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Annotation of XNU/osfmk/kern/sf.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  * 
        !            25:  */
        !            26: 
        !            27: #ifndef        _KERN_SF_H_
        !            28: #define _KERN_SF_H_
        !            29: 
        !            30: /*
        !            31:  * The calls most likely to change are: policy_thread_done and
        !            32:  * policy_thread_begin.  They're the policy calls related to 
        !            33:  * context switching. I'm not satisfied with what I have now and
        !            34:  * these are the forms I'm trying next.
        !            35:  * 
        !            36:  * I still have to merge the data type names from my different sandboxes
        !            37:  * and I don't really talk about locking except for the run queue locking.
        !            38:  * 
        !            39:  * A good example of the data type problem is sched_thread_t and thread_t.
        !            40:  * Right now, they're equivalent BUT eventually, i expect that policies
        !            41:  * will only use sched_thread_t which will only contain the scheduling
        !            42:  * attributes and the framework will know how to convert sched_thread_t
        !            43:  * to thread_t (policy-mechanism seperation).
        !            44:  * 
        !            45:  * There is a big change for run queues: there is a single lock for an
        !            46:  * entire run queue array structure (instead of a lock per queue header).
        !            47:  * It's OK for a policy to reorganize a particular queue BUT it has to
        !            48:  * disable the queue header (sched_queue_disable).  Since a queue header
        !            49:  * isn't shared by multiple policies and the framework won't touch the
        !            50:  * queue header if it's disabled, the policy can do anything it wants
        !            51:  * without taking out a global lock.
        !            52:  * 
        !            53:  * The only run queue primitives provided are the really fast ones:
        !            54:  * insert at the head (sched_queue_preempt), insert at the tail
        !            55:  * and if the queue was empty check for preemption 
        !            56:  * (sched_queue_add_preempt), just insert at the tail
        !            57:  * (sched_queue_add_only), and remove (sched_queue_remove).  Everything
        !            58:  * else needs to be done by first disabling the queue header (and then
        !            59:  * you can do whatever you want to the queue).
        !            60:  * 
        !            61:  * BTW, the convention here is:
        !            62:  * 
        !            63:  *    policy_xxx - calls from the framework into policies (via the
        !            64:  *     pointers in the policy object)
        !            65:  * 
        !            66:  *    sched_xxx - scheduling mechanisms provided by the framework
        !            67:  *         which can be called by policies.
        !            68:  * 
        !            69:  * ----------
        !            70:  * 
        !            71:  * Initializes an instance of a scheduling policy assigning it the
        !            72:  * corresponding policy_id and run queue headers.
        !            73:  * 
        !            74:  * policy_init(
        !            75:  *     sched_policy_object      *policy,
        !            76:  *     int policy_id,                          / * policy number * /
        !            77:  *     int priority_mask_length,                       / * length of a priority mask * /
        !            78:  *     sched_priority_mask *priority_mask );   / * mask for this policy * /
        !            79:  * 
        !            80:  * Enable/disable a scheduling policy on a processor [set]
        !            81:  * 
        !            82:  * policy_enable_processor_set(
        !            83:  *     sched_policy_object *policy,            / * policy * /
        !            84:  *     processor_set_t processor_set );                / * processor set * /
        !            85:  * 
        !            86:  * policy_disable_processor_set(
        !            87:  *     sched_policy_object *policy,
        !            88:  *     processor_set_t processor_set);
        !            89:  * 
        !            90:  * policy_enable_processor(
        !            91:  *     sched_policy_object *policy,            / * policy * /
        !            92:  *     processor_t processor );                        / * processor set * /
        !            93:  * 
        !            94:  * policy_disable_processor(
        !            95:  *     sched_policy_object *policy,
        !            96:  *     processor_t processor);
