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