1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2// UNSUPPORTED: darwin
3
4// FIXME: Very flaky on PPC with COMPILER_RT_DEBUG.
5// https://github.com/google/sanitizers/issues/1792
6// UNSUPPORTED: !compiler-rt-optimized && ppc
7
8#include <pthread.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <signal.h>
12#include <sys/types.h>
13#include <sys/time.h>
14#include <unistd.h>
15#include <errno.h>
16
17volatile int X;
18int stop;
19
20static void handler(int sig) {
21 (void)sig;
22 if (X != 0)
23 printf(format: "bad");
24}
25
26static void* busy(void *p) {
27 while (__atomic_load_n(&stop, __ATOMIC_RELAXED) == 0) {
28 }
29 return 0;
30}
31
32static void* reset(void *p) {
33 struct sigaction act = {};
34 for (int i = 0; i < 1000000; i++) {
35 act.sa_handler = &handler;
36 if (sigaction(SIGPROF, act: &act, oact: 0)) {
37 perror(s: "sigaction");
38 exit(status: 1);
39 }
40 act.sa_handler = SIG_IGN;
41 if (sigaction(SIGPROF, act: &act, oact: 0)) {
42 perror(s: "sigaction");
43 exit(status: 1);
44 }
45 }
46 return 0;
47}
48
49int main() {
50 struct sigaction act = {};
51 act.sa_handler = SIG_IGN;
52 if (sigaction(SIGPROF, act: &act, oact: 0)) {
53 perror(s: "sigaction");
54 exit(status: 1);
55 }
56
57 itimerval t;
58 t.it_value.tv_sec = 0;
59 t.it_value.tv_usec = 10;
60 t.it_interval = t.it_value;
61 if (setitimer(ITIMER_PROF, new: &t, old: 0)) {
62 perror(s: "setitimer");
63 exit(status: 1);
64 }
65
66 pthread_t th[2];
67 pthread_create(newthread: &th[0], attr: 0, start_routine: busy, arg: 0);
68 pthread_create(newthread: &th[1], attr: 0, start_routine: reset, arg: 0);
69
70 pthread_join(th: th[1], thread_return: 0);
71 __atomic_store_n(&stop, 1, __ATOMIC_RELAXED);
72 pthread_join(th: th[0], thread_return: 0);
73
74 fprintf(stderr, format: "DONE\n");
75 return 0;
76}
77
78// CHECK-NOT: WARNING: ThreadSanitizer:
79// CHECK: DONE
80// CHECK-NOT: WARNING: ThreadSanitizer:
81

source code of compiler-rt/test/tsan/signal_reset.cpp