forked from OSchip/llvm-project
86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <condition_variable>
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// class condition_variable;
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// template <class Rep, class Period>
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// cv_status
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// wait_for(unique_lock<mutex>& lock,
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// const chrono::duration<Rep, Period>& rel_time);
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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#include <chrono>
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#include <cassert>
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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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int runs = 0;
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void f()
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{
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typedef std::chrono::system_clock Clock;
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typedef std::chrono::milliseconds milliseconds;
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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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Clock::time_point t0 = Clock::now();
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while (test2 == 0 &&
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cv.wait_for(lk, milliseconds(250)) == std::cv_status::no_timeout)
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;
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Clock::time_point t1 = Clock::now();
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if (runs == 0)
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{
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assert(t1 - t0 < milliseconds(250));
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assert(test2 != 0);
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}
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else
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{
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assert(t1 - t0 - milliseconds(250) < milliseconds(5));
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assert(test2 == 0);
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}
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++runs;
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}
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int main()
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{
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{
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std::unique_lock<std::mutex>lk(mut);
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std::thread t(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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}
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test1 = 0;
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test2 = 0;
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{
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std::unique_lock<std::mutex>lk(mut);
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std::thread t(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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lk.unlock();
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t.join();
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}
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}
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