mirror of
https://github.com/openvswitch/ovs
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c73814a3e6
Most of the timekeeping needs of OVS are simply to measure intervals, which means that it is sensitive to changes in the clock. This commit replaces the existing clocks with monotonic timers. An additional set of wall clock timers are added and used in locations that need absolute time. Bug #1858
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TIMEVAL_H
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#define TIMEVAL_H 1
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#include <time.h>
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#include "type-props.h"
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#include "util.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct pollfd;
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struct timespec;
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struct timeval;
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/* POSIX allows floating-point time_t, but we don't support it. */
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BUILD_ASSERT_DECL(TYPE_IS_INTEGER(time_t));
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/* We do try to cater to unsigned time_t, but I want to know about it if we
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* ever encounter such a platform. */
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BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
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#define TIME_MAX TYPE_MAXIMUM(time_t)
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#define TIME_MIN TYPE_MINIMUM(time_t)
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/* Interval between updates to the reported time, in ms. This should not be
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* adjusted much below 10 ms or so with the current implementation, or too
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* much time will be wasted in signal handlers and calls to clock_gettime(). */
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#define TIME_UPDATE_INTERVAL 100
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void time_init(void);
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void time_disable_restart(void);
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void time_enable_restart(void);
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void time_postfork(void);
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void time_refresh(void);
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time_t time_now(void);
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time_t time_wall(void);
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long long int time_msec(void);
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long long int time_wall_msec(void);
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void time_timespec(struct timespec *);
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void time_wall_timespec(struct timespec *);
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void time_alarm(unsigned int secs);
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int time_poll(struct pollfd *, int n_pollfds, int timeout);
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long long int timespec_to_msec(const struct timespec *);
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long long int timeval_to_msec(const struct timeval *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* timeval.h */
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