vendor/libc++/libc++-release_370-r246257

1 files changed, 254 insertions, 0 deletions

diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
new file mode 100644
index 000000000000..89b99348459b
--- /dev/null
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
@@ -0,0 +1,254 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// struct once_flag;
+
+// template<class Callable, class ...Args>
+//   void call_once(once_flag& flag, Callable&& func, Args&&... args);
+
+#include <mutex>
+#include <thread>
+#include <cassert>
+
+typedef std::chrono::milliseconds ms;
+
+std::once_flag flg0;
+
+int init0_called = 0;
+
+void init0()
+{
+    std::this_thread::sleep_for(ms(250));
+    ++init0_called;
+}
+
+void f0()
+{
+    std::call_once(flg0, init0);
+}
+
+std::once_flag flg3;
+
+int init3_called = 0;
+int init3_completed = 0;
+
+void init3()
+{
+    ++init3_called;
+    std::this_thread::sleep_for(ms(250));
+    if (init3_called == 1)
+        throw 1;
+    ++init3_completed;
+}
+
+void f3()
+{
+    try
+    {
+        std::call_once(flg3, init3);
+    }
+    catch (...)
+    {
+    }
+}
+
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+
+struct init1
+{
+    static int called;
+
+    void operator()(int i) {called += i;}
+};
+
+int init1::called = 0;
+
+std::once_flag flg1;
+
+void f1()
+{
+    std::call_once(flg1, init1(), 1);
+}
+
+struct init2
+{
+    static int called;
+
+    void operator()(int i, int j) const {called += i + j;}
+};
+
+int init2::called = 0;
+
+std::once_flag flg2;
+
+void f2()
+{
+    std::call_once(flg2, init2(), 2, 3);
+    std::call_once(flg2, init2(), 4, 5);
+}
+
+#endif  // _LIBCPP_HAS_NO_VARIADICS
+
+std::once_flag flg41;
+std::once_flag flg42;
+
+int init41_called = 0;
+int init42_called = 0;
+
+void init42();
+
+void init41()
+{
+    std::this_thread::sleep_for(ms(250));
+    ++init41_called;
+}
+
+void init42()
+{
+    std::this_thread::sleep_for(ms(250));
+    ++init42_called;
+}
+
+void f41()
+{
+    std::call_once(flg41, init41);
+    std::call_once(flg42, init42);
+}
+
+void f42()
+{
+    std::call_once(flg42, init42);
+    std::call_once(flg41, init41);
+}
+
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+
+class MoveOnly
+{
+#if !defined(__clang__)
+   // GCC 4.8 complains about the following being private
+public:
+    MoveOnly(const MoveOnly&)
+    {
+    }
+#else
+    MoveOnly(const MoveOnly&);
+#endif
+public:
+    MoveOnly() {}
+    MoveOnly(MoveOnly&&) {}
+
+    void operator()(MoveOnly&&)
+    {
+    }
+};
+
+class NonCopyable
+{
+#if !defined(__clang__)
+   // GCC 4.8 complains about the following being private
+public:
+    NonCopyable(const NonCopyable&)
+    {
+    }
+#else
+    NonCopyable(const NonCopyable&);
+#endif
+public:
+    NonCopyable() {}
+
+    void operator()(int&) {}
+};
+
+#if __cplusplus >= 201103L
+// reference qualifiers on functions are a C++11 extension
+struct RefQual
+{
+    int lv_called, rv_called;
+
+    RefQual() : lv_called(0), rv_called(0) {}
+
+    void operator()() & { ++lv_called; }
+    void operator()() && { ++rv_called; }
+};
+#endif
+#endif
+
+int main()
+{
+    // check basic functionality
+    {
+        std::thread t0(f0);
+        std::thread t1(f0);
+        t0.join();
+        t1.join();
+        assert(init0_called == 1);
+    }
+    // check basic exception safety
+    {
+        std::thread t0(f3);
+        std::thread t1(f3);
+        t0.join();
+        t1.join();
+        assert(init3_called == 2);
+        assert(init3_completed == 1);
+    }
+    // check deadlock avoidance
+    {
+        std::thread t0(f41);
+        std::thread t1(f42);
+        t0.join();
+        t1.join();
+        assert(init41_called == 1);
+        assert(init42_called == 1);
+    }
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+    // check functors with 1 arg
+    {
+        std::thread t0(f1);
+        std::thread t1(f1);
+        t0.join();
+        t1.join();
+        assert(init1::called == 1);
+    }
+    // check functors with 2 args
+    {
+        std::thread t0(f2);
+        std::thread t1(f2);
+        t0.join();
+        t1.join();
+        assert(init2::called == 5);
+    }
+    {
+        std::once_flag f;
+        std::call_once(f, MoveOnly(), MoveOnly());
+    }
+    // check LWG2442: call_once() shouldn't DECAY_COPY()
+    {
+        std::once_flag f;
+        int i = 0;
+        std::call_once(f, NonCopyable(), i);
+    }
+#if __cplusplus >= 201103L
+// reference qualifiers on functions are a C++11 extension
+    {
+        std::once_flag f1, f2;
+        RefQual rq;
+        std::call_once(f1, rq);
+        assert(rq.lv_called == 1);
+        std::call_once(f2, std::move(rq));
+        assert(rq.rv_called == 1);
+    }
+#endif
+#endif  // _LIBCPP_HAS_NO_VARIADICS
+}