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jeremybenn |
/*
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* (c) Copyright 1990-1996 OPEN SOFTWARE FOUNDATION, INC.
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* (c) Copyright 1990-1996 HEWLETT-PACKARD COMPANY
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* (c) Copyright 1990-1996 DIGITAL EQUIPMENT CORPORATION
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* (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems
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* To anyone who acknowledges that this file is provided "AS IS" without
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* any express or implied warranty: permission to use, copy, modify, and
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* distribute this file for any purpose is hereby granted without fee,
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* provided that the above copyright notices and this notice appears in
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* all source code copies, and that none of the names listed above be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. None of these organizations
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* makes any representations about the suitability of this software for
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* any purpose.
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*/
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/*
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* Header file for priority scheduling
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*/
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#ifndef CMA_SCHED
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#define CMA_SCHED
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/*
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* INCLUDE FILES
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*/
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/*
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* CONSTANTS AND MACROS
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*/
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/*
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* Scaling factor for integer priority calculations
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*/
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#define cma__c_prio_scale 8
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#if _CMA_VENDOR_ == _CMA__APOLLO
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/*
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* FIX-ME: Apollo cc 6.8 blows contant folded "<<" and ">>"
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*/
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# define cma__scale_up(exp) ((exp) * 256)
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# define cma__scale_dn(exp) ((exp) / 256)
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#else
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# define cma__scale_up(exp) ((exp) << cma__c_prio_scale)
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# define cma__scale_dn(exp) ((exp) >> cma__c_prio_scale)
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#endif
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/*
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* Min. num. of ticks between self-adjustments for priority adjusting policies.
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*/
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#define cma__c_prio_interval 10
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/*
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* Number of queues in each class of queues
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*/
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#define cma__c_prio_n_id 1 /* Very-low-priority class threads */
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#define cma__c_prio_n_bg 8 /* Background class threads */
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#define cma__c_prio_n_0 1 /* Very low priority throughput quartile */
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#define cma__c_prio_n_1 2 /* Low priority throughput quartile */
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#define cma__c_prio_n_2 3 /* Medium priority throughput quartile */
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#define cma__c_prio_n_3 4 /* High priority throughput quartile */
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#define cma__c_prio_n_rt 1 /* Real Time priority queues */
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/*
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* Number of queues to skip (offset) to get to the queues in this section of LA
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*/
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#define cma__c_prio_o_id 0
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#define cma__c_prio_o_bg cma__c_prio_o_id + cma__c_prio_n_id
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#define cma__c_prio_o_0 cma__c_prio_o_bg + cma__c_prio_n_bg
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#define cma__c_prio_o_1 cma__c_prio_o_0 + cma__c_prio_n_0
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#define cma__c_prio_o_2 cma__c_prio_o_1 + cma__c_prio_n_1
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#define cma__c_prio_o_3 cma__c_prio_o_2 + cma__c_prio_n_2
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#define cma__c_prio_o_rt cma__c_prio_o_3 + cma__c_prio_n_3
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/*
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* Ada_low: These threads are queued in the background queues, thus there
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* must be enough queues to allow one queue for each Ada priority below the
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* Ada default.
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*/
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#define cma__c_prio_o_al cma__c_prio_o_bg
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/*
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* Total number of ready queues, for declaration purposes
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*/
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#define cma__c_prio_n_tot \
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cma__c_prio_n_id + cma__c_prio_n_bg + cma__c_prio_n_rt \
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+ cma__c_prio_n_0 + cma__c_prio_n_1 + cma__c_prio_n_2 + cma__c_prio_n_3
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/*
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* Formulae for determining a thread's priority. Variable priorities (such
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* as foreground and background) are scaled values.
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*/
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#define cma__sched_priority(tcb) \
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((tcb)->sched.class == cma__c_class_fore ? cma__sched_prio_fore (tcb) \
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:((tcb)->sched.class == cma__c_class_back ? cma__sched_prio_back (tcb) \
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:((tcb)->sched.class == cma__c_class_rt ? cma__sched_prio_rt (tcb) \
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:((tcb)->sched.class == cma__c_class_idle ? cma__sched_prio_idle (tcb) \
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:(cma__bugcheck ("cma__sched_priority: unrecognized class"), 0) ))))
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#define cma__sched_prio_fore(tcb) cma__sched_prio_fore_var (tcb)
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#define cma__sched_prio_back(tcb) ((tcb)->sched.fixed_prio \
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? cma__sched_prio_back_fix (tcb) : cma__sched_prio_back_var (tcb) )
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#define cma__sched_prio_rt(tcb) ((tcb)->sched.priority)
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#define cma__sched_prio_idle(tcb) ((tcb)->sched.priority)
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#define cma__sched_prio_back_fix(tcb) \
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(cma__g_prio_bg_min + (cma__g_prio_bg_max - cma__g_prio_bg_min) \
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* ((tcb)->sched.priority + cma__c_prio_o_al - cma__c_prio_o_bg) \
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/ cma__c_prio_n_bg)
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/*
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* FIX-ME: Enable after modeling (if we like it)
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*/
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#if 1
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# define cma__sched_prio_fore_var(tcb) \
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((cma__g_prio_fg_max + cma__g_prio_fg_min)/2)
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# define cma__sched_prio_back_var(tcb) \
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((cma__g_prio_bg_max + cma__g_prio_bg_min)/2)
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#else
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# define cma__sched_prio_back_var(tcb) cma__sched_prio_fore_var (tcb)
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# if 1
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/*
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* Re-scale, since the division removes the scale factor.
