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annotate packages/kernel/current/tests/mutex3.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 435cced73e2f
children eb9fd8c04db3
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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/kernel.h>
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41
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42 #include <cyg/kernel/sched.hxx> // Cyg_Scheduler::start()
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43 #include <cyg/kernel/thread.hxx> // Cyg_Thread
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44
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45 #include <cyg/kernel/mutex.hxx>
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46
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47 #include <cyg/infra/testcase.h>
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48
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49 #include <cyg/kernel/sched.inl>
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50 #include <cyg/kernel/thread.inl>
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51
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52 #include <cyg/infra/diag.h> // diag_printf
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53
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54 // ------------------------------------------------------------------------
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55 //
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56 // These checks should be enough; any other scheduler which has priorities
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57 // should manifest as having no priority inheritance, but otherwise fine,
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58 // so the test should work correctly.
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59
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60 #if defined(CYGVAR_KERNEL_COUNTERS_CLOCK) && \
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61 (CYGNUM_KERNEL_SCHED_PRIORITIES > 20)
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63 // ------------------------------------------------------------------------
115
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64 // Manufacture a simpler feature test macro for priority inheritance than
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65 // the configuration gives us. We have priority inheritance if it is configured
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66 // as the only protocol, or if it is the default protocol for dynamic protocol
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67 // choice.
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68 // FIXME: If we have dynamic protocol choice, we can also set priority inheritance
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69 // as the protocol to be used on the mutexes we are interested in. At present we
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70 // do not do this.
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71
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72 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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73 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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74 # ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_INHERIT
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75 # define PRIORITY_INHERITANCE
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76 # else
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77 # undef PRIORITY_INHERITANCE
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78 # endif
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79 # else
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80 # define PRIORITY_INHERITANCE
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81 # endif
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82 #else
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83 # undef PRIORITY_INHERITANCE
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84 #endif
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85
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86 // ------------------------------------------------------------------------
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87 // Management functions
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88 //
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89 // Stolen from testaux.hxx and copied in here because I want to be able to
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90 // reset the world also.
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91
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92 #define NTHREADS 7
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93
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94 static inline void *operator new(size_t size, void *ptr) { return ptr; };
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95
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96 #define STACKSIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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97
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98 static Cyg_Thread *thread[NTHREADS] = { 0 };
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99
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100 typedef CYG_WORD64 CYG_ALIGNMENT_TYPE;
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101
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102 static CYG_ALIGNMENT_TYPE thread_obj[NTHREADS] [
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103 (sizeof(Cyg_Thread)+sizeof(CYG_ALIGNMENT_TYPE)-1)
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104 / sizeof(CYG_ALIGNMENT_TYPE) ];
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105
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106 static CYG_ALIGNMENT_TYPE stack[NTHREADS] [
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107 (STACKSIZE+sizeof(CYG_ALIGNMENT_TYPE)-1)
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108 / sizeof(CYG_ALIGNMENT_TYPE) ];
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109
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110 static int nthreads = 0;
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111
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112 static Cyg_Thread *new_thread( cyg_thread_entry *entry,
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113 CYG_ADDRWORD data,
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114 CYG_ADDRWORD priority,
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115 int do_resume )
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116 {
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117 CYG_ASSERT(nthreads < NTHREADS,
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118 "Attempt to create more than NTHREADS threads");
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119
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120 thread[nthreads] = new( (void *)&thread_obj[nthreads] )
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121 Cyg_Thread(priority,
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122 entry, data,
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123 NULL, // no name
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124 (CYG_ADDRESS)stack[nthreads], STACKSIZE );
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125
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126 if ( do_resume )
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127 thread[nthreads]->resume();
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128
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129 return thread[nthreads++];
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130 }
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131
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132
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133 static void kill_threads( void )
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134 {
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135 CYG_ASSERT(nthreads <= NTHREADS,
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136 "More than NTHREADS threads");
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137 CYG_ASSERT( Cyg_Thread::self() == thread[0],
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138 "kill_threads() not called from thread 0");
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139 while ( nthreads > 1 ) {
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140 nthreads--;
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141 if ( NULL != thread[nthreads] ) {
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142 thread[nthreads]->kill();
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143 thread[nthreads]->~Cyg_Thread();
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144 thread[nthreads] = NULL;
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145 }
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146 }
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147 CYG_ASSERT(nthreads == 1,
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148 "No threads left");
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149 }
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150
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151 // ------------------------------------------------------------------------
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152
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153 #define DELAYFACTOR 1 // for debugging
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154
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155 // ------------------------------------------------------------------------
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156
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157 static Cyg_Mutex mutex;
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158
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159 // These are for reporting back to the master thread
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160 volatile int got_it = 0;
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161 volatile int t3ran = 0;
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162 volatile int t3ended = 0;
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163 volatile int extras[4] = {0,0,0,0};
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164
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165 volatile int go_flag = 0; // but this one controls thread 3 from thread 2
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166
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167 // ------------------------------------------------------------------------
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168 // 0 to 3 of these run generally to interfere with the other processing,
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169 // to cause multiple prio inheritances, and clashes in any orders.
