
+ }
+ intermediate.tv_nsec = 0;
+ }
+ intermediate.tv_sec = seconds;
+ return nanosleep (&intermediate, remaining_delay);
+ }
}
#elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
-/* Windows platforms. */
+/* Native Windows platforms. */
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
-/* The Win32 function Sleep() has a resolution of about 15 ms and takes
+/* The Windows API function Sleep() has a resolution of about 15 ms and takes
at least 5 ms to execute. We use this function for longer time periods.
Additionally, we use busy-looping over short time periods, to get a
resolution of about 0.01 ms. In order to measure such short timespans,
tv_delay.tv_usec = (ts_delay->tv_nsec + 999) / 1000;
if (tv_delay.tv_usec == 1000000)
{
- time_t t1 = tv_delay.tv_sec + 1;
- if (t1 < tv_delay.tv_sec)
+ if (tv_delay.tv_sec == TYPE_MAXIMUM (time_t))
tv_delay.tv_usec = 1000000 - 1; /* close enough */
else
{
- tv_delay.tv_sec = t1;
+ tv_delay.tv_sec++;
tv_delay.tv_usec = 0;
}
}