/*
     File:       Multiprocessing.h
 
     Contains:   Multiprocessing interfaces
 
     Version:    Technology: Multiprocessing API version 2.0, integrated nanokernel support
                 Release:    QuickTime 6.0.2
 
     Copyright:  (c) 1995-2001 DayStar Digital, Inc.
 
     Bugs?:      For bug reports, consult the following page on
                 the World Wide Web:
 
                     http://developer.apple.com/bugreporter/
 
*/

/*
   ===========================================================================================
   *** WARNING: You must properly check the availability of MP services before calling them!
   See the section titled "Checking API Availability".
   ===========================================================================================
*/


#ifndef __MULTIPROCESSING__
#define __MULTIPROCESSING__

#ifndef __MACTYPES__
#include <MacTypes.h>
#endif

#ifndef __CODEFRAGMENTS__
#include <CodeFragments.h>
#endif


#ifndef __DRIVERSERVICES__
#include <DriverServices.h>
#endif





#if PRAGMA_ONCE
#pragma once
#endif

#ifdef __cplusplus
extern "C" {
#endif

#if PRAGMA_IMPORT
#pragma import on
#endif

#if PRAGMA_STRUCT_ALIGN
    #pragma options align=power
#elif PRAGMA_STRUCT_PACKPUSH
    #pragma pack(push, 2)
#elif PRAGMA_STRUCT_PACK
    #pragma pack(2)
#endif

/*
   ===========================================================================================
   This is the header file for version 2.0 of the Mac OS multiprocessing support.  This version
   has been totally reimplemented and has significant new services.  The main goal of the
   reimplementation has been to transfer task management into the core operating system to provide
   much more reliable and more efficient operation, including on single processor machines.
   The memory management has also been massively improved, it is much faster and wastes much
   less space.  New services include POSIX style per-task storage, timers with millisecond and
   microsecond resolutions, memory allocation at a specified alignment, and system pageable
   and RAM resident memory pools.  See the MP API documentation for details.
   The old "DayStar" debugging services (whose names began with an underscore) have been
   removed from this header.  A very few are still implemented for binary compatibility, or in
   cases where they happened to be exposed inappropriately.  (E.g. _MPIsFullyInitialized must
   be called to see if the MP API is ReallyTruly(tm) usable.)  New code and recompiles of old
   code should avoid use of these defunct services, except for _MPIsFullyInitialized.
   ===========================================================================================
*/


/*
   ===========================================================================================
   The following services are from the original MP API and remain supported in version 2.0:
    MPProcessors
    MPCreateTask
    MPTerminateTask
    MPCurrentTaskID
    MPYield
    MPExit
    MPCreateQueue
    MPDeleteQueue
    MPNotifyQueue
    MPWaitOnQueue
    MPCreateSemaphore
    MPCreateBinarySemaphore     (In C only, a macro that calls MPCreateSemaphore.)
    MPDeleteSemaphore
    MPSignalSemaphore
    MPWaitOnSemaphore
    MPCreateCriticalRegion
    MPDeleteCriticalRegion
    MPEnterCriticalRegion
    MPExitCriticalRegion
    MPAllocate                  (Deprecated, use MPAllocateAligned for new builds.)
    MPFree
    MPBlockCopy
    MPLibraryIsLoaded           (In C only, a macro.)
    _MPIsFullyInitialized       (See comments about checking for MP API availability.)
   ===========================================================================================
*/


/*
   ===========================================================================================
   The following services are new in version 2.0:
    MPProcessorsScheduled
    MPSetTaskWeight
    MPTaskIsPreemptive
    MPAllocateTaskStorageIndex
    MPDeallocateTaskStorageIndex
    MPSetTaskStorageValue
    MPGetTaskStorageValue
    MPSetQueueReserve
    MPCreateEvent
    MPDeleteEvent
    MPSetEvent
    MPWaitForEvent
    UpTime
    DurationToAbsolute
    AbsoluteToDuration
    MPDelayUntil
    MPCreateTimer
    MPDeleteTimer
    MPSetTimerNotify
    MPArmTimer
    MPCancelTimer
    MPSetExceptionHandler
    MPThrowException
    MPDisposeTaskException
    MPExtractTaskState
    MPSetTaskState
    MPRegisterDebugger
    MPUnregisterDebugger
    MPAllocateAligned           (Preferred over MPAllocate.)
    MPGetAllocatedBlockSize
    MPBlockClear
    MPDataToCode
    MPRemoteCall                (Preferred over _MPRPC.)
   ===========================================================================================
*/


