/* BEGIN_ICS_COPYRIGHT6 ****************************************

Copyright (c) 2015, Intel Corporation

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      this list of conditions and the following disclaimer.

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** END_ICS_COPYRIGHT6   ****************************************/

#include "datatypes.h"

#include "ieventthread.h"

#include "imemory.h"

//

// EventThread Implementation

//

static void 

EventThreadRoutine(

	IN void *Context )

{

	EVENT_THREAD *pEventThread = (EVENT_THREAD*)Context;

	ThreadSetPriority(pEventThread->m_Priority);

	// Continue looping until signalled to end.

	while( TRUE )

	{

		// Wait for the specified event to occur.

		// IbAccess created kernel threads have signals blocked

		// use interruptible wait so we don't contribute to loadavg

		EventWaitOnInterruptible( &pEventThread->m_Event, EVENT_NO_TIMEOUT );

		// See if we've been signalled to end execution.

		if( pEventThread->m_Exit )

		{

			break;

		}

		// The event has been signalled.  Invoke the callback.

		(*pEventThread->m_Callback)( pEventThread->m_Context );

	}

}

void 

EventThreadInitState( 

	IN EVENT_THREAD *pEventThread )

{

	MemoryClear( pEventThread, sizeof( EVENT_THREAD ) );

	EventInitState( &pEventThread->m_Event );

	ThreadInitState( &pEventThread->m_Thread );

}

//

// Starts the event thread

//

boolean 

EventThreadCreate( 

	IN EVENT_THREAD *pEventThread, 

    IN char* Name,

	IN THREAD_PRI Priority,

	IN THREAD_CALLBACK Callback,

	IN void *Context )

{

	ASSERT( Callback );

	EventThreadInitState( pEventThread );

	// Initialize the event that the thread waits on.

	if( !EventInit( &pEventThread->m_Event ) )

	{

		return FALSE;

	}

	pEventThread->m_Priority = Priority;

	pEventThread->m_Callback = Callback;

	pEventThread->m_Context = Context;

	// Start the thread.

	if( !ThreadCreate( &pEventThread->m_Thread, Name, EventThreadRoutine, pEventThread ) )

	{

		EventDestroy(&pEventThread->m_Event);

		return FALSE;

	}

	pEventThread->m_Initialized = TRUE;

	return TRUE;

}

// Destroys the thread, hence stopping it

void 

EventThreadStop( 

	IN EVENT_THREAD *pEventThread )

{

	if( !pEventThread->m_Initialized )

		return;

	// Indicate to thread that it needs to exit.

	pEventThread->m_Exit = TRUE;

	EventTrigger( &pEventThread->m_Event );

	// Stop the thread.  Note: it is safe to call ThreadDestroy multiple times

	ThreadDestroy( &pEventThread->m_Thread );

}

//

// Destroys the thread and event

//

void 

EventThreadDestroy( 

	IN EVENT_THREAD *pEventThread )

{

	if( !pEventThread->m_Initialized )

		return;

	EventThreadStop(pEventThread);

	EventDestroy( &pEventThread->m_Event );

	pEventThread->m_Initialized = FALSE;

}