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170
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171 static void extra_thread( CYG_ADDRWORD data )
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172 {
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173 #define XINFO( z ) \
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174 do { z[13] = '0' + data; CYG_TEST_INFO( z ); } while ( 0 )
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175
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176 static char running[] = "Extra thread Xa running";
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177 static char exiting[] = "Extra thread Xa exiting";
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178 static char resumed[] = "Extra thread Xa resumed";
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179 static char locked[] = "Extra thread Xa locked";
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180 static char unlocked[] = "Extra thread Xa unlocked";
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181
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182 XINFO( running );
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183
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184 Cyg_Thread *self = Cyg_Thread::self();
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185
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186 self->suspend();
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187
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188 XINFO( resumed );
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189
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190 mutex.lock();
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191
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192 XINFO( locked );
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193
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194 mutex.unlock();
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195
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196 XINFO( unlocked );
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197
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198 extras[ data ] ++;
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199
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200 XINFO( exiting );
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201
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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 static void t1( CYG_ADDRWORD data )
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207 {
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208 Cyg_Thread *self = Cyg_Thread::self();
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209
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210 CYG_TEST_INFO( "Thread 1 running" );
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211
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212 self->suspend();
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213
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214 mutex.lock();
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215
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216 got_it++;
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217
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218 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,1]" );
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219
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220 mutex.unlock();
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221
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222 CYG_TEST_CHECK( 0 == t3ended, "T3 ended prematurely [T1,2]" );
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223
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224 // That's all.
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225
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226 CYG_TEST_INFO( "Thread 1 exit" );
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227 }
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228
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229 // ------------------------------------------------------------------------
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230
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231 static void t2( CYG_ADDRWORD data )
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232 {
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233 Cyg_Thread *self = Cyg_Thread::self();
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234 int i;
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235 cyg_tick_count then, now;
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236
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237
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238 CYG_TEST_INFO( "Thread 2 running" );
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239
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240 CYG_TEST_CHECK( 0 == (data & ~0x77), "Bad T2 arg: extra bits" );
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241 CYG_TEST_CHECK( 0 == (data & (data >> 4)), "Bad T2 arg: overlap" );
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242
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243 self->suspend();
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244
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245 // depending on our config argument, optionally restart some of the
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246 // extra threads to throw noise into the scheduler:
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247 for ( i = 0; i < 3; i++ )
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248 if ( (1 << i) & data ) // bits 0-2 control
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249 thread[i+4]->resume(); // made sure extras are thread[4-6]
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250
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251 self->delay( DELAYFACTOR * 10 ); // let those threads run
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252
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253 Cyg_Scheduler::lock(); // do this next lot atomically
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254
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255 go_flag = 1; // unleash thread 3
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256 thread[1]->resume(); // resume thread 1
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257
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258 // depending on our config argument, optionally restart some of the
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259 // extra threads to throw noise into the scheduler at this later point:
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260 for ( i = 4; i < 7; i++ )
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261 if ( (1 << i) & data ) // bits 4-6 control
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262 thread[i]->resume(); // made sure extras are thread[4-6]
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263
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264 Cyg_Scheduler::unlock(); // let scheduling proceed
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265
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266 // Need a delay (but not a CPU yield) to allow t3 to awaken and act on
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267 // the go_flag, otherwise we check these details below too soon.
