auto res = MutexAcquisitionImplPtr(new kernel::activity::MutexAcquisitionImpl(issuer, this), true);
if (owner_ == nullptr) { // Lock is free, take it
owner_ = issuer;
auto res = MutexAcquisitionImplPtr(new kernel::activity::MutexAcquisitionImpl(issuer, this), true);
if (owner_ == nullptr) { // Lock is free, take it
owner_ = issuer;