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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
// Timer functions.
#include <stdint.h>
#include <sys/types.h>
#include <sys/time.h>
// ------------------------------------------------------------------
// C API
#ifdef __cplusplus
extern "C" {
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
SYSTEM_TIME_BOOTTIME = 4 // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time
// return the system-time according to the specified clock
#ifdef __cplusplus
nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC);
nsecs_t systemTime(int clock);
#endif // def __cplusplus
* Returns the number of milliseconds to wait between the reference time and the timeout time.
* If the timeout is in the past relative to the reference time, returns 0.
* If the timeout is more than INT_MAX milliseconds in the future relative to the reference time,
* such as when timeoutTime == LLONG_MAX, returns -1 to indicate an infinite timeout delay.
* Otherwise, returns the difference between the reference time and timeout time
* rounded up to the next millisecond.
int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime);
#ifdef __cplusplus
} // extern "C"
// ------------------------------------------------------------------
// C++ API
#ifdef __cplusplus
namespace android {
* Time the duration of something.
* Includes some timeval manipulation functions.
class DurationTimer {
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);
struct timeval mStartWhen;
struct timeval mStopWhen;
}; // android
#endif // def __cplusplus