#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, both in the Berkeley DB Programmer's Reference Guide.
    
         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:
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 DbEnv::set_thread_id() method.
tid
The tid parameter is a thread ID returned by the function specified to the DbEnv::set_thread_id() method.
flags
The flags parameter must be set to 0 or the following value:
                         The DbEnv::set_isalive() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors: