Attempt to lock this reader/writer lock for read.
Declared in <bslmt_readerwriterlock.h>
int
tryLockRead();Attempt to lock this reader/writer lock for read. Return 0 on success, and a non-zero value if the lock is currently locked for write or if there are writers waiting for this lock. If successful, unlock must be used to release this lock.
0 on success, and a non-zero value if locked for write or writers are waiting