/*
   ===========================================================================================
   The following services are new in version 2.1:
    MPCreateNotification
    MPDeleteNotification
    MPModifyNotification
    MPCauseNotification
    MPGetNextTaskID
    MPGetNextCpuID
   ===========================================================================================
*/


/*
   ===========================================================================================
   The following services are "unofficial" extensions to the original API.  They are not in
   the multiprocessing API documentation, but were in previous versions of this header.  They
   remain supported in version 2.0.  They may not be supported in other environments.
    _MPRPC                      (Deprecated, use MPRemoteCall for new builds.)
    _MPAllocateSys              (Deprecated, use MPAllocateAligned for new builds.)
    _MPTaskIsToolboxSafe
    _MPLibraryVersion
    _MPLibraryIsCompatible
   ===========================================================================================
*/


/*
   ===========================================================================================
   The following services were in previous versions of this header for "debugging only" use.
   They are NOT implemented in version 2.0.  For old builds they can be accessed by defining
   the symbol MPIncludeDefunctServices to have a nonzero value.
    _MPInitializePrintf
    _MPPrintf
    _MPDebugStr
    _MPStatusPString
    _MPStatusCString
   ===========================================================================================
*/


/*
   .
   ===========================================================================================
   General Types and Constants
   ===========================
*/


#define MPCopyrightNotice   \
    "Copyright © 1995-1999 Apple Computer, Inc.\n"
#define MPLibraryName "MPLibrary"
#define MPLibraryCName MPLibraryName
#define MPLibraryPName "\p" MPLibraryName
#define MP_API_Version "2.1"

enum {
    MPLibrary_MajorVersion      = 2,
    MPLibrary_MinorVersion      = 1,
    MPLibrary_Release           = 1,
    MPLibrary_DevelopmentRevision = 1
};


typedef CFragContextID                  MPProcessID;
typedef struct OpaqueMPTaskID*          MPTaskID;
typedef struct OpaqueMPQueueID*         MPQueueID;
typedef struct OpaqueMPSemaphoreID*     MPSemaphoreID;
typedef struct OpaqueMPCriticalRegionID*  MPCriticalRegionID;
typedef struct OpaqueMPTimerID*         MPTimerID;
typedef struct OpaqueMPEventID*         MPEventID;
typedef struct OpaqueMPAddressSpaceID*  MPAddressSpaceID;
typedef struct OpaqueMPNotificationID*  MPNotificationID;
typedef struct OpaqueMPCoherenceID*     MPCoherenceID;
typedef struct OpaqueMPCpuID*           MPCpuID;
typedef struct OpaqueMPOpaqueID*        MPOpaqueID;
enum {
    kMPNoID                     = kInvalidID                    /* New code should use kInvalidID everywhere.*/
};


typedef OptionBits                      MPTaskOptions;
typedef UInt32                          TaskStorageIndex;
typedef UInt32                          TaskStorageValue;
typedef ItemCount                       MPSemaphoreCount;
typedef UInt32                          MPTaskWeight;
typedef UInt32                          MPEventFlags;
typedef UInt32                          MPExceptionKind;
typedef UInt32                          MPTaskStateKind;
typedef UInt32                          MPDebuggerLevel;
enum {
    kDurationImmediate          = 0L,
    kDurationForever            = 0x7FFFFFFF,
    kDurationMillisecond        = 1,
    kDurationMicrosecond        = -1
};


/*
   .
   ===========================================================================================
   Tasking Services
   ================
*/


