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//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // UNSUPPORTED: libcpp-has-no-threads // REQUIRES: thread-safety // <mutex> // MODULES_DEFINES: _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS #define _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS #include <mutex> std::mutex m; int foo __attribute__((guarded_by(m))); int main() { std::lock_guard<std::mutex> lock(m); foo++; }