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#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 );
}
//-----------------------------------------------------------
// Wakes all waiters intest of just one.
//-----------------------------------------------------------
void
EventBroadcast( 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_broadcast(&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);
}