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<title>Berkeley DB: DB_ENV-&gt;set_isalive</title>
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DB_ENV-&gt;set_isalive
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#include &lt;db.h&gt;

int
DB_ENV-&gt;set_isalive(DB_ENV *dbenv,
 int (*is_alive)(DB_ENV *dbenv, pid_t pid, db_threadid_t tid, u_int32_t flags));
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Description: DB_ENV-&gt;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-&gt;set_isalive method
supports the <a href="../../db4-devel-4.7.25/api_c/env_failchk.html">DB_ENV-&gt;failchk</a> method. For more information, see
<a href="../../db4-devel-4.7.25/ref/cam/app.html">Architecting Data Store and Concurrent
Data Store applications</a>, and <a href="../../db4-devel-4.7.25/ref/transapp/app.html">Architecting Transactional Data Store applications</a>.
The DB_ENV-&gt;set_isalive 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_isalive method may be called at any time during the life of the
application.
The DB_ENV-&gt;set_isalive method
returns a non-zero error value on failure
and 0 on success.

Parameters 
 is_alive<ul compact><li>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:</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 parameter is a process ID returned by the function
specified to the <a href="../../db4-devel-4.7.25/api_c/env_set_thread_id.html">DB_ENV-&gt;set_thread_id</a> method.</ul>
tid<ul compact><li>The tid parameter is a thread ID returned by the function
specified to the <a href="../../db4-devel-4.7.25/api_c/env_set_thread_id.html">DB_ENV-&gt;set_thread_id</a> method.</ul>
flags<ul compact><li>The flags parameter must be set to 0 or
the following value:
 
<a name="DB_MUTEX_PROCESS_ONLY">DB_MUTEX_PROCESS_ONLY</a><ul compact><li>Return only if the process is alive, the thread ID should be ignored.</ul>
 </ul>
 
 
 Errors
The DB_ENV-&gt;set_isalive 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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