1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 // UNSUPPORTED: darwin
3 // Fails episodically on powerpc bots:
4 // https://lab.llvm.org/buildbot/#/builders/121/builds/13391
5 // UNSUPPORTED: target=powerpc64{{.*}}
6 #include "test.h"
7 #include <errno.h>
8 #include <signal.h>
9 #include <sys/time.h>
10 #include <sys/types.h>
11
12 // Test synchronization in signal handled within IgnoreSync region.
13
14 const int kSignalCount = 500;
15
16 __thread int process_signals;
17 int signals_handled;
18 int done;
19 int ready[kSignalCount];
20 long long data[kSignalCount];
21
handler(int sig)22 static void handler(int sig) {
23 if (!__atomic_load_n(&process_signals, __ATOMIC_RELAXED))
24 return;
25 int pos = signals_handled++;
26 if (pos >= kSignalCount)
27 return;
28 data[pos] = pos;
29 __atomic_store_n(&ready[pos], 1, __ATOMIC_RELEASE);
30 }
31
thr(void * p)32 static void* thr(void *p) {
33 AnnotateIgnoreSyncBegin(__FILE__, __LINE__);
34 __atomic_store_n(&process_signals, 1, __ATOMIC_RELAXED);
35 while (!__atomic_load_n(&done, __ATOMIC_RELAXED)) {
36 }
37 AnnotateIgnoreSyncEnd(__FILE__, __LINE__);
38 return 0;
39 }
40
main()41 int main() {
42 struct sigaction act = {};
43 act.sa_handler = handler;
44 if (sigaction(SIGPROF, &act, 0)) {
45 perror("sigaction");
46 exit(1);
47 }
48 itimerval t;
49 t.it_value.tv_sec = 0;
50 t.it_value.tv_usec = 10;
51 t.it_interval = t.it_value;
52 if (setitimer(ITIMER_PROF, &t, 0)) {
53 perror("setitimer");
54 exit(1);
55 }
56
57 pthread_t th;
58 pthread_create(&th, 0, thr, 0);
59 for (int pos = 0; pos < kSignalCount; pos++) {
60 while (__atomic_load_n(&ready[pos], __ATOMIC_ACQUIRE) == 0) {
61 }
62 if (data[pos] != pos) {
63 printf("at pos %d, expect %d, got %lld\n", pos, pos, data[pos]);
64 exit(1);
65 }
66 }
67 __atomic_store_n(&done, 1, __ATOMIC_RELAXED);
68 pthread_join(th, 0);
69 fprintf(stderr, "DONE\n");
70 return 0;
71 }
72
73 // CHECK-NOT: WARNING: ThreadSanitizer:
74 // CHECK: DONE
75