EXTERN_API_C( ItemCount )
MPProcessors                    (void);

/* The physical total.*/
EXTERN_API_C( ItemCount )
MPProcessorsScheduled           (void);

/* Those currently in use.*/
EXTERN_API_C( OSStatus )
MPGetNextCpuID                  (MPCoherenceID          owningCoherenceID,
                                 MPCpuID *              cpuID);


enum {
                                                                /* For MPCreateTask options*/
    kMPCreateTaskTakesAllExceptionsMask = 1L << 1,
    kMPCreateTaskValidOptionsMask = kMPCreateTaskTakesAllExceptionsMask
};


/* -------------------------------------------------------------------------------------------*/


typedef CALLBACK_API_C( OSStatus , TaskProc )(void *parameter);
EXTERN_API_C( OSStatus )
MPCreateTask                    (TaskProc               entryPoint,
                                 void *                 parameter,
                                 ByteCount              stackSize,
                                 MPQueueID              notifyQueue,
                                 void *                 terminationParameter1,
                                 void *                 terminationParameter2,
                                 MPTaskOptions          options,
                                 MPTaskID *             task);

EXTERN_API_C( OSStatus )
MPTerminateTask                 (MPTaskID               task,
                                 OSStatus               terminationStatus);

EXTERN_API_C( OSStatus )
MPSetTaskWeight                 (MPTaskID               task,
                                 MPTaskWeight           weight);

EXTERN_API_C( Boolean )
MPTaskIsPreemptive              (MPTaskID               taskID);

/* May be kInvalidID.*/
EXTERN_API_C( void )
MPExit                          (OSStatus               status);

EXTERN_API_C( void )
MPYield                         (void);

EXTERN_API_C( MPTaskID )
MPCurrentTaskID                 (void);

EXTERN_API_C( OSStatus )
MPGetNextTaskID                 (MPProcessID            owningProcessID,
                                 MPTaskID *             taskID);


/* -------------------------------------------------------------------------------------------*/


/*
   ---------------------------------------------------
   ! The task storage services are new in version 2.0.
*/


EXTERN_API_C( OSStatus )
MPAllocateTaskStorageIndex      (TaskStorageIndex *     index);

EXTERN_API_C( OSStatus )
MPDeallocateTaskStorageIndex    (TaskStorageIndex       index);

EXTERN_API_C( OSStatus )
MPSetTaskStorageValue           (TaskStorageIndex       index,
                                 TaskStorageValue       value);

EXTERN_API_C( TaskStorageValue )
MPGetTaskStorageValue           (TaskStorageIndex       index);


/*
   .
   ===========================================================================================
   Synchronization Services
   ========================
*/


EXTERN_API_C( OSStatus )
MPCreateQueue                   (MPQueueID *            queue);

EXTERN_API_C( OSStatus )
MPDeleteQueue                   (MPQueueID              queue);

EXTERN_API_C( OSStatus )
MPNotifyQueue                   (MPQueueID              queue,
                                 void *                 param1,
                                 void *                 param2,
                                 void *                 param3);

EXTERN_API_C( OSStatus )
MPWaitOnQueue                   (MPQueueID              queue,
                                 void **                param1,
                                 void **                param2,
                                 void **                param3,
                                 Duration               timeout);

EXTERN_API_C( OSStatus )
MPSetQueueReserve               (MPQueueID              queue,
                                 ItemCount              count);


/* -------------------------------------------------------------------------------------------*/


EXTERN_API_C( OSStatus )
MPCreateSemaphore               (MPSemaphoreCount       maximumValue,
                                 MPSemaphoreCount       initialValue,
                                 MPSemaphoreID *        semaphore);

EXTERN_API_C( OSStatus )
MPDeleteSemaphore               (MPSemaphoreID          semaphore);

EXTERN_API_C( OSStatus )
MPSignalSemaphore               (MPSemaphoreID          semaphore);

EXTERN_API_C( OSStatus )
MPWaitOnSemaphore               (MPSemaphoreID          semaphore,
                                 Duration               timeout);


