[RESOLVED] srand

I'am thinking about synchronization and I begin with this code with the purpose to change it latter to insert a semaphore for example but this code not work fine... I think the trouble is with the initialization of srand...

NOTE: main function only call Inicio function.

Code:

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#define NTHREADS 10
#define MAXCADENA 10

void Inicio (void);

char sCadena[MAXCADENA];

int Aleatorio(int nMin, int nMax) {       
        int nRes = nMin + rand() % ((nMax + 1) - nMin);
        return nRes;
}

void WINAPI fx(void) {       
        char c = Aleatorio(48, 90); // del 48 al 90 las letras
        int nPos = Aleatorio(0, (MAXCADENA-1));
        sCadena[nPos] = c;       
}

void Inicio (void) {

        srand(time(NULL));
       
        for(int i=0;i<NTHREADS;i++) {
                HANDLE h = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)fx, NULL, 0, 0);       
                WaitForSingleObject(h, 100);
        }

        sCadena[MAXCADENA-1] = '\0';
       
        MessageBox(NULL, sCadena, "Cadena", MB_OK);
}

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I think rand() is not thread safe. You could try to use rand_s() instead.
Kurt

Thanks!!