[英]does signal handler code block the main process?
I am registering an alarm signal handler as follows and an alarm signal is set every second. 我正在按以下方式注册警报信号处理程序,并且每秒设置一个警报信号。
sigact.sa_handler = time_handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
if (sigaction(SIGALRM, &sigact, NULL) < 0)
panic("sigaction SIGALRM: %s\n", strerror(errno));
/* Set alarm signal every second */
alarm(1);
My question is does the function time_handler
follow a separate execution path like a thread or does it block the main process. 我的问题是函数
time_handler
遵循单独的执行路径(如线程)还是阻塞了主进程。
您可以通过在回调中添加sleep()来查看是否正在使用GNU C,然后查看之后的代码是否延迟。
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