mongo/util/time_support.h

// @file time_support.h

/*    Copyright 2010 10gen 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.
 */

#pragma once

#include <ctime>
#include <boost/thread/xtime.hpp>

namespace mongo {

    inline void time_t_to_Struct(time_t t, struct tm * buf , bool local = false ) {
#if defined(_WIN32)
        if ( local )
            localtime_s( buf , &t );
        else
            gmtime_s(buf, &t);
#else
        if ( local )
            localtime_r(&t, buf);
        else
            gmtime_r(&t, buf);
#endif
    }

    // uses ISO 8601 dates without trailing Z
    // colonsOk should be false when creating filenames
    inline string terseCurrentTime(bool colonsOk=true){
        struct tm t;
        time_t_to_Struct( time(0) , &t );

        const char* fmt = (colonsOk ? "%Y-%m-%dT%H:%M:%S" : "%Y-%m-%dT%H-%M-%S");
        char buf[32];
        assert(strftime(buf, sizeof(buf), fmt, &t) == 19);
        return buf;
    }

#define MONGO_asctime _asctime_not_threadsafe_
#define asctime MONGO_asctime
#define MONGO_gmtime _gmtime_not_threadsafe_
#define gmtime MONGO_gmtime
#define MONGO_localtime _localtime_not_threadsafe_
#define localtime MONGO_localtime
#define MONGO_ctime _ctime_is_not_threadsafe_
#define ctime MONGO_ctime

#if defined(_WIN32) || defined(__sunos__)
    inline void sleepsecs(int s) {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        xt.sec += s;
        boost::thread::sleep(xt);
    }
    inline void sleepmillis(long long s) {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        xt.sec += (int)( s / 1000 );
        xt.nsec += (int)(( s % 1000 ) * 1000000);
        if ( xt.nsec >= 1000000000 ) {
            xt.nsec -= 1000000000;
            xt.sec++;
        }        
        boost::thread::sleep(xt);
    }
    inline void sleepmicros(long long s) {
        if ( s <= 0 )
            return;
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        xt.sec += (int)( s / 1000000 );
        xt.nsec += (int)(( s % 1000000 ) * 1000);
        if ( xt.nsec >= 1000000000 ) {
            xt.nsec -= 1000000000;
            xt.sec++;
        }        
        boost::thread::sleep(xt);
    }
#else
    inline void sleepsecs(int s) {
        struct timespec t;
        t.tv_sec = s;
        t.tv_nsec = 0;
        if ( nanosleep( &t , 0 ) ){
            cout << "nanosleep failed" << endl;
        }
    }
    inline void sleepmicros(long long s) {
        if ( s <= 0 )
            return;
        struct timespec t;
        t.tv_sec = (int)(s / 1000000);
        t.tv_nsec = 1000 * ( s % 1000000 );
        struct timespec out;
        if ( nanosleep( &t , &out ) ){
            cout << "nanosleep failed" << endl;
        }
    }
    inline void sleepmillis(long long s) {
        sleepmicros( s * 1000 );
    }
#endif

    // note this wraps
    inline int tdiff(unsigned told, unsigned tnew) {
        return WrappingInt::diff(tnew, told);
    }
    inline unsigned curTimeMillis() {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        unsigned t = xt.nsec / 1000000;
        return (xt.sec & 0xfffff) * 1000 + t;
    }

    inline Date_t jsTime() {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        unsigned long long t = xt.nsec / 1000000;
        return ((unsigned long long) xt.sec * 1000) + t;
    }

    inline unsigned long long curTimeMicros64() {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        unsigned long long t = xt.nsec / 1000;
        return (((unsigned long long) xt.sec) * 1000000) + t;
    }

// measures up to 1024 seconds.  or, 512 seconds with tdiff that is...
    inline unsigned curTimeMicros() {
        boost::xtime xt;
        boost::xtime_get(&xt, boost::TIME_UTC);
        unsigned t = xt.nsec / 1000;
        unsigned secs = xt.sec % 1024;
        return secs*1000000 + t;
    }

}  // namespace mongo