40db2c0ba1
Per-cpu value list registry with polling -> udp send - Allows registration of metric values associated with collectd id path (plugin/[plugin-inst/]type[/type-instance]). - Values are broadcast/sent at periodic intervals. (config) - Config through seastar.conf / app-template. - Value registration can be revoked safely, either manually or through anchor. Signed-off-by: Calle Wilund <calle@cloudius-systems.com>
98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef BYTEORDER_HH_
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#define BYTEORDER_HH_
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#include <arpa/inet.h> // for ntohs() and friends
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inline uint64_t ntohq(uint64_t v) {
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return __builtin_bswap64(v);
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}
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inline uint64_t htonq(uint64_t v) {
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return __builtin_bswap64(v);
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}
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namespace net {
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inline void ntoh() {}
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inline void hton() {}
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inline void ntoh(uint16_t& x) { x = ntohs(x); }
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inline void hton(uint16_t& x) { x = htons(x); }
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inline void ntoh(uint32_t& x) { x = ntohl(x); }
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inline void hton(uint32_t& x) { x = htonl(x); }
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inline void ntoh(uint64_t& x) { x = ntohq(x); }
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inline void hton(uint64_t& x) { x = htonq(x); }
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// Wrapper around a primitive type to provide an unaligned version.
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// This is because gcc (correctly) doesn't allow binding an unaligned
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// scalar variable to a reference, and (unfortunately) doesn't allow
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// specifying unaligned references.
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//
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// So, packed<uint32_t>& is our way of passing a reference (or pointer)
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// to a uint32_t around, without losing the knowledge about its alignment
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// or lack thereof.
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template <typename T>
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struct packed {
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T raw;
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packed() = default;
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packed(T x) : raw(x) {}
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packed& operator=(const T& x) { raw = x; return *this; }
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operator T() const { return raw; }
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template <typename Adjuster>
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void adjust_endianness(Adjuster a) { a(raw); }
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} __attribute__((packed));
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template <typename T>
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inline void ntoh(packed<T>& x) {
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T v = x;
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ntoh(v);
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x = v;
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}
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template <typename T>
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inline void hton(packed<T>& x) {
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T v = x;
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hton(v);
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x = v;
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}
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template <typename T>
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inline std::ostream& operator<<(std::ostream& os, const packed<T>& v) {
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auto x = v.raw;
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return os << x;
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}
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template <typename First, typename... Rest>
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inline
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void ntoh(First& first, Rest&... rest) {
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ntoh(first);
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ntoh(std::forward<Rest&>(rest)...);
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}
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template <typename First, typename... Rest>
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inline
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void hton(First& first, Rest&... rest) {
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hton(first);
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hton(std::forward<Rest&>(rest)...);
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}
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template <class T>
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inline
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void ntoh(T& x) {
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x.adjust_endianness([] (auto&... what) { ntoh(std::forward<decltype(what)&>(what)...); });
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}
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template <class T>
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inline
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void hton(T& x) {
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x.adjust_endianness([] (auto&... what) { hton(std::forward<decltype(what)&>(what)...); });
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}
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}
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#endif /* BYTEORDER_HH_ */
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