execution: PASS
main: attempt read lock
main: acquired read lock
main: create wr_thread, with priority: 0
wr_thread: attempt write lock
main: create rd_thread, with priority: 1
rd_thread: attempt read lock
rd_thread: acquired read lock
rd_thread: unlock read lock
main: unlock read lock
wr_thread: acquired write lock
wr_thread: unlock write lock
Test PASSED