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Activate flag MAP_POPULATE when compiled with -DMAP_POPULATE #14

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Activate flag MAP_POPULATE when compiled with -DMAP_POPULATE #14

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5 changes: 5 additions & 0 deletions lib/marisa/grimoire/io/mapper.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,12 @@ void Mapper::open_(const char *filename) {
fd_ = ::open(filename, O_RDONLY);
MARISA_THROW_IF(fd_ == -1, MARISA_IO_ERROR);

#ifdef MAP_POPULATE
origin_ = ::mmap(NULL, size_, PROT_READ, MAP_SHARED | MAP_POPULATE, fd_, 0);
#else
origin_ = ::mmap(NULL, size_, PROT_READ, MAP_SHARED, fd_, 0);
#endif

MARISA_THROW_IF(origin_ == MAP_FAILED, MARISA_IO_ERROR);

ptr_ = static_cast<const char *>(origin_);
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