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Fix potential race condition on CTS TC pthread_gettid_np
Root cause:
If start_routine thread exits before pthread_gettid_np is invokded, the "tid" field
will be cleared so that pthread_gettid_np will get "0" (which is cleared by kernel,
due to the flag "CLONE_CHILD_CLEARTID" is set while calling clone system call inside
pthread_create).
Proposed patch:
Use a mutex to guarantee pthread_gettid_np will be invoked and returned before the
start_routine exits
Signed-off-by: Junjie Hu <junjie.hu@mediatek.com>
Change-Id: I22411f1b0f7446d76a0373cef4ccec858fac7018