Release Cosmopolitan v3.6.0

This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23

third_party/libcxx/future.cpp

@@ -0,0 +1,197 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 <future>
+#include <string>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class _LIBCPP_HIDDEN __future_error_category : public __do_message {
+public:
+  virtual const char* name() const noexcept;
+  virtual string message(int ev) const;
+};
+
+const char* __future_error_category::name() const noexcept { return "future"; }
+
+_LIBCPP_DIAGNOSTIC_PUSH
+_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wswitch")
+_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wswitch")
+
+string __future_error_category::message(int ev) const {
+  switch (static_cast<future_errc>(ev)) {
+  case future_errc(0): // For backwards compatibility with C++11 (LWG 2056)
+  case future_errc::broken_promise:
+    return string("The associated promise has been destructed prior "
+                  "to the associated state becoming ready.");
+  case future_errc::future_already_retrieved:
+    return string("The future has already been retrieved from "
+                  "the promise or packaged_task.");
+  case future_errc::promise_already_satisfied:
+    return string("The state of the promise has already been set.");
+  case future_errc::no_state:
+    return string("Operation not permitted on an object without "
+                  "an associated state.");
+  }
+  return string("unspecified future_errc value\n");
+}
+
+_LIBCPP_DIAGNOSTIC_POP
+
+const error_category& future_category() noexcept {
+  union AvoidDestroyingFutureCategory {
+    __future_error_category future_error_category;
+    constexpr explicit AvoidDestroyingFutureCategory() : future_error_category() {}
+    ~AvoidDestroyingFutureCategory() {}
+  };
+  constinit static AvoidDestroyingFutureCategory helper;
+  return helper.future_error_category;
+}
+
+future_error::future_error(error_code __ec) : logic_error(__ec.message()), __ec_(__ec) {}
+
+future_error::~future_error() noexcept {}
+
+void __assoc_sub_state::__on_zero_shared() noexcept { delete this; }
+
+void __assoc_sub_state::set_value() {
+  unique_lock<mutex> __lk(__mut_);
+  if (__has_value())
+    __throw_future_error(future_errc::promise_already_satisfied);
+  __state_ |= __constructed | ready;
+  __cv_.notify_all();
+}
+
+void __assoc_sub_state::set_value_at_thread_exit() {
+  unique_lock<mutex> __lk(__mut_);
+  if (__has_value())
+    __throw_future_error(future_errc::promise_already_satisfied);
+  __state_ |= __constructed;
+  __thread_local_data()->__make_ready_at_thread_exit(this);
+}
+
+void __assoc_sub_state::set_exception(exception_ptr __p) {
+  unique_lock<mutex> __lk(__mut_);
+  if (__has_value())
+    __throw_future_error(future_errc::promise_already_satisfied);
+  __exception_ = __p;
+  __state_ |= ready;
+  __cv_.notify_all();
+}
+
+void __assoc_sub_state::set_exception_at_thread_exit(exception_ptr __p) {
+  unique_lock<mutex> __lk(__mut_);
+  if (__has_value())
+    __throw_future_error(future_errc::promise_already_satisfied);
+  __exception_ = __p;
+  __thread_local_data()->__make_ready_at_thread_exit(this);
+}
+
+void __assoc_sub_state::__make_ready() {
+  unique_lock<mutex> __lk(__mut_);
+  __state_ |= ready;
+  __cv_.notify_all();
+}
+
+void __assoc_sub_state::copy() {
+  unique_lock<mutex> __lk(__mut_);
+  __sub_wait(__lk);
+  if (__exception_ != nullptr)
+    rethrow_exception(__exception_);
+}
+
+void __assoc_sub_state::wait() {
+  unique_lock<mutex> __lk(__mut_);
+  __sub_wait(__lk);
+}
+
+void __assoc_sub_state::__sub_wait(unique_lock<mutex>& __lk) {
+  if (!__is_ready()) {
+    if (__state_ & static_cast<unsigned>(deferred)) {
+      __state_ &= ~static_cast<unsigned>(deferred);
+      __lk.unlock();
+      __execute();
+    } else
+      while (!__is_ready())
+        __cv_.wait(__lk);
+  }
+}
+
+void __assoc_sub_state::__execute() { __throw_future_error(future_errc::no_state); }
+
+future<void>::future(__assoc_sub_state* __state) : __state_(__state) { __state_->__attach_future(); }
+
+future<void>::~future() {
+  if (__state_)
+    __state_->__release_shared();
+}
+
+void future<void>::get() {
+  unique_ptr<__shared_count, __release_shared_count> __(__state_);
+  __assoc_sub_state* __s = __state_;
+  __state_               = nullptr;
+  __s->copy();
+}
+
+promise<void>::promise() : __state_(new __assoc_sub_state) {}
+
+promise<void>::~promise() {
+  if (__state_) {
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+    if (!__state_->__has_value() && __state_->use_count() > 1)
+      __state_->set_exception(make_exception_ptr(future_error(future_errc::broken_promise)));
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
+    __state_->__release_shared();
+  }
+}
+
+future<void> promise<void>::get_future() {
+  if (__state_ == nullptr)
+    __throw_future_error(future_errc::no_state);
+  return future<void>(__state_);
+}
+
+void promise<void>::set_value() {
+  if (__state_ == nullptr)
+    __throw_future_error(future_errc::no_state);
+  __state_->set_value();
+}
+
+void promise<void>::set_exception(exception_ptr __p) {
+  if (__state_ == nullptr)
+    __throw_future_error(future_errc::no_state);
+  __state_->set_exception(__p);
+}
+
+void promise<void>::set_value_at_thread_exit() {
+  if (__state_ == nullptr)
+    __throw_future_error(future_errc::no_state);
+  __state_->set_value_at_thread_exit();
+}
+
+void promise<void>::set_exception_at_thread_exit(exception_ptr __p) {
+  if (__state_ == nullptr)
+    __throw_future_error(future_errc::no_state);
+  __state_->set_exception_at_thread_exit(__p);
+}
+
+shared_future<void>::~shared_future() {
+  if (__state_)
+    __state_->__release_shared();
+}
+
+shared_future<void>& shared_future<void>::operator=(const shared_future& __rhs) {
+  if (__rhs.__state_)
+    __rhs.__state_->__add_shared();
+  if (__state_)
+    __state_->__release_shared();
+  __state_ = __rhs.__state_;
+  return *this;
+}
+
+_LIBCPP_END_NAMESPACE_STD