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1 /*
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2 * Copyright 2010 OpenSourceCodeStewardshipFoundation
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3 *
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4 * Licensed under BSD
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <malloc.h>
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10
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11 #include "VMS.h"
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12 #include "Queue_impl/BlockingQueue.h"
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13
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14
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15 //===========================================================================
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16 void
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17 shutdownFn( void *dummy, VirtProcr *dummy2 );
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18
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19 void
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20 create_sched_slots( MasterEnv *masterEnv );
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21
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22 //===========================================================================
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23
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24 /*Setup has two phases:
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25 * 1) Semantic layer first calls init_VMS, which creates masterEnv, and puts
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26 * the master virt procr into the work-queue, ready for first "call"
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27 * 2) Semantic layer then does its own init, which creates the seed virt
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28 * procr inside the semantic layer, ready to schedule it when
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29 * asked by the first run of the masterLoop.
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30 *
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31 *This part is bit weird because VMS really wants to be "always there", and
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32 * have applications attach and detach.. for now, this VMS is part of
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33 * the app, so the VMS system starts up as part of running the app.
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34 *
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35 *The semantic layer is isolated from the VMS internals by making the
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36 * semantic layer do setup to a state that it's ready with its
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37 * initial virt procrs, ready to schedule them to slots when the masterLoop
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38 * asks. Without this pattern, the semantic layer's setup would
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39 * have to modify slots directly to assign the initial virt-procrs, and put
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40 * them into the workQ itself, breaking the isolation completely.
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41 *
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42 *
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43 *The semantic layer creates the initial virt procr(s), and adds its
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44 * own environment to masterEnv, and fills in the pointers to
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45 * the requestHandler and slaveScheduler plug-in functions
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46 */
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47
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48 /*This allocates VMS data structures, populates the master VMSProc,
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49 * and master environment, and returns the master environment to the semantic
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50 * layer.
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51 */
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52 void
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53 VMS__init()
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54 { MasterEnv *masterEnv;
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55 CASQueueStruc *workQ;
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56
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57 //Make the central work-queue
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58 _VMSWorkQ = makeCASQ();
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59 workQ = _VMSWorkQ;
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60
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61 _VMSMasterEnv = malloc( sizeof(MasterEnv) );
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62 masterEnv = _VMSMasterEnv;
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63
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64 //create the master virtual processor
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65 masterEnv->masterVirtPr = VMS__create_procr( &masterLoop, masterEnv );
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66
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67 create_sched_slots( masterEnv );
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68
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69 //Set slot 0 to be the master virt procr & set flags just in case
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70 masterEnv->schedSlots[0]->needsProcrAssigned = FALSE; //says don't touch
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71 masterEnv->schedSlots[0]->workIsDone = FALSE; //says don't touch
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72 masterEnv->schedSlots[0]->procrAssignedToSlot = masterEnv->masterVirtPr;
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73 masterEnv->masterVirtPr->schedSlot = masterEnv->schedSlots[0];
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74
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75 //First core loop to start up gets this, which will schedule seed Pr
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76 //TODO: debug: check address of masterVirtPr
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77 writeCASQ( masterEnv->masterVirtPr, workQ );
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78
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79 numProcrsCreated = 1;
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80 }
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81
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82
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83 void
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84 create_sched_slots( MasterEnv *masterEnv )
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85 { SchedSlot **schedSlots, **filledSlots;
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86 int i;
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87
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88 schedSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
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89 filledSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
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90 masterEnv->schedSlots = schedSlots;
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91 masterEnv->filledSlots = filledSlots;
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92
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93 for( i = 0; i < NUM_SCHED_SLOTS; i++ )
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94 {
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95 schedSlots[i] = malloc( sizeof(SchedSlot) );
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96
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97 //Set state to mean "handling requests done, slot needs filling"
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98 schedSlots[i]->workIsDone = FALSE;
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99 schedSlots[i]->needsProcrAssigned = TRUE;
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100 }
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101 }
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102
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103
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104 /*Semantic layer calls this when it want the system to start running..
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105 *
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106 *This creates the core loops, pins them to physical cores, gives them the
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107 * pointer to the workQ, and starts them running.
