New (Daemon constructor): Difference between revisions

Revision as of 20:24, 30 November 2011

Create a new Daemon (Daemon class)

New creates a new Daemon object instance. It has two, optional, arguments.

%daemon = [%(Daemon):]New[( [CopyGlobals= boolean], [Transactional= boolean], - [OpenAll= boolean])] Throws MaxDaemExceeded, NoFreeDaemons, DaemonLost

%daemon	A previously defined `Daemon` object.
`[%(Daemon):]`	The optional class name in parentheses denotes a `Constructor`. See "Usage notes", below, for more information about invoking a `Daemon` `Constructor`.
`CopyGlobals`	An optional, but `NameRequired` parameter whose value is a `Boolean enumeration`. The default is `False`: do not copy the existing global variable information from the master thread; use default GTBL-creation settings for the daemon. If set to `True`: The GTBL server table is set to the same size on the daemon as it is on the master thread. The GTBLHASH and GTBLPCT parameters on the daemon thread are set to the same values as on the master thread. Only unstructured globals (globals created by $setg or $getg) and Perm Global Images in the master thread GTBL are copied to the daemon (Global Foundsets/Lists, Global Screens, and any Temp Global items are *not* copied).
`Transactional`	An optional, but `NameRequired` parameter whose value is a `Boolean enumeration`. If set to `True`, the daemon is transactional, with the master and daemon threads share a single updating transaction. If set to `False`, the default, the daemon is non-transactional. This parameter is new as of `Sirius Mods` Version 6.8.

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.

As described in "Using New or other Constructors", New can be invoked with no object, with an explicit class name, or with an object variable in the class, even if that object is Null:
%daemon = new %daemon = %(Daemon):new %daemon = %daemon:new
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.

@@ Line 8: / Line 8: @@
 <tr><th>%daemon</th>
 <td>A previously defined <var>[[Daemon class|Daemon]]</var> object. </td></tr>
-<tr><th><var>[%(Daemon)]</var></th>
+<tr><th><var>[%(Daemon):]</var></th>
 <td>The optional class name in parentheses denotes a <var>[[Notation conventions for methods#Constructors|Constructor]]</var>. See [[#Usage notes|"Usage notes"]], below, for more information about invoking a <var>Daemon</var> <var>Constructor</var>.</td></tr>
 <tr><th><var>CopyGlobals</var></th>

Daemon class	List of Daemon methods	Daemon methods syntax
Notation conventions for methods