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alert可以同linux平台下的signal。
alert的初始化：
方法1：
extern int my_alert_handler(struct k_alert *alert);struct k_alert my_alert;k_alert_init(&my_alert, my_alert_handler, 10);
方法2：
extern int my_alert_handler(struct k_alert *alert);K_ALERT_DEFINE(my_alert, my_alert_handler, 10);
发出一个alert：
extern int my_alert_handler(struct k_alert *alert);K_ALERT_DEFINE(my_alert, my_alert_handler, 10);void keypress_interrupt_handler(void *arg)
{...k_alert_send(&my_alert);...
}
处理一个alert：
int <function_name>(struct k_alert *alert)
{/* catch the alert signal; return zero if the signal is consumed, *//* or non-zero to let the alert pend */...
}
int my_alert_handler(struct k_alert *alert_id_is_unused)
{/* determine what key was pressed */char c = get_keypress();/* do complex processing of the keystroke */.../* signaled alert has been consumed */return 0;
}
接收一个alert：
int my_alert_handler(struct k_alert *alert_id_is_unused)
{/* determine what key was pressed */char c = get_keypress();/* signal thread only if key pressed was a digit */if ((c >= '0') && (c <= '9')) {/* save key press information */.../* signaled alert should be pended */return 1;} else {/* signaled alert has been consumed */return 0;}
}void keypress_thread(void *unused1, void *unused2, void *unused3)
{/* consume numeric key presses */while (1) {/* wait for a key press alert to pend */k_alert_recv(&my_alert, K_FOREVER);/* process saved key press, which must be a digit */...}
}
一个挂起的的alter可以通过另一个线程调用k_alert_recv()接口接收这个alter。
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