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108 */
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109 void
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110 VMS__start()
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111 { int coreIdx;
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112
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113 //TODO: Save "orig" stack pointer and frame ptr -- restore in VMS__end()
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114 //Create the win threads that animate the core loops
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115 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
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116 {
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117 coreLoopThdParams[coreIdx] = (ThdParams *)malloc( sizeof(ThdParams) );
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118 coreLoopThdParams[coreIdx]->coreNum = coreIdx;
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119
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120 coreLoopThdHandles[coreIdx] =
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121 CreateThread ( NULL, // Security attributes
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122 0, // Stack size
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123 coreLoop,
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124 coreLoopThdParams[coreIdx],
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125 CREATE_SUSPENDED,
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126 &(coreLoopThdIds[coreIdx])
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127 );
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128 ResumeThread( coreLoopThdHandles[coreIdx] ); //starts thread
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129 }
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130 }
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131
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132
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133
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134 /*Create stack, then create __cdecl structure on it and put initialData and
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135 * pointer to the new structure instance into the parameter positions on
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136 * the stack
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137 *Then put function pointer into nextInstrPt -- the stack is setup in std
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138 * call structure, so jumping to function ptr is same as a GCC generated
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139 * function call
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140 *No need to save registers on old stack frame, because there's no old
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141 * animator state to return to --
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142 *
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143 */
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144 VirtProcr *
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145 VMS__create_procr( VirtProcrFnPtr fnPtr, void *initialData )
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146 { VirtProcr *newPr;
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147 char *stackLocs, *stackPtr;
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148
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149 newPr = malloc( sizeof(VirtProcr) );
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150 newPr->procrID = numProcrsCreated++;
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151 newPr->nextInstrPt = fnPtr;
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152 newPr->initialData = initialData;
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153
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154 //fnPtr takes two params -- void *initData & void *animProcr
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155 //alloc stack locations, make stackPtr be the highest addr minus room
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156 // for 2 params + return addr. Return addr (NULL) is in loc pointed to
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157 // by stackPtr, initData at stackPtr + 4 bytes, animatingPr just above
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158 stackLocs = malloc( VIRT_PROCR_STACK_SIZE );
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159 newPr->startOfStack = stackLocs;
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160 stackPtr = ( (char *)stackLocs + VIRT_PROCR_STACK_SIZE - 0x10 );
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161 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp
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162 *( (int *)stackPtr + 2 ) = (int) newPr; //rightmost param -- 32bit pointer
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163 *( (int *)stackPtr + 1 ) = (int) initialData; //next param to left
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164 newPr->stackPtr = stackPtr; //core loop will switch to this, then
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165 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr
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166
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167 return newPr;
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168 }
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169
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170
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171 /*there is a label inside this function -- save the addr of this label in
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172 * the callingPr struc, as the pick-up point from which to start the next
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173 * work-unit for that procr. If turns out have to save registers, then
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174 * save them in the procr struc too. Then do assembly jump to the CoreLoop's
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175 * "done with work-unit" label. The procr struc is in the request in the
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176 * slave that animated the just-ended work-unit, so all the state is saved
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177 * there, and will get passed along, inside the request handler, to the
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178 * next work-unit for that procr.
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179 */
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180 void
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181 VMS__suspend_procr( VirtProcr *callingPr )
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182 { void *jmpPt, *stackPtrAddr, *framePtrAddr, *coreLoopStackPtr;
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183 void *coreLoopFramePtr;
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184
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185 //The request to master will cause this suspended virt procr to get
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186 // scheduled again at some future point -- to resume, core loop jumps
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187 // to the resume point (below), which causes restore of saved regs and
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188 // "return" from this call.
