ba898e4208
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@191127 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <shared_mutex>
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// class shared_mutex;
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// void lock_shared();
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#include <shared_mutex>
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#include <thread>
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#include <vector>
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#include <cstdlib>
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#include <cassert>
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#if _LIBCPP_STD_VER > 11
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std::shared_mutex m;
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typedef std::chrono::system_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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typedef std::chrono::milliseconds ms;
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typedef std::chrono::nanoseconds ns;
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void f()
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{
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time_point t0 = Clock::now();
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m.lock_shared();
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time_point t1 = Clock::now();
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m.unlock_shared();
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ns d = t1 - t0 - ms(250);
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assert(d < ms(50)); // within 50ms
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}
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void g()
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{
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time_point t0 = Clock::now();
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m.lock_shared();
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time_point t1 = Clock::now();
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m.unlock_shared();
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ns d = t1 - t0;
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assert(d < ms(50)); // within 50ms
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}
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#endif // _LIBCPP_STD_VER > 11
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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m.lock();
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std::vector<std::thread> v;
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for (int i = 0; i < 5; ++i)
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v.push_back(std::thread(f));
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std::this_thread::sleep_for(ms(250));
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m.unlock();
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for (auto& t : v)
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t.join();
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m.lock_shared();
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for (auto& t : v)
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t = std::thread(g);
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std::thread q(f);
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std::this_thread::sleep_for(ms(250));
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m.unlock_shared();
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for (auto& t : v)
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t.join();
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q.join();
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#endif // _LIBCPP_STD_VER > 11
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}
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