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#ifndef NTDB_TEST_EXTERNAL_AGENT_H
#define NTDB_TEST_EXTERNAL_AGENT_H
/* For locking tests, we need a different process to try things at
* various times. */
enum operation {
OPEN,
OPEN_WITH_HOOK,
FETCH,
STORE,
TRANSACTION_START,
TRANSACTION_COMMIT,
NEEDS_RECOVERY,
CHECK,
SEND_SIGNAL,
CLOSE,
};
/* Do this before doing any ntdb stuff. Return handle, or -1. */
struct agent *prepare_external_agent(void);
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 == ntdb name for OPEN/OPEN_WITH_CLEAR_IF_FIRST,
* <key>=<data> for FETCH/STORE.
*/
enum agent_return external_agent_operation(struct agent *handle,
enum operation op,
const char *name);
/* Hook into free() on ntdb_data in external agent. */
extern void (*external_agent_free)(void *);
/* Mapping enum -> string. */
const char *agent_return_name(enum agent_return ret);
const char *operation_name(enum operation op);
void free_external_agent(struct agent *agent);
/* Internal use: */
struct ntdb_context;
enum agent_return external_agent_needs_rec(struct ntdb_context *ntdb);
#endif /* NTDB_TEST_EXTERNAL_AGENT_H */
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