linux centos timer_create接口

参考: https://www.cnblogs.com/muyi23333/articles/13523251.html
     https://blog.51cto.com/u_15352922/3745226
     https://blog.csdn.net/weixin_34145418/article/details/116968058

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4 #include <unistd.h>
  5 #include <pthread.h>
  6 #include <signal.h>
  7 #include <time.h>
  8 #include <sys/timeb.h>
  9 #include <sys/times.h>
 10 
 11 
 12 
 13 #define xxxx_print_ln(log_level, fmt, ...) do { printf("(%s|%d)" fmt "\r\n", __func__, __LINE__, ##__VA_ARGS__); fflush(stdout);} while(0)
 14 
 15 typedef void (*F_TIMER_CB)(void *);
 16 
 17 
 18 void xxxx_timer_delete(void *timerid);
 19 
 20 typedef struct _T_TIMER_ARG
 21 {
 22     F_TIMER_CB timer_cb;
 23     void *arg;
 24     void *timerid;
 25     int is_onlyOnce;
 26 }T_TIMER_ARG;
 27 
 28 
 29 /*****************************************************************
 30 
 31     定时器接口(第0套): 启动定时器
 32 
 33     参数 : timerid, 定时器句柄
 34            deleay_ms, 触发时间(ms)
 35            interval_ms, 周期触发间隔(ms)
 36 
 37      return : 非NULL, 成功, 返回定时器句柄
 38                 NULL, 失败
 39 
 40 *****************************************************************/
 41 static int xxxx_timer_start(void *timerid, size_t deleay_ms, size_t interval_ms)
 42 {
 43     struct itimerspec it;
 44 
 45     it.it_value.tv_sec = deleay_ms / 1000;
 46     it.it_value.tv_nsec = (deleay_ms % 1000) * 1000 * 1000;
 47 
 48     it.it_interval.tv_sec = interval_ms / 1000;
 49     it.it_interval.tv_nsec = (interval_ms % 1000) * 1000 * 1000;
 50 
 51     if (0 != timer_settime((timer_t)timerid, 0, &it, NULL)) {
 52         return -1;
 53     }
 54 
 55     return 0;
 56 }
 57 
 58 static void xxxx_timer_thread(union sigval sig_v)
 59 {
 60     T_TIMER_ARG *timer_arg = NULL;
 61 
 62     timer_arg = (T_TIMER_ARG *)sig_v.sival_ptr;
 63 
 64     if (NULL == timer_arg) {
 65         xxxx_print_ln(xxxx_ERROR, "timer_arg is no-valid");
 66         return ;
 67     }
 68 
 69     if (NULL != timer_arg->timer_cb) {
 70         timer_arg->timer_cb(timer_arg->arg);
 71     }
 72 
 73     if (timer_arg->is_onlyOnce) {
 74         xxxx_timer_delete(timer_arg->timerid);
 75         timer_arg->timerid = 0;
 76     }
 77 }
 78 
 79 /*****************************************************************
 80 
 81     定时器接口(第0套): 创建定时器
 82 
 83     参数 :
 84            is_onlyOnce, 1仅一次(结束后句柄自动被删除), 0周期性定时器
 85            timer_cb, 回调函数
 86            arg, 回调函数的参数
 87 
 88      return : 非NULL, 成功, 返回定时器句柄
 89                 NULL, 失败
 90 
 91 *****************************************************************/
 92 static void *xxxx_timer_create(int is_onlyOnce, F_TIMER_CB timer_cb, void *arg)
 93 {
 94     timer_t timerid;
 95     struct sigevent evp;
 96     T_TIMER_ARG *timer_arg = NULL;
 97 
 98     /*
 99         参考: https://www.cnblogs.com/muyi23333/articles/13523251.html
100               https://blog.51cto.com/u_15352922/3745226
101               https://blog.csdn.net/weixin_34145418/article/details/116968058
102     */
103 
104     timer_arg = (T_TIMER_ARG *)calloc(1, sizeof(T_TIMER_ARG));
105     if (NULL == timer_arg) {
106         xxxx_print_ln(xxxx_ERROR, "malloc failed(size=%u)", sizeof(T_TIMER_ARG));
107         return NULL;
108     }
109 
110     timer_arg->arg = arg;
111     timer_arg->timer_cb = timer_cb;
112     timer_arg->is_onlyOnce = (is_onlyOnce) ? 1 : 0;
113 
114     memset(&evp, 0, sizeof(struct sigevent));
115 
116     evp.sigev_value.sival_ptr = (void *)timer_arg;
117     evp.sigev_notify = SIGEV_THREAD; // 线程通知的方式，派驻新线程
118     evp.sigev_notify_function = xxxx_timer_thread;
119 
120     if (0 != timer_create(CLOCK_REALTIME, &evp, &timerid)) {
121         return NULL;
122     }
123     timer_arg->timerid = (void *)timerid;
124 
125     return (void *)timerid;
126 }
127 
128 /*****************************************************************
129 
130     定时器接口(第0套): 删除定时器
131 
132     参数 : timerid, 定时器句柄
133            deleay_ms, 触发时间(ms)
134            interval_ms, 周期触发间隔(ms)
135 
136      return : 非NULL, 成功, 返回定时器句柄
137                 NULL, 失败
138 
139 *****************************************************************/
140 void xxxx_timer_delete(void *timerid)
141 {
142     if (NULL == timerid) {
143         return;
144     }
145 
146     // 同一个timerid, 多次重复删除, 不会引起崩溃
147     timer_delete((timer_t)timerid);
148 
149     xxxx_print_ln(xxxx_INFO, "timer deleted (timerid=%x)", timerid);
150 
151     return ;
152 }
153 
154 /*****************************************************************
155 
156     定时器接口(第一套): 创建一次性定时器
157 
158     参数 :
159            deleay_ms, 触发时间(ms)
160            timer_cb, 回调函数
161            arg, 回调函数的参数
162 
163      return : 非NULL, 成功, 返回定时器句柄
164                 NULL, 失败
165 
166 *****************************************************************/
167 void *xxxx_timer_once(size_t deleay_ms, F_TIMER_CB timer_cb, void *arg)
168 {
169     void *timerid = NULL;
170     int ret = 0;
171 
172     timerid = xxxx_timer_create(1, timer_cb, arg);
173     if (NULL == timerid) {
174         return NULL;
175     }
176 
177     ret = xxxx_timer_start(timerid, deleay_ms, 0);
178 
179     return (0 == ret )? timerid : NULL;
180 }
181 
182 /*****************************************************************
183 
184     定时器接口(第二套): 创建重复性定时器
185 
186     参数 :
187            deleay_ms, 触发时间(ms)
188            interval_ms, 周期触发间隔(ms)
189            timer_cb, 回调函数
190            arg, 回调函数的参数
191 
192      return : 非NULL, 成功, 返回定时器句柄
193                 NULL, 失败
194 
195 *****************************************************************/
196 void *xxxx_timer_interval(size_t deleay_ms, size_t interval_ms, F_TIMER_CB timer_cb, void *arg)
197 {
198     void *timerid = NULL;
199     int ret = 0;
200 
201     timerid = xxxx_timer_create(0, timer_cb, arg);
202     if (NULL == timerid) {
203         return NULL;
204     }
205 
206     ret = xxxx_timer_start(timerid, deleay_ms, interval_ms);
207 
208     return (0 == ret ) ? timerid : NULL;
209 }