#define MPCreateBinarySemaphore(semaphore)  \
            MPCreateSemaphore ( 1, 1, (semaphore) )

/* -------------------------------------------------------------------------------------------*/


EXTERN_API_C( OSStatus )
MPCreateCriticalRegion          (MPCriticalRegionID *   criticalRegion);

EXTERN_API_C( OSStatus )
MPDeleteCriticalRegion          (MPCriticalRegionID     criticalRegion);

EXTERN_API_C( OSStatus )
MPEnterCriticalRegion           (MPCriticalRegionID     criticalRegion,
                                 Duration               timeout);

EXTERN_API_C( OSStatus )
MPExitCriticalRegion            (MPCriticalRegionID     criticalRegion);


/* -------------------------------------------------------------------------------------------*/

EXTERN_API( OSStatus )
MPCreateEvent                   (MPEventID *            event);

EXTERN_API_C( OSStatus )
MPDeleteEvent                   (MPEventID              event);

EXTERN_API_C( OSStatus )
MPSetEvent                      (MPEventID              event,
                                 MPEventFlags           flags);

EXTERN_API( OSStatus )
MPWaitForEvent                  (MPEventID              event,
                                 MPEventFlags *         flags,
                                 Duration               timeout);

/*
   .
   ===========================================================================================
   Notification Services (API)
   =====================
*/



EXTERN_API_C( OSStatus )
MPCreateNotification            (MPNotificationID *     notificationID);

/* -------------------------------------------------------------------------------------------*/

EXTERN_API_C( OSStatus )
MPDeleteNotification            (MPNotificationID       notificationID);

/* -------------------------------------------------------------------------------------------*/

EXTERN_API_C( OSStatus )
MPModifyNotification            (MPNotificationID       notificationID,
                                 MPOpaqueID             anID,
                                 void *                 notifyParam1,
                                 void *                 notifyParam2,
                                 void *                 notifyParam3);

/* -------------------------------------------------------------------------------------------*/

EXTERN_API_C( OSStatus )
MPCauseNotification             (MPNotificationID       notificationID);



/*
   .
   ===========================================================================================
   Timer Services
   ==============
*/


/*
   --------------------------------------------
   ! The timer services are new in version 2.0.
*/


#if 0
/* For now these are taken from DriverServices, should be in a better place.*/
#if CALL_NOT_IN_CARBON
EXTERN_API_C( AbsoluteTime )
UpTime                          (void);

EXTERN_API_C( AbsoluteTime )
DurationToAbsolute              (Duration               duration);

EXTERN_API_C( Duration )
AbsoluteToDuration              (AbsoluteTime           time);

#endif  /* CALL_NOT_IN_CARBON */

#endif  /* 0 */

enum {
                                                                /* For MPArmTimer options*/
    kMPPreserveTimerIDMask      = 1L << 0,
    kMPTimeIsDeltaMask          = 1L << 1,
    kMPTimeIsDurationMask       = 1L << 2
};


EXTERN_API_C( OSStatus )
MPDelayUntil                    (AbsoluteTime *         expirationTime);

EXTERN_API_C( OSStatus )
MPCreateTimer                   (MPTimerID *            timerID);

EXTERN_API_C( OSStatus )
MPDeleteTimer                   (MPTimerID              timerID);

EXTERN_API_C( OSStatus )
MPSetTimerNotify                (MPTimerID              timerID,
                                 MPOpaqueID             anID,
                                 void *                 notifyParam1,
                                 void *                 notifyParam2,
                                 void *                 notifyParam3);

EXTERN_API_C( OSStatus )
MPArmTimer                      (MPTimerID              timerID,
                                 AbsoluteTime *         expirationTime,
                                 OptionBits             options);

EXTERN_API_C( OSStatus )
MPCancelTimer                   (MPTimerID              timerID,
                                 AbsoluteTime *         timeRemaining);


