liboffloadmic/include/coi/source/COIEvent_source.h

/*
 * Copyright 2010-2016 Intel Corporation.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, version 2.1.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 * Disclaimer: The codes contained in these modules may be specific
 * to the Intel Software Development Platform codenamed Knights Ferry,
 * and the Intel product codenamed Knights Corner, and are not backward
 * compatible with other Intel products. Additionally, Intel will NOT
 * support the codes or instruction set in future products.
 *
 * Intel offers no warranty of any kind regarding the code. This code is
 * licensed on an "AS IS" basis and Intel is not obligated to provide
 * any support, assistance, installation, training, or other services
 * of any kind. Intel is also not obligated to provide any updates,
 * enhancements or extensions. Intel specifically disclaims any warranty
 * of merchantability, non-infringement, fitness for any particular
 * purpose, and any other warranty.
 *
 * Further, Intel disclaims all liability of any kind, including but
 * not limited to liability for infringement of any proprietary rights,
 * relating to the use of the code, even if Intel is notified of the
 * possibility of such liability. Except as expressly stated in an Intel
 * license agreement provided with this code and agreed upon with Intel,
 * no license, express or implied, by estoppel or otherwise, to any
 * intellectual property rights is granted herein.
 */

#ifndef _COIEVENT_SOURCE_H
#define _COIEVENT_SOURCE_H

/** @ingroup COIEvent
 *  @addtogroup COIEventSource
@{
* @file source/COIEvent_source.h
*/
#ifndef DOXYGEN_SHOULD_SKIP_THIS

#include "../common/COITypes_common.h"
#include "../common/COIResult_common.h"

#ifdef __cplusplus
extern "C" {
#endif
#endif // DOXYGEN_SHOULD_SKIP_THIS
///////////////////////////////////////////////////////////////////////////////
///
/// Special case event values which can be passed in to APIs to specify
/// how the API should behave. In COIBuffer APIs passing in NULL for the
/// completion event is the equivalent of passing COI_EVENT_SYNC.
/// Note that passing COI_EVENT_ASYNC can be used when the caller wishes the
/// operation to be performed asynchronously but does not care when the
/// operation completes. This can be useful for operations that by definition
/// must complete in order (DMAs, run functions on a single pipeline). If
/// the caller does care when the operation completes then they should pass
/// in a valid completion event which they can later wait on.
///
#define COI_EVENT_ASYNC ((COIEVENT*)1)
#define COI_EVENT_SYNC  ((COIEVENT*)2)

//////////////////////////////////////////////////////////////////////////////
///
/// This can be used to initialize a COIEVENT to a known invalid state.
/// This is not required to use, but can be useful in some cases
/// if a program is unsure if the event will be initialized by the runtime.
/// Simply set the event to this value: COIEVENT event = COI_EVENT_INITIALIZER;
///
#define COI_EVENT_INITIALIZER   { { 0, -1 } }


///////////////////////////////////////////////////////////////////////////////
///
/// Wait for an arbitrary number of COIEVENTs to be signaled as completed,
/// eg when the run function or asynchronous map call associated with an event
/// has finished execution.
/// If the user sets in_WaitForAll = True and not all of the events are
/// signaled when the timeout period is reached then COI_TIME_OUT_REACHED will
/// be returned.
/// If the user sets in_WaitForAll = False then if at least one event is
/// signaled when the timeout is reached then COI_SUCCESS is returned.
///
/// @param  in_NumEvents
///         [in] The number of events to wait for.
///
/// @param  in_pEvents
///         [in] The array of COIEVENT handles to wait for.
///
/// @param  in_Timeout
///         [in] The time in milliseconds to wait for the event. 0 polls
///         and returns immediately, -1 blocks indefinitely.
///
/// @param  in_WaitForAll
///         [in] Boolean value specifying behavior. If true, wait for all
///         events to be signaled, or for timeout, whichever happens first.
///         If false, return when any event is signaled, or at timeout.
///
/// @param  out_pNumSignaled
///         [out] The number of events that were signaled. If in_NumEvents
///         is 1 or in_WaitForAll = True, this parameter is optional.
///
/// @param  out_pSignaledIndices
///         [out] Pointer to an array of indices into the original event
///         array. Those denoted have been signaled. The user must provide an
///         array that is no smaller than the in_Events array. If in_NumEvents
///         is 1 or in_WaitForAll = True, this parameter is optional.
///
/// @return COI_SUCCESS once an event has been signaled completed.
///
/// @return COI_TIME_OUT_REACHED if the events are still in use when the
///         timeout is reached or timeout is zero (a poll).
///
/// @return COI_OUT_OF_RANGE if a negative value other than -1 is passed in to
///         the in_Timeout parameter.
///
/// @return COI_OUT_OF_RANGE if in_NumEvents is 0.
///
/// @return COI_INVALID_POINTER if in_pEvents is NULL.
///
/// @return COI_ARGUMENT_MISMATCH if in_NumEvents > 1 and if in_WaitForAll
///         is not true and out_pSignaled or out_pSignaledIndicies are NULL.
///
/// @return COI_ARGUMENT_MISMATCH if out_pNumSignaled is not NULL
///         and out_pSignaledIndices is NULL (or vice versa).
///
/// @return COI_EVENT_CANCELED if while waiting on a user event, it gets
///         unregistered this returns COI_EVENT_CANCELED
///
/// @return COI_PROCESS_DIED if the remote process died. See COIProcessDestroy
///         for more details.
///
/// @return COI_<REAL ERROR> if only a single event is passed in, and that event
///         failed, COI will attempt to return the real error code that caused
///         the original operation to fail, otherwise COI_PROCESS_DIED is reported.
///
COIACCESSAPI
COIRESULT
COIEventWait(
    uint16_t        in_NumEvents,
    const   COIEVENT       *in_pEvents,
    int32_t         in_TimeoutMilliseconds,
    uint8_t         in_WaitForAll,
    uint32_t       *out_pNumSignaled,
    uint32_t       *out_pSignaledIndices);



