109 lines
No EOL
4 KiB
C
109 lines
No EOL
4 KiB
C
#include "configops.h"
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#include "metadataops.h"
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#include "StandardConstants.h"
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#include "simulator.h"
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/*
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Name: createProcessList
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Process: reads through the opcode struct to fill out the linked list of PCBs
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Function Input/Parameters: metadata (OpCodeType *)
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Function Output/Parameters: none
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Function Output/Returned: head pointer to the PCBs
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Device Input/Device: none
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Device Output/Device: none
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Dependencies: malloc, sizeof, ???
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*/
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ProcessControlBlockLL *createProcessList(OpCodeType *metadataPtr)
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{
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// allocate and create the ProcessControlBlockLL using malloc and size of
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ProcessControlBlockLL *headBlock;
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headBlock = malloc(sizeof(ProcessControlBlockLL));
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// set the head pointer to NULL
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headBlock->headPtr = NULL;
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// return headBlock
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return headBlock;
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}
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/*
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Name: destroyProcessList
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Process: deallocates memory used for the linked list struct
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Function Input/Parameters: head pointer to linked list (ProcessControlBlockLL *)
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Function Output/Parameters: none
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Function Output/Returned: NULL
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Device Input/Device: none
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Device Output/Device: none
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Dependencies: free, destroyProcessListHelper, ???
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*/
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ProcessControlBlockLL *destroyProcessList(ProcessControlBlockLL *linkedListPtr)
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{
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// call the first destroyProcessListHelper
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destroyProcessListHelper(linkedListPtr->headPtr);
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// free the rest of the struct
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free(linkedListPtr);
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// return null
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return NULL;
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}
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/*
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Name: destroyProcessListHelper
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Process: recursively clears the PCB linked list struct, freeing the struct
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Function Input/Parameters: head pointer to linked list (ProcessControlBlockLL *)
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Function Output/Parameters: none
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Function Output/Returned: NULL
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Device Input/Device: none
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Device Output/Device: none
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Dependencies: free, destroyProcessListHelper(recursively), ???
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*/
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ProcessControlBlock *destroyProcessListHelper(ProcessControlBlock *nodePtr)
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{
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// check to see if the next pointer is NOT null
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if(nodePtr->nextPtr != NULL)
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{
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// if not null, move to the next pointer (recurse)
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nodePtr->nextPtr = destroyProcessListHelper(nodePtr->nextPtr);
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}
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// free the 'parent' node
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free(nodePtr);
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// return null
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return NULL;
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}
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/*
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Name: runSim
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Process: primary simulation driver
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Function Input/Parameters: configuration data (ConfigDataType *),
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metadata (OpCodeType *)
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Function Output/Parameters: none
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Function Output/Returned: none
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Device Input/Device: none
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Device Output/Device: none
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Dependencies: ???
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*/
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void runSim(ConfigDataType *configPtr, OpCodeType *metaDataMstrPtr)
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{
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// initialize function/variables
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// need a FILE * for file operations
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// need two working pointers, one for master loop, one for internal loop
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// currentTime variable that stores the time.
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// create the process list with createProcessList
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// function holds master loop, loops until sys end opcode found OR PCB List != NULL
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// will have a loop that goes from app start to app end for a PCB
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// (checks to see if the next instruction is NOT app end), using getNextProcess?
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// this will getNextOpCode
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// this will checkForIO and run the IO operations, outputting to FILE * and/or monitor
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// checkForIO will need the FILE * passed, will need timer access, and ???
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// this will checkForCPU and run the CPU operations, outputting to FILE * and/or monitor
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// checkForCPU will need the FILE * passed, will need timer access, and ???
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//
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// deallocate the process list with destroyProcessList
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printf("runSim called here");
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// void function, no return.
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}
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// getNextProcess/scheduler/dispatcher run here, loads/"runs" the process
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// getNextOpCode, not needed for Sim02 apparently, keep in mind.
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// checkForIO, I think this gets passed the current process and runs the IO ops
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// checkForCPU, I think this gets passed the current process and runs the CPU ops
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// checkForMemory, I think this gets passed the current process
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// and runs mem ops (not needed for Sim02)
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// cpuIdler (not needed for Sim02)
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