/*
   .
   ===========================================================================================
   Memory Services
   ===============
*/


enum {
                                                                /* Maximum allocation request size is 1GB.*/
    kMPMaxAllocSize             = 1024L * 1024 * 1024
};

enum {
                                                                /* Values for the alignment parameter to MPAllocateAligned.*/
    kMPAllocateDefaultAligned   = 0,
    kMPAllocate8ByteAligned     = 3,
    kMPAllocate16ByteAligned    = 4,
    kMPAllocate32ByteAligned    = 5,
    kMPAllocate1024ByteAligned  = 10,
    kMPAllocate4096ByteAligned  = 12,
    kMPAllocateMaxAlignment     = 16,                           /* Somewhat arbitrary limit on expectations.*/
    kMPAllocateAltiVecAligned   = kMPAllocate16ByteAligned,     /* The P.C. name.*/
    kMPAllocateVMXAligned       = kMPAllocateAltiVecAligned,    /* The older, common name.*/
    kMPAllocateVMPageAligned    = 254,                          /* Pseudo value, converted at runtime.*/
    kMPAllocateInterlockAligned = 255                           /* Pseudo value, converted at runtime.*/
};

enum {
                                                                /* Values for the options parameter to MPAllocateAligned.*/
    kMPAllocateClearMask        = 0x0001,                       /* Zero the allocated block.*/
    kMPAllocateGloballyMask     = 0x0002,                       /* Allocate from the globally visible pool.*/
    kMPAllocateResidentMask     = 0x0004,                       /* Allocate from the RAM-resident pool.*/
    kMPAllocateNoGrowthMask     = 0x0010                        /* Do not attempt to grow the pool.*/
};


/* -------------------------------------------------------------------------------------------*/


EXTERN_API_C( LogicalAddress )
MPAllocateAligned               (ByteCount              size,
                                 UInt8                  alignment,
                                 OptionBits             options);

/* ! MPAllocateAligned is new in version 2.0.*/
EXTERN_API_C( LogicalAddress )
MPAllocate                      (ByteCount              size);

/* Use MPAllocateAligned instead.*/
EXTERN_API_C( void )
MPFree                          (LogicalAddress         object);

EXTERN_API_C( ByteCount )
MPGetAllocatedBlockSize         (LogicalAddress         object);

/* -------------------------------------------------------------------------------------------*/


EXTERN_API_C( void )
MPBlockCopy                     (LogicalAddress         source,
                                 LogicalAddress         destination,
                                 ByteCount              size);

EXTERN_API_C( void )
MPBlockClear                    (LogicalAddress         address,
                                 ByteCount              size);

/* ! MPBlockClear is new in version 2.0.*/
EXTERN_API_C( void )
MPDataToCode                    (LogicalAddress         address,
                                 ByteCount              size);

/* ! MPDataToCode is new in version 2.0.*/
/*
   .
   ===========================================================================================
   Exception/Debugging Services
   ============================
*/


/*
   -------------------------------------------------------------------------------------------
   *** Important Note ***
   ----------------------
   
   The functions MPExtractTaskState and MPSetTaskState infer the size of the "info" buffer
   from the "kind" parameter.  A given value for MPTaskStateKind will always refer to a
   single specific physical buffer layout.  Should new register sets be added, or the size
   or number of any registers change, new values of MPTaskStateKind will be introduced to
   refer to the new buffer layouts.
   
   The following types for the buffers are in MachineExceptions. The correspondence between
   MPTaskStateKind values and MachineExceptions types is:
   
        kMPTaskStateRegisters               -> RegisterInformation
        kMPTaskStateFPU                     -> FPUInformation
        kMPTaskStateVectors                 -> VectorInformation
        kMPTaskStateMachine                 -> MachineInformation
        kMPTaskState32BitMemoryException    -> ExceptionInfo for old-style 32-bit memory exceptions
   
    For reference, on PowerPC the MachineExceptions types contain:
   
