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/*
* 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
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