        !            97:  * 
        !            98:  * Notifies the policy that the thread has become runnable
        !            99:  * 
        !           100:  * policy_thread_unblock(
        !           101:  *     sched_policy_object *policy,
        !           102:  *     sched_thread_t thread )
        !           103:  * 
        !           104:  * Notifies the policy that the current thread is done or
        !           105:  * a new thread has been selected to run
        !           106:  * 
        !           107:  * policy_thread_done(
        !           108:  *     sched_policy_object *policy,
        !           109:  *     sched_thread_t *old_thread );
        !           110:  * 
        !           111:  * policy_thread_begin(
        !           112:  *     sched_policy_object *policy,
        !           113:  *     sched_thread_t *new_thread );
        !           114:  * 
        !           115:  * Attach/detach a thread from the scheduling policy
        !           116:  * 
        !           117:  * policy_thread_attach(
        !           118:  *     sched_policy_object *policy,
        !           119:  *     sched_thread_t *thread );
        !           120:  * 
        !           121:  * policy_thread_detach(
        !           122:  *     sched_policy_object *policy,
        !           123:  *     sched_thread_t *thread );
        !           124:  * 
        !           125:  * Set the thread's processor [set]
        !           126:  * 
        !           127:  * policy_thread_processor(
        !           128:  *     sched_policy_object *policy,
        !           129:  *     sched_thread_t *thread,
        !           130:  *     processor_t processor );
        !           131:  * 
        !           132:  * policy_thread_processor_set(
        !           133:  *     sched_policy_object *policy,
        !           134:  *     sched_thread_t *thread,
        !           135:  *     processor_set_t processor_set);
        !           136:  * 
        !           137:  * Set/get a thread's scheduling attributes
        !           138:  * 
        !           139:  * policy_thread_set(
        !           140:  *     sched_policy_object *policy,
        !           141:  *     sched_thread_t thread,
        !           142:  *     sched_policy_attributes policy_attributes);
        !           143:  * 
        !           144:  * policy_thread_get(
        !           145:  *     sched_policy_object *policy,
        !           146:  *     sched_thread_t thread,
        !           147:  *     sched_policy_attributes *policy_attributes);
        !           148:  * 
        !           149:  * Scheduling Framework Interfaces
        !           150:  * 
        !           151:  * [en/dis]able particular run queue headers on a processor [set],
        !           152:  * 
        !           153:  * Lock the run queues, update the mask, unlock the run queues.  If
        !           154:  * enabling, check preemption.
        !           155:  * 
        !           156:  * sched_queue_enable(
        !           157:  *     run_queue_t             runq,
        !           158:  *     sched_priority_mask *mask );
        !           159:  * 
        !           160:  * sched_queue_disable(
        !           161:  *     run_queue_t             runq,
        !           162:  *     sched_priority_mask *mask );
        !           163:  * 
        !           164:  * Lock the run queues, insert the thread at the head, unlock the
        !           165:  * run queues and preempt (if possible).
        !           166:  * 
        !           167:  * sched_queue_preempt(
        !           168:  *     meta_priority_t priority,
        !           169:  *     thread_t                thread,
        !           170:  *     run_queue_t             run_queues );
        !           171:  * 
        !           172:  * Lock the run queues, add the thread to the tail, unlock the run queues
        !           173:  * and preempt if appropriate.
        !           174:  * 
        !           175:  * sched_queue_add_preempt(
        !           176:  *     meta_priority_t priority,
        !           177:  *     thread_t                thread,
        !           178:  *     run_queue_t             run_queues );
        !           179:  * 
        !           180:  * Lock the run queues, add the thread to the tail, unlock the queues
        !           181:  * but don't check for preemption.
        !           182:  * 
        !           183:  * sched_queue_add_only(
        !           184:  *     meta_priority_t priority,
        !           185:  *     thread_t                thread,
        !           186:  *     run_queue_t             run_queues );
        !           187:  * 
        !           188:  * Lock the run queues, remove the entry the thread, unlock the run queues.