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268 // Actually, waiting for the clock to tick a couple of times would be
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269 // better, so that is what we will do. Must be a busy-wait.
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270 then = Cyg_Clock::real_time_clock->current_value();
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271 do {
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272 now = Cyg_Clock::real_time_clock->current_value();
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273 // Wait longer than the delay in t3 waiting on go_flag
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274 } while ( now < (then + 3) );
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275
115
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276 #ifdef PRIORITY_INHERITANCE
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277 CYG_TEST_INFO( "Checking for mutex priority inheritance" );
62
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278 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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279 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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280 #else
115
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281 CYG_TEST_INFO( "Checking for NO mutex priority inheritance" );
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282 CYG_TEST_CHECK( 0 == t3ran, "Thread 3 DID run" );
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283 CYG_TEST_CHECK( 0 == got_it, "Thread 1 DID get the mutex" );
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284 #endif
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285
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286 CYG_TEST_CHECK( 0 == t3ended, "Thread 3 ended prematurely [T2,1]" );
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287
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288 self->delay( DELAYFACTOR * 20 ); // let those threads run
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289
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290 CYG_TEST_CHECK( 1 == t3ran, "Thread 3 did not run" );
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291 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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292 CYG_TEST_CHECK( 1 == t3ended, "Thread 3 has not ended" );
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293
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294 for ( i = 0; i < 3; i++ )
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295 if ( (1 << i) & (data | data >> 4) ) // bits 0-2 and 4-6 control
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296 CYG_TEST_CHECK( 1 == extras[i+1], "Extra thread did not run" );
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297 else
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298 CYG_TEST_CHECK( 0 == extras[i+1], "Extra thread ran" );
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299
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300 CYG_TEST_PASS( "Thread 2 exiting, AOK" );
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301 // That's all: restart the control thread.
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302 thread[0]->resume();
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303 }
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304
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305 // ------------------------------------------------------------------------
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306
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307 static void t3( CYG_ADDRWORD data )
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308 {
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309 Cyg_Thread *self = Cyg_Thread::self();
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310
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311 CYG_TEST_INFO( "Thread 3 running" );
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312
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313 mutex.lock();
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314
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315 self->delay( DELAYFACTOR * 5 ); // let thread 3a run
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316
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317 thread[2]->resume(); // resume thread 2
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318
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319 while ( 0 == go_flag )
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320 self->delay(1); // wait until we are told to go
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321
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322 t3ran ++; // record the fact
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323
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324 CYG_TEST_CHECK( 0 == got_it, "Thread 1 claims to have got my mutex" );
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325
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326 mutex.unlock();
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327
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328 t3ended ++; // record that we came back
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329
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330 CYG_TEST_CHECK( 1 == got_it, "Thread 1 did not get the mutex" );
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331
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332 CYG_TEST_INFO( "Thread 3 exit" );
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333 }
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334
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335 // ------------------------------------------------------------------------
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336
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337 static void control_thread( CYG_ADDRWORD data )
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338 {
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339 Cyg_Thread *self = Cyg_Thread::self();
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340 int i;
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341
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342 CYG_TEST_INIT();
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343 CYG_TEST_INFO( "Control Thread running" );
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344
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345 // Go through the 27 possibilitied of resuming the extra threads
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346 // 0: not at all
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347 // 1: early in the process
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348 // 2: later on
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349 // which are represented by bits 0-3 and 4-6 resp in the argument to
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350 // thread 2 (none set means no resume at all).
