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view src/dbinc/clock.h @ 0:a1985f14b030
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author | chegar |
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date | Fri, 11 May 2012 10:42:02 +0100 |
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/*- * See the file LICENSE for redistribution information. * * Copyright (c) 2005, 2012 Oracle and/or its affiliates. All rights reserved. * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * * $Id$ */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)time.h 8.5 (Berkeley) 5/4/95 * FreeBSD: src/sys/sys/time.h,v 1.65 2004/04/07 04:19:49 imp Exp */ #ifndef _DB_CLOCK_H_ #define _DB_CLOCK_H_ #if defined(__cplusplus) extern "C" { #endif /* * This declaration is POSIX-compatible. Because there are lots of different * time.h include file patterns out there, it's easier to declare our own name * in all cases than to try and discover if a system has a struct timespec. * For the same reason, and because we'd have to #include <sys/time.h> in db.h, * we don't export any timespec structures in the DB API, even in places where * it would make sense, like the replication statistics information. */ typedef struct { time_t tv_sec; /* seconds */ #ifdef HAVE_MIXED_SIZE_ADDRESSING int32_t tv_nsec; #else long tv_nsec; /* nanoseconds */ #endif } db_timespec; /* Operations on timespecs */ #undef timespecclear #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0) #undef timespecisset #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec) #undef timespeccmp #define timespeccmp(tvp, uvp, cmp) \ (((tvp)->tv_sec == (uvp)->tv_sec) ? \ ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \ ((tvp)->tv_sec cmp (uvp)->tv_sec)) #undef timespecadd /* * Note that using timespecadd to add to yourself (i.e. doubling) * must be supported. */ #define timespecadd(vvp, uvp) \ do { \ (vvp)->tv_sec += (uvp)->tv_sec; \ (vvp)->tv_nsec += (uvp)->tv_nsec; \ if ((vvp)->tv_nsec >= 1000000000) { \ (vvp)->tv_sec++; \ (vvp)->tv_nsec -= 1000000000; \ } \ } while (0) #undef timespecsub #define timespecsub(vvp, uvp) \ do { \ (vvp)->tv_sec -= (uvp)->tv_sec; \ (vvp)->tv_nsec -= (uvp)->tv_nsec; \ if ((vvp)->tv_nsec < 0) { \ (vvp)->tv_sec--; \ (vvp)->tv_nsec += 1000000000; \ } \ } while (0) #undef timespecset #define timespecset(vvp, sec, nsec) \ do { \ (vvp)->tv_sec = (time_t)(sec); \ (vvp)->tv_nsec = (long)(nsec); \ } while (0) #define DB_TIMEOUT_TO_TIMESPEC(t, vvp) \ do { \ (vvp)->tv_sec = (time_t)((t) / 1000000); \ (vvp)->tv_nsec = (long)(((t) % 1000000) * 1000); \ } while (0) #define DB_TIMESPEC_TO_TIMEOUT(t, vvp, prec) \ do { \ t = (u_long)((vvp)->tv_sec * 1000000); \ t += (u_long)((vvp)->tv_nsec / 1000); \ /* Add in 1 usec for lost nsec precision if wanted. */ \ if (prec) \ t++; \ } while (0) #define TIMESPEC_ADD_DB_TIMEOUT(vvp, t) \ do { \ db_timespec __tmp; \ DB_TIMEOUT_TO_TIMESPEC(t, &__tmp); \ timespecadd((vvp), &__tmp); \ } while (0) #if defined(__cplusplus) } #endif #endif /* !_DB_CLOCK_H_ */