3. Basic SRL Programming Models

3.1. Selecting Basic SRL Programming Models

This section describes the following basic SRL programming models:

Synchronous
Asynchronous
Extended Asynchronous

Basic programming models are recommended because you can apply them to almost all applications. Select a basic programming model according to the criteria shown in Table 1. The sections following this table describe these basic programming models.

Table 1. Guidelines for Selecting a Basic Programming Model

Application Requirements

Recommended Basic Programming Model

Threading and Event Handling Considerations

Few devices

Synchronous
(Section 3.2)

Create a separate thread to execute processing for each Dialogic device.

Many devices
Multiple tasks

Asynchronous
(Section 3.3)

Call sr_waitevt( ) to wait for events. Create a single thread to execute processing for all Dialogic devices.

Many devices
Multiple tasks
Needs to wait for events on more than one grouping of devices.

Extended Asynchronous
(Section 3.4)

Call sr_waitevtEx( ) for each grouping of devices, to wait for events on that grouping.

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Application Requirements	Recommended Basic Programming Model	Threading and Event Handling Considerations
Few devices	Synchronous (Section 3.2)	Create a separate thread to execute processing for each Dialogic device.
Many devices Multiple tasks	Asynchronous (Section 3.3)	Call sr_waitevt( ) to wait for events. Create a single thread to execute processing for all Dialogic devices.
Many devices Multiple tasks Needs to wait for events on more than one grouping of devices.	Extended Asynchronous (Section 3.4)	Call sr_waitevtEx( ) for each grouping of devices, to wait for events on that grouping.