        RegisterInformation -> The GPRs, 32 values of 64 bits each.
        FPUInformation      -> The FPRs plus FPSCR, 32 values of 64 bits each, one value of
                                32 bits.
        VectorInformation   -> The AltiVec vector registers plus VSCR and VRSave, 32 values
                                of 128 bits each, one value of 128 bits, and one 32 bit value.
        MachineInformation  -> The CTR, LR, PC, each of 64 bits.  The CR, XER, MSR, MQ,
                                exception kind, and DSISR, each of 32 bits.  The 64 bit DAR.
        ExceptionInfo       -> Only memory exceptions are specified, 4 fields of 32 bits each.
                                Note that this type only covers memory exceptions on 32-bit CPUs!
   The following types are declared here:
        kMPTaskStateTaskInfo                -> MPTaskInfo
*/

enum {
                                                                /* Values for the TaskStateKind to MPExtractTaskState and MPSetTaskState.*/
    kMPTaskStateRegisters       = 0,                            /* The task general registers.*/
    kMPTaskStateFPU             = 1,                            /* The task floating point registers*/
    kMPTaskStateVectors         = 2,                            /* The task vector registers*/
    kMPTaskStateMachine         = 3,                            /* The task machine registers*/
    kMPTaskState32BitMemoryException = 4                        /* The task memory exception information for 32-bit CPUs.*/
};

enum {
    kMPTaskStateTaskInfo        = 5                             /* Static and dynamic information about the task.*/
};

enum {
                                                                /* Option bits and numbers for MPDisposeTaskException.*/
    kMPTaskPropagate            = 0,                            /* The exception is propagated.*/
    kMPTaskResumeStep           = 1,                            /* The task is resumed and single step is enabled.*/
    kMPTaskResumeBranch         = 2,                            /* The task is resumed and branch stepping is enabled.*/
    kMPTaskResumeMask           = 0x0000,                       /* The task is resumed.*/
    kMPTaskPropagateMask        = 1 << kMPTaskPropagate,        /* The exception is propagated.*/
    kMPTaskResumeStepMask       = 1 << kMPTaskResumeStep,       /* The task is resumed and single step is enabled.*/
    kMPTaskResumeBranchMask     = 1 << kMPTaskResumeBranch      /* The task is resumed and branch stepping is enabled.*/
};


enum {
                                                                /* For kMPTaskStateTaskInfo, the task's runState*/
    kMPTaskBlocked              = 0,                            /* Task is blocked (queued on resource)*/
    kMPTaskReady                = 1,                            /* Task is runnable*/
    kMPTaskRunning              = 2                             /* Task is running*/
};

enum {
                                                                /* For kMPTaskStateTaskInfo, the version of the MPTaskInfo structure requested.*/
    kMPTaskInfoVersion          = 2
};



struct MPTaskInfo {
    PBVersion                       version;                    /* Version of the data structure requested*/

    OSType                          name;                       /* Task name*/

    OSType                          queueName;                  /* Task's queue owner name*/
    UInt16                          runState;                   /* Running, ready, blocked*/
    UInt16                          lastCPU;                    /* Address of CPU where task previously ran*/
    UInt32                          weight;                     /* Processing weight: 1 - 10,000*/

    MPProcessID                     processID;                  /* Owning process ID*/

    AbsoluteTime                    cpuTime;                    /* Accumulated task time*/
    AbsoluteTime                    schedTime;                  /* Time when last scheduled*/
    AbsoluteTime                    creationTime;               /* Time when task created*/

    ItemCount                       codePageFaults;             /* Page faults from code execution*/
    ItemCount                       dataPageFaults;             /* Page faults from data access*/
    ItemCount                       preemptions;                /* Number of times task was preempted*/

    MPCpuID                         cpuID;                      /* ID of CPU where task previously ran*/
};
typedef struct MPTaskInfo               MPTaskInfo;
/*
    Upon a task exception, the following message is sent to the designated queue:
      1. The MPTaskID, 
      2. The exception kind. These are enumerated in the interfaces header MachineExceptions.h 
      3. N/A
*/



/* -------------------------------------------------------------------------------------------*/

