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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2011-2012 Couchbase, Inc.
*
* 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.
*/
#include "config.h"
#include "settings.h"
#include <libcouchbase/couchbase.h>
#ifndef HAVE_GETHRTIME
#include <stdlib.h>
#include <time.h>
#if defined(__MACH__) && defined(__APPLE__)
#include <mach/mach_time.h>
#endif
#ifdef __linux__
#undef HAVE_CLOCK_GETTIME
#define HAVE_CLOCK_GETTIME 1
#endif
#define CLOCK_START_OFFSET (LCB_S2NS(3600 * 24))
hrtime_t gethrtime(void)
{
#ifdef __APPLE__
/* Most things expect a pretty large timestamp - even though a smaller one
* may be perfectly valid. Initialize the default with an offset of one day,
* in nanoseconds
*/
/* Use the various mach stuff:
* https://developer.apple.com/library/mac/qa/qa1398/_index.html */
static uint64_t start = 0;
uint64_t now ;
static mach_timebase_info_data_t tmbi;
if (start == 0) {
start = mach_absolute_time();
mach_timebase_info(&tmbi);
}
now = mach_absolute_time();
return ((now - start) * tmbi.numer / tmbi.denom) + CLOCK_START_OFFSET;
#elif defined(HAVE_CLOCK_GETTIME)
struct timespec tm;
lcb_assert(clock_gettime(CLOCK_MONOTONIC, &tm) != -1);
return (((hrtime_t)tm.tv_sec) * 1000000000) + (hrtime_t)tm.tv_nsec;
#elif defined(HAVE_GETTIMEOFDAY)
hrtime_t ret;
struct timeval tv;
if (gettimeofday(&tv, NULL) == -1) {
return -1;
}
ret = (hrtime_t)tv.tv_sec * 1000000000;
ret += (hrtime_t)tv.tv_usec * 1000;
return ret;
#elif defined(HAVE_QUERYPERFORMANCECOUNTER)
double ret;
// To fix the potential race condition for the local static variable,
// gethrtime should be called in a global static variable first.
// It will guarantee the local static variable will be initialized
// before any thread calls the function.
static LARGE_INTEGER pf = { 0 };
static double freq;
LARGE_INTEGER currtime;
if (pf.QuadPart == 0) {
lcb_assert(QueryPerformanceFrequency(&pf));
lcb_assert(pf.QuadPart != 0);
freq = 1.0e9 / (double)pf.QuadPart;
}
QueryPerformanceCounter(&currtime);
ret = (double)currtime.QuadPart * freq ;
return (hrtime_t)ret + CLOCK_START_OFFSET;
#else
#error "I don't know how to build a highres clock..."
#endif
}
#endif /* HAVE_GETHRTIME */
/* Symbol usable so other subsystems can get the same idea of time the library
* has. This will also allow us to stop shipping the 'gethrtime' file around.
*/
LCB_INTERNAL_API
lcb_U64 lcb_nstime(void) {
return gethrtime();
}