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351 for ( i = 0; i < 27; i++ ) {
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352 static int xx[] = { 0, 1, 16 };
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353 int j = i % 3;
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354 int k = (i / 3) % 3;
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355 int l = (i / 9) % 3;
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356
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357 int d = xx[j] | (xx[k]<<1) | (xx[l]<<2) ;
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358
76
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359 if ( cyg_test_is_simulator && (0 != i && 13 != i && 26 != i) )
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360 continue; // 13 is 111 base 3, 26 is 222 base 3
62
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361
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362 #ifdef PRIORITY_INHERITANCE
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363 // If the simple scheme plus relay enhancement, or any other
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364 // *complete* scheme, we can run all three ancillary threads no
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365 // problem, so no special action here.
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366
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367 #else
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368 // If no priority inheritance at all, running threads 1a and 2a is
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369 // OK, but not thread 3a; it blocks the world.
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370 if ( l ) // Cannot run thread 3a if no
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371 break; // priority inheritance at all.
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372 #endif
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373
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374 mutex = Cyg_Mutex(); // Reinitialize this
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375
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376 got_it = 0;
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377 t3ran = 0;
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378 t3ended = 0;
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379 for ( int z = 0; z < 4; z++ ) extras[z] = 0;
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380 go_flag = 0;
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381
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382 new_thread( t1, 0, 5, 1 ); // Slot 1
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383 new_thread( t2, d, 10, 1 ); // Slot 2
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384 new_thread( t3, 0, 15, 1 ); // Slot 3
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385
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386 new_thread( extra_thread, 1, 8, j ); // Slot 4
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387 new_thread( extra_thread, 2, 12, k ); // Slot 5
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388 new_thread( extra_thread, 3, 17, l ); // Slot 6
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389
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390 {
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391 static char *a[] = { "inactive", "run early", "run late" };
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392 diag_printf( "\n----- [%2d] New Cycle: 0x%02x, Threads 1a %s, 2a %s, 3a %s -----\n",
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393 i, d, a[j], a[k], a[l] );
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394 }
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395
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396 self->suspend();
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397
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398 kill_threads();
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399 mutex.~Cyg_Mutex();
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400 }
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401 CYG_TEST_EXIT( "Control Thread exit" );
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402 }
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403
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404 // ------------------------------------------------------------------------
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405
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406 externC void
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407 cyg_user_start( void )
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408 {
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409 new_thread( control_thread, 0, 2, 1 );
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410 }
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411
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412 #else // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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413
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414 externC void
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415 cyg_start( void )
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416 {
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417 CYG_TEST_INIT();
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418 CYG_TEST_PASS_FINISH("Mutex3 test requires:\n"
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419 "CYGVAR_KERNEL_COUNTERS_CLOCK &&\n"
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420 "(CYGNUM_KERNEL_SCHED_PRIORITIES > 20)\n");
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421 }
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422 #endif // CYGVAR_KERNEL_COUNTERS_CLOCK &c
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423
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424
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425 // ------------------------------------------------------------------------
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426 // Documentation: enclosed is the design of this test.
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diff changeset
427 //
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jlarmour
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428 // It has been carefully constructed so that it does NOT use other kernel
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jlarmour
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diff changeset
429 // facilities (aside from delay-task) to test that priority inheritance is
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jlarmour
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diff changeset
430 // working, or not, as intended by the configuration.
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431 //
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432 // These notes describe the flow of control in one run of the test with the
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433 // ancillary tasks optionally interspersed. The details of how those extra
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diff changeset
434 // tasks are or are not allowed to run are not described.
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jlarmour
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diff changeset
435 //
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jlarmour
parents:
diff changeset
436 //
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diff changeset
437 //
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438 // The only change in the test that depends on whether there is inheritance or
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439 // not is the check in thread 2 on "3-ran" and "got it" flags marked ****
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jlarmour
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440 //
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441 //
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jlarmour
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442 // volatile &c booleans:
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443 // "got it" = FALSE
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444 // "3-ran" = FALSE
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jlarmour
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445 // "3-ended" = FALSE
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jlarmour
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diff changeset
446 // "extras"[3] = FALSE
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jlarmour
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diff changeset
447 //
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448 // thread 1. prio 5, self-suspend.
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diff changeset
449 //
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jlarmour
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450 // thread 1a, prio 8, self-suspend.
