1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: libcpp-has-no-threads 11 // REQUIRES: thread-safety 12 13 // <mutex> 14 15 // MODULES_DEFINES: _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS 16 #define _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS 17 18 #include <mutex> 19 20 std::mutex m; 21 int foo __attribute__((guarded_by(m))); 22 23 int main() { 24 m.lock(); 25 foo++; 26 m.unlock(); 27 } 28
