| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program 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. |
| * |
| * 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 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 program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * libcfs/include/libcfs/libcfs_time.h |
| * |
| * Time functions. |
| * |
| */ |
| |
| #ifndef __LIBCFS_TIME_H__ |
| #define __LIBCFS_TIME_H__ |
| /* |
| * generic time manipulation functions. |
| */ |
| |
| static inline cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d) |
| { |
| return (cfs_time_t)(t + d); |
| } |
| |
| static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2) |
| { |
| return (cfs_time_t)(t1 - t2); |
| } |
| |
| static inline int cfs_time_after(cfs_time_t t1, cfs_time_t t2) |
| { |
| return cfs_time_before(t2, t1); |
| } |
| |
| static inline int cfs_time_aftereq(cfs_time_t t1, cfs_time_t t2) |
| { |
| return cfs_time_beforeq(t2, t1); |
| } |
| |
| |
| static inline cfs_time_t cfs_time_shift(int seconds) |
| { |
| return cfs_time_add(cfs_time_current(), cfs_time_seconds(seconds)); |
| } |
| |
| static inline long cfs_timeval_sub(struct timeval *large, struct timeval *small, |
| struct timeval *result) |
| { |
| long r = (long) ( |
| (large->tv_sec - small->tv_sec) * ONE_MILLION + |
| (large->tv_usec - small->tv_usec)); |
| if (result != NULL) { |
| result->tv_usec = r % ONE_MILLION; |
| result->tv_sec = r / ONE_MILLION; |
| } |
| return r; |
| } |
| |
| static inline void cfs_slow_warning(cfs_time_t now, int seconds, char *msg) |
| { |
| if (cfs_time_after(cfs_time_current(), |
| cfs_time_add(now, cfs_time_seconds(15)))) |
| CERROR("slow %s "CFS_TIME_T" sec\n", msg, |
| cfs_duration_sec(cfs_time_sub(cfs_time_current(),now))); |
| } |
| |
| #define CFS_RATELIMIT(seconds) \ |
| ({ \ |
| /* \ |
| * XXX nikita: non-portable initializer \ |
| */ \ |
| static time_t __next_message = 0; \ |
| int result; \ |
| \ |
| if (cfs_time_after(cfs_time_current(), __next_message)) \ |
| result = 1; \ |
| else { \ |
| __next_message = cfs_time_shift(seconds); \ |
| result = 0; \ |
| } \ |
| result; \ |
| }) |
| |
| /* |
| * helper function similar to do_gettimeofday() of Linux kernel |
| */ |
| static inline void cfs_fs_timeval(struct timeval *tv) |
| { |
| cfs_fs_time_t time; |
| |
| cfs_fs_time_current(&time); |
| cfs_fs_time_usec(&time, tv); |
| } |
| |
| /* |
| * return valid time-out based on user supplied one. Currently we only check |
| * that time-out is not shorted than allowed. |
| */ |
| static inline cfs_duration_t cfs_timeout_cap(cfs_duration_t timeout) |
| { |
| if (timeout < CFS_TICK) |
| timeout = CFS_TICK; |
| return timeout; |
| } |
| |
| #endif |