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jlarmour
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diff changeset
451 //
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jlarmour
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452 // thread 2. prio 10, self-suspend.
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jlarmour
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diff changeset
453 //
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454 // thread 2a, prio 12, self-suspend.
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diff changeset
455 //
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456 // thread 3. prio 15, runs, lock mutex, resume(2)
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457 //
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458 // thread 3a, prio 17, self-suspend.
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jlarmour
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diff changeset
459 //
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jlarmour
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460 // 2. runs,
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diff changeset
461 // 2. resume(3a) +++OPTIONAL
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diff changeset
462 // 2. resume(2a) +++OPTIONAL
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jlarmour
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diff changeset
463 // 2. resume(1a) +++OPTIONAL
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jlarmour
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diff changeset
464 // [1a lock-fail] thread 3->prio := 8
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diff changeset
465 //
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466 // [3. runs maybe, does the looping thing]
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467 //
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468 // 2. sleep a while...
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jlarmour
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469 //
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470 // [2a lock-fail] thread 3->prio := 12
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diff changeset
471 //
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jlarmour
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diff changeset
472 // [3. runs maybe, does the looping thing]
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jlarmour
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diff changeset
473 //
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jlarmour
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474 // [3a lock-fail] thread 3->prio unchanged
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jlarmour
parents:
diff changeset
475 //
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jlarmour
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diff changeset
476 // [3. runs maybe, does the looping thing]
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jlarmour
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diff changeset
477 //
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jlarmour
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diff changeset
478 // 2. lock scheduler
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jlarmour
parents:
diff changeset
479 // 2. set "go-flag"
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jlarmour
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diff changeset
480 // 2. resume(1)
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jlarmour
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diff changeset
481 // 2. resume(1a) +++OPTIONAL
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jlarmour
parents:
diff changeset
482 // 2. resume(2a) +++OPTIONAL
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jlarmour
parents:
diff changeset
483 // 2. resume(3a) +++OPTIONAL
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jlarmour
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diff changeset
484 // 2. unlock scheduler
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jlarmour
parents:
diff changeset
485 //
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486 // 1. runs, lock mutex - thread 3 has it locked
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diff changeset
487 //
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488 // 2. busy-waits a bit for thread 3 to come out of its delay() loop.
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diff changeset
489 // This must be a *busy*wait so that 3 can only run via the
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diff changeset
490 // inherited raised priority.
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diff changeset
491 //
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diff changeset
492 // [xa. all do the same: lock mutex, ]
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diff changeset
493 // [xa. unlock mutex ]
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494 // [xa. set a flag "extras"[x] to say we are done. ]
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jlarmour
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diff changeset
495 // [xa. exit ]
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jlarmour
parents:
diff changeset
496 //
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jlarmour
parents:
diff changeset
497 //
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jlarmour
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diff changeset
498 //
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499 // INHERIT
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jlarmour
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500 // -------
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diff changeset
501 //
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jlarmour
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502 // thread 3->prio := 5
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jlarmour
parents:
diff changeset
503 //
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diff changeset
504 // 3. runs,
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jlarmour
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diff changeset
505 // 3. set a flag to say "3-ran",
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jlarmour
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diff changeset
506 // 3. loop with a sleep(1) until "go-flag" is set.
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jlarmour
parents:
diff changeset
507 // 3. check "got it" is false,
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jlarmour
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diff changeset
508 // 3. then unlock mutex,
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jlarmour
parents:
diff changeset
509 //
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diff changeset
510 // thread 3->prio := 15
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diff changeset
511 //
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diff changeset
512 // 1. runs, set a flag to say "got it",
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jlarmour
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diff changeset
513 // 1. check "3-ended" flag is false
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jlarmour
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diff changeset
514 // 1. unlock mutex,
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jlarmour
parents:
diff changeset
515 // 1. check "3-ended" flag is still false
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jlarmour
parents:
diff changeset
516 // 1. exit.
