1 // RUN: %clang_tsan %darwin_min_target_with_tls_support %s -o %t
2 // RUN: %clang_tsan %darwin_min_target_with_tls_support %s -DBUILD_SO -fPIC -o \
3 // RUN: %t-so.so -shared
4 // RUN: %run %t 2>&1 | FileCheck %s
5 // XFAIL: netbsd
6
7 // Test that tsan cleans up dynamic TLS memory between reuse.
8
9 #include "test.h"
10
11 #ifndef BUILD_SO
12 #include <assert.h>
13 #include <dlfcn.h>
14
15 typedef volatile long *(* get_t)();
16 get_t GetTls;
17
Thread1(void * arg)18 void *Thread1(void *arg) {
19 pthread_detach(pthread_self());
20 volatile long *x = GetTls();
21 *x = 42;
22 fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
23 barrier_wait(&barrier);
24 return 0;
25 }
26
Thread2(void * arg)27 void *Thread2(void *arg) {
28 volatile long *x = GetTls();
29 *x = 42;
30 fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
31 return 0;
32 }
33
main(int argc,char * argv[])34 int main(int argc, char *argv[]) {
35 char path[4096];
36 snprintf(path, sizeof(path), "%s-so.so", argv[0]);
37
38 void *handle = dlopen(path, RTLD_LAZY);
39 if (!handle) fprintf(stderr, "%s\n", dlerror());
40 assert(handle != 0);
41 GetTls = (get_t)dlsym(handle, "GetTls");
42 assert(dlerror() == 0);
43
44 barrier_init(&barrier, 2);
45 pthread_t t[2];
46 pthread_create(&t[0], 0, Thread1, 0);
47 barrier_wait(&barrier);
48 // Wait for actual thread termination without using pthread_join,
49 // which would synchronize threads.
50 sleep(1);
51 pthread_create(&t[1], 0, Thread2, 0);
52 pthread_join(t[1], 0);
53 fprintf(stderr, "DONE\n");
54 return 0;
55 }
56 #else // BUILD_SO
57 __thread long huge_thread_local_array[1 << 17];
GetTls()58 long *GetTls() {
59 return &huge_thread_local_array[0];
60 }
61 #endif
62
63 // CHECK-NOT: ThreadSanitizer: data race
64 // CHECK: DONE
65