Persistent mxArrays
You can exempt an array, or a piece of memory, from the MATLAB® automatic cleanup by calling mexMakeArrayPersistent
or mexMakeMemoryPersistent
. However, if a MEX function creates
persistent objects, then a memory leak could occur if the MEX function is cleared before
the persistent object is properly destroyed. To prevent memory leaks, use the
mexAtExit
function to register a function to free the memory
for objects created using these functions.
The following MEX file code 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. */ *mxGetDoubles(persistent_array_ptr) = 1.0; } else { mexPrintf("MEX file executing; value of first array element is %g\n", *mxGetDoubles(persistent_array_ptr)); } }
See Also
mexMakeArrayPersistent
| mexAtExit