        !           189:  * 
        !           190:  * sched_queue_remove(
        !           191:  *     thread_t                thread );
        !           192:  */
        !           193: 
        !           194: #include <kern/kern_types.h>
        !           195: #include <kern/sched.h>
        !           196: #include <mach/thread_switch.h>
        !           197: #include <mach/mach_types.h>
        !           198: 
        !           199: /*
        !           200:  * Type definitions and constants for MK Scheduling Framework
        !           201:  */
        !           202: typedef int    sf_return_t;
        !           203: 
        !           204: /* successful completion */
        !           205: #define SF_SUCCESS                                     0
        !           206: 
        !           207: /* error codes */
        !           208: #define SF_FAILURE                                     1
        !           209: #define SF_KERN_RESOURCE_SHORTAGE      2
        !           210: 
        !           211: /* Scheduler Framework Object -- i.e., a scheduling policy */
        !           212: typedef struct sf_policy       *sf_object_t;
        !           213: 
        !           214: /* Scheduler Framework thread definition is just a thread (for now) */
        !           215: typedef thread_t                       sched_thread_t;
        !           216: 
        !           217: /* Scheduler Framework priority mask definition */
        !           218: typedef struct {
        !           219:        int bitmap[NRQBM];
        !           220: } sf_priority_mask, *sf_priority_mask_t;
        !           221: 
        !           222: /* Scheduler Framework meta-priority definition is just an int (for now) */
        !           223: typedef int    meta_priority_t;
        !           224: 
        !           225: /**********
        !           226:  *
        !           227:  * Scheduling Attributes
        !           228:  *
        !           229:  **********/
        !           230: 
        !           231: struct sp_attributes {
        !           232:        int                     policy_id;      /* index of SP for kernel */
        !           233: };
        !           234: 
        !           235: typedef int    sp_attributes_size_t;
        !           236: 
        !           237: #define SP_ATTRIBUTES_NULL     ((sp_attributes_t) 0)
        !           238: 
        !           239: /**********
        !           240:  *
        !           241:  * Scheduling Information
        !           242:  *
        !           243:  **********/
        !           244: 
        !           245: /*** ??? typedef void  *sp_info_t; ***/
        !           246: typedef int    sp_info_size_t;
        !           247: 
        !           248: #define SP_INFO_NULL           ((sp_info_t) 0)
        !           249: 
        !           250: /*
        !           251:  * maximum number of scheduling policies that the Scheduling Framework
        !           252:  * will host (picked arbitrarily)
        !           253:  */
        !           254: #define MAX_SCHED_POLS         ( 10 )
        !           255: 
        !           256: /**********
        !           257:  *
        !           258:  * Scheduling Framework Interfaces
        !           259:  *
        !           260:  **********/
        !           261: 
        !           262: /* Initialize Framework and selected policies */
        !           263: void           sf_init(void);
        !           264: 
        !           265: /* [En/Dis]able particular run queue headers on a processor [set] */
        !           266: 
        !           267: /* Lock run queues, update mask, unlock run queues.  If enabling, check preemption */
        !           268: sf_return_t    (*sf_queue_enable)(
        !           269:                    run_queue_t         runq,
        !           270:                    sf_priority_mask    *mask);
        !           271: 
        !           272: sf_return_t    (*sf_queue_disable)(
        !           273:                    run_queue_t         runq,
        !           274:                    sf_priority_mask    *mask);
        !           275: 
        !           276: /* Lock run queues, insert thread at head, unlock run queues and preempt (if possible) */
        !           277: sf_return_t    (*sf_queue_preempt)(
        !           278:                    meta_priority_t     priority,
        !           279:                    thread_t            thread,
        !           280:                    run_queue_t         run_queues);
        !           281: 
        !           282: /* Lock run queues, add thread to tail, unlock run queues and preempt if appropriate */
        !           283: sf_return_t    (*sf_queue_add_preempt)(
        !           284:                    meta_priority_t     priority,
        !           285:                    thread_t            thread,
        !           286:                    run_queue_t         run_queues);
        !           287: 
        !           288: /* Lock run queues, add thread to tail, unlock queues but don't check for preemption */
        !           289: sf_return_t    (*sf_queue_add_only)(
        !           290:                    meta_priority_t     priority,
        !           291:                    thread_t            thread,
        !           292:                    run_queue_t         run_queues);
        !           293: 
        !           294: /* Lock run queues, remove thread entry, unlock run queues */
        !           295: sf_return_t    (*sf_queue_remove)(
        !           296:                    thread_t            thread);
        !           297: 
        !           298: /**********
        !           299:  *
        !           300:  * Scheduling Policy Interfaces
        !           301:  *
        !           302:  **********/
        !           303: 
        !           304: /*
        !           305:  * Operation list for scheduling policies.  (Modeled after the
        !           306:  * device operations `.../mach_kernel/device/conf.h.')
