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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
*
* 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.
//
#include <utils/Timers.h>
#include <limits.h>
#include <time.h>
// host linux support requires Linux 2.6.39+
#if defined(__linux__)
nsecs_t systemTime(int clock)
{
static const clockid_t clocks[] = {
CLOCK_REALTIME,
CLOCK_MONOTONIC,
CLOCK_PROCESS_CPUTIME_ID,
CLOCK_THREAD_CPUTIME_ID,
CLOCK_BOOTTIME
};
struct timespec t;
t.tv_sec = t.tv_nsec = 0;
clock_gettime(clocks[clock], &t);
return nsecs_t(t.tv_sec)*1000000000LL + t.tv_nsec;
}
#else
nsecs_t systemTime(int /*clock*/)
{
// Clock support varies widely across hosts. Mac OS doesn't support
// CLOCK_BOOTTIME, and Windows is windows.
struct timeval t;
t.tv_sec = t.tv_usec = 0;
gettimeofday(&t, nullptr);
return nsecs_t(t.tv_sec)*1000000000LL + nsecs_t(t.tv_usec)*1000LL;
}
#endif
int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
{
nsecs_t timeoutDelayMillis;
if (timeoutTime > referenceTime) {
uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
timeoutDelayMillis = -1;
} else {
timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
}
} else {
timeoutDelayMillis = 0;
}
return (int)timeoutDelayMillis;
}
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