[RESOLVED] Critical section

[juanpast]

Hi again.

Now I'm trying to write a example of critical sections but it's not work. why?

NOTE: main function only call Inicio function.

#define NTHREADS 500
#define MAXCADENA 10
#define MAXTIMESLEEP 50

CRITICAL_SECTION CriticalSection_Cadena;

void Inicio (void);
char sCadena[MAXCADENA];
int nNumero;

int Aleatorio(int nMin, int nMax) {
	UINT nNumero;	
	rand_s(&nNumero);
	int nRes = (UINT)((double)nNumero / (double) UINT_MAX * (double)nMax) + nMin;	
	return nRes;
}

void WINAPI fx(void) {	
	EnterCriticalSection(&CriticalSection_Cadena);

		char c = Aleatorio(48, 90); // del 48 al 90 las letras
		int nPos = Aleatorio(0, (MAXCADENA-1));	
		sCadena[nPos] = c;	
		nNumero = c;
	
	LeaveCriticalSection(&CriticalSection_Cadena);
}

void Inicio (void) {

	srand(time(NULL));	
	memset(sCadena, '-', sizeof(char) * MAXCADENA);

	void (WINAPI *vfx[NTHREADS])(); // matriz de NTHREADS de punteros a funciones	
	// Creamos las funciones
	for(int i=0;i<NTHREADS;i++) {
		vfx[i] = fx;
	}

	InitializeCriticalSection(&CriticalSection_Cadena);

	HANDLE vhThread[NTHREADS];
	// Abro los hilos
	for(int i=0;i<NTHREADS;i++) {
		vhThread[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)vfx[i], NULL, 0, 0);		
	}

	WaitForMultipleObjects(NTHREADS, vhThread,  TRUE, INFINITE);
	sCadena[MAXCADENA-1] = '\0';	

	for(int i=0;i<NTHREADS;i++) {
		CloseHandle(vhThread[i]);
	}

	DeleteCriticalSection(&CriticalSection_Cadena); 

	MessageBox(NULL, sCadena, "Cadena", MB_OK);	
}