Antonio Cossari
57 lines
2.3 KiB
C++
57 lines
2.3 KiB
C++
/* ************************************************************************** */
|
|
/* */
|
|
/* ::: :::::::: */
|
|
/* EventToken.hpp :+: :+: :+: */
|
|
/* +:+ +:+ +:+ */
|
|
/* By: acossari <acossari@student.codam.nl> +#+ +:+ +#+ */
|
|
/* +#+#+#+#+#+ +#+ */
|
|
/* Created: 2026/08/25 13:26:42 by acossari #+# #+# */
|
|
/* Updated: 2026/08/25 19:06:13 by acossari ### ########.fr */
|
|
/* */
|
|
/* ************************************************************************** */
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
|
|
namespace webserv {
|
|
|
|
enum class EndpointKind {
|
|
ClientSocket,
|
|
CgiStdin,
|
|
CgiStdout,
|
|
Listener,
|
|
};
|
|
|
|
// Identifies which registered endpoint produced an epoll event without storing
|
|
// a pointer. For Listener, index selects a listener; for every other kind it
|
|
// selects a connection slot, while kind identifies its client socket or CGI
|
|
// pipe. epoll_wait() returns a batch in which an old event may remain after its
|
|
// endpoint has been retired and re-registered. generation distinguishes that
|
|
// old registration from the current one even when index and kind are equal.
|
|
//
|
|
// Packed layout in epoll_event.data.u64:
|
|
// bits 0-29 | index | 30 bits
|
|
// bits 30-31 | kind | 2 bits
|
|
// bits 32-63 | generation | 32 bits
|
|
struct EventToken {
|
|
static constexpr std::uint64_t INDEX_BITS = 30;
|
|
static constexpr std::uint64_t KIND_BITS = 2;
|
|
|
|
// List-initialization gives 1 the exact std::uint32_t type before shifting.
|
|
// std::uint32_t{1} << INDEX_BITS = 1,073,741,824
|
|
// (std::uint32_t{1} << INDEX_BITS) - 1 = 1,073,741,823
|
|
// Binary: 100...000 (30 zeros) - 1 = 011...111 (30 ones).
|
|
static constexpr std::uint32_t MAX_INDEX =
|
|
(std::uint32_t{1} << INDEX_BITS) - 1;
|
|
|
|
std::uint32_t index;
|
|
EndpointKind kind;
|
|
std::uint32_t generation;
|
|
};
|
|
|
|
std::uint64_t pack(EventToken token);
|
|
EventToken unpack(std::uint64_t token);
|
|
|
|
} // namespace webserv
|