1 // RUN: %clangxx_tsan %s -o %t && %run %t 2>&1 | FileCheck %s
2
3 #include <pthread.h>
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <signal.h>
7 #include <sys/types.h>
8 #include <sys/time.h>
9 #include <unistd.h>
10 #include <errno.h>
11
12 volatile bool signal_delivered;
13
handler(int sig)14 static void handler(int sig) {
15 if (sig == SIGALRM)
16 signal_delivered = true;
17 }
18
thr(void * p)19 static void* thr(void *p) {
20 sigset_t sigset;
21 sigemptyset(&sigset);
22 sigaddset(&sigset, SIGALRM);
23 int ret = pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
24 if (ret) abort();
25
26 struct sigaction act = {};
27 act.sa_handler = &handler;
28 if (sigaction(SIGALRM, &act, 0)) {
29 perror("sigaction");
30 exit(1);
31 }
32
33 itimerval t;
34 t.it_value.tv_sec = 0;
35 t.it_value.tv_usec = 10000;
36 t.it_interval = t.it_value;
37 if (setitimer(ITIMER_REAL, &t, 0)) {
38 perror("setitimer");
39 exit(1);
40 }
41
42 while (!signal_delivered) {
43 usleep(1000);
44 }
45
46 t.it_value.tv_usec = 0;
47 if (setitimer(ITIMER_REAL, &t, 0)) {
48 perror("setitimer");
49 exit(1);
50 }
51
52 fprintf(stderr, "SIGNAL DELIVERED\n");
53
54 return 0;
55 }
56
main()57 int main() {
58 sigset_t sigset;
59 sigemptyset(&sigset);
60 sigaddset(&sigset, SIGALRM);
61 int ret = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
62 if (ret) abort();
63
64 pthread_t th;
65 pthread_create(&th, 0, thr, 0);
66 pthread_join(th, 0);
67
68 fprintf(stderr, "DONE\n");
69 return 0;
70 }
71
72 // CHECK-NOT: WARNING: ThreadSanitizer:
73 // CHECK: SIGNAL DELIVERED
74 // CHECK: DONE
75 // CHECK-NOT: WARNING: ThreadSanitizer:
76