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Merge from eCos master repository on 2001-01-05-06:43:02-GMT
author jlarmour
date Fri, 05 Jan 2001 17:12:36 +0000
parents 2e9a636d9de9
children f62680ef1804
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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 CYGFUN_KERNEL_THREADS_STACK_CHECKING {
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86 display "Check thread stacks for overflows"
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87 active_if CYGPKG_INFRA_DEBUG
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88 active_if CYGDBG_USE_ASSERTS
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89 default_value 1
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90 description "
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91 This option enables a variety of checks for stack overflow
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92 including signatures at the top and base of thread stacks,
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93 which are asserted for correctness whenever a thread switches."
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94
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95 cdl_option CYGFUN_KERNEL_ALL_THREADS_STACK_CHECKING {
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96 display "Check all threads whenever possible"
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97 requires CYGVAR_KERNEL_THREADS_LIST
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98 default_value 0
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99 description "
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100 This option enables more active checking of all threads for
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101 wrongdoing. In theory, checking threads other than the old and new
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102 executing threads in a thread-switch is pointless, because no other
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103 thread has run, so no other stack can be exceeded. But errors such
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104 as memory scribbling, dangling pointers, overlapping use of store
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105 or errors accessing objects adjacent to a stack which can be very
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106 hard to find can be detected this way, saving debug time."
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107 }
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108
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109 cdl_option CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE {
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110 display "Signature size in bytes, at stack top and bottom"
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111 flavor data
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112 default_value 32
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113 legal_values 8 to 512
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114 description "
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115 This is the size of the area reserved for a signature at the top
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116 and bottom of all stacks. It also provides a buffer zone for
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117 detecting overflow before external objects are corrupted, hence the
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118 ability to vary it here. But if you are short of stack, increasing
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119 this value will make the overflow more, not less likely, of course."
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120 }
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121 }
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122
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123 cdl_component CYGFUN_KERNEL_THREADS_STACK_MEASUREMENT {
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124 display "Measure stack usage"
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125 default_value { 0 != CYGPKG_INFRA_DEBUG }
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126 description "
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127 This option allows measurement of each thread's stack by initializing
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128 it to a predefined value at thread creation time. Later use of the
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129 cyg_thread_measure_stack_usage() function allows the maximum stack
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130 usage of the thread so far to be obtained. Note that this is not
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131 necessarily the true maximum stack usage that the thread will ever
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132 use since all that has been measured is the stack usage corresponding
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133 to the code path followed this time, and not the code path that may
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134 be followed in future."
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135
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136 cdl_option CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT {
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137 display "Output stack usage on thread exit"
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138 default_value 0
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139 description "
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140 This will output the measured stack usage on the diagnostic
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141 output when a thread exits."
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142 }
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143 }
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144
76
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145 cdl_component CYGVAR_KERNEL_THREADS_DATA {
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146 display "Support for per-thread data"
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147 requires CYGFUN_KERNEL_THREADS_STACK_LIMIT
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148 default_value 1
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149 description "
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150 It is possible for the kernel to support per-thread data, in
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151 other words an area of memory specific to each thread which
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152 can be used to store data for that thread. This per-thread
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153 data can be used by applications or by other packages such as
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154 the ISO C library."
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155
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156 cdl_option CYGNUM_KERNEL_THREADS_DATA_MAX {
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157 display "Number of words of per-thread data"
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158 flavor data
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159 legal_values 4 to 65535
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160 default_value 6
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161 description "
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162 It is possible for the kernel to support per-thread data, in
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163 other words an area of memory specific to each thread which
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164 can be used to store data for that thread. This per-thread
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165 data can be used by applications or by other packages such as
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166 the ISO C library. This configuration option controls the
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167 number of words of per-thread data that the kernel will
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168 allow."
