NSEC_PER_SEC; } #给timespec64结构体的纳秒赋值 ts.tv_nsec = rem; #返回timespec64 结构体给用户使用 return ts; } struct timeval...ns_to_timeval(const s64 nsec)用于将纳秒转成timeval格式返回给用户 其源码分析如下: struct timeval ns_to_timeval(const s64 nsec...) { #首先将形参的纳秒转成timespec struct timespec ts = ns_to_timespec(nsec); struct timeval tv; #然后通过timespec...的结构体成员变量赋值给timeval成员变量....tv.tv_sec = ts.tv_sec; tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000; #返回timeval 给用户使用 return tv; }
time (&timep); printf(“%s”,ctime(&timep)); return 0; } gettimeofday调用 通过gettimeofday调用返回来的是一个timeval...的结构体,其中tv_sec是秒数,tv_usec是微秒数,通过这两个数共同标志当前时间 #ifndef _STRUCT_TIMEVAL #define _STRUCT_TIMEVAL struct...timeval _STRUCT_TIMEVAL { __darwin_time_t tv_sec; /* seconds */ __darwin_suseconds_t...tv_usec; /* and microseconds */ }; #endif /* _STRUCT_TIMEVAL */ 该函数的使用如下 #include int main(void) { struct timeval time; gettimeofday(&time, NULL); printf("Current Time Seconds
*tv, struct timezone *tz); gettimeofday 函数获取当前时间,并将其存储在 struct timeval 结构体中。...tv 参数是一个指向 struct timeval 结构体的指针,用于存储获取的时间信息。 tz 参数是一个指向 struct timezone 结构体的指针,用于存储时区信息。...struct timeval 结构体的定义如下: struct timeval { time_t tv_sec; // 秒数 suseconds_t tv_usec;...在 C 语言中,需要包含 头文件,并且需要额外定义 struct timeval 结构体。...在 C++ 语言中,同样需要包含 头文件,并且使用 struct timeval 结构体来存储时间信息。
比如系统调用gettimeofday/settiemofday int gettimeofday(struct timeval *tv, struct timezone *tz); int settimeofday...(const struct timeval *tv, const struct timezone *tz) 其实就用到了struct timeval结构体 struct timeval { __kernel_time_t...tv_sec; /* seconds */ __kernel_suseconds_t tv_usec; /* microseconds */ }; timeval是由秒和微秒组成,__kernel_time_t...value); void jiffies_to_timespec(const unsigned long jiffies,struct timespec *value); unsigned long timeval_to_jiffies...(const struct timeval *value); void jiffies_to_timeval(const unsigned long jiffies,
= true) { mPendingEvent.timestamp = timevalToNano(event->time); } event->time代表了按键时间;可以用struct timeval...其中input_event和timeval结构体如下: struct input_event { struct timeval time; //按键时间 __u16 type; //类型,在下面有定义...__u16 code; //要模拟成什么按键 __s32 value;//是按下还是释放 }; struct timeval { __kernel_time_t tv_sec...__kernel_suseconds_t tv_usec; /* microseconds */ }; //将时间转换为ns static int64_t timevalToNano(timeval
){0, 0};}char TimerIsExpired(Timer* timer){struct timeval now, res;gettimeofday(&now, NULL);timersub(...now;gettimeofday(&now, NULL);struct timeval interval = {timeout / 1000, (timeout % 1000) * 1000};timeradd...(&now, &interval, &timer->end_time);}void TimerCountdown(Timer* timer, unsigned int timeout){struct timeval...now;gettimeofday(&now, NULL);struct timeval interval = {timeout, 0};timeradd(&now, &interval, &timer...->end_time);}int TimerLeftMS(Timer* timer){struct timeval now, res;gettimeofday(&now, NULL);timersub(
Linux下常用的时间类型有4个:time_t,struct timeb, struct timeval,struct timespec,clock_t, struct tm. (1) time_t是一个长整型...(3) struct timeval有两个成员,一个是秒,一个是微妙. 1 struct timeval 2 { 3 long tv_sec; /* seconds */ 4 long...tv_usec; /* microseconds */ 5 }; 由int gettimeofday(struct timeval *tv, struct timezone *tz);获取. struct...struct timespec *rem); 4 int select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,struct timeval
time.h> int select(int maxfd, fd_set * readset, fd_set * writeset, fd_set * exceptset, const struct timeval...fdset 指向的变量中清除文件描述符 fd 的信息 FD_ISSET(int fd, fd_set * fdset) 若参数 fdset 指向的变量中包含文件描述符 fd 的信息,则返回真 timeval...超时设置结构体 struct timeval { long tv_sec; //seconds long tv_usec; //microseconds } select函数执行前后示例图...BUF_SIZE 1024 int main(int argc, char *argv[]) { //监视的文件描述符 fd_set reads, temps; struct timeval
&log_main; vlib_log_class_registration_t *r = lm->registrations; gettimeofday (&lm->time_zero_timeval...时间相关 struct timeval time_zero_timeval; 记录了“时间零点”的timeval结构体,用于时间戳的计算。...2、时间戳操作 gettimeofday (&lm->time_zero_timeval, 0); lm->time_zero = vlib_time_now (vm); gettimeofday...是linux系统函数,它的目的是获取当前时间戳,并将其存储在lm->time_zero_timeval中。...+ (((f64) lm->time_zero_timeval.tv_usec) * 1e-6) - lm->time_zero; while (count--) {
