index-pack: disable threading if NO_PREAD is defined
NO_PREAD simulates pread() as a sequence of seek, read, seek in compat/pread.c. The simulation is not thread-safe because another thread could move the file offset away in the middle of pread operation. Do not allow threading in that case. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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