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 36 static inline nsecs_t seconds_to_nanoseconds(nsecs_t secs) 37 { 38 return secs*1000000000; 39 } 40 41 static inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs) 42 { 43 return secs*1000000; 44 } 45 46 static inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs) 47 { 48 return secs*1000; 49 } 50 51 static inline nsecs_t nanoseconds_to_seconds(nsecs_t secs) 52 { 53 return secs/1000000000; 54 } 55 56 static inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs) 57 { 58 return secs/1000000; 59 } 60 61 static inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs) 62 { 63 return secs/1000; 64 } 65 66 static inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);} 67 static inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);} 68 static inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);} 69 static inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);} 70 static inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);} 71 static inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);} 72 73 static inline nsecs_t seconds(nsecs_t v) { return s2ns(v); } 74 static inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); } 75 static 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 SYSTEM_TIME_BOOTTIME = 4 // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time 83 }; 84 85 // return the system-time according to the specified clock 86 #ifdef __cplusplus 87 nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC); 88 #else 89 nsecs_t systemTime(int clock); 90 #endif // def __cplusplus 91 92 /** 93 * Returns the number of milliseconds to wait between the reference time and the timeout time. 94 * If the timeout is in the past relative to the reference time, returns 0. 95 * If the timeout is more than INT_MAX milliseconds in the future relative to the reference time, 96 * such as when timeoutTime == LLONG_MAX, returns -1 to indicate an infinite timeout delay. 97 * Otherwise, returns the difference between the reference time and timeout time 98 * rounded up to the next millisecond. 99 */ 100 int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime); 101 102 #ifdef __cplusplus 103 } // extern "C" 104 #endif 105 106 #endif // _LIBS_UTILS_TIMERS_H 107
