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authorRichard Maw <richard.maw@codethink.co.uk>2012-01-17 14:43:55 +0000
committerRichard Maw <richard.maw@codethink.co.uk>2012-01-17 14:43:55 +0000
commit2de9abc5c9d40b3c716307d67d16146f823fd554 (patch)
tree6979db67934ddc8b564150b465846a383b428ff8 /gnulib/lib/xtime.h
parent33cc1c6fda6e72a7bae1401e9b2cec495a4d3ff1 (diff)
downloadpatch-baserock/bootstrap.tar.gz
Diffstat (limited to 'gnulib/lib/xtime.h')
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-rw-r--r--gnulib/lib/xtime.h86
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diff --git a/gnulib b/gnulib
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-Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1
diff --git a/gnulib/lib/xtime.h b/gnulib/lib/xtime.h
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+/* xtime -- extended-resolution integer time stamps
+
+ Copyright (C) 2005-2006, 2009-2011 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Paul Eggert. */
+
+#ifndef XTIME_H_
+# define XTIME_H_ 1
+
+/* xtime_t is a signed type used for time stamps. It is an integer
+ type that is a count of nanoseconds -- except for obsolescent hosts
+ without sufficiently-wide integers, where it is a count of
+ seconds. */
+# if HAVE_LONG_LONG_INT
+typedef long long int xtime_t;
+# define XTIME_PRECISION 1000000000
+# else
+# include <limits.h>
+typedef long int xtime_t;
+# if LONG_MAX >> 31 >> 31 == 0
+# define XTIME_PRECISION 1
+# else
+# define XTIME_PRECISION 1000000000
+# endif
+# endif
+
+/* Return an extended time value that contains S seconds and NS
+ nanoseconds, without any overflow checking. */
+static inline xtime_t
+xtime_make (xtime_t s, long int ns)
+{
+ if (XTIME_PRECISION == 1)
+ return s;
+ else
+ return XTIME_PRECISION * s + ns;
+}
+
+/* Return the number of seconds in T, which must be nonnegative. */
+static inline xtime_t
+xtime_nonnegative_sec (xtime_t t)
+{
+ return t / XTIME_PRECISION;
+}
+
+/* Return the number of seconds in T. */
+static inline xtime_t
+xtime_sec (xtime_t t)
+{
+ return (XTIME_PRECISION == 1
+ ? t
+ : t < 0
+ ? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
+ : xtime_nonnegative_sec (t));
+}
+
+/* Return the number of nanoseconds in T, which must be nonnegative. */
+static inline long int
+xtime_nonnegative_nsec (xtime_t t)
+{
+ return t % XTIME_PRECISION;
+}
+
+/* Return the number of nanoseconds in T. */
+static inline long int
+xtime_nsec (xtime_t t)
+{
+ long int ns = t % XTIME_PRECISION;
+ if (ns < 0)
+ ns += XTIME_PRECISION;
+ return ns;
+}
+
+#endif