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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.
//
//===----------------------------------------------------------------------===//
// <condition_variable>
// class condition_variable;
// template <class Predicate>
// void wait(unique_lock<mutex>& lock, Predicate pred);
#include <condition_variable>
#include <mutex>
#include <thread>
#include <functional>
#include <cassert>
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<std::mutex> lk(mut);
assert(test2 == 0);
test1 = 1;
cv.notify_one();
cv.wait(lk, Pred(test2));
assert(test2 != 0);
}
int main()
{
std::unique_lock<std::mutex>lk(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();
}
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