tree 01d4ae97d8d952940f8b48c47b7f670315756e9b
parent 53df9ca28f6cfe9acf897579985ef6fcde13cb21
author Glenn Kasten <gkasten@google.com> 1307030368 -0700
committer Glenn Kasten <gkasten@google.com> 1307750866 -0700

Remove redundant memory barrier

pthread_create already includes the necessary memory barriers:
 - parent at pthread_create : pthread_mutex_unlock(start_mutex)
 - child at __thread_entry : pthread_mutex_lock(start_mutex)

Add lock around uses of mThread.

Added comments:
 - uses of mThread require lock
 - androidCreateRawThreadEtc returned ID is not safe for direct use from non-parent threads.

Change-Id: I18cb296b41ddaf64cf127b57aab31154319b5970