annotate packages/kernel/current/tests/kmutex3.c @ 3132:80f232caf539

* tests/except1.cxx (cause_exception): Fix compiler warning about variable that is set but not used. Enter CYGBLD_ATTRIB_UNUSED. * tests/kexcept1.c (cause_exception): Ditto. * tests/kmbox1.c (entry1): Fix compiler warning about variable that is set but not used. Use by a conditional CYGMTH_MBOX_PUT_CAN_WAIT. * tests/mbox1.cxx (entry1): Ditto. * tests/tm_basic.cxx (run_thread_tests, run_mbox_tests, run_flag_tests): Remove unused variables.
author sergeig
date Tue, 20 Mar 2012 15:39:58 +0000
parents 6724f8254bcb
children
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1 //==========================================================================
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2 //
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3 // kmutex3.c
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4 //
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5 // Mutex test 3 - priority inheritance
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6 //
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7 //==========================================================================
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): hmt
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43 // Contributors: hmt
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44 // Date: 2000-01-06, 2001-08-10
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45 // Description: Tests mutex priority inheritance. This is simply a
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46 // translation of the similarly named kernel test to the
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47 // KAPI, with the intention of also testing the new
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48 // "set the protocol at run-time" extensions.
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49 //####DESCRIPTIONEND####
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50
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51 #include <pkgconf/hal.h>
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52 #include <pkgconf/kernel.h>
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53
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54 #include <cyg/infra/testcase.h>
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55
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56 #include <cyg/hal/hal_arch.h> // CYGNUM_HAL_STACK_SIZE_TYPICAL
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57
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58 #include <cyg/infra/diag.h> // diag_printf
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59
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60 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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61 externC void
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62 cyg_hal_invoke_constructors();
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63 #endif
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64
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65 // ------------------------------------------------------------------------
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66 //
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67 // These checks should be enough; any other scheduler which has priorities
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68 // should manifest as having no priority inheritance, but otherwise fine,
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69 // so the test should work correctly.
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70
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71 #if defined(CYGVAR_KERNEL_COUNTERS_CLOCK) && \
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72 (CYGNUM_KERNEL_SCHED_PRIORITIES > 20) && \
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73 defined(CYGFUN_KERNEL_API_C) && \
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74 !defined(CYGPKG_KERNEL_SMP_SUPPORT)
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75
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76
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77 #include <cyg/kernel/kapi.h>
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78
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79 #include <cyg/infra/cyg_ass.h>
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80 #include <cyg/infra/cyg_trac.h>
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81 #include <cyg/infra/diag.h> // diag_printf
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82 #include CYGHWR_MEMORY_LAYOUT_H
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83
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84
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85 // ------------------------------------------------------------------------
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86 // manufacture a simpler feature test macro for priority inheritance than
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87 // the configuration gives us. We have priority inheritance if it is configured
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88 // as the only protocol, or if it is the default protocol for dynamic protocol
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89 // choice.
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90
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91 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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92 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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93 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_INHERIT
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94 # define PRIORITY_INHERITANCE "dynamic-default-inherit"
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95 # endif
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96 # else
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97 # define PRIORITY_INHERITANCE "static-inherit"
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98 # endif
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99 #endif
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100
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101 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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102 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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103 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_CEILING
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104 # if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY <= 5
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105 # define PRIORITY_INHERITANCE "dynamic-default-ceiling-high"
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106 # elif CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY >= 15
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107 # define NO_PRIORITY_INHERITANCE "dynamic-default-ceiling-low"
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108 # else
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109 # define PRIORITY_UNKNOWN "dynamic-default-ceiling-mid"
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110 # endif
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111 # endif
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112 # else
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113 # if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY <= 5
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114 # define PRIORITY_INHERITANCE "static-ceiling-high"
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115 # elif CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY >= 15
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116 # define NO_PRIORITY_INHERITANCE "static-ceiling-low"
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117 # else
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118 # define PRIORITY_UNKNOWN "static-ceiling-mid"
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119 # endif
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120 # endif
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121 #endif
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122
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123 #ifndef PRIORITY_INHERITANCE
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124 # ifndef NO_PRIORITY_INHERITANCE
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125 # define NO_PRIORITY_INHERITANCE "no scheme selected"
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126 # endif
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127 #endif
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128
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129 // ------------------------------------------------------------------------
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130 // Management functions
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131 //
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132 // Stolen from testaux.hxx and copied in here because I want to be able to
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133 // reset the world also.
