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DB_ENV-&gt;set_thread_id_string
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#include &lt;db.h&gt;

int
DB_ENV-&gt;set_thread_id_string(DB_ENV *dbenv,
 char *(*thread_id_string)(DB_ENV *dbenv,
 pid_t pid, db_threadid_t tid, char *buf));
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Description: DB_ENV-&gt;set_thread_id_string
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
DB_ENV-&gt;set_thread_id_string method supports the
<a href="../../db4-devel-4.7.25/api_c/env_set_thread_id.html">DB_ENV-&gt;set_thread_id</a> method.
The DB_ENV-&gt;set_thread_id_string method configures operations performed using the specified
<a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a> handle, not all operations performed on the underlying
database environment.
The DB_ENV-&gt;set_thread_id_string method may be called at any time during the life of the
application.
The DB_ENV-&gt;set_thread_id_string method
returns a non-zero error value on failure
and 0 on success.

Parameters 
 thread_id_string<ul compact><li>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:</ul>
 
dbenv<ul compact><li>The dbenv parameter is the enclosing database environment
handle, allowing application access to the application-private fields
of that object.</ul>
pid<ul compact><li>The pid argument is a process ID.</ul>
tid<ul compact><li>The tid argument is a thread ID.</ul>
buf<ul compact><li><a name="2"></a>
The buf argument is character array of at least
DB_THREADID_STRLEN bytes in length, into which the identifier
pair should be formatted.</ul>
 
 
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.
 Errors
The DB_ENV-&gt;set_thread_id_string method
may fail and return one of the following non-zero errors:
 
EINVAL<ul compact><li>An
invalid flag value or parameter was specified.</ul>
 
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 Class
<a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a>
 See Also
<a href="../../db4-devel-4.7.25/api_c/env_list.html">Database Environments and Related Methods</a>
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