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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Hash thread safety" do
it "supports concurrent #[]=" do
n_threads = ThreadSafetySpecs.processors
n = 1_000
operations = n * n_threads
h = {}
barrier = ThreadSafetySpecs::Barrier.new(n_threads + 1)
threads = n_threads.times.map { |t|
Thread.new {
barrier.wait
base = t * n
n.times do |j|
h[base+j] = t
end
}
}
barrier.wait
threads.each(&:join)
h.size.should == operations
h.each_pair { |key, value|
(key / n).should == value
}
end
# can't add a new key into hash during iteration (RuntimeError) on CRuby.
# Yet it's good to test this for implementations that support it.
guard_not -> { PlatformGuard.standard? } do
it "supports concurrent #[]= and #delete and iteration" do
n_threads = ThreadSafetySpecs.processors
n = 1_000
operations = n * n_threads / 2
h = {}
barrier1 = ThreadSafetySpecs::Barrier.new(n_threads + 2)
barrier2 = ThreadSafetySpecs::Barrier.new(n_threads + 1)
threads = n_threads.times.map { |t|
Thread.new {
barrier1.wait
base = t * n
n.times do |j|
h[base+j] = t
end
barrier2.wait
n.times do |j|
# delete only even keys
h.delete(base+j).should == t if (base+j).even?
end
}
}
read = true
reader = Thread.new {
barrier1.wait
while read
h.each_pair { |k,v|
k.should.is_a?(Integer)
v.should.is_a?(Integer)
(k / n).should == v
}
end
}
barrier1.wait
barrier2.wait
threads.each(&:join)
read = false
reader.join
# odd keys are left
h.size.should == operations
h.each_pair { |key, value|
key.should.odd?
(key / n).should == value
}
end
end
it "supports concurrent #[]= and #[]" do
n_threads = ThreadSafetySpecs.processors
n = 1_000
operations = n * n_threads / 2
h = {}
barrier = ThreadSafetySpecs::Barrier.new(n_threads + 1)
threads = n_threads.times.map { |t|
Thread.new {
barrier.wait
base = (t / 2) * n
if t.even?
n.times do |j|
k = base + j
h[k] = k
end
else
n.times do |j|
k = base + j
Thread.pass until v = h[k]
v.should == k
end
end
}
}
barrier.wait
threads.each(&:join)
h.size.should == operations
h.each_pair { |key, value|
key.should == value
}
end
it "supports concurrent #[]= and #[] with change to #compare_by_identity in the middle" do
n_threads = ThreadSafetySpecs.processors
n = 1_000
operations = n * n_threads / 2
h = {}
barrier = ThreadSafetySpecs::Barrier.new(n_threads + 1)
threads = n_threads.times.map { |t|
Thread.new {
barrier.wait
base = (t / 2) * n
if t.even?
n.times do |j|
k = base + j
h[k] = k
end
else
n.times do |j|
k = base + j
Thread.pass until v = h[k]
v.should == k
end
end
}
}
changer = Thread.new {
Thread.pass until h.size >= operations / 2
h.should_not.compare_by_identity?
h.compare_by_identity
h.should.compare_by_identity?
}
barrier.wait
threads.each(&:join)
changer.join
h.size.should == operations
h.each_pair { |key, value|
key.should == value
}
end
it "supports repeated concurrent #[]= and #delete and always returns a #size >= 0" do
n_threads = ThreadSafetySpecs.processors
n = 1_000
operations = n * n_threads / 2
h = {}
barrier = ThreadSafetySpecs::Barrier.new(n_threads + 1)
deleted = ThreadSafetySpecs::Counter.new
threads = n_threads.times.map { |t|
Thread.new {
barrier.wait
key = t / 2
if t.even?
n.times {
Thread.pass until h.delete(key)
h.size.should >= 0
deleted.increment
}
else
n.times {
h[key] = key
Thread.pass while h.key?(key)
}
end
}
}
barrier.wait
threads.each(&:join)
deleted.get.should == operations
h.size.should == 0
h.should.empty?
end
end
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