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#pragma once
#include <type_traits>
#include <new>
#include <utility> // [[since C++14]]: std::exchange
#include <algorithm>
#include <atomic>
#include <tuple>
#include <thread>
#include <chrono>
#include <string>
#include <cassert> // assert
#include "libipc/def.h"
#include "libipc/shm.h"
#include "libipc/rw_lock.h"
#include "libipc/utility/log.h"
#include "libipc/platform/detail.h"
#include "libipc/circ/elem_def.h"
namespace ipc {
namespace detail {
class queue_conn {
protected:
circ::cc_t connected_ = 0;
shm::handle elems_h_;
template <typename Elems>
Elems* open(char const * name) {
if (name == nullptr || name[0] == '\0') {
ipc::error("fail open waiter: name is empty!\n");
return nullptr;
}
if (!elems_h_.acquire(name, sizeof(Elems))) {
return nullptr;
}
auto elems = static_cast<Elems*>(elems_h_.get());
if (elems == nullptr) {
ipc::error("fail acquire elems: %s\n", name);
return nullptr;
}
elems->init();
return elems;
}
void close() {
elems_h_.release();
}
public:
queue_conn() = default;
queue_conn(const queue_conn&) = delete;
queue_conn& operator=(const queue_conn&) = delete;
bool connected() const noexcept {
return connected_ != 0;
}
circ::cc_t connected_id() const noexcept {
return connected_;
}
template <typename Elems>
auto connect(Elems* elems) noexcept
/*needs 'optional' here*/
-> std::tuple<bool, bool, decltype(std::declval<Elems>().cursor())> {
if (elems == nullptr) return {};
// if it's already connected, just return
if (connected()) return {connected(), false, 0};
connected_ = elems->connect_receiver();
return {connected(), true, elems->cursor()};
}
template <typename Elems>
bool disconnect(Elems* elems) noexcept {
if (elems == nullptr) return false;
// if it's already disconnected, just return false
if (!connected()) return false;
elems->disconnect_receiver(std::exchange(connected_, 0));
return true;
}
};
template <typename Elems>
class queue_base : public queue_conn {
using base_t = queue_conn;
public:
using elems_t = Elems;
using policy_t = typename elems_t::policy_t;
protected:
elems_t * elems_ = nullptr;
decltype(std::declval<elems_t>().cursor()) cursor_ = 0;
bool sender_flag_ = false;
public:
using base_t::base_t;
queue_base() = default;
explicit queue_base(char const * name)
: queue_base{} {
elems_ = open<elems_t>(name);
}
explicit queue_base(elems_t * elems) noexcept
: queue_base{} {
assert(elems != nullptr);
elems_ = elems;
}
/* not virtual */ ~queue_base() {
base_t::close();
}
elems_t * elems() noexcept { return elems_; }
elems_t const * elems() const noexcept { return elems_; }
bool ready_sending() noexcept {
if (elems_ == nullptr) return false;
return sender_flag_ || (sender_flag_ = elems_->connect_sender());
}
void shut_sending() noexcept {
if (elems_ == nullptr) return;
if (!sender_flag_) return;
elems_->disconnect_sender();
}
bool connect() noexcept {
auto tp = base_t::connect(elems_);
if (std::get<0>(tp) && std::get<1>(tp)) {
cursor_ = std::get<2>(tp);
return true;
}
return std::get<0>(tp);
}
bool disconnect() noexcept {
return base_t::disconnect(elems_);
}
std::size_t conn_count() const noexcept {
return (elems_ == nullptr) ? static_cast<std::size_t>(invalid_value) : elems_->conn_count();
}
bool valid() const noexcept {
return elems_ != nullptr;
}
bool empty() const noexcept {
return !valid() || (cursor_ == elems_->cursor());
}
template <typename T, typename F, typename... P>
bool push(F&& prep, P&&... params) {
if (elems_ == nullptr) return false;
return elems_->push(this, [&](void* p) {
if (prep(p)) ::new (p) T(std::forward<P>(params)...);
});
}
template <typename T, typename F, typename... P>
bool force_push(F&& prep, P&&... params) {
if (elems_ == nullptr) return false;
return elems_->force_push(this, [&](void* p) {
if (prep(p)) ::new (p) T(std::forward<P>(params)...);
});
}
template <typename T, typename F>
bool pop(T& item, F&& out) {
if (elems_ == nullptr) {
return false;
}
return elems_->pop(this, &(this->cursor_), [&item](void* p) {
::new (&item) T(std::move(*static_cast<T*>(p)));
}, std::forward<F>(out));
}
};
} // namespace detail
template <typename T, typename Policy>
class queue final : public detail::queue_base<typename Policy::template elems_t<sizeof(T), alignof(T)>> {
using base_t = detail::queue_base<typename Policy::template elems_t<sizeof(T), alignof(T)>>;
public:
using value_t = T;
using base_t::base_t;
template <typename... P>
bool push(P&&... params) {
return base_t::template push<T>(std::forward<P>(params)...);
}
template <typename... P>
bool force_push(P&&... params) {
return base_t::template force_push<T>(std::forward<P>(params)...);
}
bool pop(T& item) {
return base_t::pop(item, [](bool) {});
}
template <typename F>
bool pop(T& item, F&& out) {
return base_t::pop(item, std::forward<F>(out));
}
};
} // namespace ipc
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