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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.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <mutex>
// class recursive_mutex;
// void lock();
#include <mutex>
#include <thread>
#include <cstdlib>
#include <cassert>
#include <iostream>
std::recursive_mutex m;
typedef std::chrono::system_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
void f()
{
time_point t0 = Clock::now();
m.lock();
time_point t1 = Clock::now();
m.lock();
m.unlock();
m.unlock();
ns d = t1 - t0 - ms(250);
assert(d < ms(200)); // within 200ms
}
int main()
{
m.lock();
std::thread t(f);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
}
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