add: bank[i].control = CreateMutex ();
context: init_cond_bank (){	int i;	bank_mutex = CreateMutex ();	for (i = 0; i < CONDVAR_BANK_SIZE; i++)	{		char str[20];		sprintf (str, "bank sem %d", i);		bank[i].var = CreateSemaphore (0, str); 		bank[i].id = bank[i].used = 0;	}}