EXTERN_API_C( OSStatus )
MPSetExceptionHandler           (MPTaskID               task,
                                 MPQueueID              exceptionQ);

EXTERN_API_C( OSStatus )
MPDisposeTaskException          (MPTaskID               task,
                                 OptionBits             action);

EXTERN_API_C( OSStatus )
MPExtractTaskState              (MPTaskID               task,
                                 MPTaskStateKind        kind,
                                 void *                 info);

EXTERN_API_C( OSStatus )
MPSetTaskState                  (MPTaskID               task,
                                 MPTaskStateKind        kind,
                                 void *                 info);

EXTERN_API_C( OSStatus )
MPThrowException                (MPTaskID               task,
                                 MPExceptionKind        kind);

/* -------------------------------------------------------------------------------------------*/

EXTERN_API_C( OSStatus )
MPRegisterDebugger              (MPQueueID              queue,
                                 MPDebuggerLevel        level);

EXTERN_API_C( OSStatus )
MPUnregisterDebugger            (MPQueueID              queue);



/*
   .
   ===========================================================================================
   Remote Call Services
   ====================
*/

typedef CALLBACK_API_C( void *, MPRemoteProcedure )(void *parameter);

typedef UInt8                           MPRemoteContext;
enum {
    kMPAnyRemoteContext         = 0,
    kMPOwningProcessRemoteContext = 1
};


EXTERN_API_C( void *)
MPRemoteCall                    (MPRemoteProcedure      remoteProc,
                                 void *                 parameter,
                                 MPRemoteContext        context);

/* ! MPRemoteCall is new in version 2.0.*/
/*
   .
   ===========================================================================================
   Checking API Availability
   =========================
*/


/*
   ===========================================================================================
   *** WARNING: You must properly check the availability of MP services before calling them!
   ===========================================================================================
   
   Checking for the availability of the MP API is rather ugly.  This is a historical problem,
   caused by the original implementation letting itself get prepared when it really wasn't
   usable and complicated by some important clients then depending on weak linking to "work".
   (And further complicated by CFM not supporting "deferred" imports, which is how many
   programmers think weak imports work.)
   
   The end result is that the MP API library may get prepared by CFM but be totally unusable.
   This means that if you import from the MP API library, you cannot simply check for a
   resolved import to decide if MP services are available.  Worse, if you explicitly prepare
   the MP API library you cannot assume that a noErr result from GetSharedLibrary means that
   MP services are available.
   
   o If you import from the MP API library you MUST:
   
        Use the MPLibraryIsLoaded macro (or equivalent code in languages other than C) to tell
        if the MP API services are available.  It is not sufficient to simply check that an
        imported symbol is resolved as is commonly done for other libraries.  The macro expands
        to the expression:
   
            ( ( (UInt32)_MPIsFullyInitialized != (UInt32)kUnresolvedCFragSymbolAddress ) &&
              ( _MPIsFullyInitialized () ) )
   
        This checks if the imported symbol _MPIsFullyInitialized is resolved and if resolved
        calls it.  Both parts must succeed for the MP API services to be available.
   
   o If you explicitly prepare the MP API library you MUST:
   
        Use code similar to the following example to tell if the MP API services are available.
        It is not sufficient to depend on just a noErr result from GetSharedLibrary.
   
            OSErr                       err;
            Boolean                     mpIsAvailable           = false;
            CFragConnectionID           connID                  = kInvalidID;
            MPIsFullyInitializedProc    mpIsFullyInitialized    = NULL;
   
            err = GetSharedLibrary  ( "\pMPLibrary", kCompiledCFragArch, kReferenceCFrag,
                                      &connID, NULL, NULL );
   
            if ( err == noErr ) {
                err = FindSymbol    ( connID, "\p_MPIsFullyInitialized",
                                      (Ptr *) &mpIsFullyInitialized, NULL );
            }
   
            if ( err == noErr ) {
                mpIsAvailable = (* mpIsFullyInitialized) ();
            }
   