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134 //
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135 // Translated into KAPI also.
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136
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137 #if (CYGMEM_REGION_ram_SIZE <= 32768)
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138 # define NTHREADS 5
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139 #else
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140 # define NTHREADS 7
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141 #endif
178
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142 #define STACKSIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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143
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144 static cyg_handle_t thread[NTHREADS] = { 0 };
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145
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146 typedef cyg_uint64 CYG_ALIGNMENT_TYPE;
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147
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148 static cyg_thread thread_obj[NTHREADS];
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149
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150 static CYG_ALIGNMENT_TYPE stack[NTHREADS] [
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151 (STACKSIZE+sizeof(CYG_ALIGNMENT_TYPE)-1)
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152 / sizeof(CYG_ALIGNMENT_TYPE) ];
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153
191
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154 static volatile int nthreads = 0;
178
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155
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156 #undef NULL
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157 #define NULL (0)
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158
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159 static cyg_handle_t new_thread( cyg_thread_entry_t *entry,
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160 cyg_addrword_t data,
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161 cyg_addrword_t priority,
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162 int do_resume )
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163 {
191
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164 int _nthreads = nthreads++;
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165
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166 CYG_ASSERT(_nthreads < NTHREADS,
178
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167 "Attempt to create more than NTHREADS threads");
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168
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169 cyg_thread_create( priority,
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170 entry,
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171 data,
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172 NULL, // no name
191
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173 (void *)(stack[_nthreads]),
178
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174 STACKSIZE,
191
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175 &thread[_nthreads],
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176 &thread_obj[_nthreads] );
178
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177
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178 if ( do_resume )
191
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179 cyg_thread_resume( thread[_nthreads] );
178
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180
191
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181 return thread[_nthreads];
178
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182 }
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183
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184
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185 static void kill_threads( void )
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186 {
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187 CYG_ASSERT(nthreads <= NTHREADS,
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188 "More than NTHREADS threads");
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189 CYG_ASSERT( cyg_thread_self() == thread[0],
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190 "kill_threads() not called from thread 0");
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191 while ( nthreads > 1 ) {
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192 nthreads--;
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193 if ( NULL != thread[nthreads] ) {
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194 do
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195 cyg_thread_kill( thread[nthreads] );
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196 while ( ! cyg_thread_delete ( thread[nthreads] ) );
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197 thread[nthreads] = NULL;
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198 }
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199 }
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200 CYG_ASSERT(nthreads == 1,
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201 "No threads left");
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202 }
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203
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204 // ------------------------------------------------------------------------
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205
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206 #define DELAYFACTOR 1 // for debugging
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207
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208 // ------------------------------------------------------------------------
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209
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210 static cyg_mutex_t mutex_obj;
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211 static cyg_mutex_t *mutex;
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212
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213 // These are for reporting back to the master thread
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214 volatile int got_it = 0;
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215 volatile int t3ran = 0;
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216 volatile int t3ended = 0;
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217 volatile int extras[4] = {0,0,0,0};
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218
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219 volatile int go_flag = 0; // but this one controls thread 3 from thread 2
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220
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221 // ------------------------------------------------------------------------
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222 // 0 to 3 of these run generally to interfere with the other processing,
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223 // to cause multiple prio inheritances, and clashes in any orders.
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224
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225 static void extra_thread( cyg_addrword_t data )
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226 {
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227 cyg_handle_t self = cyg_thread_self();
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228
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229 #define XINFO( z ) \
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230 do { z[13] = '0' + data; CYG_TEST_INFO( z ); } while ( 0 )
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231
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232 static char running[] = "Extra thread Xa running";
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233 static char exiting[] = "Extra thread Xa exiting";
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234 static char resumed[] = "Extra thread Xa resumed";
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235 static char locked[] = "Extra thread Xa locked";
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236 static char unlocked[] = "Extra thread Xa unlocked";
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237
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238 XINFO( running );
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239
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240 cyg_thread_suspend( self );
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241
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242 XINFO( resumed );
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243
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244 cyg_mutex_lock( mutex );
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245
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246 XINFO( locked );
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247
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248 cyg_mutex_unlock( mutex );
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249
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250 XINFO( unlocked );
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251
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252 extras[ data ] ++;
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253
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254 XINFO( exiting );
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255
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256 }
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257
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258 // ------------------------------------------------------------------------
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259
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260 static void t1( cyg_addrword_t data )
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261 {
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262 cyg_handle_t self = cyg_thread_self();
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263
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264 CYG_TEST_INFO( "Thread 1 running" );
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265
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266 cyg_thread_suspend( self );
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267
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268 cyg_mutex_lock( mutex );
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269
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270 got_it++;
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271
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272 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,1]" );
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273
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274 cyg_mutex_unlock( mutex );
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275
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276 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,2]" );
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277
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278 // That's all.
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279
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280 CYG_TEST_INFO( "Thread 1 exit" );
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281 }
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282
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283 // ------------------------------------------------------------------------
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284
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285 static void t2( cyg_addrword_t data )
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286 {
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287 cyg_handle_t self = cyg_thread_self();
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288 int i;
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289 cyg_tick_count_t then, now;
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290
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291 CYG_TEST_INFO( "Thread 2 running" );
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292
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293 CYG_TEST_CHECK( 0 == (data & ~0x77), "Bad T2 arg: extra bits" );
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294 CYG_TEST_CHECK( 0 == (data & (data >> 4)), "Bad T2 arg: overlap" );
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295
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296 cyg_thread_suspend( self );
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297
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298 // depending on our config argument, optionally restart some of the
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299 // extra threads to throw noise into the scheduler:
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300 for ( i = 0; i < 3; i++ )
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301 if ( (1 << i) & data ) // bits 0-2 control
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302 cyg_thread_resume( thread[i+4] ); // extras are thread[4-6]
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303
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304 cyg_thread_delay( DELAYFACTOR * 10 ); // let those threads run
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305
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306 cyg_scheduler_lock(); // do this next lot atomically
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307
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308 go_flag = 1; // unleash thread 3
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309 cyg_thread_resume( thread[1] ); // resume thread 1
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310
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311 // depending on our config argument, optionally restart some of the
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312 // extra threads to throw noise into the scheduler at this later point:
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313 for ( i = 4; i < 7; i++ )
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314 if ( (1 << i) & data ) // bits 4-6 control
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315 cyg_thread_resume( thread[i] ); // extras are thread[4-6]
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316
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317 cyg_scheduler_unlock(); // let scheduling proceed
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318
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319 // Need a delay (but not a CPU yield) to allow t3 to awaken and act on
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320 // the go_flag, otherwise we check these details below too soon.
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321 // Actually, waiting for the clock to tick a couple of times would be
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322 // better, so that is what we will do. Must be a busy-wait.
