Summary:
- I noticed that sometimes mqueue_test in ostest failed
(i.e. mq_open failed) with rv-virt:smp.
- This commit fixes this issue by replacing sched_lock with
critical section.
Impact:
- file_mq_open()
Testing:
- Tested with ostest on QEMU-7.1
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>