compiler-rt/test/tsan/fiber_race.cpp

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %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_uc;
  10 void *fiber, *orig_fiber;
  11
  12 int var;
  13
  14 void func() {
  15   var = 1;
  16   __tsan_switch_to_fiber(orig_fiber, __tsan_switch_to_fiber_no_sync);
  17   swapcontext(&uc, &orig_uc);
  18 }
  19
  20 int main() {
  21   orig_fiber = __tsan_get_current_fiber();
  22   fiber = __tsan_create_fiber(0);
  23   getcontext(&uc);
  24   uc.uc_stack.ss_sp = stack;
  25   uc.uc_stack.ss_size = sizeof(stack);
  26   uc.uc_link = 0;
  27   makecontext(&uc, func, 0);
  28   var = 2;
  29   __tsan_switch_to_fiber(fiber, __tsan_switch_to_fiber_no_sync);
  30   swapcontext(&orig_uc, &uc);
  31   __tsan_destroy_fiber(fiber);
  32   fprintf(stderr, "PASS\n");
  33   return 0;
  34 }
  35
  36 // CHECK: WARNING: ThreadSanitizer: data race
  37 // CHECK: PASS