Berkeley DB: DB_ENV->set_isalive
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### DB_ENV->set_isalive |

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    #include <db.h>

    int
    DB_ENV->set_isalive(DB_ENV *dbenv,
        int (*is_alive)(DB_ENV *dbenv, pid_t pid, db_threadid_t tid, u_int32_t flags));

### Description: DB_ENV->set_isalive

Declare a function that returns if a thread of control (either a true thread or a process) is still running. The DB_ENV->set_isalive method supports the DB_ENV->failchk method. For more information, see Architecting Data Store and Concurrent Data Store applications, and Architecting Transactional Data Store applications.

The DB_ENV->set_isalive method configures operations performed using the specified DB_ENV handle, not all operations performed on the underlying database environment.

The DB_ENV->set_isalive method may be called at any time during the life of the application.

The DB_ENV->set_isalive method returns a non-zero error value on failure and 0 on success.

### Parameters

is_alive
  The is_alive parameter is a function which returns non-zero if the thread of control, identified by the pid and tid arguments, is still running. The function takes four arguments:
  dbenv
    The dbenv parameter is the enclosing database environment handle, allowing application access to the application-private fields of that object.
  pid
    The pid parameter is a process ID returned by the function specified to the DB_ENV->set_thread_id method.
  tid
    The tid parameter is a thread ID returned by the function specified to the DB_ENV->set_thread_id method.
  flags
    The flags parameter must be set to 0 or the following value:
    DB_MUTEX_PROCESS_ONLY
      Return only if the process is alive, the thread ID should be ignored.

### Errors

The DB_ENV->set_isalive method may fail and return one of the following non-zero errors:

EINVAL
  An invalid flag value or parameter was specified.

### Class

DB_ENV

### See Also

Database Environments and Related Methods`

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