/* BEGIN_ICS_COPYRIGHT3 ****************************************

Copyright (c) 2015, Intel Corporation

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** END_ICS_COPYRIGHT3   ****************************************/

/* [ICS VERSION STRING: unknown] */

#ifndef _IBA_PUBLIC_IREQ_MGR_H_

#define _IBA_PUBLIC_IREQ_MGR_H_

#include "iba/public/datatypes.h"

#include "iba/public/igrowpool.h"

#include "iba/public/ilist.h"

#ifdef __cplusplus

extern "C" {

#endif

/****************************************************************************

 * Generic request callback type, used to queue requests.

 *

 ****************************************************************************/

typedef void 

(*REQ_CALLBACK)( void );

/****************************************************************************

 * This structure is used to manage queuing requests for objects.

 *

 ****************************************************************************/

typedef struct _REQUEST_OBJECT

{

	uint32			Count;			/* Number of items requested. */

	boolean			PartialOk;		/* Is it okay to return some of the items. */

	REQ_CALLBACK	pfnCallback;	/* Notification routine when completed. */

	void			*Context1;		/* Callback context information. */

	void			*Context2;		/* Callback context information. */

} REQUEST_OBJECT;

/****************************************************************************

 * The REQ_MGR_GET_TYPE enumarated type is used to specify the type of 

 * request being performed when calling ReqMgrGet().

 *

 ****************************************************************************/

typedef enum _REQ_MGR_TYPE

{

	ReqGetSync,

	ReqGetAsync,

	ReqGetAsyncPartialOk

} REQ_MGR_TYPE;

/****************************************************************************

 * GET_AVAILABLE_COUNT

 *

 * Description:

 *	Function type declaration for the object count callback function invoked by

 *	the request manager to retrieve the number of objects available.

 *

 * Inputs:

 *	Context - User specified context.

 *

 * Outputs:

 *	None.

 *

 * Returns:

 *	Number of available objects.

 *

 ****************************************************************************/

typedef uint32 (*REQMGR_GET_COUNT_FUNC)(

	IN void *Context );

/****************************************************************************

 * REQ_MGR object.

 *

 ****************************************************************************/

typedef struct _REQ_MGR

{

	/* Pointer to the count callback function. */

	REQMGR_GET_COUNT_FUNC	m_pfnGetCount;		/* DO NOT USE!! */

	/* Context to pass as single parameter to count callback. */

	void					*m_GetContext;		/* DO NOT USE!! */

	/* Offset into each object where the chain pointers are located. */

	uint32					m_NextPtrOffset;	/* DO NOT USE!! */

	uint32					m_PrevPtrOffset;	/* DO NOT USE!! */

	/* Pending requests for elements. */

	QUEUE					m_RequestQueue;		/* DO NOT USE!! */

	/* Requests are dynamically allocated and added to the stack. */

	GROW_POOL				m_RequestPool;		/* DO NOT USE!! */

	boolean					m_Initialized;		/* DO NOT USE!! */

} REQ_MGR;

/****************************************************************************

 * ReqMgrInitState

 * 

 * Description:

 *	This function performs basic request manager initialization.  This 

 *	function cannot fail.

 * 

 * Inputs:

 *	pReqMgr - Pointer to a request manager structure.

 * 

 * Outputs:

 *	None.

 * 

 * Returns:

 *	None.

 * 

 ****************************************************************************/

void

ReqMgrInitState(

	IN REQ_MGR* const pReqMgr );

/****************************************************************************

 * ReqMgrInit

 * 

 * Description:

 *	Initializes the request manager for use.

 * 

 * Inputs:

 *	pReqMgr			- Pointer to a request manager.

 *	pfnGetCount		- Pointer to a callback function invoked to 

 *					get the number of available objects.

 *	GetContext		- Context to pass into the pfnGetCount function.

 *

 * Outputs:

 *	None.

 * 

 * Returns:

 *	FSUCCESS				- the request manager was successfully initialized.

 *	FINSUFFICIENT_MEMORY	- there was not enough memory to initialize the

 *							request manager.

 * 

 ****************************************************************************/

FSTATUS

ReqMgrInit(

	IN REQ_MGR* const pReqMgr,

	IN REQMGR_GET_COUNT_FUNC pfnGetCount,

	IN void* const GetContext );

/****************************************************************************

 * ReqMgrDestroy

 * 

 * Description:

 *	Destroys a request manager.

 * 

 * Inputs:

 *	pReqMgr				- Pointer to a request manager.

 *

 * Outputs:

 *	None.

 * 

 * Returns:

 *	None.

 * 

 ****************************************************************************/

void

ReqMgrDestroy(

	IN REQ_MGR* const pReqMgr );

/****************************************************************************

 * ReqMgrGet

 * 

 * Description:

 *	Retrieves a number of objects, either synchronously or asynchronously.

 * 

 * Inputs:

 *	pReqMgr		- Pointer to a request manager.

 *	pCount		- Contains the number of objects to retrieve.

 *	ReqType		- Type of get operation.  Can be ReqGetSync, ReqGetAsync, or

 *				ReqGetAsyncPartialOk.

 *	pfnCallback	- Pointer to a callback function to store for the request.

 *	Context1	- First of two contexts. 

 *	Context2	- Second of two contexts.

 *

 * Outputs:

 *	pCount		- Contains the number of objects available.

 * 

 * Returns:

 *	FSUCCESS	- The request callback has been invoked with elements to 

 *				satisfy the request.  If the request allowed partial 

 *				completions, all elements are guaranteed to have been returned.

 *	FPENDING	- The request could not complete in it's entirety.  If the 

 *				request allowed partial completion, some elements may have been

 *				already returned.

 *	FINSUFFICIENT_RESOURCES	- There were not enough objects for the request to 

 *							succeed.

 *	FINSUFFICIENT_MEMORY	- There was not enough memory to process the 

 *							request (including queuing the request).

 * 

 ****************************************************************************/

FSTATUS

ReqMgrGet(

	IN REQ_MGR* const pReqMgr,

	IN OUT uint32* const pCount,

	IN const REQ_MGR_TYPE ReqType,

	IN REQ_CALLBACK pfnCallback,

	IN void* const Context1,

	IN void* const Context2 );

/****************************************************************************

 * ReqMgrResume

 * 

 * Description:

 *	Continues (and completes if possible) a pending request for objects, 

 *	if any.

 * 

 * Inputs:

 *	pReqMgr		- Pointer to a request manager.

 *

 * Outputs:

 *	pCount		- Number of objects available for a resuming request.

 *	pContext1	- Contains the Context1 value for the resuming request,

 *				as provided in the ReqMgrGet function.

 *	pContext2	- Contains the Context2 value for the resuming request,

 *				as provided in the ReqMgrGet function.

 * 

 * Returns:

 *	FSUCCESS				- A request was completed.

 *	FNOT_DONE				- There were no pending requests.

 *	FINSUFFICIENT_RESOURCES	- There were not enough resources to complete a

 *							pending request.

 *	FPENDING				- A request was continued, but not completed.

 *

 * Remarks:

 *	At most one requset is resumed.

 * 

 ****************************************************************************/

FSTATUS 

ReqMgrResume(

	IN REQ_MGR* const pReqMgr,

	OUT uint32* const pCount,

	OUT REQ_CALLBACK* const ppfnCallback,

	OUT void** const pContext1,

	OUT void** const pContext2 );

#ifdef __cplusplus

}

#endif

#endif	/* _IBA_PUBLIC_IREQ_MGR_H_ */