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 // ------------------------------------------------------------------ 28 // C API 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 typedef int64_t nsecs_t; // nano-seconds 35 seconds_to_nanoseconds(nsecs_t secs)36static inline nsecs_t seconds_to_nanoseconds(nsecs_t secs) 37 { 38 return secs*1000000000; 39 } 40 milliseconds_to_nanoseconds(nsecs_t secs)41static inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs) 42 { 43 return secs*1000000; 44 } 45 microseconds_to_nanoseconds(nsecs_t secs)46static inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs) 47 { 48 return secs*1000; 49 } 50 nanoseconds_to_seconds(nsecs_t secs)51static inline nsecs_t nanoseconds_to_seconds(nsecs_t secs) 52 { 53 return secs/1000000000; 54 } 55 nanoseconds_to_milliseconds(nsecs_t secs)56static inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs) 57 { 58 return secs/1000000; 59 } 60 nanoseconds_to_microseconds(nsecs_t secs)61static inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs) 62 { 63 return secs/1000; 64 } 65 s2ns(nsecs_t v)66static inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);} ms2ns(nsecs_t v)67static inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);} us2ns(nsecs_t v)68static inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);} ns2s(nsecs_t v)69static inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);} ns2ms(nsecs_t v)70static inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);} ns2us(nsecs_t v)71static inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);} 72 seconds(nsecs_t v)73static inline nsecs_t seconds(nsecs_t v) { return s2ns(v); } milliseconds(nsecs_t v)74static inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); } microseconds(nsecs_t v)75static inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); } 76 77 enum { 78 SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock 79 SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point 80 SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock 81 SYSTEM_TIME_THREAD = 3 // high-resolution per-thread clock 82 }; 83 84 // return the system-time according to the specified clock 85 #ifdef __cplusplus 86 nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC); 87 #else 88 nsecs_t systemTime(int clock); 89 #endif // def __cplusplus 90 91 #ifdef __cplusplus 92 } // extern "C" 93 #endif 94 95 // ------------------------------------------------------------------ 96 // C++ API 97 98 #ifdef __cplusplus 99 100 namespace android { 101 /* 102 * Time the duration of something. 103 * 104 * Includes some timeval manipulation functions. 105 */ 106 class DurationTimer { 107 public: DurationTimer()108 DurationTimer() {} ~DurationTimer()109 ~DurationTimer() {} 110 111 // Start the timer. 112 void start(); 113 // Stop the timer. 114 void stop(); 115 // Get the duration in microseconds. 116 long long durationUsecs() const; 117 118 // Subtract two timevals. Returns the difference (ptv1-ptv2) in 119 // microseconds. 120 static long long subtractTimevals(const struct timeval* ptv1, 121 const struct timeval* ptv2); 122 123 // Add the specified amount of time to the timeval. 124 static void addToTimeval(struct timeval* ptv, long usec); 125 126 private: 127 struct timeval mStartWhen; 128 struct timeval mStopWhen; 129 }; 130 131 }; // android 132 #endif // def __cplusplus 133 134 #endif // _LIBS_UTILS_TIMERS_H 135