68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// ALLOW_RETRIES: 2
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// <condition_variable>
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// class condition_variable;
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// template <class Predicate>
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// void wait(unique_lock<mutex>& lock, Predicate pred);
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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#include <functional>
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#include <cassert>
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#include "make_test_thread.h"
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#include "test_macros.h"
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std::condition_variable cv;
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std::mutex mut;
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int test1 = 0;
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int test2 = 0;
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class Pred
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{
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int& i_;
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public:
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explicit Pred(int& i) : i_(i) {}
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bool operator()() {return i_ != 0;}
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};
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void f()
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{
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std::unique_lock<std::mutex> lk(mut);
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assert(test2 == 0);
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test1 = 1;
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cv.notify_one();
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cv.wait(lk, Pred(test2));
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assert(test2 != 0);
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}
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int main(int, char**)
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{
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std::unique_lock<std::mutex>lk(mut);
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std::thread t = support::make_test_thread(f);
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assert(test1 == 0);
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while (test1 == 0)
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cv.wait(lk);
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assert(test1 != 0);
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test2 = 1;
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lk.unlock();
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cv.notify_one();
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t.join();
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return 0;
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}
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