        !           307:  *
        !           308:  * Key to some abbreviations:
        !           309:  *     sp = scheduling policy
        !           310:  *     sf = scheduling framework
        !           311:  */
        !           312: typedef struct sched_policy_ops {
        !           313:     /* Initialize an instance of a scheduling policy */
        !           314:     sf_return_t        (*sp_init)(
        !           315:                sf_object_t                     policy,
        !           316:                int                                     policy_id,
        !           317:                int                                     priority_mask_length,
        !           318:                sf_priority_mask        *priority_mask);
        !           319: 
        !           320:     /* Enable/disable a scheduling policy on a processor [set] */
        !           321:     sf_return_t        (*sp_enable_processor_set)(
        !           322:                sf_object_t                     policy,
        !           323:                processor_set_t         processor_set);
        !           324: 
        !           325:     sf_return_t        (*sp_disable_processor_set)(
        !           326:                sf_object_t                     policy,
        !           327:                processor_set_t         processor_set);
        !           328: 
        !           329:     sf_return_t        (*sp_enable_processor)(
        !           330:                sf_object_t                     policy,
        !           331:                processor_t                     processor);
        !           332: 
        !           333:     sf_return_t        (*sp_disable_processor)(
        !           334:                sf_object_t                     policy,
        !           335:                processor_t                     processor);
        !           336: 
        !           337:     /* Allow the policy to update the meta-priority of a running thread */
        !           338:     sf_return_t        (*sp_thread_update_mpri)(
        !           339:                sf_object_t                     policy,
        !           340:                sched_thread_t          thread);
        !           341: 
        !           342:     /* Notify the policy that a thread has become runnable */
        !           343:     sf_return_t        (*sp_thread_unblock)(
        !           344:                sf_object_t                     policy,
        !           345:                sched_thread_t          thread);
        !           346: 
        !           347:     /* Notify the policy that the current thread is done */
        !           348:     /*** ??? Should this call take a `reason' argument? ***/
        !           349:     sf_return_t        (*sp_thread_done)(
        !           350:                sf_object_t                     policy,
        !           351:                sched_thread_t          old_thread);
        !           352: 
        !           353:     /* Notify the policy that a new thread has been selected to run */
        !           354:     sf_return_t        (*sp_thread_begin)(
        !           355:                sf_object_t                     policy,
        !           356:                sched_thread_t          new_thread);
        !           357: 
        !           358:     /* Notify the policy that an old thread is ready to be requeued */
        !           359:     sf_return_t        (*sp_thread_dispatch)(
        !           360:                sf_object_t                     policy,
        !           361:                sched_thread_t          old_thread);
        !           362: 
        !           363:     /* Attach/detach a thread from the scheduling policy */
        !           364:     sf_return_t        (*sp_thread_attach)(
        !           365:                sf_object_t                     policy,
        !           366:                sched_thread_t          thread);
        !           367: 
        !           368:     sf_return_t        (*sp_thread_detach)(
        !           369:                sf_object_t                     policy,
        !           370:                sched_thread_t          thread);
        !           371: 
        !           372:     /* Set the thread's processor [set] */
        !           373:     sf_return_t        (*sp_thread_processor)(
        !           374:                sf_object_t                     policy,
        !           375:                sched_thread_t          *thread,
        !           376:                processor_t                     processor);
        !           377: 
        !           378:     sf_return_t        (*sp_thread_processor_set)(
        !           379:                sf_object_t                     policy,
        !           380:                sched_thread_t          thread,
        !           381:                processor_set_t         processor_set);
        !           382: 
        !           383:     /* Set/get a thread's scheduling attributes */
        !           384:     sf_return_t        (*sp_thread_set)(
        !           385:                sf_object_t                     policy,
        !           386:                sched_thread_t          thread,
        !           387:                sp_attributes_t         policy_attributes);
        !           388: 
        !           389:     sf_return_t        (*sp_thread_get)(
        !           390:                sf_object_t                             policy,
        !           391:                sched_thread_t                  thread,
        !           392:                sp_attributes_t                 policy_attributes,
        !           393:                sp_attributes_size_t    size);
        !           394: 
        !           395:     /* Print scheduling info for a given thread */
        !           396:     int        (*sp_db_print_sched_stats)(
        !           397:                sf_object_t                     policy,
        !           398:                sched_thread_t          thread);
        !           399: 
        !           400:     /***
        !           401:      *** ??? Hopefully, many of the following operations are only
        !           402:      *** temporary.  Consequently, they haven't been forced to take
        !           403:      *** the same form as the others just yet.  That should happen
        !           404:      *** for all of those that end up being permanent additions to the
        !           405:      *** list of standard operations.
