#include <db_cxx>
int
DbEnv::set_thread_id(void (*thread_id)
(DbEnv *dbenv, pid_t *pid, db_threadid_t *tid));
Declare a function that formats a process ID and thread ID identifier
pair for display into a caller-supplied buffer. The function must
return a reference to the caller-specified buffer. The
DbEnv::set_thread_id_string() method supports the
DbEnv::set_thread_id()
method.
The DbEnv::set_thread_id_string() method configures operations
performed using the specified DbEnv
handle, not all operations performed on the underlying database environment.
The DbEnv::set_thread_id_string() method may be called at any time
during the life of the application.
The DbEnv::set_thread_id_string()
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 thread_id_string parameter is a function which returns a buffer in which is an identifier pair formatted for display. 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 argument is a process ID.
tid
The tid argument is a thread ID.
buf
The buf argument is character array of at least DB_THREADID_STRLEN bytes in length, into which the identifier pair should be formatted.
If no thread_id_string function is specified, the default routine displays the identifier pair as "pid/tid", that is, the process ID represented as an unsigned integer value, a slash ('/') character, then the thread ID represented as an unsigned integer value.
The DbEnv::set_thread_id_string()
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: