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annotate packages/kernel/current/tests/mutex3.cxx @ 178:aa8364213009

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Merge from eCos master repository on 2001-08-15-01:50:29-BST
author jlarmour
date Wed, 15 Aug 2001 02:21:28 +0000
parents 4c750ce71ae3
children 678094f34118
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1 //==========================================================================
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2 //
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3 // mutex3.cxx
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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 //####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): hmt
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35 // Contributors: hmt
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36 // Date: 2000-01-06
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37 // Description: Tests mutex priority inheritance
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38 //####DESCRIPTIONEND####
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39
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40 #include <pkgconf/hal.h>
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41 #include <pkgconf/kernel.h>
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42
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43 #include <cyg/kernel/sched.hxx> // Cyg_Scheduler::start()
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44 #include <cyg/kernel/thread.hxx> // Cyg_Thread
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45
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46 #include <cyg/kernel/mutex.hxx>
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47
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48 #include <cyg/infra/testcase.h>
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49
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50 #include <cyg/kernel/sched.inl>
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51 #include <cyg/kernel/thread.inl>
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52
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53 #include <cyg/infra/diag.h> // diag_printf
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54
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55 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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56 externC void
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57 cyg_hal_invoke_constructors();
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58 #endif
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59
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60 // ------------------------------------------------------------------------
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61 //
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62 // These checks should be enough; any other scheduler which has priorities
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63 // should manifest as having no priority inheritance, but otherwise fine,
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64 // so the test should work correctly.
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66 #if defined(CYGVAR_KERNEL_COUNTERS_CLOCK) && \
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67 (CYGNUM_KERNEL_SCHED_PRIORITIES > 20) && \
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68 !defined(CYGPKG_KERNEL_SMP_SUPPORT)
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70 // ------------------------------------------------------------------------
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71 // Manufacture a simpler feature test macro for priority inheritance than
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72 // the configuration gives us. We have priority inheritance if it is configured
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73 // as the only protocol, or if it is the default protocol for dynamic protocol
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74 // choice.
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75 // FIXME: If we have dynamic protocol choice, we can also set priority inheritance
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76 // as the protocol to be used on the mutexes we are interested in. At present we
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77 // do not do this.
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78
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79 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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80 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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81 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_INHERIT
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82 # define PRIORITY_INHERITANCE "dynamic-default-inherit"
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83 # endif
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84 # else
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85 # define PRIORITY_INHERITANCE "static-inherit"
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86 # endif
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87 #endif
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88
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89 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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90 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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91 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_CEILING
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92 # if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY <= 5
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93 # define PRIORITY_INHERITANCE "dynamic-default-ceiling-high"
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94 # elif CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY >= 15
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95 # define NO_PRIORITY_INHERITANCE "dynamic-default-ceiling-low"
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96 # else
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97 # define PRIORITY_UNKNOWN "dynamic-default-ceiling-mid"
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98 # endif
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99 # endif
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100 # else
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101 # if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY <= 5
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102 # define PRIORITY_INHERITANCE "static-ceiling-high"
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103 # elif CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY >= 15
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104 # define NO_PRIORITY_INHERITANCE "static-ceiling-low"
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105 # else
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106 # define PRIORITY_UNKNOWN "static-ceiling-mid"
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107 # endif
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108 # endif
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109 #endif
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110
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111 #ifndef PRIORITY_INHERITANCE
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112 # ifndef NO_PRIORITY_INHERITANCE
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113 # define NO_PRIORITY_INHERITANCE "no scheme selected"
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114 # endif
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115 #endif
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116
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117 // ------------------------------------------------------------------------
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118 // Management functions
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119 //
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120 // Stolen from testaux.hxx and copied in here because I want to be able to
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121 // reset the world also.
