New (Daemon constructor): Difference between revisions
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<tr><th><var>Transactional</var></th> | <tr><th><var>Transactional</var></th> | ||
<td>An optional, but <var>[[Methods#Named parameters|NameRequired]]</var> parameter whose value is a <var>[[Boolean enumeration]]</var>.<ul><li>If set to <code>True</code>, the daemon is [[Daemon_class#Transactional_daemons|transactional]], with the master and daemon threads share a single updating transaction.<li>If set to <code>False</code>, the default, the daemon is non-transactional.</ul> | <td>An optional, but <var>[[Methods#Named parameters|NameRequired]]</var> parameter whose value is a <var>[[Boolean enumeration]]</var>.<ul><li>If set to <code>True</code>, the daemon is [[Daemon_class#Transactional_daemons|transactional]], with the master and daemon threads share a single updating transaction.<li>If set to <code>False</code>, the default, the daemon is non-transactional.</ul> | ||
This parameter is new as of <var class="product">[[Sirius Mods| | This parameter is new as of <var class="product">[[Sirius Mods|Sirius Mods]]</var> Version 6.8.</td></tr> | ||
</table> | </table> | ||
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This subroutine can throw the following exceptions:<dl> | This subroutine can throw the following exceptions:<dl> | ||
<dt><var>[[NoFreeDaemons_class|NoFreeDaemons]]</var> | <dt><var>[[NoFreeDaemons_class|NoFreeDaemons]]</var> | ||
<dd>If there are no daemon threads available to service the object, a <var>NoFreeDaemons</var> exception is thrown. This exception will only be thrown in <var class="product">[[Sirius Mods| | <dd>If there are no daemon threads available to service the object, a <var>NoFreeDaemons</var> exception is thrown. This exception will only be thrown in <var class="product">[[Sirius Mods|Sirius Mods]]</var> Version 7.2 and later.</dl> | ||
==Usage notes== | ==Usage notes== | ||
Revision as of 17:46, 4 May 2011
Create a new Daemon (Daemon class)
New creates a new Daemon object instance. It has two, optional, arguments.
Syntax
%daemon = [%(Daemon):]New[( [CopyGlobals= boolean], [Transactional= boolean], - [OpenAll= boolean])] Throws MaxDaemExceeded, NoFreeDaemons, DaemonLost
Syntax terms
| %daemon | A previously defined Daemon object. |
|---|---|
| CopyGlobals | An optional, but NameRequired parameter whose value is a Boolean enumeration.
The default is
If set to True:
|
| Transactional | An optional, but NameRequired parameter whose value is a Boolean enumeration.
|
Exceptions
This subroutine can throw the following exceptions:
- NoFreeDaemons
- If there are no daemon threads available to service the object, a NoFreeDaemons exception is thrown. This exception will only be thrown in Sirius Mods Version 7.2 and later.
Usage notes
- New not only creates a Daemon object in the user tables, but it also finds a free sdaemon thread and dedicates it to the issuing user. If no sdaemon threads are available, the request is cancelled.
- The number of daemons allowed per master thread is limited by the MAXDAEM system parameter, whose default value is 1.
- If you specify
CopyGlobals=True, and if there is insufficient server space (say, if daemons start out with very big tables, except for GTBL, and the master has a very big GTBL), the daemon fails during initialization.