///////////////////////////////////////////////////////////////////////////////
///
/// Register a User COIEVENT so that it can be fired. Registered event is
/// a one shot User event; in other words once signaled it cannot be used
/// again for signaling. You have to unregister and register again to enable
/// signaling. An event will be reset if it is re-registered without
/// unregistering, resulting in loss of all outstanding signals.
///
/// @param  out_pEvent
///         [out] Pointer to COIEVENT handle being Registered
///
/// @return COI_SUCCESS an event is successfully registered
///
/// @return COI_INVALID_POINTER if out_pEvent is NULL
///
COIACCESSAPI
COIRESULT
COIEventRegisterUserEvent(
    COIEVENT *out_pEvent);


///////////////////////////////////////////////////////////////////////////////
///
/// Unregister a User COIEVENT. Unregistering a unsignaled event is similar
/// to firing an event. Except Calling COIEventWait on an event that is
/// being unregistered returns COI_EVENT_CANCELED
///
/// @param  in_Event
///         [in] Event Handle to be unregistered.
///
/// @return COI_INVALID_HANDLE if in_Event is not a UserEvent
///
/// @return COI_SUCCESS if an event is successfully unregistered
///
COIACCESSAPI
COIRESULT
COIEventUnregisterUserEvent(
    COIEVENT in_Event);


//////////////////////////////////////////////////////////////////////////////
///
/// A callback that will be invoked to notify the user of an internal
/// runtime event completion.
///
/// As with any callback mechanism it is up to the user to make sure that
/// there are no possible deadlocks due to reentrancy (ie the callback being
/// invoked in the same context that triggered the notification) and also
/// that the callback does not slow down overall processing. If the user
/// performs too much work within the callback it could delay further
/// processing. The callback will be invoked prior to the signaling of
/// the corresponding COIEvent. For example, if a user is waiting
/// for a COIEvent associated with a run function completing they will
/// receive the callback before the COIEvent is marked as signaled.
///
/// @param  in_Event
///         [in] The completion event that is associated with the
///         operation that is being notified.
///
/// @param  in_Result
///         [in] The COIRESULT of the operation.
///
/// @param  in_UserData
///         [in] Opaque data that was provided when the callback was
///         registered. Intel(R) Coprocessor Offload Infrastructure
///         (Intel(R) COI) simply passes this back to the user so that
///         they can interpret it as they choose.
///
typedef void (*COI_EVENT_CALLBACK)(
    COIEVENT            in_Event,
    const   COIRESULT           in_Result,
    const   void               *in_UserData);



//////////////////////////////////////////////////////////////////////////////
///
/// Registers any COIEVENT to receive a one time callback, when the event
/// is marked complete in the offload runtime. If the event has completed
/// before the COIEventRegisterCallback() is called then the callback will
/// immediately be invoked by the calling thread. When the event is
/// registered before the event completes, the runtime gaurantees that
/// the callback will be invoked before COIEventWait() is notified of
/// the same event completing. In well written user code, this may provide
/// a slight performance advantage.
///
/// Users should treat the callback much like an interrupt routine, in regards
/// of performance. Specifically designing the callback to be as short and
/// non blocking as possible. Since the thread that runs the callback is
/// non deterministic blocking or stalling of the callback, may have severe
/// performance impacts on the offload runtime. Thus, it is important to not
/// create deadlocks between the callback and other signaling/waiting
/// mechanisms. It is recommended to never invoke COIEventWait() inside
/// a callback function, as this could lead to immediate deadlocks.
///
/// It is important to note that the runtime cannot distinguish between
/// already triggered events and invalid events. Thus the user needs to pass
/// in a valid event, or the callback will be invoked immediately.
/// Failed events will still receive a callback and the user can query
/// COIEventWait() after the callback for the failed return code.
///
/// If more than one callback is registered for the same event, only the
/// single most current callback will be used, i.e. the older one will
/// be replaced.
///
/// @param  in_Event
///         [in] A valid single event handle to be registered to receive a callback.
///
/// @param  in_Callback
///         [in] Pointer to a user function used to signal an
///         event completion.
///
/// @param  in_UserData
///         [in] Opaque data to pass to the callback when it is invoked.
///
/// @param  in_Flags
///         [in] Reserved parameter for future expansion, required to be zero for now.
///
/// @return COI_INVALID_HANDLE if in_Event is not a valid COIEVENT
///
/// @return COI_INVALID_HANDLE if in_Callback is not a valid pointer.
///
/// @return COI_ARGUMENT_MISMATCH if the in_Flags is not zero.
///
/// @return COI_SUCCESS an event is successfully registered
///
COIACCESSAPI
COIRESULT
COIEventRegisterCallback(
    const COIEVENT                in_Event,
    COI_EVENT_CALLBACK      in_Callback,
    const void                   *in_UserData,
    const uint64_t                in_Flags);



#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* _COIEVENT_SOURCE_H */

/*! @} */