        !           406:      ***/
        !           407: 
        !           408:     /* `swtch_pri()' routine -- attempt to give up processor */
        !           409:     void (*sp_swtch_pri)(
        !           410:                sf_object_t                     policy,
        !           411:                int                                     pri);
        !           412: 
        !           413:     /* `thread_switch()' routine -- context switch w/ optional hint */
        !           414:     kern_return_t (*sp_thread_switch)(
        !           415:                sf_object_t                     policy,
        !           416:                thread_act_t            hint_act,
        !           417:                int                                     option,
        !           418:                mach_msg_timeout_t      option_time);
        !           419: 
        !           420:     /* `thread_depress_abort()' routine -- prematurely abort depression */
        !           421:     kern_return_t (*sp_thread_depress_abort)(
        !           422:                sf_object_t                     policy,
        !           423:                sched_thread_t          thread);
        !           424: 
        !           425:     /* `thread_depress_timeout()' routine -- timeout on depression */
        !           426:     void       (*sp_thread_depress_timeout)(
        !           427:                sf_object_t                     policy,
        !           428:                thread_t                        thread);
        !           429: 
        !           430:     /* `task_attach()' routine -- associate task with scheduling policy */
        !           431:     sf_return_t (*sp_task_attach)(
        !           432:                sf_object_t                     policy,
        !           433:                task_t                          task);
        !           434: 
        !           435:     /* `task_detach()' routine -- disassociate task from scheduling policy */
        !           436:     sf_return_t (*sp_task_detach)(
        !           437:                sf_object_t                     policy,
        !           438:                task_t                          task);
        !           439: 
        !           440:     /* `task_policy()' routine -- set scheduling policy and parameters */
        !           441:     kern_return_t (*sp_task_policy)(
        !           442:                sf_object_t                             policy,
        !           443:                task_t                                  task,
        !           444:                policy_t                                policy_id,
        !           445:                policy_base_t                   base,
        !           446:                mach_msg_type_number_t  count,
        !           447:                boolean_t                               set_limit,
        !           448:                boolean_t                               change,
        !           449:                policy_limit_t                  *limit_ptr,
        !           450:                int                                             *lc_ptr);
        !           451: 
        !           452:     /* `task_set_policy()' routine -- set scheduling policy and parameters */
        !           453:     kern_return_t (*sp_task_set_policy)(
        !           454:                sf_object_t                             policy,
        !           455:                task_t                                  task,
        !           456:                processor_set_t                 pset,
        !           457:                policy_t                                policy_id,
        !           458:                policy_base_t                   base,
        !           459:                mach_msg_type_number_t  base_count,
        !           460:                policy_limit_t                  limit,
        !           461:                mach_msg_type_number_t  limit_count,
        !           462:                boolean_t                               change);
        !           463: 
        !           464:     kern_return_t (*sp_task_set_sched)(
        !           465:                sf_object_t                             policy,
        !           466:                task_t                                  task,
        !           467:                policy_t                                policy_id,
        !           468:                sched_attr_t                    sched_attr,
        !           469:                mach_msg_type_number_t  sched_attrCnt,
        !           470:                boolean_t                               set_limit,
        !           471:                boolean_t                               change);
        !           472: 
        !           473:     kern_return_t (*sp_task_get_sched)(
        !           474:                sf_object_t                             policy,
        !           475:                task_t                                  task,
        !           476:                policy_t                                policy_id,
        !           477:                sched_attr_t                    sched_attr,
        !           478:                mach_msg_type_number_t  sched_attrCnt,
