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annotate packages/kernel/current/cdl/thread.cdl @ 549:7002f6e48db9

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* src/common/thread.cxx: Fix potential warning and overflow with CYGNUM_KERNEL_THREADS_DATA_MAX == 32.
author jlarmour
date Thu, 30 Jan 2003 07:02:53 +0000
parents 70b861ba8f8c
children 8db735631ddb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 # ====================================================================
208
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8 #####ECOSGPLCOPYRIGHTBEGIN####
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9 ## -------------------------------------------
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10 ## This file is part of eCos, the Embedded Configurable Operating System.
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11 ## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 ##
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13 ## eCos is free software; you can redistribute it and/or modify it under
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14 ## the terms of the GNU General Public License as published by the Free
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15 ## Software Foundation; either version 2 or (at your option) any later version.
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16 ##
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17 ## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 ## WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 ## for more details.
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21 ##
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22 ## You should have received a copy of the GNU General Public License along
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23 ## with eCos; if not, write to the Free Software Foundation, Inc.,
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24 ## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ##
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26 ## As a special exception, if other files instantiate templates or use macros
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27 ## or inline functions from this file, or you compile this file and link it
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28 ## with other works to produce a work based on this file, this file does not
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29 ## by itself cause the resulting work to be covered by the GNU General Public
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30 ## License. However the source code for this file must still be made available
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31 ## in accordance with section (3) of the GNU General Public License.
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32 ##
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33 ## This exception does not invalidate any other reasons why a work based on
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34 ## this file might be covered by the GNU General Public License.
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35 ##
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36 ## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 ## at http://sources.redhat.com/ecos/ecos-license/
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38 ## -------------------------------------------
208
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39 #####ECOSGPLCOPYRIGHTEND####
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40 # ====================================================================
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41 ######DESCRIPTIONBEGIN####
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42 #
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43 # Author(s): jskov
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44 # Original data: nickg
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45 # Contributors:
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46 # Date: 1999-07-05
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47 #
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48 #####DESCRIPTIONEND####
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49 #
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50 # ====================================================================
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51
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52 cdl_option CYGFUN_KERNEL_THREADS_TIMER {
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53 display "Allow per-thread timers"
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54 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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55 default_value 1
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56 description "
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57 This option controls whether or not the kernel should support
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58 per-thread clock and alarm related functions. Also some of
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59 the synchronization primitives such as semaphore and
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60 condition variable timed wait operations require per-thread
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61 timer support. If none of these facilities are required then
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62 the option can be disabled."
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63 }
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64
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65 cdl_option CYGVAR_KERNEL_THREADS_NAME {
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66 display "Support optional name for each thread"
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67 default_value 1
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68 description "
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69 Threads may optionally be supplied with a name string that is
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70 used to identify them during debugging. This name is only
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71 present if `this option is defined. Disabling it reduces both
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72 code and data size."
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73 }
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74
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75 cdl_option CYGVAR_KERNEL_THREADS_LIST {
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76 display "Keep track of all threads using a linked list"
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77 default_value 1
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78 description "
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79 Threads may optionally be placed on a housekeeping list so
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80 that all threads may be located easily. This is useful mainly
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81 in conjunction with source-level debugging."
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82 }
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83
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84 cdl_option CYGFUN_KERNEL_THREADS_STACK_LIMIT {
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85 display "Keep track of the base of each thread's stack"
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86 default_value 1
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87 description "
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88 This option makes the kernel keep track of the lower limit on
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89 each thread's stack. It allows the kernel to adjust the lower
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90 limit, thus making space for per-thread data. Note that it
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91 does not imply any form of run-time stack overflow checking."
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92 }
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93
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94 cdl_component CYGFUN_KERNEL_THREADS_STACK_CHECKING {
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95 display "Check thread stacks for overflows"
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96 active_if CYGPKG_INFRA_DEBUG
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97 active_if CYGDBG_USE_ASSERTS
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98 default_value 1
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99 description "
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100 This option enables a variety of checks for stack overflow
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101 including signatures at the top and base of thread stacks,
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102 which are asserted for correctness whenever a thread switches."