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323 then = cyg_current_time();
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324 do {
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325 now = cyg_current_time();
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326 // Wait longer than the delay in t3 waiting on go_flag
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327 } while ( now < (then + 3) );
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328
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329 #ifdef PRIORITY_UNKNOWN
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330 CYG_TEST_INFO( "Not checking: " PRIORITY_UNKNOWN );
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331 #else
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332 #ifdef PRIORITY_INHERITANCE
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333 CYG_TEST_INFO( "Checking priority scheme: " PRIORITY_INHERITANCE );
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334 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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335 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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336 #else
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337 CYG_TEST_INFO( "Checking NO priority scheme: " NO_PRIORITY_INHERITANCE );
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338 CYG_TEST_CHECK( 0 == t3ran, "Thread 3 DID run" );
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339 CYG_TEST_CHECK( 0 == got_it, "Thread 1 DID get the mutex" );
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340 #endif
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341 #endif
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342
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343 CYG_TEST_CHECK( 0 == t3ended, "Thread 3 ended prematurely [T2,1]" );
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344
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345 cyg_thread_delay( DELAYFACTOR * 20 ); // let those threads run
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346
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347 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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348 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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349 CYG_TEST_CHECK( 1 == t3ended, "Thread 3 has not ended" );
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350
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351 for ( i = 0; i < 3; i++ )
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352 if ( (1 << i) & (data | data >> 4) ) // bits 0-2 and 4-6 control
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353 CYG_TEST_CHECK( 1 == extras[i+1], "Extra thread did not run" );
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354 else
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355 CYG_TEST_CHECK( 0 == extras[i+1], "Extra thread ran" );
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356
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357 CYG_TEST_PASS( "Thread 2 exiting, AOK" );
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358 // That's all: restart the control thread.
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359 cyg_thread_resume( thread[0] );
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360 }
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361
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362 // ------------------------------------------------------------------------
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363
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364 static void t3( cyg_addrword_t data )
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365 {
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366 CYG_TEST_INFO( "Thread 3 running" );
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367
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368 cyg_mutex_lock( mutex );
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369
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370 cyg_thread_delay( DELAYFACTOR * 5 ); // let thread 3a run
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371
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372 cyg_thread_resume( thread[2] ); // resume thread 2
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373
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374 while ( 0 == go_flag )
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375 cyg_thread_delay(1); // wait until we are told to go
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376
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377 t3ran ++; // record the fact
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378
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379 CYG_TEST_CHECK( 0 == got_it, "Thread 1 claims to have got my mutex" );
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380
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381 cyg_mutex_unlock( mutex );
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382
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383 t3ended ++; // record that we came back
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384
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385 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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386
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387 CYG_TEST_INFO( "Thread 3 exit" );
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388 }
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389
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390 // ------------------------------------------------------------------------
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391
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392 static void control_thread( cyg_addrword_t data )
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393 {
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394 cyg_handle_t self = cyg_thread_self();
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395 int i, z;
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396
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397 CYG_TEST_INIT();
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398 CYG_TEST_INFO( "Control Thread running" );
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399
181
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400 // Go through the 27 possibilities of resuming the extra threads
178
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401 // 0: not at all
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402 // 1: early in the process
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403 // 2: later on
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404 // which are represented by bits 0-3 and 4-6 resp in the argument to
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405 // thread 2 (none set means no resume at all).
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406 for ( i = 0; i < 27; i++ ) {
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407 static int xx[] = { 0, 1, 16 };
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408 int j = i % 3;
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409 int k = (i / 3) % 3;
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410 int l = (i / 9) % 3;
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411
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412 int d = xx[j] | (xx[k]<<1) | (xx[l]<<2) ;
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413
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414 if ( cyg_test_is_simulator && (0 != i && 13 != i && 26 != i) )
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415 continue; // 13 is 111 base 3, 26 is 222 base 3
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416
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417 #ifdef PRIORITY_INHERITANCE
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418 // If the simple scheme plus relay enhancement, or any other
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419 // *complete* scheme, we can run all three ancillary threads no
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420 // problem, so no special action here.
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421
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422 #else
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423 // If no priority inheritance at all, running threads 1a and 2a is
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424 // OK, but not thread 3a; it blocks the world.
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425 if ( l ) // Cannot run thread 3a if no
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426 break; // priority inheritance at all.
