struct timeval start, end; struct timeval结构体是在C语言中用来表示时间的数据结构。它包含了两个成员变量,分别是tv_sec和tv_usec,分别表示秒和微秒。在很多情况下,我们需要测量某段代码的执行时间或者某个事件的持续时间,这时就可以使用struct timeval结构体来记录开始时间和结束时间,然后计算时间差来得到执行时间...
以下是一个使用struct timeval进行高精度计时的简单示例代码: cpp #include <iostream> #include <sys/time.h> // 包含timeval结构体的头文件 int main() { struct timeval start, end; // 获取开始时间 gettimeofday(&start, NULL); // 模拟一些处理时间 for (volatile int i = 0; ...
int main(){ struct timeval start, end; gettimeofday( &start, NULL ); sleep(3); gettimeofday( &end, NULL ); int timeuse = 1000000 * ( end.tv_sec - start.tv_sec ) + end.tv_usec - start.tv_usec; printf("time: %d us\n", timeuse); return 0; }...
struct timeval用法 ,计算程序运行时间 #include <stdio.h> #include <stdlib.h> #include <sys/time.h> int main() { struct timeval t_start, t_end; gettimeofday(&t_start,NULL); printf("hello world\n"); gettimeofday(&t_end,NULL); printf("cost time %ldus\n", t_end.tv_usec - t_star...
#include<stdio.h>#include<stdlib.h>#include<sys/time.h>intmain(){structtimevalt_start, t_end;gettimeofday(&t_start,NULL);printf("hello world\n");gettimeofday(&t_end,NULL);printf("cost time %ldus\n", t_end.tv_usec - t_start.tv_usec);return0; ...
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struct timeval end; gettimeofday( &start, NULL ); time_t time_elapsed = 0; uint64_t bytes_sent = 0; uint64_t rate_limit = SEND_BIT_RATE; uint64_t bytes_can_send = 0; uint64_t to_send = 0; uint64_t start_time = start.tv_sec*1000000 + start.tv_usec;...
struct timeval start; struct timeval end; gettimeofday( &start, NULL ); time_t time_elapsed = 0; uint64_t bytes_sent = 0; uint64_t rate_limit = SEND_BIT_RATE; uint64_t bytes_can_send = 0; uint64_t to_send = 0; uint64_t start_time = start.tv_sec*10...
Getting problem with using struct timeval Getting STATUS_THREAD_IS_TERMINATING (0xc000004b) error on exit of program Getting the list of available serial ports in C++ Getting the PropertyData of ManagementObject in C++ GetWindowText and SetWindowText using std::wstring Given Process ID, determine ...
所以:skb->truesize = sizeof(struct sk_buff) + (head - end) + sizeof(struct skb_shared_info) + data_len。 1.2、sk_buff数据区 sk_buff结构体中的都是sk_buff的控制信息,是网络数据包的一些配置,真正储存数据的是sk_buff结构体中几个指针指向的数据区中, ...