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122
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123 #define NTHREADS 7
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124
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125 static inline void *operator new(size_t size, void *ptr) { return ptr; };
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126
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127 #define STACKSIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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128
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129 static Cyg_Thread *thread[NTHREADS] = { 0 };
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130
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131 typedef CYG_WORD64 CYG_ALIGNMENT_TYPE;
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132
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133 static CYG_ALIGNMENT_TYPE thread_obj[NTHREADS] [
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134 (sizeof(Cyg_Thread)+sizeof(CYG_ALIGNMENT_TYPE)-1)
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135 / sizeof(CYG_ALIGNMENT_TYPE) ];
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136
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137 static CYG_ALIGNMENT_TYPE stack[NTHREADS] [
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138 (STACKSIZE+sizeof(CYG_ALIGNMENT_TYPE)-1)
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139 / sizeof(CYG_ALIGNMENT_TYPE) ];
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140
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141 static int nthreads = 0;
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142
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143 static Cyg_Thread *new_thread( cyg_thread_entry *entry,
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144 CYG_ADDRWORD data,
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145 CYG_ADDRWORD priority,
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146 int do_resume )
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147 {
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148 CYG_ASSERT(nthreads < NTHREADS,
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149 "Attempt to create more than NTHREADS threads");
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150
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151 thread[nthreads] = new( (void *)&thread_obj[nthreads] )
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152 Cyg_Thread(priority,
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153 entry, data,
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154 NULL, // no name
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155 (CYG_ADDRESS)stack[nthreads], STACKSIZE );
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156
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157 if ( do_resume )
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158 thread[nthreads]->resume();
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159
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160 return thread[nthreads++];
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161 }
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162
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163
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164 static void kill_threads( void )
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165 {
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166 CYG_ASSERT(nthreads <= NTHREADS,
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167 "More than NTHREADS threads");
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168 CYG_ASSERT( Cyg_Thread::self() == thread[0],
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169 "kill_threads() not called from thread 0");
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170 while ( nthreads > 1 ) {
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171 nthreads--;
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172 if ( NULL != thread[nthreads] ) {
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173 thread[nthreads]->kill();
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174 thread[nthreads]->~Cyg_Thread();
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175 thread[nthreads] = NULL;
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176 }
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177 }
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178 CYG_ASSERT(nthreads == 1,
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179 "No threads left");
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180 }
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181
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182 // ------------------------------------------------------------------------
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183
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184 #define DELAYFACTOR 1 // for debugging
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185
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186 // ------------------------------------------------------------------------
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187
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188 static Cyg_Mutex mutex;
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189
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190 // These are for reporting back to the master thread
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191 volatile int got_it = 0;
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192 volatile int t3ran = 0;
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193 volatile int t3ended = 0;
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194 volatile int extras[4] = {0,0,0,0};
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195
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196 volatile int go_flag = 0; // but this one controls thread 3 from thread 2
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197
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198 // ------------------------------------------------------------------------
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199 // 0 to 3 of these run generally to interfere with the other processing,
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200 // to cause multiple prio inheritances, and clashes in any orders.
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201
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202 static void extra_thread( CYG_ADDRWORD data )
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203 {
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204 #define XINFO( z ) \
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205 do { z[13] = '0' + data; CYG_TEST_INFO( z ); } while ( 0 )
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206
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207 static char running[] = "Extra thread Xa running";
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208 static char exiting[] = "Extra thread Xa exiting";
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209 static char resumed[] = "Extra thread Xa resumed";
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210 static char locked[] = "Extra thread Xa locked";
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211 static char unlocked[] = "Extra thread Xa unlocked";
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212
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213 XINFO( running );
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214
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215 Cyg_Thread *self = Cyg_Thread::self();
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216
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217 self->suspend();
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218
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219 XINFO( resumed );
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220
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221 mutex.lock();
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222
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223 XINFO( locked );
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224
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225 mutex.unlock();
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226
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227 XINFO( unlocked );
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228
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229 extras[ data ] ++;
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230
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231 XINFO( exiting );
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232
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233 }
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234
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235 // ------------------------------------------------------------------------
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236
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237 static void t1( CYG_ADDRWORD data )
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238 {
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239 Cyg_Thread *self = Cyg_Thread::self();
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240
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241 CYG_TEST_INFO( "Thread 1 running" );
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242
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243 self->suspend();
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244
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245 mutex.lock();
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246
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247 got_it++;
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248
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249 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,1]" );
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250
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251 mutex.unlock();
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252
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253 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,2]" );
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254
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255 // That's all.