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427 #endif
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428
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429 mutex = &mutex_obj;
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430 cyg_mutex_init( mutex );
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431
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432 got_it = 0;
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433 t3ran = 0;
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434 t3ended = 0;
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435 for ( z = 0; z < 4; z++ ) extras[z] = 0;
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436 go_flag = 0;
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437
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438 new_thread( t1, 0, 5, 1 ); // Slot 1
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439 new_thread( t2, d, 10, 1 ); // Slot 2
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440 new_thread( t3, 0, 15, 1 ); // Slot 3
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441
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442 new_thread( extra_thread, 1, 8, j ); // Slot 4
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443 new_thread( extra_thread, 2, 12, k ); // Slot 5
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444 new_thread( extra_thread, 3, 17, l ); // Slot 6
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diff changeset
445
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446 {
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447 static char *a[] = { "inactive", "run early", "run late" };
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448 diag_printf( "\n----- [%2d] New Cycle: 0x%02x, Threads 1a %s, 2a %s, 3a %s -----\n",
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449 i, d, a[j], a[k], a[l] );
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450 }
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451
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452 cyg_thread_suspend( self );
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453
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454 kill_threads();
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455 cyg_mutex_destroy( mutex );
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456 }
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457 CYG_TEST_EXIT( "Control Thread exit" );
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458 }
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459
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460 // ------------------------------------------------------------------------
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461
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462 externC void
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463 cyg_user_start( void )
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464 {
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465 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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466 cyg_hal_invoke_constructors();
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467 #endif
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468 new_thread( control_thread, 0, 2, 1 );
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469 }
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470
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471 #else // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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472
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473 externC void
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474 cyg_start( void )
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475 {
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476 CYG_TEST_INIT();
1507
92cf4ff674de * tests/kmutex3.c (cyg_start): Use CYG_TEST_NA.
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477 CYG_TEST_INFO("KMutex3 test requires:\n"
178
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478 "CYGFUN_KERNEL_API_C &&\n"
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479 "CYGVAR_KERNEL_COUNTERS_CLOCK &&\n"
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480 "(CYGNUM_KERNEL_SCHED_PRIORITIES > 20) &&\n"
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481 "!defined(CYGPKG_KERNEL_SMP_SUPPORT)\n");
1507
92cf4ff674de * tests/kmutex3.c (cyg_start): Use CYG_TEST_NA.
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482 CYG_TEST_NA("KMutex3 test requirements");
178
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483 }
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484 #endif // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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485
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486
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487 // ------------------------------------------------------------------------
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488 // Documentation: enclosed is the design of this test.
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489 //
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490 // It has been carefully constructed so that it does NOT use other kernel
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491 // facilities (aside from delay-task) to test that priority inheritance is
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492 // working, or not, as intended by the configuration.
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493 //
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494 // These notes describe the flow of control in one run of the test with the
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495 // ancillary tasks optionally interspersed. The details of how those extra
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496 // tasks are or are not allowed to run are not described.
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497 //
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498 //
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499 //
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500 // The only change in the test that depends on whether there is inheritance or
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501 // not is the check in thread 2 on "3-ran" and "got it" flags marked ****
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502 //
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503 //
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504 // volatile &c booleans:
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505 // "got it" = FALSE
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506 // "3-ran" = FALSE
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507 // "3-ended" = FALSE
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508 // "extras"[3] = FALSE
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509 //
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510 // thread 1. prio 5, self-suspend.
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511 //
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512 // thread 1a, prio 8, self-suspend.
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513 //
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514 // thread 2. prio 10, self-suspend.
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515 //
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516 // thread 2a, prio 12, self-suspend.
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517 //
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518 // thread 3. prio 15, runs, lock mutex, resume(2)
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519 //
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520 // thread 3a, prio 17, self-suspend.
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521 //
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522 // 2. runs,
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523 // 2. resume(3a) +++OPTIONAL
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524 // 2. resume(2a) +++OPTIONAL
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525 // 2. resume(1a) +++OPTIONAL
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526 // [1a lock-fail] thread 3->prio := 8
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527 //
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528 // [3. runs maybe, does the looping thing]
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529 //
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530 // 2. sleep a while...