/****************************************
  返回当前时间字符串

  格式为20211223_160548_054

  参数 : 无

  return :  非NULL, 当前时间字符串, 需要释放
****************************************/
char *xxxx_get_time_stamp(void)
{
    char *time_stamp_out = NULL;
    time_t ltime;
    struct tm *today;
    struct timeb timebuffer;

    time( &ltime );
    today = localtime( &ltime );
    ftime( &timebuffer);

    asprintf(&time_stamp_out, "%04d%02d%02d_%02d%02d%02d_%03d", 1900 + today->tm_year,
                                                                  today->tm_mon + 1,
                                                                  today->tm_mday,
                                                                  today->tm_hour,
                                                                  today->tm_min,
                                                                  today->tm_sec,
                                                                  timebuffer.millitm);

    return time_stamp_out;
}


void t_cb(void *arg)
{
    printf("%s\r\n", arg);
    printf("%s\r\n", xxxx_get_time_stamp());
}

int main(int argc, char *argv)
{

    void *h = NULL;
printf("%s\r\n", xxxx_get_time_stamp());
#if 0
    h = xxxx_timer_once(2600, t_cb, "thanks!!!");

    sleep(5);
    
    xxxx_timer_delete(h);

    sleep(5);
#else
    h = xxxx_timer_interval(2897, 5897, t_cb, "thanks!!!");
    sleep(30);
    
    xxxx_timer_delete(h);

    sleep(30);
#endif


    return 0;
}

gcc my_timer.c my_timer_test.c  -lrt  -o  a.out ; ./a.out

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原文地址：https://www.cnblogs.com/LiuYanYGZ/p/16602898.html