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| author | Jim Meyering <jim@meyering.net> | 2002-10-13 12:22:26 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 2002-10-13 12:22:26 +0000 |
| commit | bd9e754992a5ab5b358e563f728874bc21d4250a (patch) | |
| tree | ff789693f830fad7e5de95c304023e3cd4db51b4 /lib/xnanosleep.c | |
| parent | 5b87a606636b54f87d86fb47cc980a6c1e9dbcf9 (diff) | |
| download | coreutils-bd9e754992a5ab5b358e563f728874bc21d4250a.tar.xz | |
There's no need to futz with the rounding mode,
since the code should work properly even in the default rounding mode.
(<fenv.h>): Do not include.
(#pragma STDC FENV_ACCESS ON): Remove.
(xnanosleep): Don't futz with rounding state.
Diffstat (limited to 'lib/xnanosleep.c')
| -rw-r--r-- | lib/xnanosleep.c | 24 |
1 files changed, 4 insertions, 20 deletions
diff --git a/lib/xnanosleep.c b/lib/xnanosleep.c index 8f9eb7e25..c6acbac2f 100644 --- a/lib/xnanosleep.c +++ b/lib/xnanosleep.c @@ -54,15 +54,6 @@ #include "xnanosleep.h" #include "xstrtod.h" -#if HAVE_FENV_H -# include <fenv.h> -#endif - -/* Tell the compiler that non-default rounding modes are used. */ -#if 199901 <= __STDC_VERSION__ - #pragma STDC FENV_ACCESS ON -#endif - static int initialized = 0; /* Subtract the `struct timespec' values X and Y, @@ -138,16 +129,6 @@ xnanosleep (double seconds) assert (0 <= seconds); -#ifdef FE_UPWARD - if (! initialized) - { - /* Always round up, since we must sleep for at least the specified - interval. */ - /* FIXME: save and restore state, rather than just setting it? */ - fesetround (FE_UPWARD); - } -#endif - if (clock_get_realtime (&ts_start) == NULL) return -1; @@ -159,7 +140,10 @@ xnanosleep (double seconds) ts_sleep.tv_nsec = ns; /* Round up to the next whole number, if necessary, so that we - always sleep for at least the requested amount of time. */ + always sleep for at least the requested amount of time. Assuming + the default rounding mode, we don't have to worry about the + rounding error when computing 'ns' above, since the error won't + cause 'ns' to drop below an integer boundary. */ ts_sleep.tv_nsec += (ts_sleep.tv_nsec < ns); /* Normalize the interval length. nanosleep requires this. */ |