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comparison packages/kernel/current/cdl/scheduler.cdl @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 6736c52df507
children 0ae0bc38e387
comparison
equal deleted inserted replaced
114:5ad2b71d525e 115:6ed91473a1cd
120 calculated {"CYGNUM_KERNEL_SCHED_PRIORITIES"} 120 calculated {"CYGNUM_KERNEL_SCHED_PRIORITIES"}
121 description " 121 description "
122 This option automatically defines the size of bitmap 122 This option automatically defines the size of bitmap
123 used to track occupied priority levels." 123 used to track occupied priority levels."
124 } 124 }
125 } 125
126 126
127 cdl_option CYGIMP_KERNEL_SCHED_SORTED_QUEUES {
128 display "Dequeue oldest threads first"
129 flavor bool
130 default_value 0
131 description "
132 With this option enabled, threads queued in a thread queue
133 will be dequeued in priority order, rather than last in,
134 first out (LIFO). Threads of equal priority are dequeued
135 oldest first. The only exception is the scheduler run
136 queues where order is less important as each is already
137 sorted by priority. Note that this makes the thread queueing
138 less deterministic."
139 }
140 }
141
142 # ---------------------------------------------------------------------
143 # Timeslice options
127 144
128 # NOTE: this option only makes sense for some of the schedulers. 145 # NOTE: this option only makes sense for some of the schedulers.
129 # Timeslicing is irrelevant for bitmap schedulers. 146 # Timeslicing is irrelevant for bitmap schedulers.
130 cdl_component CYGSEM_KERNEL_SCHED_TIMESLICE { 147 cdl_component CYGSEM_KERNEL_SCHED_TIMESLICE {
131 display "Scheduler timeslicing" 148 display "Scheduler timeslicing"
153 take place? The value of this option corresponds to the 170 take place? The value of this option corresponds to the
154 number of clock ticks that should occur before a timeslice 171 number of clock ticks that should occur before a timeslice
155 takes place, so increasing the value reduces the frequency 172 takes place, so increasing the value reduces the frequency
156 of timeslices." 173 of timeslices."
157 } 174 }
158 } 175
176 cdl_option CYGSEM_KERNEL_SCHED_TIMESLICE_ENABLE {
177 display "Support runtime enable of timeslice per-thread"
178 flavor bool
179 default_value false
180 description "This option makes timslicing a per-thread runtime
181 option. When enabled, threads may have timeslicing
182 turned on or off dynamically. This is generally used
183 by higher level APIs (such as POSIX) to implement
184 differing scheduling policies."
185
186 }
187 }
188
189 # ---------------------------------------------------------------------
190 # ASR support options
191
192 cdl_component CYGSEM_KERNEL_SCHED_ASR_SUPPORT {
193 display "Enable ASR support"
194 flavor bool
195 default_value false
196 description "
197 This component controls support for Asynchronous Service
198 Routines (ASRs). This is a function that may be called
199 from the scheduler when it has just exited the scheduler
200 lock. This is primarily for use by API compatibility layers."
201
202 cdl_option CYGSEM_KERNEL_SCHED_ASR_GLOBAL {
203 display "Make ASR function global"
204 flavor bool
205 default_value true
206 description "
207 This option controls whether the ASR function is shared by
208 all threads, or whether each thread may have its own ASR
209 function."
210 }
211
212 cdl_option CYGSEM_KERNEL_SCHED_ASR_DATA_GLOBAL {
213 display "Make ASR data global"
214 flavor bool
215 default_value true
216 description "
217 This option controls whether the ASR data is shared by
218 all threads, or whether each thread may have its own ASR
219 data. This is independent of the previous option because
220 it may be useful to pass per-thread data to a shared ASR
221 function."
222 }
223 }
224