ssSetInputPortOverWritable

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

Syntax

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

Arguments

S: SimStruct that represents an S-Function block.
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. The Simulink^® engine 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, the engine 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

C, C++

Examples

See the S-function sfun_multirate.c used in sfcndemo_sfun_multirate and the S-function sdotproduct.c used in sfcndemo_sdotproduct.

Version History

Introduced before R2006a