QReadWriteLock: add a check for writeOnly, too

Results on my machine:

  PASS   : tst_QReadWriteLock::writeOnly(QMutex)
  RESULT : tst_QReadWriteLock::writeOnly():QMutex:
     3,607 msecs per iteration (total: 3,607, iterations: 1)
  PASS   : tst_QReadWriteLock::writeOnly(QReadWriteLock)
  RESULT : tst_QReadWriteLock::writeOnly():QReadWriteLock:
     39,703 msecs per iteration (total: 39,703, iterations: 1)
  PASS   : tst_QReadWriteLock::writeOnly(std::mutex)
  RESULT : tst_QReadWriteLock::writeOnly():std::mutex:
     3,697 msecs per iteration (total: 3,697, iterations: 1)
  PASS   : tst_QReadWriteLock::writeOnly(std::shared_mutex)
  RESULT : tst_QReadWriteLock::writeOnly():std::shared_mutex:
     5,727 msecs per iteration (total: 5,727, iterations: 1)
  PASS   : tst_QReadWriteLock::writeOnly(std::shared_timed_mutex)
  RESULT : tst_QReadWriteLock::writeOnly():std::shared_timed_mutex:
     5,921 msecs per iteration (total: 5,921, iterations: 1)

(the 'nothing' test of course doesn't work with writing, as writing to
the same QString from different threads is UB)

Change-Id: Ia78b54963a51eaf6563ce0d243316a3337056a83
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

0 files changed, 0 insertions, 0 deletions