1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 // UNSUPPORTED: tvos, watchos
3 // XFAIL: ios && !iossim
4 #include "sanitizer_common/sanitizer_ucontext.h"
5 #include "test.h"
6 
7 char stack[64 * 1024] __attribute__((aligned(16)));
8 
9 ucontext_t uc, orig_uc1, orig_uc2;
10 void *fiber, *orig_fiber1, *orig_fiber2;
11 
12 int var;
13 
14 void *Thread(void *x) {
15   orig_fiber2 = __tsan_get_current_fiber();
16   swapcontext(&orig_uc2, &orig_uc1);
17   return 0;
18 }
19 
20 void func() {
21   pthread_t t;
22   pthread_create(&t, 0, Thread, 0);
23   pthread_join(t, 0);
24   __tsan_switch_to_fiber(orig_fiber1, 0);
25   swapcontext(&uc, &orig_uc1);
26 }
27 
28 int main() {
29   orig_fiber1 = __tsan_get_current_fiber();
30   fiber = __tsan_create_fiber(0);
31   getcontext(&uc);
32   uc.uc_stack.ss_sp = stack;
33   uc.uc_stack.ss_size = sizeof(stack);
34   uc.uc_link = 0;
35   makecontext(&uc, func, 0);
36   var = 1;
37   __tsan_switch_to_fiber(fiber, 0);
38   swapcontext(&orig_uc1, &uc);
39   var = 2;
40   __tsan_switch_to_fiber(orig_fiber2, 0);
41   swapcontext(&orig_uc1, &orig_uc2);
42   var = 3;
43   __tsan_destroy_fiber(fiber);
44   fprintf(stderr, "PASS\n");
45   return 0;
46 }
47 
48 // CHECK-NOT: WARNING: ThreadSanitizer:
49 // CHECK: PASS
50