/* * Copyright (C) 2005 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ // // Timer functions. // #ifndef _LIBS_UTILS_TIMERS_H #define _LIBS_UTILS_TIMERS_H #include <stdint.h> #include <sys/types.h> #include <sys/time.h> // ------------------------------------------------------------------ // C API #ifdef __cplusplus extern "C" { #endif typedef int64_t nsecs_t; // nano-seconds static inline nsecs_t seconds_to_nanoseconds(nsecs_t secs) { return secs*1000000000; } static inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs) { return secs*1000000; } static inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs) { return secs*1000; } static inline nsecs_t nanoseconds_to_seconds(nsecs_t secs) { return secs/1000000000; } static inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs) { return secs/1000000; } static inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs) { return secs/1000; } static inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);} static inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);} static inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);} static inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);} static inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);} static inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);} static inline nsecs_t seconds(nsecs_t v) { return s2ns(v); } static inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); } static inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); } enum { SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock SYSTEM_TIME_THREAD = 3 // high-resolution per-thread clock }; // return the system-time according to the specified clock #ifdef __cplusplus nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC); #else nsecs_t systemTime(int clock); #endif // def __cplusplus #ifdef __cplusplus } // extern "C" #endif // ------------------------------------------------------------------ // C++ API #ifdef __cplusplus namespace android { /* * Time the duration of something. * * Includes some timeval manipulation functions. */ class DurationTimer { public: DurationTimer() {} ~DurationTimer() {} // Start the timer. void start(); // Stop the timer. void stop(); // Get the duration in microseconds. long long durationUsecs() const; // Subtract two timevals. Returns the difference (ptv1-ptv2) in // microseconds. static long long subtractTimevals(const struct timeval* ptv1, const struct timeval* ptv2); // Add the specified amount of time to the timeval. static void addToTimeval(struct timeval* ptv, long usec); private: struct timeval mStartWhen; struct timeval mStopWhen; }; }; // android #endif // def __cplusplus #endif // _LIBS_UTILS_TIMERS_H