1 files changed, 93 insertions, 0 deletions
diff --git a/libcxx/src/condition_variable.cpp b/libcxx/src/condition_variable.cpp
new file mode 100644
index 000000000000..bf89d255dd82
--- /dev/null
+++ b/libcxx/src/condition_variable.cpp
@@ -0,0 +1,93 @@
+//===-------------------- condition_variable.cpp --------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "__config"
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+
+#include "condition_variable"
+#include "thread"
+#include "system_error"
+#include "__undef_macros"
+
+#if defined(__unix__) && !defined(__ANDROID__) && defined(__ELF__) && defined(_LIBCPP_HAS_COMMENT_LIB_PRAGMA)
+#pragma comment(lib, "pthread")
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// ~condition_variable is defined elsewhere.
+
+void
+condition_variable::notify_one() _NOEXCEPT
+{
+    __libcpp_condvar_signal(&__cv_);
+}
+
+void
+condition_variable::notify_all() _NOEXCEPT
+{
+    __libcpp_condvar_broadcast(&__cv_);
+}
+
+void
+condition_variable::wait(unique_lock<mutex>& lk) _NOEXCEPT
+{
+    if (!lk.owns_lock())
+        __throw_system_error(EPERM,
+                                  "condition_variable::wait: mutex not locked");
+    int ec = __libcpp_condvar_wait(&__cv_, lk.mutex()->native_handle());
+    if (ec)
+        __throw_system_error(ec, "condition_variable wait failed");
+}
+
+void
+condition_variable::__do_timed_wait(unique_lock<mutex>& lk,
+     chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) _NOEXCEPT
+{
+    using namespace chrono;
+    if (!lk.owns_lock())
+        __throw_system_error(EPERM,
+                            "condition_variable::timed wait: mutex not locked");
+    nanoseconds d = tp.time_since_epoch();
+    if (d > nanoseconds(0x59682F000000E941))
+        d = nanoseconds(0x59682F000000E941);
+    __libcpp_timespec_t ts;
+    seconds s = duration_cast<seconds>(d);
+    typedef decltype(ts.tv_sec) ts_sec;
+    _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
+    if (s.count() < ts_sec_max)
+    {
+        ts.tv_sec = static_cast<ts_sec>(s.count());
+        ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
+    }
+    else
+    {
+        ts.tv_sec = ts_sec_max;
+        ts.tv_nsec = giga::num - 1;
+    }
+    int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts);
+    if (ec != 0 && ec != ETIMEDOUT)
+        __throw_system_error(ec, "condition_variable timed_wait failed");
+}
+
+void
+notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk)
+{
+    auto& tl_ptr = __thread_local_data();
+    // If this thread was not created using std::thread then it will not have
+    // previously allocated.
+    if (tl_ptr.get() == nullptr) {
+        tl_ptr.set_pointer(new __thread_struct);
+    }
+    __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release());
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !_LIBCPP_HAS_NO_THREADS