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* Scale and multiply before dividing to avoid loss of precision.
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*/
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# define cma__sched_prio_fore_var(tcb) \
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((cma__g_vp_count * cma__scale_up((tcb)->sched.tot_time)) \
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/ (tcb)->sched.cpu_time)
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# else
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/*
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* Re-scale, since the division removes the scale factor.
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* Scale and multiply before dividing to avoid loss of precision.
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* Left shift the numerator to multiply by two.
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*/
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# define cma__sched_prio_fore_var(tcb) \
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(((cma__g_vp_count * cma__scale_up((tcb)->sched.tot_time) \
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* (tcb)->sched.priority * cma__g_init_frac_sum) << 1) \
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/ ((tcb)->sched.cpu_time * (tcb)->sched.priority * cma__g_init_frac_sum \
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+ (tcb)->sched.tot_time))
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# endif
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#endif
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/*
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* Update weighted-averaged, scaled tick counters
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*/
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#define cma__sched_update_time(ave, new) \
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(ave) = (ave) - ((cma__scale_dn((ave)) - (new)) << (cma__c_prio_scale - 4))
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#define cma__sched_parameterize(tcb, policy) { \
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switch (policy) { \
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case cma_c_sched_fifo : { \
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(tcb)->sched.rtb = cma_c_true; \
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(tcb)->sched.spp = cma_c_true; \
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(tcb)->sched.fixed_prio = cma_c_true; \
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(tcb)->sched.class = cma__c_class_rt; \
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break; \
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} \
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case cma_c_sched_rr : { \
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(tcb)->sched.rtb = cma_c_false; \
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(tcb)->sched.spp = cma_c_true; \
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(tcb)->sched.fixed_prio = cma_c_true; \
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(tcb)->sched.class = cma__c_class_rt; \
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break; \
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} \
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case cma_c_sched_throughput : { \
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(tcb)->sched.rtb = cma_c_false; \
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(tcb)->sched.spp = cma_c_false; \
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(tcb)->sched.fixed_prio = cma_c_false; \
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(tcb)->sched.class = cma__c_class_fore; \
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break; \
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} \
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case cma_c_sched_background : { \
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(tcb)->sched.rtb = cma_c_false; \
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(tcb)->sched.spp = cma_c_false; \
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(tcb)->sched.fixed_prio = cma_c_false; \
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(tcb)->sched.class = cma__c_class_back; \
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break; \
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} \
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case cma_c_sched_ada_low : { \
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(tcb)->sched.rtb = cma_c_false; \
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(tcb)->sched.spp = cma_c_true; \
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(tcb)->sched.fixed_prio = cma_c_true; \
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(tcb)->sched.class = cma__c_class_back; \
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break; \
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} \
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case cma_c_sched_idle : { \
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(tcb)->sched.rtb = cma_c_false; \
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(tcb)->sched.spp = cma_c_false; \
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(tcb)->sched.fixed_prio = cma_c_false; \
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(tcb)->sched.class = cma__c_class_idle; \
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break; \
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} \
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default : { \
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cma__bugcheck ("cma__sched_parameterize: bad scheduling Policy"); \
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break; \
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} \
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} \
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}
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/*
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* TYPEDEFS
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*/
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/*
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* Scheduling classes
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*/
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typedef enum CMA__T_SCHED_CLASS {
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cma__c_class_rt,
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cma__c_class_fore,
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cma__c_class_back,
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cma__c_class_idle
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} cma__t_sched_class;
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/*
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* GLOBAL DATA
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*/
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/*
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* Minimuma and maximum prioirities, for foreground and background threads,
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* as of the last time the scheduler ran. (Scaled once.)
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*/
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extern cma_t_integer cma__g_prio_fg_min;
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extern cma_t_integer cma__g_prio_fg_max;
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extern cma_t_integer cma__g_prio_bg_min;
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extern cma_t_integer cma__g_prio_bg_max;
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/*
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* The "m" values are the slopes of the four sections of linear approximation.
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*
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* cma__g_prio_m_I = 4*N(I)/cma__g_prio_range (Scaled once.)
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*/
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extern cma_t_integer cma__g_prio_m_0,
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cma__g_prio_m_1,
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cma__g_prio_m_2,
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cma__g_prio_m_3;
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/*
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* The "b" values are the intercepts of the four sections of linear approx.
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* (Not scaled.)
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*
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* cma__g_prio_b_I = -N(I)*(I*prio_max + (4-I)*prio_min)/prio_range + prio_o_I
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*/
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extern cma_t_integer cma__g_prio_b_0,
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cma__g_prio_b_1,
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cma__g_prio_b_2,
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cma__g_prio_b_3;
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/*
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* The "p" values are the end points of the four sections of linear approx.
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*
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* cma__g_prio_p_I = cma__g_prio_fg_min + (I/4)*cma__g_prio_range
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*
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* [cma__g_prio_p_0 is not defined since it is not used (also, it is the same
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* as cma__g_prio_fg_min).] (Scaled once.)
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*/
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extern cma_t_integer cma__g_prio_p_1,
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cma__g_prio_p_2,
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cma__g_prio_p_3;
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/*
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* Points to the next queue for the dispatcher to check for ready threads.
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*/
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extern cma_t_integer cma__g_next_ready_queue;
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/*
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* Points to the queues of virtual processors (for preempt victim search)
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*/
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extern cma__t_queue cma__g_run_vps;
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extern cma__t_queue cma__g_susp_vps;
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extern cma_t_integer cma__g_vp_count;
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/*
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* INTERNAL INTERFACES
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*/
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#endif
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