#include <db_cxx.h>

int
DbEnv::set_isalive(int (*is_alive)(DbEnv *dbenv, pid_t pid, db_threadid_t tid, u_int32_t flags));

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

The DbEnv::set_isalive method configures operations performed using the specified DbEnv handle, not all operations performed on the underlying database environment.

The DbEnv::set_isalive method may be called at any time during the life of the application.

The DbEnv::set_isalive method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

• 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:

• The dbenv parameter is the enclosing database environment handle, allowing application access to the application-private fields of that object.

• The pid parameter is a process ID returned by the function specified to the DbEnv::set_thread_id method.

• The tid parameter is a thread ID returned by the function specified to the DbEnv::set_thread_id method.

• 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.
  
  

The DbEnv::set_isalive method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

• An invalid flag value or parameter was specified.