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531 //
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532 // [2a lock-fail] thread 3->prio := 12
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533 //
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534 // [3. runs maybe, does the looping thing]
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535 //
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536 // [3a lock-fail] thread 3->prio unchanged
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537 //
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538 // [3. runs maybe, does the looping thing]
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diff changeset
539 //
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540 // 2. lock scheduler
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541 // 2. set "go-flag"
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542 // 2. resume(1)
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543 // 2. resume(1a) +++OPTIONAL
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544 // 2. resume(2a) +++OPTIONAL
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545 // 2. resume(3a) +++OPTIONAL
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diff changeset
546 // 2. unlock scheduler
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547 //
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548 // 1. runs, lock mutex - thread 3 has it locked
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549 //
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550 // 2. busy-waits a bit for thread 3 to come out of its delay() loop.
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551 // This must be a *busy*wait so that 3 can only run via the
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552 // inherited raised priority.
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553 //
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554 // [xa. all do the same: lock mutex, ]
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555 // [xa. unlock mutex ]
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556 // [xa. set a flag "extras"[x] to say we are done. ]
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diff changeset
557 // [xa. exit ]
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558 //
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559 //
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560 //
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561 // INHERIT
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562 // -------
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563 //
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564 // thread 3->prio := 5
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565 //
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566 // 3. runs,
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567 // 3. set a flag to say "3-ran",
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568 // 3. loop with a sleep(1) until "go-flag" is set.
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569 // 3. check "got it" is false,
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570 // 3. then unlock mutex,
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571 //
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572 // thread 3->prio := 15
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573 //
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574 // 1. runs, set a flag to say "got it",
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diff changeset
575 // 1. check "3-ended" flag is false
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diff changeset
576 // 1. unlock mutex,
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diff changeset
577 // 1. check "3-ended" flag is still false
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diff changeset
578 // 1. exit.
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diff changeset
579 //
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580 // [1a locks, unlocks, exits]
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diff changeset
581 //
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582 // 2. runs, check "3-ran" and "got it" flags are TRUE ****
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diff changeset
583 // 2. check "3-ended" flag is false
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diff changeset
584 // 2. sleeps for a while so that...
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diff changeset
585 //
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586 // [2a locks, unlocks, exits]
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parents:
diff changeset
587 //
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588 // 3. runs, set "3-ended" flag,
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589 // 3. check "3-ran" and "got it" flags
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590 // 3. exit
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591 //
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592 // [3a locks, unlocks, exits]
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593 //
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594 // 2. awakens, checks all flags true,
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595 // 2. check that all "extra" threads that we started have indeed run
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596 // 2. end of test.
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597 //
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598 //
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599 //
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600 //
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601 // NO-INHERIT
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602 // ----------
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603 // thread 1 is waiting on the mutex
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604 //
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605 // [1a lock-fail]
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606 //
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607 // 2. runs, checks that "3-ran" and "got it" flags are FALSE ****
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608 // 2. check "3-ended" flag is false
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609 // 2. sleeps for a while so that...
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610 //
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611 // [2a. lock-fail]
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612 //
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613 // 3. runs, set a flag to say "3-ran",
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614 // 3. check "got it" is false,
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615 // 3. then unlock mutex,
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616 //
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617 // 1. runs, set a flag to say "got it",
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618 // 1. check "3-ended" flag is false
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619 // 1. unlock mutex,
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620 // 1. check "3-ended" flag is still false
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621 // 1. exit.
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622 //
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623 // [1a locks, unlocks, exits]
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624 // [2a locks, unlocks, exits]
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625 //
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626 // 3. runs, set "3-ended" flag,
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627 // 3. check "3-ran" and "got it" flags
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628 // 3. exit
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629 //
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630 // [3a locks, unlocks, exits]
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631 //
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632 // 2. awakens, checks all flags true,
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633 // 2. check that all "extra" threads that we started have indeed run
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634 // 2. end of test.
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635 //
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636 //
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637 // (the end)
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638 //
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639 //
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640 // ------------------------------------------------------------------------
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641
181
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642 // EOF mutex3.c