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hash: move the random generator out of bees-hash.cc

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We need random numbers in more places, so centralize the engines.
Initialize with a proper random seed so every worker thread gets
different behavior.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-11-16 00:55:58 -05:00
parent 73f94750ec
commit ba694b4881
3 changed files with 14 additions and 4 deletions
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7
src/bees.cc
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@ -268,6 +268,13 @@ bees_unreadahead(int const fd, off_t offset, size_t size)
BEESCOUNTADD(readahead_unread_ms, unreadahead_timer.age() * 1000);
}
thread_local random_device bees_random_device;
thread_local uniform_int_distribution<default_random_engine::result_type> bees_random_seed_dist(
numeric_limits<default_random_engine::result_type>::min(),
numeric_limits<default_random_engine::result_type>::max()
);
thread_local default_random_engine bees_generator(bees_random_seed_dist(bees_random_device));
BeesStringFile::BeesStringFile(Fd dir_fd, string name, size_t limit) :
m_dir_fd(dir_fd),
m_name(name),