1// RUN: %clangxx_tsan -O1 %s -DBUILD_SO -fPIC -shared -o %t-so.so
2// RUN: %clangxx_tsan -O1 %s %link_libcxx_tsan -o %t && %run %t 2>&1 | FileCheck %s
3
4// dl_iterate_phdr doesn't exist on OS X.
5// UNSUPPORTED: darwin
6
7#ifdef BUILD_SO
8
9#include "test.h"
10
11int exported_var = 0;
12
13#else // BUILD_SO
14
15#include "test.h"
16#include <dlfcn.h>
17#include <link.h>
18#include <string.h>
19#include <string>
20
21static int callback(struct dl_phdr_info *info, size_t size, void *data) {
22 if (info->dlpi_name[0] == '\0')
23 info->dlpi_name = "/proc/self/exe";
24 return !strcmp(info->dlpi_name, "non existent module");
25}
26
27void *thread(void *unused) {
28 for (int i = 0; i < 1000; i++) {
29 barrier_wait(&barrier);
30 dl_iterate_phdr(callback, 0);
31 }
32 return 0;
33}
34
35int main(int argc, char *argv[]) {
36 barrier_init(&barrier, 2);
37 std::string path = std::string(argv[0]) + std::string("-so.so");
38 pthread_t th;
39 pthread_create(&th, 0, thread, 0);
40 for (int i = 0; i < 1000; i++) {
41 barrier_wait(&barrier);
42 void *lib = dlopen(path.c_str(), RTLD_NOW);
43 if (!lib) {
44 printf("error in dlopen: %s\n", dlerror());
45 return 1;
46 }
47 dlclose(lib);
48 }
49 pthread_join(th, 0);
50 fprintf(stderr, "DONE\n");
51 return 0;
52}
53
54#endif // BUILD_SO
55
56// CHECK-NOT: WARNING: ThreadSanitizer: data race
57// CHECK: DONE
58