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256
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257 CYG_TEST_INFO( "Thread 1 exit" );
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258 }
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259
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260 // ------------------------------------------------------------------------
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261
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262 static void t2( CYG_ADDRWORD data )
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263 {
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264 Cyg_Thread *self = Cyg_Thread::self();
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265 int i;
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266 cyg_tick_count then, now;
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267
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268
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269 CYG_TEST_INFO( "Thread 2 running" );
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270
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271 CYG_TEST_CHECK( 0 == (data & ~0x77), "Bad T2 arg: extra bits" );
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272 CYG_TEST_CHECK( 0 == (data & (data >> 4)), "Bad T2 arg: overlap" );
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273
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274 self->suspend();
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275
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276 // depending on our config argument, optionally restart some of the
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277 // extra threads to throw noise into the scheduler:
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278 for ( i = 0; i < 3; i++ )
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279 if ( (1 << i) & data ) // bits 0-2 control
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280 thread[i+4]->resume(); // made sure extras are thread[4-6]
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281
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282 self->delay( DELAYFACTOR * 10 ); // let those threads run
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283
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284 Cyg_Scheduler::lock(); // do this next lot atomically
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285
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286 go_flag = 1; // unleash thread 3
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287 thread[1]->resume(); // resume thread 1
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288
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289 // depending on our config argument, optionally restart some of the
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290 // extra threads to throw noise into the scheduler at this later point:
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291 for ( i = 4; i < 7; i++ )
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292 if ( (1 << i) & data ) // bits 4-6 control
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293 thread[i]->resume(); // made sure extras are thread[4-6]
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294
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295 Cyg_Scheduler::unlock(); // let scheduling proceed
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296
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297 // Need a delay (but not a CPU yield) to allow t3 to awaken and act on
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298 // the go_flag, otherwise we check these details below too soon.
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299 // Actually, waiting for the clock to tick a couple of times would be
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300 // better, so that is what we will do. Must be a busy-wait.
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301 then = Cyg_Clock::real_time_clock->current_value();
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302 do {
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303 now = Cyg_Clock::real_time_clock->current_value();
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304 // Wait longer than the delay in t3 waiting on go_flag
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305 } while ( now < (then + 3) );
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306
178
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307 #ifdef PRIORITY_UNKNOWN
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308 CYG_TEST_INFO( "Not checking: " PRIORITY_UNKNOWN );
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309 #else
115
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310 #ifdef PRIORITY_INHERITANCE
178
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311 CYG_TEST_INFO( "Checking priority scheme: " PRIORITY_INHERITANCE );
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312 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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313 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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314 #else
178
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315 CYG_TEST_INFO( "Checking NO priority scheme: " NO_PRIORITY_INHERITANCE );
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316 CYG_TEST_CHECK( 0 == t3ran, "Thread 3 DID run" );
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317 CYG_TEST_CHECK( 0 == got_it, "Thread 1 DID get the mutex" );
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318 #endif
178
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319 #endif
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320
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321 CYG_TEST_CHECK( 0 == t3ended, "Thread 3 ended prematurely [T2,1]" );
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322
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323 self->delay( DELAYFACTOR * 20 ); // let those threads run
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324
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325 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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326 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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327 CYG_TEST_CHECK( 1 == t3ended, "Thread 3 has not ended" );
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328
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329 for ( i = 0; i < 3; i++ )
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330 if ( (1 << i) & (data | data >> 4) ) // bits 0-2 and 4-6 control
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331 CYG_TEST_CHECK( 1 == extras[i+1], "Extra thread did not run" );
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332 else
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333 CYG_TEST_CHECK( 0 == extras[i+1], "Extra thread ran" );
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334
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335 CYG_TEST_PASS( "Thread 2 exiting, AOK" );
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336 // That's all: restart the control thread.
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337 thread[0]->resume();
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338 }
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339
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340 // ------------------------------------------------------------------------
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341
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342 static void t3( CYG_ADDRWORD data )
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343 {
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344 Cyg_Thread *self = Cyg_Thread::self();
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345
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346 CYG_TEST_INFO( "Thread 3 running" );
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347
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348 mutex.lock();
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349
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350 self->delay( DELAYFACTOR * 5 ); // let thread 3a run
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351
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352 thread[2]->resume(); // resume thread 2
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353
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354 while ( 0 == go_flag )
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355 self->delay(1); // wait until we are told to go
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356
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357 t3ran ++; // record the fact
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358
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359 CYG_TEST_CHECK( 0 == got_it, "Thread 1 claims to have got my mutex" );
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360
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361 mutex.unlock();
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362
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363 t3ended ++; // record that we came back
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364
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365 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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366
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367 CYG_TEST_INFO( "Thread 3 exit" );
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368 }
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369
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370 // ------------------------------------------------------------------------
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371
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372 static void control_thread( CYG_ADDRWORD data )
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373 {
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374 Cyg_Thread *self = Cyg_Thread::self();
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375 int i;
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376
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377 CYG_TEST_INIT();
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378 CYG_TEST_INFO( "Control Thread running" );
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379
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380 // Go through the 27 possibilitied of resuming the extra threads
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381 // 0: not at all
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382 // 1: early in the process
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383 // 2: later on
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384 // which are represented by bits 0-3 and 4-6 resp in the argument to
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385 // thread 2 (none set means no resume at all).
