1/* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17// 18// Timer functions. 19// 20#ifndef _LIBS_UTILS_TIMERS_H 21#define _LIBS_UTILS_TIMERS_H 22 23#include <stdint.h> 24#include <sys/types.h> 25#include <sys/time.h> 26 27#include <utils/Compat.h> 28 29// ------------------------------------------------------------------ 30// C API 31 32#ifdef __cplusplus 33extern "C" { 34#endif 35 36typedef int64_t nsecs_t; // nano-seconds 37 38static CONSTEXPR inline nsecs_t seconds_to_nanoseconds(nsecs_t secs) 39{ 40 return secs*1000000000; 41} 42 43static CONSTEXPR inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs) 44{ 45 return secs*1000000; 46} 47 48static CONSTEXPR inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs) 49{ 50 return secs*1000; 51} 52 53static CONSTEXPR inline nsecs_t nanoseconds_to_seconds(nsecs_t secs) 54{ 55 return secs/1000000000; 56} 57 58static CONSTEXPR inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs) 59{ 60 return secs/1000000; 61} 62 63static CONSTEXPR inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs) 64{ 65 return secs/1000; 66} 67 68static CONSTEXPR inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);} 69static CONSTEXPR inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);} 70static CONSTEXPR inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);} 71static CONSTEXPR inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);} 72static CONSTEXPR inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);} 73static CONSTEXPR inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);} 74 75static CONSTEXPR inline nsecs_t seconds(nsecs_t v) { return s2ns(v); } 76static CONSTEXPR inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); } 77static CONSTEXPR inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); } 78 79enum { 80 SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock 81 SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point 82 SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock 83 SYSTEM_TIME_THREAD = 3, // high-resolution per-thread clock 84 SYSTEM_TIME_BOOTTIME = 4 // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time 85}; 86 87// return the system-time according to the specified clock 88#ifdef __cplusplus 89nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC); 90#else 91nsecs_t systemTime(int clock); 92#endif // def __cplusplus 93 94/** 95 * Returns the number of milliseconds to wait between the reference time and the timeout time. 96 * If the timeout is in the past relative to the reference time, returns 0. 97 * If the timeout is more than INT_MAX milliseconds in the future relative to the reference time, 98 * such as when timeoutTime == LLONG_MAX, returns -1 to indicate an infinite timeout delay. 99 * Otherwise, returns the difference between the reference time and timeout time 100 * rounded up to the next millisecond. 101 */ 102int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime); 103 104#ifdef __cplusplus 105} // extern "C" 106#endif 107 108#endif // _LIBS_UTILS_TIMERS_H 109