   ===========================================================================================
*/


EXTERN_API_C( Boolean )
_MPIsFullyInitialized           (void);

typedef CALLBACK_API_C( Boolean , MPIsFullyInitializedProc )(void );
#define MPLibraryIsLoaded()     \
            ( ( (UInt32)_MPIsFullyInitialized != (UInt32)kUnresolvedCFragSymbolAddress ) && \
              ( _MPIsFullyInitialized () ) )
/*
   .
   ===========================================================================================
   Miscellaneous Services
   ======================
*/


EXTERN_API_C( void )
_MPLibraryVersion               (const char **          versionCString,
                                 UInt32 *               major,
                                 UInt32 *               minor,
                                 UInt32 *               release,
                                 UInt32 *               revision);

/*
   .
   ===========================================================================================
   Unofficial Services
   ===================
*/


/*
   ===========================================================================================
   *** WARNING ***
   These services are not part of the officially documented multiprocessing API.  They may not
   be avaliable in future versions of Mac OS multiprocessing support, or in environments that
   have a different underlying OS architecture such as Mac OS on top of a microkernel, the
   Mac OS Blue Box under Mac OS X, native MP support in Mac OS X, etc.
   ===========================================================================================
*/

#if CALL_NOT_IN_CARBON
#if CALL_NOT_IN_CARBON
EXTERN_API_C( LogicalAddress )
_MPAllocateSys                  (ByteCount              size);

/* Use MPAllocateAligned instead.*/
EXTERN_API_C( void *)
_MPRPC                          (MPRemoteProcedure      remoteProc,
                                 void *                 parameter);

/* Use _MPRemoteCall instead.*/
EXTERN_API_C( Boolean )
_MPTaskIsToolboxSafe            (MPTaskID               task);

#endif  /* CALL_NOT_IN_CARBON */

#endif  /* CALL_NOT_IN_CARBON */

EXTERN_API_C( Boolean )
_MPLibraryIsCompatible          (const char *           versionCString,
                                 UInt32                 major,
                                 UInt32                 minor,
                                 UInt32                 release,
                                 UInt32                 revision);


#define MPRPC                   _MPRPC
#define MPTaskIsToolboxSafe     _MPTaskIsToolboxSafe

/*
   .
   ===========================================================================================
   Defunct Services
   ================
*/

#if CALL_NOT_IN_CARBON
#ifndef MPIncludeDefunctServices
#define MPIncludeDefunctServices 0
#endif  /* !defined(MPIncludeDefunctServices) */

#if MPIncludeDefunctServices
#if CALL_NOT_IN_CARBON
EXTERN_API_C( void )
_MPDebugStr                     (ConstStr255Param       msg);

EXTERN_API_C( StringPtr )
_MPStatusPString                (OSStatus               status);

EXTERN_API_C( const char *)
_MPStatusCString                (OSStatus               status);


#endif  /* CALL_NOT_IN_CARBON */

#include <stdarg.h>
typedef CALLBACK_API_C( void , MPPrintfHandler )(MPTaskID taskID, const char *format, va_list args);
#if CALL_NOT_IN_CARBON
EXTERN_API_C( void )
_MPInitializePrintf             (MPPrintfHandler        pfn);

EXTERN_API_C( void )
_MPPrintf                       (const char *           format,
                                 ...);

#endif  /* CALL_NOT_IN_CARBON */

#endif  /* MPIncludeDefunctServices */

#endif  /* CALL_NOT_IN_CARBON */

/* ===========================================================================================*/



#if PRAGMA_STRUCT_ALIGN
    #pragma options align=reset
#elif PRAGMA_STRUCT_PACKPUSH
    #pragma pack(pop)
#elif PRAGMA_STRUCT_PACK
    #pragma pack()
#endif

#ifdef PRAGMA_IMPORT_OFF
#pragma import off
#elif PRAGMA_IMPORT
#pragma import reset
#endif

#ifdef __cplusplus
}
#endif

#endif /* __MULTIPROCESSING__ */