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386 for ( i = 0; i < 27; i++ ) {
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387 static int xx[] = { 0, 1, 16 };
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388 int j = i % 3;
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389 int k = (i / 3) % 3;
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390 int l = (i / 9) % 3;
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391
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392 int d = xx[j] | (xx[k]<<1) | (xx[l]<<2) ;
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393
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394 if ( cyg_test_is_simulator && (0 != i && 13 != i && 26 != i) )
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395 continue; // 13 is 111 base 3, 26 is 222 base 3
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396
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397 #ifdef PRIORITY_INHERITANCE
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398 // If the simple scheme plus relay enhancement, or any other
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399 // *complete* scheme, we can run all three ancillary threads no
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400 // problem, so no special action here.
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401
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402 #else
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403 // If no priority inheritance at all, running threads 1a and 2a is
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404 // OK, but not thread 3a; it blocks the world.
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405 if ( l ) // Cannot run thread 3a if no
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406 break; // priority inheritance at all.
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407 #endif
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408
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409 mutex = Cyg_Mutex(); // Reinitialize this
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410
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411 got_it = 0;
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412 t3ran = 0;
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413 t3ended = 0;
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414 for ( int z = 0; z < 4; z++ ) extras[z] = 0;
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415 go_flag = 0;
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416
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417 new_thread( t1, 0, 5, 1 ); // Slot 1
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418 new_thread( t2, d, 10, 1 ); // Slot 2
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419 new_thread( t3, 0, 15, 1 ); // Slot 3
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420
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421 new_thread( extra_thread, 1, 8, j ); // Slot 4
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422 new_thread( extra_thread, 2, 12, k ); // Slot 5
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423 new_thread( extra_thread, 3, 17, l ); // Slot 6
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424
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425 {
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426 static char *a[] = { "inactive", "run early", "run late" };
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427 diag_printf( "\n----- [%2d] New Cycle: 0x%02x, Threads 1a %s, 2a %s, 3a %s -----\n",
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428 i, d, a[j], a[k], a[l] );
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429 }
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430
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431 self->suspend();
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432
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433 kill_threads();
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434 mutex.~Cyg_Mutex();
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435 }
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436 CYG_TEST_EXIT( "Control Thread exit" );
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437 }
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438
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439 // ------------------------------------------------------------------------
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440
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441 externC void
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442 cyg_user_start( void )
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443 {
130
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444 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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445 cyg_hal_invoke_constructors();
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446 #endif
62
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447 new_thread( control_thread, 0, 2, 1 );
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448 }
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449
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450 #else // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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451
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452 externC void
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453 cyg_start( void )
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454 {
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455 CYG_TEST_INIT();
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456 CYG_TEST_PASS_FINISH("Mutex3 test requires:\n"
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457 "CYGVAR_KERNEL_COUNTERS_CLOCK &&\n"
177
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458 "(CYGNUM_KERNEL_SCHED_PRIORITIES > 20) &&\n"
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459 "!defined(CYGPKG_KERNEL_SMP_SUPPORT)\n");
62
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460 }
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461 #endif // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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462
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463
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464 // ------------------------------------------------------------------------
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465 // Documentation: enclosed is the design of this test.
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466 //
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467 // It has been carefully constructed so that it does NOT use other kernel
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468 // facilities (aside from delay-task) to test that priority inheritance is
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469 // working, or not, as intended by the configuration.
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470 //
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471 // These notes describe the flow of control in one run of the test with the
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472 // ancillary tasks optionally interspersed. The details of how those extra
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473 // tasks are or are not allowed to run are not described.
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474 //
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475 //
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476 //
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477 // The only change in the test that depends on whether there is inheritance or
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478 // not is the check in thread 2 on "3-ran" and "got it" flags marked ****
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479 //
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480 //
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481 // volatile &c booleans:
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482 // "got it" = FALSE
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483 // "3-ran" = FALSE
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484 // "3-ended" = FALSE
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485 // "extras"[3] = FALSE
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486 //
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487 // thread 1. prio 5, self-suspend.
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488 //
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489 // thread 1a, prio 8, self-suspend.
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490 //
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491 // thread 2. prio 10, self-suspend.
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492 //
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493 // thread 2a, prio 12, self-suspend.
