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//===----------------------------------------------------------------------===//
//
// 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
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