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