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* random.c (random_s_rand): ensure default PRNG is re-initialized

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after fork.  patched by Eric Wong.  [ruby-core:41209][Bug #5661]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2012-03-11 22:03:36 +00:00
parent 06279f0e4a
commit b87f2fe1e4
3 changed files with 37 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Mon Mar 12 07:03:32 2012 Nobuyoshi Nakada <nobu@ruby-lang.org>
* random.c (random_s_rand): ensure default PRNG is re-initialized
after fork. patched by Eric Wong. [ruby-core:41209][Bug #5661]
Sun Mar 11 23:57:29 2012 NARUSE, Yui <naruse@ruby-lang.org>
* pack.c (pack_unpack): when unpack('M') occurs an illegal byte

1
random.c
View file

@ -1293,6 +1293,7 @@ rb_f_rand(int argc, VALUE *argv, VALUE obj)
static VALUE
random_s_rand(int argc, VALUE *argv, VALUE obj)
{
rand_start(&default_rand);
return random_rand(argc, argv, rb_Random_DEFAULT);
}

33
test/ruby/test_rand.rb
View file

@ -415,14 +415,43 @@ END
def test_fork_shuffle
pid = fork do
(1..10).to_a.shuffle
raise 'default seed is not set' if srand == 0
(1..10).to_a.shuffle
raise 'default seed is not set' if srand == 0
end
p2, st = Process.waitpid2(pid)
assert(st.success?, "#{st.inspect}")
rescue NotImplementedError, ArgumentError
end
def assert_fork_status(n, mesg, &block)
IO.pipe do |r, w|
(1..n).map do
p1 = fork {w.puts(block.call.to_s)}
_, st = Process.waitpid2(p1)
assert_send([st, :success?], mesg)
r.gets.strip
end
end
end
def test_rand_reseed_on_fork
bug5661 = '[ruby-core:41209]'
assert_fork_status(1, bug5661) {Random.rand(4)}
r1, r2 = *assert_fork_status(2, bug5661) {Random.rand}
assert_not_equal(r1, r2, bug5661)
assert_fork_status(1, bug5661) {rand(4)}
r1, r2 = *assert_fork_status(2, bug5661) {rand}
assert_not_equal(r1, r2, bug5661)
stable = Random.new
assert_fork_status(1, bug5661) {stable.rand(4)}
r1, r2 = *assert_fork_status(2, bug5661) {stable.rand}
assert_equal(r1, r2, bug5661)
rescue NotImplementedError
end
def test_seed
bug3104 = '[ruby-core:29292]'
rand_1 = Random.new(-1).rand