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145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief Time-related functions and macros
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*/
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#ifndef _ASTERISK_TIME_H
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#define _ASTERISK_TIME_H
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#include <sys/time.h>
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#include <stdlib.h>
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#include "asterisk/inline_api.h"
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/* We have to let the compiler learn what types to use for the elements of a
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struct timeval since on linux, it's time_t and suseconds_t, but on *BSD,
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they are just a long. */
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extern struct timeval tv;
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typedef typeof(tv.tv_sec) ast_time_t;
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typedef typeof(tv.tv_usec) ast_suseconds_t;
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/*!
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* \brief Computes the difference (in milliseconds) between two \c struct \c timeval instances.
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* \param end end of the time period
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* \param start beginning of the time period
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* \return the difference in milliseconds
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*/
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AST_INLINE_API(
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int ast_tvdiff_ms(struct timeval end, struct timeval start),
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{
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/* the offset by 1,000,000 below is intentional...
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it avoids differences in the way that division
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is handled for positive and negative numbers, by ensuring
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that the divisor is always positive
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*/
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return ((end.tv_sec - start.tv_sec) * 1000) +
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(((1000000 + end.tv_usec - start.tv_usec) / 1000) - 1000);
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}
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)
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/*!
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* \brief Returns true if the argument is 0,0
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*/
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AST_INLINE_API(
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int ast_tvzero(const struct timeval t),
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{
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return (t.tv_sec == 0 && t.tv_usec == 0);
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}
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)
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/*!
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* \brief Compres two \c struct \c timeval instances returning
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* -1, 0, 1 if the first arg is smaller, equal or greater to the second.
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*/
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AST_INLINE_API(
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int ast_tvcmp(struct timeval _a, struct timeval _b),
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{
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if (_a.tv_sec < _b.tv_sec)
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return -1;
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if (_a.tv_sec > _b.tv_sec)
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return 1;
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/* now seconds are equal */
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if (_a.tv_usec < _b.tv_usec)
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return -1;
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if (_a.tv_usec > _b.tv_usec)
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return 1;
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return 0;
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}
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)
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/*!
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* \brief Returns true if the two \c struct \c timeval arguments are equal.
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*/
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AST_INLINE_API(
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int ast_tveq(struct timeval _a, struct timeval _b),
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{
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return (_a.tv_sec == _b.tv_sec && _a.tv_usec == _b.tv_usec);
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}
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)
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/*!
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* \brief Returns current timeval. Meant to replace calls to gettimeofday().
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*/
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AST_INLINE_API(
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struct timeval ast_tvnow(void),
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{
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struct timeval t;
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gettimeofday(&t, NULL);
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return t;
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}
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)
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/*!
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* \brief Returns the sum of two timevals a + b
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*/
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struct timeval ast_tvadd(struct timeval a, struct timeval b);
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/*!
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* \brief Returns the difference of two timevals a - b
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*/
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struct timeval ast_tvsub(struct timeval a, struct timeval b);
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/*!
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* \brief Returns a timeval from sec, usec
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*/
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AST_INLINE_API(
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struct timeval ast_tv(ast_time_t sec, ast_suseconds_t usec),
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{
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struct timeval t;
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t.tv_sec = sec;
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t.tv_usec = usec;
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return t;
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}
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)
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/*!
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* \brief Returns a timeval corresponding to the duration of n samples at rate r.
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* Useful to convert samples to timevals, or even milliseconds to timevals
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* in the form ast_samp2tv(milliseconds, 1000)
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*/
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AST_INLINE_API(
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struct timeval ast_samp2tv(unsigned int _nsamp, unsigned int _rate),
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{
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return ast_tv(_nsamp / _rate, ((_nsamp % _rate) * (4000000 / _rate)) / 4); /* this calculation is accurate up to 32000Hz. */
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}
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)
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#endif /* _ASTERISK_TIME_H */
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