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103
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104 cdl_option CYGFUN_KERNEL_ALL_THREADS_STACK_CHECKING {
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105 display "Check all threads whenever possible"
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106 requires CYGVAR_KERNEL_THREADS_LIST
143
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107 default_value 0
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108 description "
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109 This option enables more active checking of all threads for
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110 wrongdoing. In theory, checking threads other than the old and new
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111 executing threads in a thread-switch is pointless, because no other
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112 thread has run, so no other stack can be exceeded. But errors such
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113 as memory scribbling, dangling pointers, overlapping use of store
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114 or errors accessing objects adjacent to a stack which can be very
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115 hard to find can be detected this way, saving debug time."
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116 }
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117
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118 cdl_option CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE {
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119 display "Signature size in bytes, at stack top and bottom"
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120 flavor data
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121 default_value 32
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122 legal_values 8 to 512
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123 description "
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124 This is the size of the area reserved for a signature at the top
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125 and bottom of all stacks. It also provides a buffer zone for
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126 detecting overflow before external objects are corrupted, hence the
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127 ability to vary it here. But if you are short of stack, increasing
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128 this value will make the overflow more, not less likely, of course."
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129 }
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130 }
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132 cdl_component CYGFUN_KERNEL_THREADS_STACK_MEASUREMENT {
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133 display "Measure stack usage"
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134 default_value { 0 != CYGPKG_INFRA_DEBUG }
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135 description "
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136 This option allows measurement of each thread's stack by initializing
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137 it to a predefined value at thread creation time. Later use of the
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138 cyg_thread_measure_stack_usage() function allows the maximum stack
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139 usage of the thread so far to be obtained. Note that this is not
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140 necessarily the true maximum stack usage that the thread will ever
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141 use since all that has been measured is the stack usage corresponding
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142 to the code path followed this time, and not the code path that may
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143 be followed in future."
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144
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145 cdl_option CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT {
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146 display "Output stack usage on thread exit"
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147 default_value 0
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148 description "
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149 This will output the measured stack usage on the diagnostic
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150 output when a thread exits."
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151 }
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152 }
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153
76
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154 cdl_component CYGVAR_KERNEL_THREADS_DATA {
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155 display "Support for per-thread data"
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156 requires CYGFUN_KERNEL_THREADS_STACK_LIMIT
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157 default_value 1
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158 description "
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159 It is possible for the kernel to support per-thread data, in
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160 other words an area of memory specific to each thread which
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161 can be used to store data for that thread. This per-thread
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162 data can be used by applications or by other packages such as
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163 the ISO C library."
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164
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165 cdl_option CYGNUM_KERNEL_THREADS_DATA_MAX {
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166 display "Number of words of per-thread data"
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167 flavor data
549
7002f6e48db9 * src/common/thread.cxx: Fix potential warning and overflow with
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168 legal_values 4 to 32
76
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169 default_value 6
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170 description "
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171 It is possible for the kernel to support per-thread data, in
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172 other words an area of memory specific to each thread which
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173 can be used to store data for that thread. This per-thread
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174 data can be used by applications or by other packages such as
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175 the ISO C library. This configuration option controls the
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176 number of words of per-thread data that the kernel will
545
70b861ba8f8c * cdl/thread.cdl: Correct max legal value for
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177 allow. In the current implementation a bitmask is used to identify
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178 used per-thread data slots and so the maximum legal value must
549
7002f6e48db9 * src/common/thread.cxx: Fix potential warning and overflow with
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179 remain 32."
76
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180 }
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181
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182 cdl_component CYGNUM_KERNEL_THREADS_DATA_ALL {
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183 display "Bitmap of preallocated slots of thread data"
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184 flavor data
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185 calculated 15
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186 description "
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187 Per thread data options. Per thread data support is based loosely
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188 on that defined by POSIX. Each thread has an array of slots, up to
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189 CYGNUM_KERNEL_THREADS_DATA_MAX, that may contain data. Some of the
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190 slots have been preallocated to specific packages. Others may be
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191 allocated dynamically."
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192
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193 cdl_option CYGNUM_KERNEL_THREADS_DATA_KERNEL {
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194 display "Slot 0 preallocated for the kernel"
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195 flavor data
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196 calculated 0
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197 description "
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198 This option defines the index of a per-thread data
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199 slot which is reserved by
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200 the eCos kernel
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201 for private use."
