146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Timer functions.
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//
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#ifndef _LIBS_UTILS_TIMERS_H
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#define _LIBS_UTILS_TIMERS_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/time.h>
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// ------------------------------------------------------------------
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// C API
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int64_t nsecs_t; // nano-seconds
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static inline nsecs_t seconds_to_nanoseconds(nsecs_t secs)
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{
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return secs*1000000000;
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}
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static inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs)
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{
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return secs*1000000;
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}
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static inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs)
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{
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return secs*1000;
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}
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static inline nsecs_t nanoseconds_to_seconds(nsecs_t secs)
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{
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return secs/1000000000;
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}
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static inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs)
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{
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return secs/1000000;
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}
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static inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs)
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{
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return secs/1000;
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}
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static inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);}
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static inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);}
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static inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);}
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static inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);}
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static inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);}
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static inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);}
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static inline nsecs_t seconds(nsecs_t v) { return s2ns(v); }
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static inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); }
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static inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); }
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enum {
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SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock
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SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point
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SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock
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SYSTEM_TIME_THREAD = 3, // high-resolution per-thread clock
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SYSTEM_TIME_BOOTTIME = 4 // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time
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};
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// return the system-time according to the specified clock
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#ifdef __cplusplus
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nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC);
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#else
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nsecs_t systemTime(int clock);
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#endif // def __cplusplus
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/**
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* Returns the number of milliseconds to wait between the reference time and the timeout time.
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* If the timeout is in the past relative to the reference time, returns 0.
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* If the timeout is more than INT_MAX milliseconds in the future relative to the reference time,
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* such as when timeoutTime == LLONG_MAX, returns -1 to indicate an infinite timeout delay.
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* Otherwise, returns the difference between the reference time and timeout time
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* rounded up to the next millisecond.
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*/
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int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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// ------------------------------------------------------------------
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// C++ API
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#ifdef __cplusplus
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namespace android {
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/*
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* Time the duration of something.
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*
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* Includes some timeval manipulation functions.
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*/
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class DurationTimer {
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public:
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DurationTimer() {}
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~DurationTimer() {}
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// Start the timer.
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void start();
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// Stop the timer.
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void stop();
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// Get the duration in microseconds.
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long long durationUsecs() const;
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// Subtract two timevals. Returns the difference (ptv1-ptv2) in
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// microseconds.
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static long long subtractTimevals(const struct timeval* ptv1,
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const struct timeval* ptv2);
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// Add the specified amount of time to the timeval.
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static void addToTimeval(struct timeval* ptv, long usec);
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private:
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struct timeval mStartWhen;
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struct timeval mStopWhen;
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};
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}; // android
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#endif // def __cplusplus
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#endif // _LIBS_UTILS_TIMERS_H
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