        !           479:                mach_msg_type_number_t  sched_attr_size);
        !           480: 
        !           481:     boolean_t (*sp_thread_runnable)(
        !           482:                sf_object_t                     policy,
        !           483:                sched_thread_t          thread);
        !           484: 
        !           485:     sf_return_t        (*sp_alarm_expired)(
        !           486:                sf_object_t                     policy,
        !           487:                long                            alarm_seqno,
        !           488:                kern_return_t           result,
        !           489:                int                                     alarm_type,
        !           490:                mach_timespec_t         wakeup_time,
        !           491:                void                            *alarm_data);
        !           492: 
        !           493: } sp_ops_t;
        !           494: 
        !           495: /**********
        !           496:  *
        !           497:  * Scheduling Policy
        !           498:  *
        !           499:  **********/
        !           500: 
        !           501: typedef struct sf_policy {
        !           502:        int                                     policy_id;                              /* policy number */
        !           503:        int                                     priority_mask_length;   /* length of a priority mask */
        !           504:        sf_priority_mask        priority_mask;                  /* mask for this policy */
        !           505: 
        !           506:        /***
        !           507:         *** ??? does this have to be so general?  why not just
        !           508:         *** have room in this struct for the priority mask?  then
        !           509:         *** there is no need for an allocation and less indirection
        !           510:         *** is required for normal access.
        !           511:         ***/
        !           512: 
        !           513:        /*
        !           514:         * This is the size of the scheduling parameters
        !           515:         * data structure for this scheduling policy, in
        !           516:         * bytes.
        !           517:         *
        !           518:         * These are the parameters that are actually
        !           519:         * communicated -- and meaningful -- outside
        !           520:         * the policy.  (This is as opposed to the
        !           521:         * internal state, which has some overlap with
        !           522:         * the scheduling parameters.  The size of the
        !           523:         * internal state is given by `sched_info_size'
        !           524:         * in this structure.)
        !           525:         *
        !           526:         * By convention, the first field in the sched
        !           527:         * parameters structure is the scheduling policy
        !           528:         * ID.  This makes the parameters more readily
        !           529:         * self-describing.
        !           530:         */
        !           531:        sp_attributes_size_t    sched_attributes_size;
        !           532: 
        !           533:        /*
        !           534:         * This is the size of the scheduling policy's
        !           535:         * internal state that describes the state of a
        !           536:         * thread, in bytes.
        !           537:         */
        !           538:        sp_info_size_t                  sched_info_size;
        !           539: 
        !           540:        /*
        !           541:         * policy-specific versions
        !           542:         * of standard sched ops
        !           543:         */
        !           544:        sp_ops_t                                sp_ops;
        !           545: } sched_policy_t;
        !           546: 
        !           547: #define SCHED_POLICY_NULL      ((sched_policy_t *) 0)
        !           548: 
        !           549: #define policy_id_to_sched_policy(policy_id)           \
        !           550:        (((policy_id) != POLICY_NULL)?                                  \
        !           551:                        &sched_policy[(policy_id)] : SCHED_POLICY_NULL)
        !           552: 
        !           553: /*
        !           554:  * Declaration for array of scheduling policies known to kernel
        !           555:  */
        !           556: extern sched_policy_t  sched_policy[MAX_SCHED_POLS];
        !           557: 
        !           558: /*
        !           559:  * Maximum sizes for scheduling-policy-specific information and 
        !           560:  * attributes, calculated dynamically based on the scheduling
        !           561:  * policies that were initialized at system startup time.
        !           562:  */
        !           563: extern sp_info_size_t          max_sched_info_size;
        !           564: extern         sp_attributes_size_t    max_sched_attributes_size;
        !           565: 
        !           566: #endif /* _KERN_SF_H_ */

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