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202 }
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203 cdl_option CYGNUM_KERNEL_THREADS_DATA_ITRON {
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204 display "Slot 1 preallocated for uITRON"
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205 flavor data
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206 calculated 1
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207 description "
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208 This option defines the index of a per-thread data
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209 slot which is reserved by
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210 the uITRON compatibility layer
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211 for private use."
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212 }
115
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213 cdl_option CYGNUM_KERNEL_THREADS_DATA_ERRNO {
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214 display "Slot 2 preallocated for errno"
76
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215 flavor data
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216 calculated 2
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217 description "
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218 This option defines the index of a per-thread data
115
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219 slot which is reserved for use by an errno variable."
76
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220 }
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221 cdl_option CYGNUM_KERNEL_THREADS_DATA_POSIX {
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222 display "Slot 3 preallocated for POSIX"
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223 flavor data
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224 calculated 3
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225 description "
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226 This option defines the index of a per-thread data
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227 slot which is reserved by
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228 POSIX
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229 for private use."
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230 }
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231 }
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232 }
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233
182
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234 cdl_component CYGPKG_KERNEL_THREADS_DESTRUCTORS {
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235 display "Thread destructors"
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236 default_value 0
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237 description "
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238 This option enables support for registered destructor functions to
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239 be called on thread exit."
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240
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241
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242 cdl_option CYGNUM_KERNEL_THREADS_DESTRUCTORS {
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243 display "Number of possible destructors"
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244 flavor data
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245 legal_values 1 to 65535
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246 default_value 8
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247 description "
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248 This option gives the number of possible destructors allowed.
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249 Increasing this will increase the size of every
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250 thread control structure if per-thread destructors are
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251 enabled."
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252 }
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253
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254 cdl_option CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD {
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255 display "Per-thread destructors"
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256 default_value 1
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257 description "
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258 Enabling this option makes the thread destructors a per-thread
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259 property, with each thread having its own list of destructors.
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260 Disabling this option makes the thread destructor list
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261 global so all threads have the same destructors."
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262 }
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263
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264 }
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265
76
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266 cdl_option CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE {
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267 display "Stack size for the idle thread"
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268 flavor data
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269 legal_values 512 to 65536
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270 default_value 2048
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271 description "
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272 This configuration option specifies the stack size in bytes
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273 for the idle thread. Unless the HAL is configured to use a
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274 separate interrupt stack this size must be sufficient to meet
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275 the requirements of all interrupt handlers - these
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276 requirements are cumulative if nested interrupted are
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277 enabled. Depending on the target architecture, the stack size
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278 typically has to be a multiple of eight or sixteen bytes.
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279 This will be overridden where it is used if the
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280 architectural HAL requires a minimum stack size
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281 to handle interrupts correctly."
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282 }
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283
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284 # ---------------------------------------------------------------------
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285 # Thread-related miscellania.
115
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286
76
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287 cdl_option CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT {
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288 display "Maximal suspend count"
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289 flavor data
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290 default_value 500
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291 description "
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292 This option provides for an assertion that the count value for
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293 counted thread suspends do not exceed set limits. This is to help
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294 with debugging, to allow a runaaway loop, for example, to be
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295 detected more easily.
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296
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297 If the option is not defined, no assert is included. Whether asserts
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298 are themselves included depends on infrastructure configury in
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299 infra.h"
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300 }
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301
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302 cdl_option CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT {
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303 display "Maximal wake count"
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304 flavor data
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305 default_value 500
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306 description "
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307 This option provides for an assertion that the count value for
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308 counted thread wakeups do not exceed set limits. This is to
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309 help with debugging, to allow a runaaway loop, for example, to
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310 be detected more easily.
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311
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312 If the option is not defined, no assert is included. Whether asserts
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313 are themselves included depends on infrastructure configury in
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314 infra.h"
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315 }
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316
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317
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318 #if CYGNUM_KERNEL_SCHED_PRIORITIES == 1
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319 # define CYGIMP_IDLE_THREAD_YIELD
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320 #endif
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321 cdl_option CYGIMP_IDLE_THREAD_YIELD {
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322 display "Idle thread must always yield"
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323 calculated 1
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324 active_if (CYGNUM_KERNEL_SCHED_PRIORITIES == 1)
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325 description "
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326 If the scheduler configuration only has a single priority
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327 level, then the idle thread must yield each time around its loop."
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328 }
143
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329