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 33 extern "C" { 34 #endif 35 36 typedef int64_t nsecs_t; // nano-seconds 37 38 static CONSTEXPR inline nsecs_t seconds_to_nanoseconds(nsecs_t secs) 39 { 40 return secs*1000000000; 41 } 42 43 static CONSTEXPR inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs) 44 { 45 return secs*1000000; 46 } 47 48 static CONSTEXPR inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs) 49 { 50 return secs*1000; 51 } 52 53 static CONSTEXPR inline nsecs_t nanoseconds_to_seconds(nsecs_t secs) 54 { 55 return secs/1000000000; 56 } 57 58 static CONSTEXPR inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs) 59 { 60 return secs/1000000; 61 } 62 63 static CONSTEXPR inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs) 64 { 65 return secs/1000; 66 } 67 68 static CONSTEXPR inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);} 69 static CONSTEXPR inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);} 70 static CONSTEXPR inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);} 71 static CONSTEXPR inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);} 72 static CONSTEXPR inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);} 73 static CONSTEXPR inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);} 74 75 static CONSTEXPR inline nsecs_t seconds(nsecs_t v) { return s2ns(v); } 76 static CONSTEXPR inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); } 77 static CONSTEXPR inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); } 78 79 enum { 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 89 nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC); 90 #else 91 nsecs_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 */ 102 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime); 103 104 #ifdef __cplusplus 105 } // extern "C" 106 #endif 107 108 #endif // _LIBS_UTILS_TIMERS_H 109
