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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
// <shared_mutex>
// template <class Mutex> class shared_lock;
// explicit shared_lock(mutex_type& m);
#include <shared_mutex>
#include <thread>
#include <vector>
#include <cstdlib>
#include <cassert>
#if _LIBCPP_STD_VER > 11
std::shared_timed_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();
time_point t1;
{
std::shared_lock<std::shared_timed_mutex> ul(m);
t1 = Clock::now();
}
ns d = t1 - t0 - ms(250);
assert(d < ms(50)); // within 50ms
}
void g()
{
time_point t0 = Clock::now();
time_point t1;
{
std::shared_lock<std::shared_timed_mutex> ul(m);
t1 = Clock::now();
}
ns d = t1 - t0;
assert(d < ms(50)); // within 50ms
}
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
m.lock();
std::vector<std::thread> v;
for (int i = 0; i < 5; ++i)
v.push_back(std::thread(f));
std::this_thread::sleep_for(ms(250));
m.unlock();
for (auto& t : v)
t.join();
m.lock_shared();
for (auto& t : v)
t = std::thread(g);
std::thread q(f);
std::this_thread::sleep_for(ms(250));
m.unlock_shared();
for (auto& t : v)
t.join();
q.join();
#endif // _LIBCPP_STD_VER > 11
}
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