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7f97c7ea9a
As we start refactoring the code to break dependencies (see doc/refactoring.txt), I want us to use full paths in the includes (eg, #include "base/data-struct/list.h"). This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in metadata/ from base/
179 lines
3.5 KiB
C
179 lines
3.5 KiB
C
/*
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* Copyright (C) 2006 Rackable Systems All rights reserved.
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* Copyright (C) 2015 Red Hat, Inc. All rights reserved.
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*
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* This file is part of the device-mapper userspace tools.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Abstract out the time methods used so they can be adjusted later -
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* the results of these routines should stay in-core.
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*/
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#include "libdm/misc/dmlib.h"
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#include <stdlib.h>
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#define NSEC_PER_USEC UINT64_C(1000)
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#define NSEC_PER_MSEC UINT64_C(1000000)
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#define NSEC_PER_SEC UINT64_C(1000000000)
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/*
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* The realtime section uses clock_gettime with the CLOCK_MONOTONIC
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* parameter to prevent issues with time warps
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* This implementation requires librt.
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*/
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#ifdef HAVE_REALTIME
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#include <time.h>
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struct dm_timestamp {
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struct timespec t;
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};
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static uint64_t _timestamp_to_uint64(struct dm_timestamp *ts)
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{
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uint64_t stamp = 0;
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stamp += (uint64_t) ts->t.tv_sec * NSEC_PER_SEC;
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stamp += (uint64_t) ts->t.tv_nsec;
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return stamp;
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}
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struct dm_timestamp *dm_timestamp_alloc(void)
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{
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struct dm_timestamp *ts = NULL;
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if (!(ts = dm_zalloc(sizeof(*ts))))
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stack;
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return ts;
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}
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int dm_timestamp_get(struct dm_timestamp *ts)
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{
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if (!ts)
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return 0;
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if (clock_gettime(CLOCK_MONOTONIC, &ts->t)) {
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log_sys_error("clock_gettime", "get_timestamp");
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ts->t.tv_sec = 0;
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ts->t.tv_nsec = 0;
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return 0;
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}
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return 1;
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}
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#else /* ! HAVE_REALTIME */
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/*
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* The !realtime section just uses gettimeofday and is therefore subject
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* to ntp-type time warps - not sure if should allow that.
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*/
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#include <sys/time.h>
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struct dm_timestamp {
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struct timeval t;
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};
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static uint64_t _timestamp_to_uint64(struct dm_timestamp *ts)
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{
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uint64_t stamp = 0;
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stamp += ts->t.tv_sec * NSEC_PER_SEC;
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stamp += ts->t.tv_usec * NSEC_PER_USEC;
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return stamp;
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}
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struct dm_timestamp *dm_timestamp_alloc(void)
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{
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struct dm_timestamp *ts;
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if (!(ts = dm_malloc(sizeof(*ts))))
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stack;
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return ts;
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}
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int dm_timestamp_get(struct dm_timestamp *ts)
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{
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if (!ts)
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return 0;
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if (gettimeofday(&ts->t, NULL)) {
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log_sys_error("gettimeofday", "get_timestamp");
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ts->t.tv_sec = 0;
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ts->t.tv_usec = 0;
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return 0;
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}
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return 1;
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}
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#endif /* HAVE_REALTIME */
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/*
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* Compare two timestamps.
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*
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* Return: -1 if ts1 is less than ts2
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* 0 if ts1 is equal to ts2
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* 1 if ts1 is greater than ts2
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*/
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int dm_timestamp_compare(struct dm_timestamp *ts1, struct dm_timestamp *ts2)
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{
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uint64_t t1, t2;
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t1 = _timestamp_to_uint64(ts1);
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t2 = _timestamp_to_uint64(ts2);
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if (t2 < t1)
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return 1;
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if (t1 < t2)
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return -1;
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return 0;
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}
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/*
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* Return the absolute difference in nanoseconds between
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* the dm_timestamp objects ts1 and ts2.
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*
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* Callers that need to know whether ts1 is before, equal to, or after ts2
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* in addition to the magnitude should use dm_timestamp_compare.
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*/
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uint64_t dm_timestamp_delta(struct dm_timestamp *ts1, struct dm_timestamp *ts2)
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{
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uint64_t t1, t2;
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t1 = _timestamp_to_uint64(ts1);
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t2 = _timestamp_to_uint64(ts2);
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if (t1 > t2)
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return t1 - t2;
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return t2 - t1;
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}
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void dm_timestamp_copy(struct dm_timestamp *ts_new, struct dm_timestamp *ts_old)
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{
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*ts_new = *ts_old;
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}
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void dm_timestamp_destroy(struct dm_timestamp *ts)
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{
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dm_free(ts);
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}
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