#ifndef TDB_TEST_EXTERNAL_AGENT_H

#define TDB_TEST_EXTERNAL_AGENT_H

/* For locking tests, we need a different process to try things at

 * various times. */

enum operation {

	OPEN,

	OPEN_WITH_CLEAR_IF_FIRST,

	TRANSACTION_START,

	FETCH,

	STORE,

	TRANSACTION_COMMIT,

	CHECK,

	NEEDS_RECOVERY,

	CLOSE,

	PING,

	UNMAP,

};

/* Do this before doing any tdb stuff.  Return handle, or -1. */

struct agent *prepare_external_agent(void);

void shutdown_agent(struct agent *agent);

enum agent_return {

	SUCCESS,

	WOULD_HAVE_BLOCKED,

	AGENT_DIED,

	FAILED, /* For fetch, or NEEDS_RECOVERY */

	OTHER_FAILURE,

};

/* Ask the external agent to try to do an operation.

 * name == tdb name for OPEN/OPEN_WITH_CLEAR_IF_FIRST,

 * record name for FETCH/STORE (store stores name as data too)

 */

enum agent_return external_agent_operation(struct agent *handle,

					   enum operation op,

					   const char *name);

/* Mapping enum -> string. */

const char *agent_return_name(enum agent_return ret);

const char *operation_name(enum operation op);

#endif /* TDB_TEST_EXTERNAL_AGENT_H */