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189 callingPr->nextInstrPt = &&ResumePt;
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190
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191 //return ownership of the virt procr and sched slot to Master virt pr
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192 callingPr->schedSlot->workIsDone = TRUE;
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193 // coreIdx = callingPr->coreAnimatedBy;
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194
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195 stackPtrAddr = &(callingPr->stackPtr);
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196 framePtrAddr = &(callingPr->framePtr);
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197
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198 jmpPt = callingPr->coreLoopStartPt;
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199 coreLoopFramePtr = callingPr->coreLoopFramePtr;//need this only
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200 coreLoopStackPtr = callingPr->coreLoopStackPtr;//shouldn't need -- safety
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201
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202 //Save the virt procr's stack and frame ptrs, restore coreloop's frame
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203 // ptr, then jump back to "start" of core loop
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204 //Note, GCC compiles to assembly that saves esp and ebp in the stack
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205 // frame -- so have to explicitly do assembly that saves to memory
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206 asm volatile("movl %0, %%eax; \
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207 movl %%esp, (%%eax); \
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208 movl %1, %%eax; \
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209 movl %%ebp, (%%eax); \
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210 movl %2, %%eax; \
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211 movl %3, %%esp; \
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212 movl %4, %%ebp; \
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213 jmp %%eax " \
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214 /* outputs */ : "=g" (stackPtrAddr), "=g" (framePtrAddr) \
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215 /* inputs */ : "g" (jmpPt), "g"(coreLoopStackPtr), "g"(coreLoopFramePtr)\
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216 /* clobber */ : "memory", "%eax", "%ebx", "%ecx", "%edx", "%edi","%esi" \
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217 ); //list everything as clobbered to force GCC to save all
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218 // live vars that are in regs on stack before this
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219 // assembly, so that stack pointer is correct, before jmp
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220
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221 ResumePt:
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222 return;
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223 }
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224
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225
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226
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227 /*This is equivalent to "jump back to core loop" -- it's mainly only used
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228 * just after adding dissipate request to a processor -- so the semantic
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229 * layer is the only place it will be seen and/or used.
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230 *
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231 *It does almost the same thing as suspend, except don't need to save the
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232 * stack nor set the nextInstrPt
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233 *
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234 *As of June 30, 2010 just implementing as a call to suspend -- just sugar
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235 */
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236 void
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237 VMS__return_from_fn( VirtProcr *animatingPr )
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238 {
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239 VMS__suspend_procr( animatingPr );
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240 }
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241
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242
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243 /*Not sure yet the form going to put "dissipate" in, so this is the third
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244 * possibility -- the semantic layer can just make a macro that looks like
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245 * a call to its name, then expands to a call to this.
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246 *
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247 *As of June 30, 2010 this looks like the top choice..
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248 *
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249 *This adds a request to dissipate, then suspends the processor so that the
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250 * request handler will receive the request. The request handler is what
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251 * does the work of freeing memory and removing the processor from the
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252 * semantic environment's data structures.
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253 *The request handler also is what figures out when to shutdown the VMS
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254 * system -- which causes all the core loop threads to die, and returns from
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255 * the call that started up VMS to perform the work.
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256 *
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257 *This form is a bit misleading to understand if one is trying to figure out
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258 * how VMS works -- it looks like a normal function call, but inside it
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259 * sends a request to the request handler and suspends the processor, which
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260 * jumps out of the VMS__dissipate_procr function, and out of all nestings
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261 * above it, transferring the work of dissipating to the request handler,
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262 * which then does the actual work -- causing the processor that animated
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263 * the call of this function to disappear and the "hanging" state of this
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264 * function to just poof into thin air -- the virtual processor's trace
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265 * never returns from this call, but instead the virtual processor's trace
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266 * gets suspended in this call and all the virt processor's state disap-
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267 * pears -- making that suspend the last thing in the virt procr's trace.
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268 */
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269 void
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270 VMS__dissipate_procr( VirtProcr *procrToDissipate )
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271 { VMSReqst *req;
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272
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273 req = malloc( sizeof(VMSReqst) );
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274 // req->virtProcrFrom = callingPr;
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275 req->reqType = dissipate;
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276 req->nextReqst = procrToDissipate->requests;
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277 procrToDissipate->requests = req;
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278
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279 VMS__suspend_procr( procrToDissipate );
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280 }
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281
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282
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283 /*This inserts the semantic-layer's request data into standard VMS carrier
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284 */
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285 inline void
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286 VMS__send_sem_request( void *semReqData, VirtProcr *callingPr )
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287 { VMSReqst *req;
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288
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289 req = malloc( sizeof(VMSReqst) );
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290 // req->virtProcrFrom = callingPr;
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291 req->reqType = semantic;
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292 req->semReqData = semReqData;
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293 req->nextReqst = callingPr->requests;
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294 callingPr->requests = req;
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295 }
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296
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297
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298 /*This creates a request of type "dissipate" -- which will cause the virt
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299 * processor's state and owned locations to be freed
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300 */
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301 inline void
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302 VMS__send_dissipate_request( VirtProcr *procrToDissipate )
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303 { VMSReqst *req;
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304
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305 req = malloc( sizeof(VMSReqst) );
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306 // req->virtProcrFrom = callingPr;
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307 req->reqType = dissipate;
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308 req->nextReqst = procrToDissipate->requests;
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309 procrToDissipate->requests = req;
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310 }
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311
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312
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Me@22
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313 //TODO: add a semantic-layer supplied "freer" for the semantic-data portion
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Me@22
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314 // of a request -- IE call with both a virt procr and a fn-ptr to request
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Me@22
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315 // freer (or maybe put request freer as a field in virt procr?)
