1 #ifndef footimevalhfoo 2 #define footimevalhfoo 3 4 /* $Id: timeval.h 1971 2007-10-28 19:13:50Z lennart $ */ 5 6 /*** 7 This file is part of PulseAudio. 8 9 Copyright 2004-2006 Lennart Poettering 10 Copyright 2006 Pierre Ossman <ossman (at) cendio.se> for Cendio AB 11 12 PulseAudio is free software; you can redistribute it and/or modify 13 it under the terms of the GNU Lesser General Public License as 14 published by the Free Software Foundation; either version 2.1 of the 15 License, or (at your option) any later version. 16 17 PulseAudio is distributed in the hope that it will be useful, but 18 WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 Lesser General Public License for more details. 21 22 You should have received a copy of the GNU Lesser General Public 23 License along with PulseAudio; if not, write to the Free Software 24 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 25 USA. 26 ***/ 27 28 #include <pulse/cdecl.h> 29 #include <pulse/sample.h> 30 31 /** \file 32 * Utility functions for handling timeval calculations */ 33 34 PA_C_DECL_BEGIN 35 36 #define PA_MSEC_PER_SEC 1000 37 #define PA_USEC_PER_SEC 1000000 38 #define PA_NSEC_PER_SEC 1000000000 39 #define PA_USEC_PER_MSEC 1000 40 41 struct timeval; 42 43 /** Return the current timestamp, just like UNIX gettimeofday() */ 44 struct timeval *pa_gettimeofday(struct timeval *tv); 45 46 /** Calculate the difference between the two specified timeval 47 * structs. */ 48 pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) PA_GCC_PURE; 49 50 /** Compare the two timeval structs and return 0 when equal, negative when a < b, positive otherwse */ 51 int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) PA_GCC_PURE; 52 53 /** Return the time difference between now and the specified timestamp */ 54 pa_usec_t pa_timeval_age(const struct timeval *tv); 55 56 /** Add the specified time inmicroseconds to the specified timeval structure */ 57 struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v) PA_GCC_PURE; 58 59 /** Store the specified uec value in the timeval struct. \since 0.9.7 */ 60 struct timeval* pa_timeval_store(struct timeval *tv, pa_usec_t v); 61 62 /** Load the specified tv value and return it in usec. \since 0.9.7 */ 63 pa_usec_t pa_timeval_load(const struct timeval *tv); 64 65 PA_C_DECL_END 66 67 #endif 68
