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require_relative '../../../spec_helper'
describe "IO::Buffer#locked" do
after :each do
@buffer&.free
@buffer = nil
end
context "when buffer is locked" do
it "allows reading and writing operations on the buffer" do
@buffer = IO::Buffer.new(4)
@buffer.set_string("test")
@buffer.locked do
@buffer.get_string.should == "test"
@buffer.set_string("meat")
end
@buffer.get_string.should == "meat"
end
it "disallows operations changing buffer itself, raising IO::Buffer::LockedError" do
@buffer = IO::Buffer.new(4)
@buffer.locked do
# Just an example, each method is responsible for checking the lock state.
-> { @buffer.resize(8) }.should raise_error(IO::Buffer::LockedError)
end
end
end
it "disallows reentrant locking, raising IO::Buffer::LockedError" do
@buffer = IO::Buffer.new(4)
@buffer.locked do
-> { @buffer.locked {} }.should raise_error(IO::Buffer::LockedError, "Buffer already locked!")
end
end
it "does not propagate to buffer's slices" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(0, 2)
@buffer.locked do
@buffer.locked?.should be_true
slice.locked?.should be_false
slice.locked { slice.locked?.should be_true }
end
end
it "does not propagate backwards from buffer's slices" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(0, 2)
slice.locked do
slice.locked?.should be_true
@buffer.locked?.should be_false
@buffer.locked { @buffer.locked?.should be_true }
end
end
end
describe "IO::Buffer#locked?" do
after :each do
@buffer&.free
@buffer = nil
end
it "is false by default" do
@buffer = IO::Buffer.new(4)
@buffer.locked?.should be_false
end
it "is true only inside of #locked block" do
@buffer = IO::Buffer.new(4)
@buffer.locked do
@buffer.locked?.should be_true
end
@buffer.locked?.should be_false
end
end
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