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316 void
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Me@22
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317 VMS__remove_and_free_top_request( VirtProcr *procrWithReq )
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Me@22
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318 { VMSReqst *req;
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319
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320 req = procrWithReq->requests;
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321 procrWithReq->requests = procrWithReq->requests->nextReqst;
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322 free( req );
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323 }
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324
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Me@22
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325 /*This must be called by the request handler plugin -- it cannot be called
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Me@22
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326 * from the semantic library "dissipate processor" function -- instead, the
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Me@22
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327 * semantic layer has to generate a request for the plug-in to call this
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328 * function.
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329 *The reason is that this frees the virtual processor's stack -- which is
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330 * still in use inside semantic library calls!
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331 *
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332 *This frees or recycles all the state owned by and comprising the animating
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Me@22
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333 * virtual procr. It frees any state that was malloc'd by the VMS system
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Me@22
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334 * itself, and asks the VMS system to dis-own any VMS__malloc'd locations.
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Me@22
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335 *If the dissipated processor is the sole (remaining) owner of VMS__malloc'd
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Me@22
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336 * state, then that state gets freed (or sent to recycling) as a side-effect
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337 * of dis-owning it.
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338 */
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339 void
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Me@22
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340 VMS__free_procr_locs( VirtProcr *animatingPr )
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Me@22
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341 {
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Me@22
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342 //dis-own all locations owned by this processor, causing to be freed
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Me@22
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343 // any locations that it is (was) sole owner of
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Me@22
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344 //TODO: implement VMS__malloc system, including "give up ownership"
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Me@22
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345
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Me@22
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346 VMS__remove_and_free_top_request( animatingPr );
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347 free( animatingPr->startOfStack );
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Me@22
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348
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Me@22
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349 //NOTE: animatingPr->semanticData should either have been allocated
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Me@22
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350 // with VMS__malloc, or else freed in the request handler plug-in.
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Me@22
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351 //NOTE: initialData was given to the processor, so should either have
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Me@22
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352 // been alloc'd with VMS__malloc, or freed by the level above animPr.
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Me@22
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353 //So, all that's left to free here is the VirtProcr struc itself
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Me@22
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354 free( animatingPr );
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Me@22
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355 }
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Me@22
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356
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Me@22
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357
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Me@22
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358 /*The semantic layer figures out when the work is done ( perhaps by a call
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Me@22
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359 * in the application to "work all done", or perhaps all the virtual
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Me@22
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360 * processors have dissipated.. a.s.o. )
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Me@22
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361 *
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Me@22
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362 *The semantic layer is responsible for making sure all work has fully
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Me@22
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363 * completed before using this to shutdown the VMS system.
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Me@22
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364 *
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Me@22
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365 *After the semantic layer has determined it wants to shut down, the
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Me@22
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366 * next time the Master Loop calls the scheduler plug-in, the scheduler
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Me@22
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367 * then calls this function and returns the virtual processor it gets back.
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Me@22
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368 *
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Me@22
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369 *When the shut-down processor runs, it first frees all locations malloc'd to
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Me@22
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370 * the VMS system (that wasn't
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Me@22
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371 * specified as return-locations). Then it creates one core-loop shut-down
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Me@22
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372 * processor for each core loop and puts them all into the workQ. When a
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Me@22
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373 * core loop animates a core loop shut-down processor, it causes exit-thread
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Me@22
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374 * to run, and when all core loop threads have exited, then the "wait for
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Me@22
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375 * work to finish" in the main thread is woken, and the function-call that
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Me@22
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376 * started all the work returns.
