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annotate packages/kernel/current/cdl/thread.cdl @ 132:0ae0bc38e387 ecos-sw-2000-10-31

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Merge from eCos master repository on 2000-10-31-00:30:36-GMT
author jlarmour
date Tue, 31 Oct 2000 20:53:09 +0000
parents 6ed91473a1cd
children 6b5f480c6929
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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 # thread.cdl
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4 #
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5 # configuration data related to the kernel threads
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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
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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
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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 cdl_option CYGFUN_KERNEL_THREADS_TIMER {
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44 display "Allow per-thread timers"
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45 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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46 default_value 1
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47 description "
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48 This option controls whether or not the kernel should support
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49 per-thread clock and alarm related functions. Also some of
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50 the synchronization primitives such as semaphore and
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51 condition variable timed wait operations require per-thread
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52 timer support. If none of these facilities are required then
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53 the option can be disabled."
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54 }
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55
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56 cdl_option CYGVAR_KERNEL_THREADS_NAME {
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57 display "Support optional name for each thread"
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58 default_value 1
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59 description "
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60 Threads may optionally be supplied with a name string that is
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61 used to identify them during debugging. This name is only
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62 present if `this option is defined. Disabling it reduces both
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63 code and data size."
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64 }
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65
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66 cdl_option CYGVAR_KERNEL_THREADS_LIST {
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67 display "Keep track of all threads using a linked list"
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68 default_value 1
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69 description "
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70 Threads may optionally be placed on a housekeeping list so
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71 that all threads may be located easily. This is useful mainly
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72 in conjunction with source-level debugging."
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73 }
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74
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75 cdl_option CYGFUN_KERNEL_THREADS_STACK_LIMIT {
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76 display "Keep track of the base of each thread's stack"
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77 default_value 1
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78 description "
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79 This option makes the kernel keep track of the lower limit on
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80 each thread's stack. It allows the kernel to adjust the lower
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81 limit, thus making space for per-thread data. Note that it
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82 does not imply any form of run-time stack overflow checking."
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83 }
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84
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85 cdl_component CYGVAR_KERNEL_THREADS_DATA {
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86 display "Support for per-thread data"
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87 requires CYGFUN_KERNEL_THREADS_STACK_LIMIT
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88 default_value 1
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89 description "
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90 It is possible for the kernel to support per-thread data, in
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91 other words an area of memory specific to each thread which
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92 can be used to store data for that thread. This per-thread
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93 data can be used by applications or by other packages such as
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94 the ISO C library."
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95
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96 cdl_option CYGNUM_KERNEL_THREADS_DATA_MAX {
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97 display "Number of words of per-thread data"
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98 flavor data
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99 legal_values 4 to 65535
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100 default_value 6
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101 description "
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102 It is possible for the kernel to support per-thread data, in
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103 other words an area of memory specific to each thread which
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104 can be used to store data for that thread. This per-thread
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105 data can be used by applications or by other packages such as
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106 the ISO C library. This configuration option controls the
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107 number of words of per-thread data that the kernel will
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108 allow."
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109 }
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110
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111 cdl_component CYGNUM_KERNEL_THREADS_DATA_ALL {
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112 display "Bitmap of preallocated slots of thread data"
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113 flavor data
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114 calculated 15
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115 description "
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116 Per thread data options. Per thread data support is based loosely
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117 on that defined by POSIX. Each thread has an array of slots, up to
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118 CYGNUM_KERNEL_THREADS_DATA_MAX, that may contain data. Some of the
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119 slots have been preallocated to specific packages. Others may be
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120 allocated dynamically."
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121
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122 cdl_option CYGNUM_KERNEL_THREADS_DATA_KERNEL {
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123 display "Slot 0 preallocated for the kernel"
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124 flavor data
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125 calculated 0
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126 description "
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127 This option defines the index of a per-thread data
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128 slot which is reserved by
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129 the eCos kernel
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130 for private use."
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131 }
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132 cdl_option CYGNUM_KERNEL_THREADS_DATA_ITRON {
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133 display "Slot 1 preallocated for uITRON"
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134 flavor data
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135 calculated 1
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136 description "
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137 This option defines the index of a per-thread data
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138 slot which is reserved by
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139 the uITRON compatibility layer
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140 for private use."
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141 }
115
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142 cdl_option CYGNUM_KERNEL_THREADS_DATA_ERRNO {
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143 display "Slot 2 preallocated for errno"
76
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144 flavor data
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145 calculated 2
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146 description "
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147 This option defines the index of a per-thread data
115
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148 slot which is reserved for use by an errno variable."
76
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149 }
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150 cdl_option CYGNUM_KERNEL_THREADS_DATA_POSIX {
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151 display "Slot 3 preallocated for POSIX"
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152 flavor data
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153 calculated 3
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154 description "
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155 This option defines the index of a per-thread data
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156 slot which is reserved by
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157 POSIX
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158 for private use."
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159 }
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160 }
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161 }
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162
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163 cdl_option CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE {
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164 display "Stack size for the idle thread"
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165 flavor data
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166 legal_values 512 to 65536
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167 default_value 2048
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168 description "
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169 This configuration option specifies the stack size in bytes
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170 for the idle thread. Unless the HAL is configured to use a
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171 separate interrupt stack this size must be sufficient to meet
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172 the requirements of all interrupt handlers - these
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173 requirements are cumulative if nested interrupted are
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174 enabled. Depending on the target architecture, the stack size
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175 typically has to be a multiple of eight or sixteen bytes.
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176 This will be overridden where it is used if the
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177 architectural HAL requires a minimum stack size
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178 to handle interrupts correctly."
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179 }
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180
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181 # ---------------------------------------------------------------------
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182 # Thread-related miscellania.
115
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183
76
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184 cdl_option CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT {
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185 display "Maximal suspend count"
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186 flavor data
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187 default_value 500
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188 description "
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189 This option provides for an assertion that the count value for
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190 counted thread suspends do not exceed set limits. This is to help
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191 with debugging, to allow a runaaway loop, for example, to be
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192 detected more easily.
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193
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194 If the option is not defined, no assert is included. Whether asserts
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195 are themselves included depends on infrastructure configury in
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196 infra.h"
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197 }
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198
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199 cdl_option CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT {
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200 display "Maximal wake count"
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201 flavor data
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202 default_value 500
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203 description "
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204 This option provides for an assertion that the count value for
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205 counted thread wakeups do not exceed set limits. This is to
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206 help with debugging, to allow a runaaway loop, for example, to
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207 be detected more easily.
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208
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209 If the option is not defined, no assert is included. Whether asserts
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210 are themselves included depends on infrastructure configury in
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211 infra.h"
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212 }
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213
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214
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215 #if CYGNUM_KERNEL_SCHED_PRIORITIES == 1
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216 # define CYGIMP_IDLE_THREAD_YIELD
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217 #endif
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218 cdl_option CYGIMP_IDLE_THREAD_YIELD {
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219 display "Idle thread must always yield"
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220 calculated 1
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221 active_if (CYGNUM_KERNEL_SCHED_PRIORITIES == 1)
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222 description "
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223 If the scheduler configuration only has a single priority
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224 level, then the idle thread must yield each time around its loop."
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225 }