ssSetInputPortOverWritable (Writing S-Functions)

Specify whether one of an S-function's input ports can be overwritten by one of its output ports.

C Syntax

void ssSetInputPortOverWritable(SimStruct *S, int_T port, int_T 
isOverwritable)

Ada Syntax

procedure ssSetInputPortOverWritable(S : in SimStruct; port : in 
Integer := 0; isOverwritable : in Boolean);

Arguments

S
SimStruct representing an S-Function block or a Simulink model.

port
Index of the input port whose overwritability is being set.

```
isOverwritable
```

Value specifying whether port is overwritable.

Description

Use in mdlInitializeSizes (after ssSetNumInputPorts) to specify whether port is overwritable by one of the S-function's output ports. Simulink uses this setting as one criterion in determining whether one of the output ports of this S-function can share memory with port. If isOverwritable=1 and the other criteria are satisfied, Simulink allocates a common block of memory for the input port and one of the S-function's output ports, thus reducing simulation memory requirements. The default is isOverwritable=0, which means that port cannot share memory with any of the S-function's output ports.

Note If you set an input port to be overwritable, you must also specify that the input port and at least one of the S-function's output ports are reusable. Use ssSetInputPortOptimOpts and ssSetOutputPortOptimOpts to do this.

Languages

Ada, C

ssSetInputPortOptimOpts ssSetInputPortRequiredContiguous