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Use MAP_SHARED to allow sharing memory between processing #11733

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Use MAP_SHARED to allow sharing memory between processing #11733

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5e4b2f1
Use MAP_SHARED to allow sharing memory between processing
shoumikhin Jun 16, 2025
683fa14
Merge branch 'main' into shoumikhin-patch-2
shoumikhin Jun 16, 2025
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7 changes: 3 additions & 4 deletions extension/data_loader/mmap_data_loader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -193,14 +193,13 @@ Result<FreeableBuffer> MmapDataLoader::load(
map_size = file_size_ - range.start;
}

// Map the pages read-only. MAP_PRIVATE vs. MAP_SHARED doesn't matter since
// the data is read-only, but use PRIVATE just to further avoid accidentally
// modifying the file.
// Map the pages read-only. Use shared mappings so that other processes
// can also map the same pages and share the same memory.
void* pages = ::mmap(
nullptr,
map_size,
PROT_READ,
MAP_PRIVATE,
MAP_SHARED,
fd_,
static_cast<off_t>(range.start));
ET_CHECK_OR_RETURN_ERROR(
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