time(unsigned int *); typedef unsigned int time_t; typedef unsigned int suseconds_t; struct timeval...struct timezone { int tz_minuteswest; int tz_dsttime; }; int gettimeofday(struct timeval...\n", "PHP");var_dump($libc->getenv("PATH"));var_dump($libc->time(null));$tv = $libc->new("struct timeval
设置一个10亿的执行次数 #define MAX_NUM 1000000000 struct TestLine { int x; int y; }; int GetTimeCost(const timeval...&beg,const timeval &end) { return (end.tv_sec-beg.tv_sec) * 1000 + (end.tv_usec-beg.tv_usec)/1000;...TestLine *tl) { for ( int it = 0;it < MAX_NUM ; ++it) { tl->y +=1; } return ; } int main(){ timeval...TestLine { int x; long long buf[8]; // 新增一个8个long long 类型的数组 int y; }; int GetTimeCost(const timeval...&beg,const timeval &end) { return (end.tv_sec-beg.tv_sec) * 1000 + (end.tv_usec-beg.tv_usec)/1000;
errno.h> #include #include #include struct timeval...event_is_persistent; static void timeout_cb(evutil_socket_t fd, short event, void *arg) { struct timeval...event_is_persistent) { struct timeval tv; evutil_timerclear(&tv); tv.tv_sec =...event_add(timeout, &tv); } } int main(int argc, char **argv) { struct event timeout; struct timeval
0) { puts("Send failed"); return 1; } puts("Data Send\n"); struct timeval...timeout = {3, 0}; setsockopt(socket_desc, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(struct timeval...程序中 struct timeval timeout = {3,0}; setsockopt(socket_desc, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout..., sizeof(struct timeval)); 设置超时时间为3s,现在recv 为阻塞接收,如果超时时间内接收缓冲区没有一点数据,则返回-1 且errno = EWOULDBLOCK 。
1.1 select函数原型 int select(int maxfdp, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval...set); //将fd从set中清除 FD_ISSET(fd, &set); //如果fd在set中则为真,通常用来检查某个文件描述符是否在描述符集合中,然后去读、写、接收连接 struct timeval...()/select()/send()/recv()/close() 1.3 select使用 使用select也需先将socket设置为非阻塞的 下面演示如何使用select函数: struct timeval...伪代码如下: fd_set read_set; struct timeval t_o; FD_ZERO(&read_set); FD_SET(lSockFd,&read_set); t_o.tv_sec
结构体为: struct timeval{ long tv_sec; /*秒*/ long tv_usec; /*微秒*/ }; 来看下使用的小栗子: struct timeval...for (int i = 0; i < width * height; i++){ m[i] = 1.0; n[i] = 2.0; } struct timeval...width + blockSize.x - 1) / blockSize.x, (height + blockSize.y - 1) / blockSize.y); struct timeval
Ui { class Monitor64x32; } class Monitor64x32 : public QMainWindow { Q_OBJECT public: struct timeval...int keymap(unsigned char k); void keyPressEvent(QKeyEvent *event); int timediff_ms(struct timeval...*end, struct timeval *start); void keyReleaseEvent(QKeyEvent *event); ~Monitor64x32();...cpu.tick(); clock_prev = clock_now; } }; //分频器 int Monitor64x32::timediff_ms(struct timeval...*end, struct timeval *start) { int diff = (end->tv_sec - start->tv_sec) * 1000 +
eventLoop, int fd, int mask) /* * 获取可执行事件 */ static int aeApiPoll(aeEventLoop *eventLoop, struct timeval...获取间隔时间 timeval = shortest - nowTime; // 如果timeval 小于 0,说明已经有需要执行的时间事件了。...if(timeval < 0){ timeval = 0 } // 3. 在 timeval 时间内,取出文件事件。...numevents = aeApiPoll(eventLoop, timeval); // 4.根据文件事件的类型指定不同的文件处理器 if (AE_READABLE) { // 读事件
argc, const char *argv[]) { pthread_t id[N]; int process[N]; int i = 0; uint64_t usetime; struct timeval...start; struct timeval end; gettimeofday(&start,NULL); for(i=0;i<N;++i) { process[i] = i; }...int main(int argc, const char *argv[]) { pthread_t id[20]; int i = 0; uint64_t usetime; struct timeval...start; struct timeval end; gettimeofday(&start,NULL); for(i=0;i<N;++i) { pthread_create(&id
fd_set*readset,fd_set*writeset,fd_set*exceptset,structtimeval*timeout); 原理 利用select的timeout参数实现定时器; 设置timeval...示例 void usleep(unsigned long usec) { struct timeval tv; tv.tv_sec = usec / 1000000; tv.tv_usec
Linux上最常见的时间存储方案有四种:time_t,struct tm,struct timeval和struct timespec。我们分别介绍它们。...过时的timeval timeval的声明如下: #include struct timeval www.jintianxuesha.com{ time_t...tv_sec; // 秒 suseconds_t tv_usec; // us 微秒 }; 前面两种方案精度只能到秒,而struct timeval可以存储到微秒。...// 使用timeval作为时间长度 struct timeval wait_time = {1, 500000}; // 1.5秒 select(NFDS, read_fds, write_fds,...使用timeval结构的函数也少的可怜,只有select和pselect。
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