被SIGALRM中断
时间：2006-07-03 来源：nantianyan
sleep()函数会被SIGALRM中断。
如下屏蔽后就好了
// block SIGALRM temporarily
sigemptyset (&sa_mask);
sigaddset (&sa_mask, SIGALRM);
pthread_sigmask (SIG_BLOCK, &sa_mask, NULL);
printf("before sleep\n");
sleep(20);
printf("after sleep\n"); // unblock SIGALRM
pthread_sigmask (SIG_UNBLOCK, &sa_mask, NULL);
sigemptyset (&sa_mask);
sigaddset (&sa_mask, SIGALRM);
pthread_sigmask (SIG_BLOCK, &sa_mask, NULL);
printf("before sleep\n");
sleep(20);
printf("after sleep\n"); // unblock SIGALRM
pthread_sigmask (SIG_UNBLOCK, &sa_mask, NULL);
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