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494 //
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495 // thread 3. prio 15, runs, lock mutex, resume(2)
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496 //
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497 // thread 3a, prio 17, self-suspend.
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498 //
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499 // 2. runs,
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500 // 2. resume(3a) +++OPTIONAL
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501 // 2. resume(2a) +++OPTIONAL
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502 // 2. resume(1a) +++OPTIONAL
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503 // [1a lock-fail] thread 3->prio := 8
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504 //
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505 // [3. runs maybe, does the looping thing]
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506 //
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507 // 2. sleep a while...
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508 //
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509 // [2a lock-fail] thread 3->prio := 12
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510 //
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511 // [3. runs maybe, does the looping thing]
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512 //
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513 // [3a lock-fail] thread 3->prio unchanged
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514 //
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515 // [3. runs maybe, does the looping thing]
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516 //
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517 // 2. lock scheduler
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518 // 2. set "go-flag"
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519 // 2. resume(1)
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520 // 2. resume(1a) +++OPTIONAL
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521 // 2. resume(2a) +++OPTIONAL
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522 // 2. resume(3a) +++OPTIONAL
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523 // 2. unlock scheduler
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524 //
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525 // 1. runs, lock mutex - thread 3 has it locked
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526 //
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527 // 2. busy-waits a bit for thread 3 to come out of its delay() loop.
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528 // This must be a *busy*wait so that 3 can only run via the
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529 // inherited raised priority.
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530 //
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531 // [xa. all do the same: lock mutex, ]
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532 // [xa. unlock mutex ]
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533 // [xa. set a flag "extras"[x] to say we are done. ]
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534 // [xa. exit ]
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535 //
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diff changeset
536 //
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537 //
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538 // INHERIT
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539 // -------
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540 //
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541 // thread 3->prio := 5
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542 //
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543 // 3. runs,
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diff changeset
544 // 3. set a flag to say "3-ran",
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545 // 3. loop with a sleep(1) until "go-flag" is set.
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546 // 3. check "got it" is false,
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547 // 3. then unlock mutex,
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548 //
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549 // thread 3->prio := 15
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550 //
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551 // 1. runs, set a flag to say "got it",
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diff changeset
552 // 1. check "3-ended" flag is false
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diff changeset
553 // 1. unlock mutex,
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diff changeset
554 // 1. check "3-ended" flag is still false
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diff changeset
555 // 1. exit.
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diff changeset
556 //
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557 // [1a locks, unlocks, exits]
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diff changeset
558 //
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559 // 2. runs, check "3-ran" and "got it" flags are TRUE ****
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diff changeset
560 // 2. check "3-ended" flag is false
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561 // 2. sleeps for a while so that...
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diff changeset
562 //
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563 // [2a locks, unlocks, exits]
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564 //
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565 // 3. runs, set "3-ended" flag,
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566 // 3. check "3-ran" and "got it" flags
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567 // 3. exit
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568 //
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569 // [3a locks, unlocks, exits]
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570 //
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571 // 2. awakens, checks all flags true,
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572 // 2. check that all "extra" threads that we started have indeed run
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573 // 2. end of test.
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574 //
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575 //
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576 //
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577 //
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578 // NO-INHERIT
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579 // ----------
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580 // thread 1 is waiting on the mutex
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581 //
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582 // [1a lock-fail]
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583 //
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584 // 2. runs, checks that "3-ran" and "got it" flags are FALSE ****
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585 // 2. check "3-ended" flag is false
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586 // 2. sleeps for a while so that...
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587 //
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588 // [2a. lock-fail]
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589 //
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590 // 3. runs, set a flag to say "3-ran",
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591 // 3. check "got it" is false,
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592 // 3. then unlock mutex,
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593 //
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594 // 1. runs, set a flag to say "got it",
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595 // 1. check "3-ended" flag is false
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596 // 1. unlock mutex,
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597 // 1. check "3-ended" flag is still false
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598 // 1. exit.
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599 //
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600 // [1a locks, unlocks, exits]
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601 // [2a locks, unlocks, exits]
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602 //
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603 // 3. runs, set "3-ended" flag,
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604 // 3. check "3-ran" and "got it" flags
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605 // 3. exit
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606 //
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607 // [3a locks, unlocks, exits]
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608 //
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609 // 2. awakens, checks all flags true,
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610 // 2. check that all "extra" threads that we started have indeed run
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611 // 2. end of test.
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612 //
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613 //
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614 // (the end)
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615 //
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616 //
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617 // ------------------------------------------------------------------------
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618
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619 // EOF mutex3.cxx