//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // class condition_variable; // template // void wait(unique_lock& lock, Predicate pred); #include #include #include #include #include std::condition_variable cv; std::mutex mut; int test1 = 0; int test2 = 0; class Pred { int& i_; public: explicit Pred(int& i) : i_(i) {} bool operator()() {return i_ != 0;} }; void f() { std::unique_lock lk(mut); assert(test2 == 0); test1 = 1; cv.notify_one(); cv.wait(lk, Pred(test2)); assert(test2 != 0); } int main() { std::unique_locklk(mut); std::thread t(f); assert(test1 == 0); while (test1 == 0) cv.wait(lk); assert(test1 != 0); test2 = 1; lk.unlock(); cv.notify_one(); t.join(); }