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Me@22
|
377 *
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Me@22
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378 *The function animated by this processor performs the shut-down work.
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Me@22
|
379 */
|
|
Me@22
|
380 VirtProcr *
|
|
Me@22
|
381 VMS__create_the_shutdown_procr()
|
|
Me@22
|
382 {
|
|
Me@22
|
383 return VMS__create_procr( &shutdownFn, NULL );
|
|
Me@22
|
384 }
|
|
Me@22
|
385
|
|
Me@22
|
386
|
|
Me@22
|
387 /*This is the function run by the special "shut-down" processor
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|
Me@22
|
388 *
|
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Me@22
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389 *The _VMSMasterEnv is needed by this shut down function, so the "wait"
|
|
Me@22
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390 * function run in the main loop has to free it, and the thread-related
|
|
Me@22
|
391 * locations (coreLoopThdParams a.s.o.).
|
|
Me@22
|
392 *However, the semantic environment and all data malloc'd to VMS can be
|
|
Me@22
|
393 * freed here.
|
|
Me@22
|
394 *
|
|
Me@22
|
395 *NOTE: the semantic plug-in is expected to use VMS__malloc to get all the
|
|
Me@22
|
396 * locations it needs -- they will be automatically freed by the standard
|
|
Me@22
|
397 * "free all owned locations"
|
|
Me@22
|
398 *
|
|
Me@22
|
399 *Free any locations malloc'd to the VMS system (that weren't
|
|
Me@22
|
400 * specified as return-locations).
|
|
Me@22
|
401 *Then create one core-loop shut-down processor for each core loop and puts
|
|
Me@22
|
402 * them all into the workQ.
|
|
Me@22
|
403 */
|
|
Me@22
|
404 void
|
|
Me@22
|
405 shutdownFn( void *dummy, VirtProcr *animatingPr )
|
|
Me@8
|
406 { int coreIdx;
|
|
Me@14
|
407 VirtProcr *shutDownPr;
|
|
Me@22
|
408 CASQueueStruc *workQ = _VMSWorkQ;
|
|
Me@22
|
409
|
|
Me@22
|
410 //free all the locations owned within the VMS system
|
|
Me@22
|
411 //TODO: write VMS__malloc and free.. -- take the DKU malloc as starting pt
|
|
Me@22
|
412
|
|
Me@22
|
413 //make the core loop shut-down processors and put them into the workQ
|
|
Me@8
|
414 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
|
|
Me@8
|
415 {
|
|
Me@14
|
416 shutDownPr = VMS__create_procr( NULL, NULL );
|
|
Me@14
|
417 shutDownPr->nextInstrPt = _VMSMasterEnv->coreLoopShutDownPt;
|
|
Me@22
|
418 writeCASQ( shutDownPr, workQ );
|
|
Me@8
|
419 }
|
|
Me@22
|
420
|
|
Me@22
|
421 //This is an issue: the animating processor of this function may not
|
|
Me@22
|
422 // get its request handled before all the cores have shutdown.
|
|
Me@22
|
423 //TODO: after all the threads stop, clean out the MasterEnv, the
|
|
Me@22
|
424 // SemanticEnv, and the workQ before returning.
|
|
Me@22
|
425 VMS__send_dissipate_request( animatingPr );
|
|
Me@22
|
426 VMS__suspend_procr( animatingPr ); //will never come back from this
|
|
Me@12
|
427 }
|
|
Me@12
|
428
|
|
Me@12
|
429
|
|
Me@12
|
430
|
|
Me@12
|
431 inline TSCount getTSCount()
|
|
Me@12
|
432 { unsigned int low, high;
|
|
Me@12
|
433 TSCount out;
|
|
Me@12
|
434
|
|
Me@12
|
435 saveTimeStampCountInto( low, high );
|
|
Me@12
|
436 out = high;
|
|
Me@12
|
437 out = (out << 32) + low;
|
|
Me@12
|
438 return out;
|
|
Me@12
|
439 }
|
|
Me@12
|
440
|
