void YOS_InitOs(void *taskMemory, void *taskTopMemory);
	Initialize OS
	taskMemory: start of memory reserved to task
	taskTopMemory: end of memory rserved to task

void YOS_DisableIrq(void);
	Disable Irqs

void YOS_EnableIrq(void);
	Enable Irqs

void YOS_Lock(void);
	Disable preemption

void YOS_Unlock(void);  
	Enable preemption

void YOS_Start(void);  
	Start operative system

YOS_Task_t *YOS_AddTask(YOS_Routine_t task, int taskSize);
	Add task
	task: pointer to function
	taskSize: stackSize
	NOTE: function allocate also the tcb

void YOS_MutexInit(YOS_Mutex_t *mutex);
	Initialize a mutex
	mutex: pointer to a mutex object
	
bool YOS_MutexTryAcquire(YOS_Mutex_t *mutex);
	Try to acquire mutex. Return immediately
	mutex: pointer to a mutex object
	return: true if mutex is acquired, false otherwise

void YOS_MutexAcquire(YOS_Mutex_t *mutex);
	Acquire a mutex 
	mutex: pointer to a mutex object

void YOS_MutexRelease(YOS_Mutex_t *mutex);
	Release a mutex 
	mutex: pointer to a mutex object

void YOS_EventInit(YOS_Event_t *event);
	Init a event object 

DWORD YOS_EventWait(YOS_Event_t *event);
	Wait for event object 
	event: pointer to an event object
	return: event flag mask 

void YOS_EventSignal(YOS_Event_t *event, int flag);
	Signal and event
	event: pointer to an event object 
	flag: number flag to set

void YOS_Yield(void);
	Yield control to next task