Ben Pfaff
a837a38209
Checking the current time only when a periodic timer expires allows us to reduce the number of system calls to obtain the current time to 10 per second (from an arbitrary number) plus one per poll loop. This fixes poll_block() to properly handle being interrupted. Otherwise, a timeout longer than the interval between signals will never complete (because it will restart from the beginning after every signal).
67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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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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struct pollfd;
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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 time reported by time_gettimeofday(), in ms.
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* This should not be adjusted much below 10 ms or so with the current
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* implementation, or too much time will be wasted in signal handlers and calls
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* to time(0). */
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#define TIME_UPDATE_INTERVAL 100
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void time_init(void);
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void time_refresh(void);
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time_t time_now(void);
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long long int time_msec(void);
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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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#endif /* timeval.h */
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