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allow to access ivars of frozen shareable objects

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Accessing a shareable object is prohibitted because it can cause
race condition, but if the shareable object is frozen, there is no
problem to access ivars.
This commit is contained in:
Koichi Sasada 2020-10-22 00:36:53 +09:00
parent 9629378477
commit 0c0d0752f1
2 changed files with 14 additions and 1 deletions
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12
bootstraptest/test_ractor.rb
View file

@ -734,6 +734,18 @@ assert_equal 'can not access instance variables of shareable objects from non-ma
end
}
# But a sharable object is frozen, it is allowed to access ivars from non-main Ractor
assert_equal '11', %q{
[Object.new, [], ].map{|obj|
obj.instance_variable_set('@a', 1)
Ractor.make_shareable obj = obj.freeze
Ractor.new obj do |obj|
obj.instance_variable_get('@a')
end.take.to_s
}.join
}
# cvar in sharable-objects are not allowed to access from non-main Ractor
assert_equal 'can not access class variables from non-main Ractors', %q{
class C

3
variable.c
View file

@ -922,7 +922,8 @@ generic_ivtbl(VALUE obj, ID id, bool force_check_ractor)
{
ASSERT_vm_locking();
if ((force_check_ractor || rb_is_instance_id(id)) && // not internal ID
if ((force_check_ractor || LIKELY(rb_is_instance_id(id)) /* not internal ID */ ) &&
!RB_OBJ_FROZEN_RAW(obj) &&
UNLIKELY(!rb_ractor_main_p()) &&
UNLIKELY(rb_ractor_shareable_p(obj))) {
rb_raise(rb_eRuntimeError, "can not access instance variables of shareable objects from non-main Ractors");