linux下定时器的使用--timer_create等系列
2019-07-13 03:00发布
生成海报
转自:
http://blog.csdn.net/leo9150285/article/details/8271910
直接上程序
程序1:采用新线程派驻的通知方式
[cpp]
view plaincopyprint?
- #include
- #include
- #include
- #include
- #include
- #include
-
- #define CLOCKID CLOCK_REALTIME
-
- void timer_thread(union sigval v)
- {
- printf("timer_thread function! %d
", v.sival_int);
- }
-
- int main()
- {
-
-
-
-
- timer_t timerid;
- struct sigevent evp;
- memset(&evp, 0, sizeof(struct sigevent));
-
- evp.sigev_value.sival_int = 111;
- evp.sigev_notify = SIGEV_THREAD;
- evp.sigev_notify_function = timer_thread;
-
- if (timer_create(CLOCKID, &evp, &timerid) == -1)
- {
- perror("fail to timer_create");
- exit(-1);
- }
-
-
-
-
-
-
-
-
- struct itimerspec it;
- it.it_interval.tv_sec = 1;
- it.it_interval.tv_nsec = 0;
- it.it_value.tv_sec = 1;
- it.it_value.tv_nsec = 0;
-
- if (timer_settime(timerid, 0, &it, NULL) == -1)
- {
- perror("fail to timer_settime");
- exit(-1);
- }
-
- pause();
-
- return 0;
- }
-
-
-
-
-
#include
#include
#include
#include
#include
#include
#define CLOCKID CLOCK_REALTIME
void timer_thread(union sigval v)
{
printf("timer_thread function! %d
", v.sival_int);
}
int main()
{
// XXX int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid);
// clockid--值:CLOCK_REALTIME,CLOCK_MONOTONIC,CLOCK_PROCESS_CPUTIME_ID,CLOCK_THREAD_CPUTIME_ID
// evp--存放环境值的地址,结构成员说明了定时器到期的通知方式和处理方式等
// timerid--定时器标识符
timer_t timerid;
struct sigevent evp;
memset(&evp, 0, sizeof(struct sigevent)); //清零初始化
evp.sigev_value.sival_int = 111; //也是标识定时器的,这和timerid有什么区别?回调函数可以获得
evp.sigev_notify = SIGEV_THREAD; //线程通知的方式,派驻新线程
evp.sigev_notify_function = timer_thread; //线程函数地址
if (timer_create(CLOCKID, &evp, &timerid) == -1)
{
perror("fail to timer_create");
exit(-1);
}
// XXX int timer_settime(timer_t timerid, int flags, const struct itimerspec *new_value,struct itimerspec *old_value);
// timerid--定时器标识
// flags--0表示相对时间,1表示绝对时间
// new_value--定时器的新初始值和间隔,如下面的it
// old_value--取值通常为0,即第四个参数常为NULL,若不为NULL,则返回定时器的前一个值
//第一次间隔it.it_value这么长,以后每次都是it.it_interval这么长,就是说it.it_value变0的时候会装载it.it_interval的值
struct itimerspec it;
it.it_interval.tv_sec = 1;
it.it_interval.tv_nsec = 0;
it.it_value.tv_sec = 1;
it.it_value.tv_nsec = 0;
if (timer_settime(timerid, 0, &it, NULL) == -1)
{
perror("fail to timer_settime");
exit(-1);
}
pause();
return 0;
}
/*
* int timer_gettime(timer_t timerid, struct itimerspec *curr_value);
* 获取timerid指定的定时器的值,填入curr_value
*
*/
程序2:通知方式为信号的处理方式
[cpp]
view plaincopyprint?
- #include
- #include
- #include
- #include
- #include
- #include
-
- #define CLOCKID CLOCK_REALTIME
-
- void sig_handler(int signo)
- {
- printf("timer_signal function! %d
", signo);
- }
-
- int main()
- {
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- timer_t timerid;
- struct sigevent evp;
-
- struct sigaction act;
- memset(&act, 0, sizeof(act));
- act.sa_handler = sig_handler;
- act.sa_flags = 0;
-
-
-
-
- sigemptyset(&act.sa_mask);
-
- if (sigaction(SIGUSR1, &act, NULL) == -1)
- {
- perror("fail to sigaction");
- exit(-1);
- }
-
- memset(&evp, 0, sizeof(struct sigevent));
- evp.sigev_signo = SIGUSR1;
- evp.sigev_notify = SIGEV_SIGNAL;
- if (timer_create(CLOCK_REALTIME, &evp, &timerid) == -1)
- {
- perror("fail to timer_create");
- exit(-1);
- }
-
- struct itimerspec it;
- it.it_interval.tv_sec = 2;
- it.it_interval.tv_nsec = 0;
- it.it_value.tv_sec = 1;
- it.it_value.tv_nsec = 0;
- if (timer_settime(timerid, 0, &it, 0) == -1)
- {
- perror("fail to timer_settime");
- exit(-1);
- }
-
- pause();
-
- return 0;
- }
#include
#include
#include
#include
#include
#include
#define CLOCKID CLOCK_REALTIME
void sig_handler(int signo)
{
printf("timer_signal function! %d
", signo);
}
int main()
{
// XXX int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
// signum--指定的信号编号,可以指定SIGKILL和SIGSTOP以外的所有信号编号
// act结构体--设置信号编号为signum的处理方式
// oldact结构体--保存上次的处理方式
//
// struct sigaction
// {
// void (*sa_handler)(int); //信号响应函数地址
// void (*sa_sigaction)(int, siginfo_t *, void *); //但sa_flags为SA——SIGINFO时才使用
// sigset_t sa_mask; //说明一个信号集在调用捕捉函数之前,会加入进程的屏蔽中,当捕捉函数返回时,还原
// int sa_flags;
// void (*sa_restorer)(void); //未用
// };
//
timer_t timerid;
struct sigevent evp;
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sig_handler;
act.sa_flags = 0;
// XXX int sigaddset(sigset_t *set, int signum); //将signum指定的信号加入set信号集
// XXX int sigemptyset(sigset_t *set); //初始化信号集
sigemptyset(&act.sa_mask);
if (sigaction(SIGUSR1, &act, NULL) == -1)
{
perror("fail to sigaction");
exit(-1);
}
memset(&evp, 0, sizeof(struct sigevent));
evp.sigev_signo = SIGUSR1;
evp.sigev_notify = SIGEV_SIGNAL;
if (timer_create(CLOCK_REALTIME, &evp, &timerid) == -1)
{
perror("fail to timer_create");
exit(-1);
}
struct itimerspec it;
it.it_interval.tv_sec = 2;
it.it_interval.tv_nsec = 0;
it.it_value.tv_sec = 1;
it.it_value.tv_nsec = 0;
if (timer_settime(timerid, 0, &it, 0) == -1)
{
perror("fail to timer_settime");
exit(-1);
}
pause();
return 0;
}
注意,编译的时候 gcc -lrt
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