mytime.c

//	Copyright 2019 Huiguang Yi. All Rights Reservered.
//
//	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 <sys/time.h>
#include <time.h>

long long timeInMilliseconds(void) {
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (((long long) tv.tv_sec) * 1000) + (tv.tv_usec / 1000);
}

long long timeInMicroseconds(void) {
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (((long long) tv.tv_sec) * 1000000) + (tv.tv_usec);
}

struct timespec diff(struct timespec start, struct timespec end) {
    struct timespec temp;
    if ((end.tv_nsec - start.tv_nsec) < 0) {
        temp.tv_sec = end.tv_sec - start.tv_sec - 1;
        temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
    } else {
        temp.tv_sec = end.tv_sec - start.tv_sec;
        temp.tv_nsec = end.tv_nsec - start.tv_nsec;
    }
    return temp;
}