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require 'rspec/support/reentrant_mutex'
require 'thread_order'
# There are no assertions specifically
# They are pass if they don't deadlock
RSpec.describe RSpec::Support::ReentrantMutex do
let!(:mutex) { described_class.new }
let!(:order) { ThreadOrder.new }
after { order.apocalypse! }
it 'can repeatedly synchronize within the same thread' do
mutex.synchronize { mutex.synchronize { } }
end
it 'locks other threads out while in the synchronize block' do
order.declare(:before) { mutex.synchronize { } }
order.declare(:within) { mutex.synchronize { } }
order.declare(:after) { mutex.synchronize { } }
order.pass_to :before, :resume_on => :exit
mutex.synchronize { order.pass_to :within, :resume_on => :sleep }
order.pass_to :after, :resume_on => :exit
end
it 'resumes the next thread once all its synchronize blocks have completed' do
order.declare(:thread) { mutex.synchronize { } }
mutex.synchronize { order.pass_to :thread, :resume_on => :sleep }
order.join_all
end
if RUBY_VERSION >= '3.0'
it 'waits when trying to lock from another Fiber' do
mutex.synchronize do
ready = false
f = Fiber.new do
expect {
ready = true
mutex.send(:enter)
raise 'should reach here: mutex is already locked on different Fiber'
}.to raise_error(Exception, 'waited correctly')
end
main_thread = Thread.current
t = Thread.new do
Thread.pass until ready && main_thread.stop?
main_thread.raise Exception, 'waited correctly'
end
f.resume
t.join
end
end
end
end
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