/* BEGIN_ICS_COPYRIGHT5 ****************************************

Copyright (c) 2015, Intel Corporation

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      this list of conditions and the following disclaimer.
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** END_ICS_COPYRIGHT5   ****************************************/


#include "datatypes.h"
#include "ievent.h"
#include "idebug.h"
//-----------------------------------------------------------
// Internal functions needed for events
//-----------------------------------------------------------


//-----------------------------------------------------------
// Declare that we intended to create an event
//-----------------------------------------------------------
void 
EventInitState (IN EVENT *pEvent)
{
   	pEvent->ev_state = Constructed;
}

//-----------------------------------------------------------
// Initialize an event 
//-----------------------------------------------------------
boolean
EventInit( IN EVENT *pEvent )
{
	pthread_cond_init(&pEvent->ev_condvar,NULL);
  	pthread_mutex_init( &pEvent->ev_mutex, NULL );
  	pEvent->ev_signaled = FALSE;
  	pEvent->ev_state = Started;	
  	return TRUE;
}

//-----------------------------------------------------------
// Destroy an event
//-----------------------------------------------------------
void
EventDestroy( IN EVENT *pEvent )
{
  	// Destroy only if the event was constructed 
  	if (pEvent->ev_state == Started)
  	{
   		pthread_cond_destroy( &pEvent->ev_condvar );
    	pthread_mutex_destroy( &pEvent->ev_mutex );
		pEvent->ev_signaled = FALSE;
		pEvent->ev_state = Destroyed;
  	}
}

//-----------------------------------------------------------
// Trigger or Signal an event
//-----------------------------------------------------------
void
EventTrigger( IN EVENT *pEvent )
{

	// Make sure that the event was Started
	ASSERT (pEvent->ev_state == Started);
	
 	pthread_mutex_lock( &pEvent->ev_mutex );
	
  	pEvent->ev_signaled = TRUE;
	pthread_cond_signal(&pEvent->ev_condvar );	

  	pthread_mutex_unlock( &pEvent->ev_mutex );
}

//-----------------------------------------------------------
// Clear an event, as though it was never triggered
//-----------------------------------------------------------
void
EventClear( IN EVENT *pEvent )
{
	
  	// Make sure that the event was Started 
  	ASSERT (pEvent->ev_state == Started);

  	pthread_mutex_lock( &pEvent->ev_mutex );

	pEvent->ev_signaled = FALSE;

  	pthread_mutex_unlock( &pEvent->ev_mutex );
}


//-----------------------------------------------------------
// Wait for an event - this event is NOT interruptible
//-----------------------------------------------------------
FSTATUS 
EventWaitOn( IN EVENT *pEvent, IN int32 wait_micro)
{
  	// Make sure that the event was started 
  	ASSERT (pEvent->ev_state == Started);

	//
	// Don't wait if the it has been signaled already!
	//
  	pthread_mutex_lock( &pEvent->ev_mutex );
    if (pEvent->ev_signaled == TRUE)
    {
		// autoclear
		pEvent->ev_signaled = FALSE;

		pthread_mutex_unlock( &pEvent->ev_mutex);
        return FSUCCESS;
    }

  	if (wait_micro == EVENT_NO_TIMEOUT)
	{
		wait_micro = 0;
		// Wait for condition variable ev_condvar to be signaled or broadcast.
		// Also need to implement interruptible/Non interruptible waits!!
		pthread_cond_wait(&pEvent->ev_condvar,&pEvent->ev_mutex);
	
		pEvent->ev_signaled = FALSE;
  		pthread_mutex_unlock( &pEvent->ev_mutex );
		return FSUCCESS;		
  	}
	else
	{
		FSTATUS status = FERROR;
		int retval;

		// Get the current time
		if (gettimeofday(&pEvent->ev_curtime, NULL) == 0)
		{
			(pEvent->ev_timeout).tv_sec = (pEvent->ev_curtime).tv_sec + (wait_micro/1000000);
			(pEvent->ev_timeout).tv_nsec = ((pEvent->ev_curtime).tv_usec + (wait_micro % 1000000)) * 1000;
			// handle carry from nsec to sec
			if ((pEvent->ev_timeout).tv_nsec > 1000000000) {
				(pEvent->ev_timeout).tv_sec++;
				(pEvent->ev_timeout).tv_nsec -= 1000000000;
			}
		
			retval = pthread_cond_timedwait(&pEvent->ev_condvar, &pEvent->ev_mutex, &pEvent->ev_timeout);
			if (retval == ETIMEDOUT)
			{
				status = FTIMEOUT;
			}
			else
			{
				// We got signalled
				status = FSUCCESS;
			}
		}
		pEvent->ev_signaled = FALSE;
  		pthread_mutex_unlock( &pEvent->ev_mutex );
		return status;		
	}
}

//-----------------------------------------------------------
// Wait for an event - this event is interruptible
//-----------------------------------------------------------
FSTATUS 
EventWaitOnInterruptible( IN EVENT *pEvent, IN int32 wait_micro)
{
	return EventWaitOn(pEvent, wait_micro);
}
