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https://github.com/mutouyun/cpp-ipc.git
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874e0b25bc
ISSUE: MSVC compiler reports warning C4138: '*/' found outside of comment for patterns like 'void */*p*/' where the pointer asterisk is immediately followed by a comment start. AFFECTED FILES: - include/libipc/mem/new.h (line 30) - src/libipc/platform/win/mutex.h (line 54) - src/libipc/platform/win/semaphore.h (line 53) CHANGES: Changed 'type */*param*/' to 'type * /*param*/' (added space before comment) Examples: - void */*p*/ → void * /*p*/ - char const */*name*/ → char const * /*name*/ This resolves the MSVC warning while maintaining code functionality and keeping the commented-out parameter names for documentation.
118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/**
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* \file libipc/mem.h
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* \author mutouyun (orz@orzz.org)
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* \brief Global memory management.
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*/
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#pragma once
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#include <cstddef>
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#include <algorithm>
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#include <type_traits>
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#include <limits>
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#include <tuple>
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#include "libipc/imp/aligned.h"
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#include "libipc/imp/uninitialized.h"
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#include "libipc/imp/byte.h"
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#include "libipc/imp/detect_plat.h"
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#include "libipc/imp/export.h"
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#include "libipc/mem/memory_resource.h"
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#include "libipc/mem/block_pool.h"
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namespace ipc {
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namespace mem {
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/// \brief Defines the memory block collector interface.
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class LIBIPC_EXPORT block_collector {
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public:
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virtual ~block_collector() noexcept = default;
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virtual void *allocate(std::size_t /*bytes*/) noexcept = 0;
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virtual void deallocate(void * /*p*/, std::size_t /*bytes*/) noexcept = 0;
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};
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/// \brief Matches the appropriate memory block resource based on a specified size.
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LIBIPC_EXPORT block_collector &get_regular_resource(std::size_t s) noexcept;
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/// \brief Allocates storage with a size of at least bytes bytes.
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LIBIPC_EXPORT void *alloc(std::size_t bytes) noexcept;
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LIBIPC_EXPORT void free (void *p, std::size_t bytes) noexcept;
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namespace detail_new {
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#if defined(LIBIPC_CPP_17)
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using recycle_t = void (*)(void *p) noexcept;
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#else
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using recycle_t = void (*)(void *p);
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#endif
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static constexpr std::size_t recycler_size = round_up(sizeof(recycle_t), alignof(std::size_t));
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static constexpr std::size_t allocated_size = sizeof(std::size_t);
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static constexpr std::size_t regular_head_size = round_up(recycler_size + allocated_size, alignof(std::max_align_t));
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template <typename T>
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struct do_allocate {
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template <typename... A>
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static T *apply(A &&... args) noexcept {
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void *b = mem::alloc(regular_head_size + sizeof(T));
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auto *p = static_cast<byte *>(b) + regular_head_size;
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LIBIPC_TRY {
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T *t = construct<T>(p, std::forward<A>(args)...);
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*reinterpret_cast<recycle_t *>(b)
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= [](void *p) noexcept {
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mem::free(static_cast<byte *>(destroy(static_cast<T *>(p))) - regular_head_size
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, regular_head_size + sizeof(T));
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};
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return t;
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} LIBIPC_CATCH(...) {
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return nullptr;
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}
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}
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};
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template <>
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struct do_allocate<void> {
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static void *apply(std::size_t bytes) noexcept {
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if (bytes == 0) return nullptr;
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std::size_t rbz = regular_head_size + bytes;
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void *b = mem::alloc(rbz);
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*reinterpret_cast<recycle_t *>(b)
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= [](void *p) noexcept {
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auto *b = static_cast<byte *>(p) - regular_head_size;
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mem::free(b, *reinterpret_cast<std::size_t *>(b + recycler_size));
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};
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auto *z = static_cast<byte *>(b) + recycler_size;
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*reinterpret_cast<std::size_t *>(z) = rbz;
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return static_cast<byte *>(b) + regular_head_size;
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}
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};
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} // namespace detail_new
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/// \brief Creates an object based on the specified type and parameters with block pool resource.
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/// \note This function is thread-safe.
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template <typename T, typename... A>
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T *$new(A &&... args) noexcept {
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return detail_new::do_allocate<T>::apply(std::forward<A>(args)...);
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}
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/// \brief Destroys object previously allocated by the `$new` and releases obtained memory area.
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/// \note This function is thread-safe. If the pointer type passed in is different from `$new`,
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/// additional performance penalties may be incurred.
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inline void $delete(void *p) noexcept {
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if (p == nullptr) return;
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auto *r = reinterpret_cast<detail_new::recycle_t *>(static_cast<byte *>(p) - detail_new::regular_head_size);
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(*r)(p);
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}
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/// \brief The destruction policy used by std::unique_ptr.
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/// \see https://en.cppreference.com/w/cpp/memory/default_delete
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struct deleter {
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template <typename T>
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void operator()(T *p) const noexcept {
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$delete(p);
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}
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};
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} // namespace mem
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} // namespace ipc
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