MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario descargar pdf (Pagina 99)

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101

Advanced Topics

2-39

creates persistent objects should register a function, using mexAtExit, which

will dispose of the objects. (You can use a

mexAtExit function to dispose of other

resources as well; for example, you can use

mexAtExit to close an open file.)

For example, here is a simple MEX-file that creates a persistent array and

properly disposes of it.

#include "mex.h"

static int initialized = 0;

static mxArray *persistent_array_ptr = NULL;

void cleanup(void) {

mexPrintf("MEX-file is terminating, destroying array\n");

mxDestroyArray(persistent_array_ptr);

}

void mexFunction(int nlhs,

mxArray *plhs[],

int nrhs,

const mxArray *prhs[])

{

if(!initialized) {

mexPrintf("MEX-file initializing, creating array\n");

/* Create persistent array and register its cleanup. */

persistent_array_ptr = mxCreateDoubleMatrix(1, 1, mxREAL);

mexMakeArrayPersistent(persistent_array_ptr);

mexAtExit(cleanup);

initialized = 1;

/* Set the data of the array to some interesting value. */

*mxGetPr(persistent_array_ptr) = 1.0;

} else {

mexPrintf("MEX-file executing; value of first array

element is %g\n",

*mxGetPr(persistent_array_ptr));

}

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