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169 }
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170
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171 cdl_component CYGNUM_KERNEL_THREADS_DATA_ALL {
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172 display "Bitmap of preallocated slots of thread data"
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173 flavor data
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174 calculated 15
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175 description "
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176 Per thread data options. Per thread data support is based loosely
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177 on that defined by POSIX. Each thread has an array of slots, up to
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178 CYGNUM_KERNEL_THREADS_DATA_MAX, that may contain data. Some of the
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179 slots have been preallocated to specific packages. Others may be
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180 allocated dynamically."
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181
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182 cdl_option CYGNUM_KERNEL_THREADS_DATA_KERNEL {
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183 display "Slot 0 preallocated for the kernel"
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184 flavor data
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185 calculated 0
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186 description "
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187 This option defines the index of a per-thread data
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188 slot which is reserved by
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189 the eCos kernel
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190 for private use."
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191 }
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192 cdl_option CYGNUM_KERNEL_THREADS_DATA_ITRON {
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193 display "Slot 1 preallocated for uITRON"
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194 flavor data
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195 calculated 1
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196 description "
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197 This option defines the index of a per-thread data
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198 slot which is reserved by
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199 the uITRON compatibility layer
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200 for private use."
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201 }
115
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202 cdl_option CYGNUM_KERNEL_THREADS_DATA_ERRNO {
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203 display "Slot 2 preallocated for errno"
76
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204 flavor data
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205 calculated 2
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206 description "
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207 This option defines the index of a per-thread data
115
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208 slot which is reserved for use by an errno variable."
76
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209 }
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210 cdl_option CYGNUM_KERNEL_THREADS_DATA_POSIX {
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211 display "Slot 3 preallocated for POSIX"
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212 flavor data
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213 calculated 3
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214 description "
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215 This option defines the index of a per-thread data
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216 slot which is reserved by
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217 POSIX
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218 for private use."
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219 }
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220 }
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221 }
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222
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223 cdl_option CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE {
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224 display "Stack size for the idle thread"
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225 flavor data
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226 legal_values 512 to 65536
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227 default_value 2048
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228 description "
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229 This configuration option specifies the stack size in bytes
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230 for the idle thread. Unless the HAL is configured to use a
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231 separate interrupt stack this size must be sufficient to meet
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232 the requirements of all interrupt handlers - these
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233 requirements are cumulative if nested interrupted are
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234 enabled. Depending on the target architecture, the stack size
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235 typically has to be a multiple of eight or sixteen bytes.
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236 This will be overridden where it is used if the
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237 architectural HAL requires a minimum stack size
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238 to handle interrupts correctly."
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239 }
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240
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241 # ---------------------------------------------------------------------
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242 # Thread-related miscellania.
115
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243
76
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244 cdl_option CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT {
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245 display "Maximal suspend count"
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246 flavor data
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247 default_value 500
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248 description "
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249 This option provides for an assertion that the count value for
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250 counted thread suspends do not exceed set limits. This is to help
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251 with debugging, to allow a runaaway loop, for example, to be
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252 detected more easily.
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253
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254 If the option is not defined, no assert is included. Whether asserts
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255 are themselves included depends on infrastructure configury in
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256 infra.h"
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257 }
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258
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259 cdl_option CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT {
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260 display "Maximal wake count"
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261 flavor data
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262 default_value 500
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263 description "
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264 This option provides for an assertion that the count value for
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265 counted thread wakeups do not exceed set limits. This is to
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266 help with debugging, to allow a runaaway loop, for example, to
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267 be detected more easily.
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268
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269 If the option is not defined, no assert is included. Whether asserts
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270 are themselves included depends on infrastructure configury in
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271 infra.h"
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272 }
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273
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274
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275 #if CYGNUM_KERNEL_SCHED_PRIORITIES == 1
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276 # define CYGIMP_IDLE_THREAD_YIELD
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277 #endif
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278 cdl_option CYGIMP_IDLE_THREAD_YIELD {
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279 display "Idle thread must always yield"
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280 calculated 1
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281 active_if (CYGNUM_KERNEL_SCHED_PRIORITIES == 1)
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282 description "
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283 If the scheduler configuration only has a single priority
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284 level, then the idle thread must yield each time around its loop."
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285 }
143
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286