DB_ENV->set_isalive |

`

    #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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