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jlarmour
parents:
diff changeset
517 //
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jlarmour
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diff changeset
518 // [1a locks, unlocks, exits]
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jlarmour
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diff changeset
519 //
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jlarmour
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520 // 2. runs, check "3-ran" and "got it" flags are TRUE ****
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jlarmour
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diff changeset
521 // 2. check "3-ended" flag is false
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jlarmour
parents:
diff changeset
522 // 2. sleeps for a while so that...
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jlarmour
parents:
diff changeset
523 //
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jlarmour
parents:
diff changeset
524 // [2a locks, unlocks, exits]
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jlarmour
parents:
diff changeset
525 //
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jlarmour
parents:
diff changeset
526 // 3. runs, set "3-ended" flag,
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jlarmour
parents:
diff changeset
527 // 3. check "3-ran" and "got it" flags
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jlarmour
parents:
diff changeset
528 // 3. exit
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jlarmour
parents:
diff changeset
529 //
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jlarmour
parents:
diff changeset
530 // [3a locks, unlocks, exits]
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jlarmour
parents:
diff changeset
531 //
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jlarmour
parents:
diff changeset
532 // 2. awakens, checks all flags true,
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jlarmour
parents:
diff changeset
533 // 2. check that all "extra" threads that we started have indeed run
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jlarmour
parents:
diff changeset
534 // 2. end of test.
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jlarmour
parents:
diff changeset
535 //
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jlarmour
parents:
diff changeset
536 //
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jlarmour
parents:
diff changeset
537 //
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jlarmour
parents:
diff changeset
538 //
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jlarmour
parents:
diff changeset
539 // NO-INHERIT
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jlarmour
parents:
diff changeset
540 // ----------
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jlarmour
parents:
diff changeset
541 // thread 1 is waiting on the mutex
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jlarmour
parents:
diff changeset
542 //
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jlarmour
parents:
diff changeset
543 // [1a lock-fail]
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jlarmour
parents:
diff changeset
544 //
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jlarmour
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diff changeset
545 // 2. runs, checks that "3-ran" and "got it" flags are FALSE ****
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jlarmour
parents:
diff changeset
546 // 2. check "3-ended" flag is false
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jlarmour
parents:
diff changeset
547 // 2. sleeps for a while so that...
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jlarmour
parents:
diff changeset
548 //
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jlarmour
parents:
diff changeset
549 // [2a. lock-fail]
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jlarmour
parents:
diff changeset
550 //
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jlarmour
parents:
diff changeset
551 // 3. runs, set a flag to say "3-ran",
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jlarmour
parents:
diff changeset
552 // 3. check "got it" is false,
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jlarmour
parents:
diff changeset
553 // 3. then unlock mutex,
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jlarmour
parents:
diff changeset
554 //
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jlarmour
parents:
diff changeset
555 // 1. runs, set a flag to say "got it",
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jlarmour
parents:
diff changeset
556 // 1. check "3-ended" flag is false
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jlarmour
parents:
diff changeset
557 // 1. unlock mutex,
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jlarmour
parents:
diff changeset
558 // 1. check "3-ended" flag is still false
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jlarmour
parents:
diff changeset
559 // 1. exit.
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jlarmour
parents:
diff changeset
560 //
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jlarmour
parents:
diff changeset
561 // [1a locks, unlocks, exits]
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jlarmour
parents:
diff changeset
562 // [2a locks, unlocks, exits]
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jlarmour
parents:
diff changeset
563 //
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jlarmour
parents:
diff changeset
564 // 3. runs, set "3-ended" flag,
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jlarmour
parents:
diff changeset
565 // 3. check "3-ran" and "got it" flags
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jlarmour
parents:
diff changeset
566 // 3. exit
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jlarmour
parents:
diff changeset
567 //
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jlarmour
parents:
diff changeset
568 // [3a locks, unlocks, exits]
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jlarmour
parents:
diff changeset
569 //
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jlarmour
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570 // 2. awakens, checks all flags true,
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571 // 2. check that all "extra" threads that we started have indeed run
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572 // 2. end of test.
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573 //
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574 //
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575 // (the end)
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576 //
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577 //
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578 // ------------------------------------------------------------------------
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579
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580 // EOF mutex3.cxx