86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <condition_variable>
|
|
|
|
// class condition_variable;
|
|
|
|
// template <class Rep, class Period>
|
|
// cv_status
|
|
// wait_for(unique_lock<mutex>& lock,
|
|
// const chrono::duration<Rep, Period>& rel_time);
|
|
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
#include <thread>
|
|
#include <chrono>
|
|
#include <cassert>
|
|
|
|
std::condition_variable cv;
|
|
std::mutex mut;
|
|
|
|
int test1 = 0;
|
|
int test2 = 0;
|
|
|
|
int runs = 0;
|
|
|
|
void f()
|
|
{
|
|
typedef std::chrono::system_clock Clock;
|
|
typedef std::chrono::milliseconds milliseconds;
|
|
std::unique_lock<std::mutex> lk(mut);
|
|
assert(test2 == 0);
|
|
test1 = 1;
|
|
cv.notify_one();
|
|
Clock::time_point t0 = Clock::now();
|
|
while (test2 == 0 &&
|
|
cv.wait_for(lk, milliseconds(250)) == std::cv_status::no_timeout)
|
|
;
|
|
Clock::time_point t1 = Clock::now();
|
|
if (runs == 0)
|
|
{
|
|
assert(t1 - t0 < milliseconds(250));
|
|
assert(test2 != 0);
|
|
}
|
|
else
|
|
{
|
|
assert(t1 - t0 - milliseconds(250) < milliseconds(5));
|
|
assert(test2 == 0);
|
|
}
|
|
++runs;
|
|
}
|
|
|
|
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();
|
|
}
|
|
test1 = 0;
|
|
test2 = 0;
|
|
{
|
|
std::unique_lock<std::mutex>lk(mut);
|
|
std::thread t(f);
|
|
assert(test1 == 0);
|
|
while (test1 == 0)
|
|
cv.wait(lk);
|
|
assert(test1 != 0);
|
|
lk.unlock();
|
|
t.join();
|
|
}
|
|
}
|