execution: PASS
main: attempt read lock
main: acquired read lock
main: create rd_thread1
rd_thread: attempt read lock
rd_thread: acquired read lock
rd_thread: unlock read lock
main: unlock read lock
main: attempt write lock
main: acquired write lock
main: create rd_thread2
rd_thread: attempt read lock
main: unlock write lock
rd_thread: acquired read lock
rd_thread: unlock read lock
Test PASSED