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Use QThread::idealThreadCount instead. This requires that we use QVarLengthArray, as MSVC doesn't allow us to allocate arrays with a non-constexpr size on the stack. By using as many threads as the system has cores, we are more likely to detect race conditions reliably. On systems with fewer cores (in particular on qemu platforms like QNX, where this test has been failing a lot), we'll less likely end up with false negatives due to timeouts. Change-Id: Ie8631aef544ca7b53c06a0729d05459016745486 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> (cherry picked from commit 0dadb951b5249d13e78b009759dab6a6ec9dc537) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>