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0c54cbd3f8
Sanity checks to detect concurrency bugs were assuming a threading model where each client state would always be processed within single thread of execution. This however may be too strong assumption if the application uses some kind of thread pooling. This patch relaxes those assumptions by removing current_thread_id_ from client_state and relaxing assertions against owning_thread_id_. This patch also adds a new method wait_rollback_complete_and_acquire_ownership() into client_state. This method is idempotent and can be used to gain control to client_state before before_command() is called. The method will wait until possible background rollback process is over and marks the state to s_exec to protect the state against new background rollbacks. Other fixes/improvements: - High priority globals state is restored after discarding streaming. - Allowed server_state transition donor -> synced. - Client state method store_globals() was renamed to acquire_ownership() to better describe the intent. Method store_globals() was left for backwards compatibility and marked deprecated.