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Bug #9905
closedFiber does not work on AIX
Description
test/ruby/test_fiber.rb
fails on AIX.
[ 2/23] TestFiber#test_argument/ss/home/rayod/Dev/Contribution/ruby-trunk-blue1/test/ruby/test_fiber.rb:19: [BUG] machine_stack_cache size is not canonicalized
ruby 2.2.0dev (2014-06-02 trunk 45270) [powerpc-aix7.1.0.0]
Here is what happens for this test:
- A fiber is created by setting
context->uc_stack.ss_size
to a certain value and callingmakecontext()
. - While the fiber is switched with other fibers by
swapcontext()
,context->uc_stack.ss_size
is changed to a very large value by AIX. - When the fiber finishes, its stack pointer and size are cached in
machine_stack_cache[]
. - When a new fiber is created, a specified stack size is different from the cached stack size, so the error is thrown.
I feel AIX's behavior is strange, but I also suppose in general, context->uc_stack.ss_size
is not guaranteed to be preserved after makecontext()
or swapcontext()
. (Please correct me if I am wrong.)
Rather than disabling FIBER_USE_NATIVE
for AIX, I propose saving the original stack pointer and size not in ucontext_t
but in new dedicated fields in rb_fiber_t
, as you can find in the attached patch. With this patch, test/ruby/test_fiber.rb
results in no errors on AIX. This did not cause any error on Linux, either, for test or test-all.
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