* oacc-init.c (acc_device_lock): Add explanatory comment. (resolve_device): Add comment about locking requirement. (acc_init_1, acc_shutdown_1): Likewise. Add locking around gomp_init_device and gomp_fini_device calls. (acc_get_num_devices, acc_set_device_type, acc_get_device_type) (acc_get_device_num, acc_set_device_num): Add locking around resolve_device and gomp_init_device calls. From-SVN: r222862