+
+/*---------- printing rate limit ----------*/
+
+static volatile unsigned print_todo;
+static sigset_t print_alarmset;
+
+static int printing_check(enum printing_instance which) {
+ static int skipped[pr__max];
+
+ unsigned bits= 1u << which;
+ int sk;
+
+ if (!(print_todo & bits)) {
+ skipped[which]++;
+ return 0;;
+ }
+
+ sigprocmask(SIG_BLOCK,&print_alarmset,0);
+ print_todo &= ~bits;
+ sigprocmask(SIG_UNBLOCK,&print_alarmset,0);
+
+ sk= skipped[which];
+ if (sk) printf("[%4d] ",sk);
+ else printf(" ");
+ skipped[which]= 0;
+
+ return 1;
+}
+
+static void alarmhandler(int ignored) {
+ print_todo= ~0u;
+}
+
+static void printing_init(void) {
+ struct sigaction sa;
+ struct itimerval itv;
+
+ sigemptyset(&print_alarmset);
+ sigaddset(&print_alarmset,SIGALRM);
+
+ sa.sa_handler= alarmhandler;
+ sa.sa_mask= print_alarmset;
+ sa.sa_flags= SA_RESTART;
+ if (sigaction(SIGALRM,&sa,0)) diee("sigaction ALRM");
+
+ itv.it_interval.tv_sec= 0;
+ itv.it_interval.tv_usec= 200000;
+ itv.it_value= itv.it_interval;
+
+ if (setitimer(ITIMER_REAL,&itv,0)) diee("setitimer REAL");
+
+ raise(SIGALRM);
+}