Spaces:
Sleeping
Sleeping
File size: 5,925 Bytes
77408f7 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 |
#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
|