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annotate packages/kernel/current/cdl/synch.cdl @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
parents
children 6ed91473a1cd
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 # ====================================================================
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2 #
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3 # synch.cdl
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4 #
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5 # configuration data related to the kernel synchronization primitives
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6 #
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7 # ====================================================================
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8 #####COPYRIGHTBEGIN####
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9 #
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10 # -------------------------------------------
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11 # The contents of this file are subject to the Red Hat eCos Public License
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12 # Version 1.1 (the "License"); you may not use this file except in
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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13 # compliance with the License. You may obtain a copy of the License at
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14 # http://www.redhat.com/
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15 #
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16 # Software distributed under the License is distributed on an "AS IS"
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17 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 # License for the specific language governing rights and limitations under
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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19 # the License.
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20 #
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21 # The Original Code is eCos - Embedded Configurable Operating System,
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22 # released September 30, 1998.
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23 #
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24 # The Initial Developer of the Original Code is Red Hat.
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25 # Portions created by Red Hat are
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26 # Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 # All Rights Reserved.
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28 # -------------------------------------------
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29 #
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30 #####COPYRIGHTEND####
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31 # ====================================================================
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32 ######DESCRIPTIONBEGIN####
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33 #
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34 # Author(s): jskov
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35 # Original data: nickg
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36 # Contributors:
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37 # Date: 1999-07-05
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38 #
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39 #####DESCRIPTIONEND####
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40 #
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41 # ====================================================================
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42
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43 # NOTE: the requires statement is only valid for the current kernel.
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44 # Priority inheritance is possible in other schedulers as well
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45 # but is not yet implemented.
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46 cdl_option CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE {
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47 display "Simple mutex priority inheritance"
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48 requires CYGSEM_KERNEL_SCHED_MLQUEUE
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49 default_value 1
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50 description "
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51 This option enables a relatively simple implementation of
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52 mutex priority inheritance. The implementation will only work
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53 in the mlqueue scheduler, and it does not handle the rare
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54 case of nested mutexes completely correctly. However it is
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55 both fast and deterministic. Mutex priority inheritance can
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56 be disabled if the application does not require it, which
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57 will reduce both code size and data space."
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58 }
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59
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60 cdl_option CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE_RELAY {
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61 display "Relay enhancement to simple mutex priority inheritance"
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62 active_if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE
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63 default_value 1
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64 description "
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65 This option enables an extension to the simple implementation of
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66 mutex priority inheritance whereby a thread releasing a mutex to a
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67 waiting thread relays its own priority to the new owner if there
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68 are still further threads waiting. This can be viewed as a
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69 discovered priority ceiling."
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70 }
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71
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72 cdl_option CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT {
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73 display "Message box blocking put support"
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74 default_value 1
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75 description "
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76 Message boxes can support three different versions of the
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77 put-message operation. The first is tryput(), which will fail
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78 if the message box is already full. The other two are the
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79 ordinary put() function which will block if the message box
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80 is full, and a timed put() operation which will block for
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81 upto a certain length of time if the message box is currently
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82 full. The blocking versions require extra memory in the
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83 message box data structure and extra code in the other
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84 message box functions, so they can be disabled if the
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85 application does not require them. If this option is enabled
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86 then the system will always provide the blocking put()
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87 function, and it will also provide the timed put() function
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88 if thread timers are enabled."
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89 }
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90
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91 cdl_option CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE {
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92 display "Message box queue size"
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93 flavor data
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94 legal_values 1 to 65535
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95 default_value 10
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96 description "
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97 This configuration option controls the number of messages
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98 that can be queued in a message box before a non-blocking
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99 put() operation will fail or a blocking put() operation will
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100 block. The cost in memory is one pointer per message box for
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101 each possible message."
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102 }
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103
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104 cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {
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105 display "Condition variable timed-wait support"
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106 requires CYGFUN_KERNEL_THREADS_TIMER
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107 default_value 1
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108 description "
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109 This option enables the condition variable timed wait
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110 facility."
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111 }