[emdoran]

I'm having trouble using the DEFINE_EXECUTE_ON_LOADING functionality to reserve a certain number of UDM/UDS variables for the UDF library that I am using. I'm using the basic code provided in the example from the documentation (below), however on initial loading I always receive the error stating that I need to allocate additional UDM/UDSs and reload, regardless of how many locations are already present and free. Oddly enough, if I simply reload the case at that point it will work fine, but it never works on the initial loading. It doesn't make sense to use this functionality if I have to load my casefiles twice. If anybody else recognises this problem and has found a solution, please let me know.

< begin code >

/* general FLUENT header files */
#include "udf.h"
#include "mem.h"

static int udsOffset = UDS_UNRESERVED;
#define N_TESTLIB_UDS 2

static int udmOffset = UDM_UNRESERVED;
#define N_TESTLIB_UDM 2

DEFINE_EXECUTE_ON_LOADING(testLoad, libname)
{
/* ---- reserve user-defined memory ----- */
if (udmOffset == UDM_UNRESERVED)
udmOffset = Reserve_User_Memory_Vars(N_TESTLIB_UDM);

if (udmOffset == UDM_UNRESERVED)
Message("\nDefine %d extra UDMs in GUI and reload %s\n",
N_TESTLIB_UDM, libname);
else
{
Message("%d UDMs have been reserved by the current library %s\n",
N_TESTLIB_UDM, libname);

/* set names of user defined memory */
Set_User_Memory_Name(udmOffset, "M1");
Set_User_Memory_Name(udmOffset+1, "M2");
Message("UDM offset for current loaded library = %d\n", udmOffset);
}

/* ---- reserve user-defined scalars ----- */
if (udsOffset == UDS_UNRESERVED)
udsOffset = Reserve_User_Scalar_Vars(N_TESTLIB_UDS);

if (udsOffset == UDS_UNRESERVED)
Message("\nDefine %d extra UDS in GUI and reload %s\n",
N_TESTLIB_UDS, libname);
else
{
Message("%d UDS have been reserved by the current library %s\n",
N_TESTLIB_UDS, libname);

/* set names of user defined memory */
Set_User_Scalar_Name(udsOffset, "Var1");
Set_User_Scalar_Name(udsOffset+1, "Var2");
Message("UDS offset for current loaded library = %d\n", udsOffset);
}
}