fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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98 lines
2.4 KiB
98 lines
2.4 KiB
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "port/mmap.h"
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#include <cassert>
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#include <cstdio>
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#include <cstring>
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#include <new>
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#include <utility>
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#include "util/hash.h"
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namespace ROCKSDB_NAMESPACE {
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MemMapping::~MemMapping() {
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#ifdef OS_WIN
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if (addr_ != nullptr) {
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(void)::UnmapViewOfFile(addr_);
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}
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if (page_file_handle_ != NULL) {
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(void)::CloseHandle(page_file_handle_);
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}
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#else // OS_WIN -> !OS_WIN
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if (addr_ != nullptr) {
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auto status = munmap(addr_, length_);
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assert(status == 0);
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if (status != 0) {
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// TODO: handle error?
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}
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}
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#endif // OS_WIN
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}
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MemMapping::MemMapping(MemMapping&& other) noexcept {
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*this = std::move(other);
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}
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MemMapping& MemMapping::operator=(MemMapping&& other) noexcept {
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if (&other == this) {
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return *this;
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}
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this->~MemMapping();
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std::memcpy(this, &other, sizeof(*this));
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new (&other) MemMapping();
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return *this;
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}
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MemMapping MemMapping::AllocateAnonymous(size_t length, bool huge) {
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MemMapping mm;
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mm.length_ = length;
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assert(mm.addr_ == nullptr);
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if (length == 0) {
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// OK to leave addr as nullptr
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return mm;
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}
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int huge_flag = 0;
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#ifdef OS_WIN
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if (huge) {
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#ifdef FILE_MAP_LARGE_PAGES
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huge_flag = FILE_MAP_LARGE_PAGES;
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#endif // FILE_MAP_LARGE_PAGES
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}
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mm.page_file_handle_ = ::CreateFileMapping(
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INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE | SEC_COMMIT,
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Upper32of64(length), Lower32of64(length), nullptr);
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if (mm.page_file_handle_ == NULL) {
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// Failure
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return mm;
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}
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mm.addr_ = ::MapViewOfFile(mm.page_file_handle_, FILE_MAP_WRITE | huge_flag,
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0, 0, length);
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#else // OS_WIN -> !OS_WIN
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if (huge) {
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#ifdef MAP_HUGETLB
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huge_flag = MAP_HUGETLB;
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#endif // MAP_HUGE_TLB
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}
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mm.addr_ = mmap(nullptr, length, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | huge_flag, -1, 0);
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if (mm.addr_ == MAP_FAILED) {
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mm.addr_ = nullptr;
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}
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#endif // OS_WIN
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return mm;
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}
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MemMapping MemMapping::AllocateHuge(size_t length) {
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return AllocateAnonymous(length, /*huge*/ true);
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}
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MemMapping MemMapping::AllocateLazyZeroed(size_t length) {
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return AllocateAnonymous(length, /*huge*/ false);
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}
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} // namespace ROCKSDB_NAMESPACE
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