mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
86 lines
1.7 KiB
C++
86 lines
1.7 KiB
C++
#pragma once
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#include <cstddef>
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#include <sys/types.h>
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#if !defined(_MSC_VER)
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#include <sys/mman.h>
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#endif
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#ifdef MREMAP_MAYMOVE
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#define HAS_MREMAP 1
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#else
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#define HAS_MREMAP 0
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#endif
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/// You can forcely disable mremap by defining DISABLE_MREMAP to 1 before including this file.
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#ifndef DISABLE_MREMAP
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#if HAS_MREMAP
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#define DISABLE_MREMAP 0
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#else
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#define DISABLE_MREMAP 1
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#endif
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#endif
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/// Implement mremap with mmap/memcpy/munmap.
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void * mremap_fallback(
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void * old_address,
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size_t old_size,
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size_t new_size,
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int flags,
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int mmap_prot,
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int mmap_flags,
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int mmap_fd,
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off_t mmap_offset);
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#if !HAS_MREMAP
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#define MREMAP_MAYMOVE 1
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inline void * mremap(
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void * old_address,
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size_t old_size,
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size_t new_size,
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int flags = 0,
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int mmap_prot = 0,
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int mmap_flags = 0,
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int mmap_fd = -1,
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off_t mmap_offset = 0)
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{
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return mremap_fallback(old_address, old_size, new_size, flags, mmap_prot, mmap_flags, mmap_fd, mmap_offset);
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}
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#endif
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inline void * clickhouse_mremap(
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void * old_address,
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size_t old_size,
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size_t new_size,
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int flags = 0,
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[[maybe_unused]] int mmap_prot = 0,
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[[maybe_unused]] int mmap_flags = 0,
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[[maybe_unused]] int mmap_fd = -1,
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[[maybe_unused]] off_t mmap_offset = 0)
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{
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#if DISABLE_MREMAP
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return mremap_fallback(old_address, old_size, new_size, flags, mmap_prot, mmap_flags, mmap_fd, mmap_offset);
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#else
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return mremap(
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old_address,
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old_size,
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new_size,
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flags
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#if !defined(MREMAP_FIXED)
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,
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mmap_prot,
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mmap_flags,
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mmap_fd,
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mmap_offset
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#endif
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);
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#endif
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}
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