Started scheduleProcess function, will pick up later.

+- simulator.c

Sim02/simulator.c

@@ -87,10 +87,10 @@ ProcessControlBlock *destroyProcessListHelper(ProcessControlBlock *nodePtr)
 /*
 Name: fillProcessList
 Process: iterates through the metadata LL, fills out each process as needed.
-(Linking is left to the calling function, returns a pointer to the filled struct)
+Function Input/Parameters: metadata (OpCodeType *),
-Function Input/Parameters: metadata (OpCodeType *)
+                           headPointer (ProcessControlBlockLL *)
 Function Output/Parameters: none
-Function Output/Returned: pointer to filled PCB (ProcessControlBlock *)
+Function Output/Returned: pointer to filled PCB (ProcessControlBlockLL *)
 Device Input/Device: none
 Device Output/Device: none
 Dependencies: ???
@@ -224,8 +224,8 @@ void runSim(ConfigDataType *configPtr, OpCodeType *metaDataMstrPtr)
         // currentTime variable that stores the time. [now unsure if needed]
         // need a variable for headPointer to point
     ProcessControlBlockLL *pcbList;
-        // string variable for nextCode
+        // string variable for nextCode, temp unused
-    char *nextCode;
+    // char *nextCode;
     // create the process list with createProcessList, store the pointed to address
     pcbList = createProcessList();
     // fill the process list given the metadata
@@ -263,6 +263,52 @@ void runSim(ConfigDataType *configPtr, OpCodeType *metaDataMstrPtr)
     // void function, no return.
 }
 
+/*
+Name: scheduleProcess
+Process: takes in the scheduling data, and then returns which process is to be ran
+Function Input/Parameters: head pointer of PCB List (ProcessControlBlockLL *),
+                           configuration data (ConfigDataType *)
+Function Output/Parameters: none
+Function Output/Returned: none
+Device Input/Device: none
+Device Output/Device: none
+Dependencies: ???
+*/
+int scheduleProcess(ProcessControlBlockLL *headPointer, ConfigDataType *configPtr)
+{
+    int returnPid = -1;
+    // switch case for each scheduling algorithm
+    switch (configPtr->cpuSchedCode)
+    {
+        case CPU_SCHED_FCFS_N_CODE:
+            // First Come, First Served, Non-preemptive Scheduling
+            // only one implemented for now. returns first process without fail.
+            // need to find whichever process is first, AND the state is NEW.
+            // will set the state to READY, return the pid of the process which
+                // was set to ready.
+            // ignores any process which has a state of TERMINATED
+            break;
+        case CPU_SCHED_FCFS_P_CODE:
+            // TODO: First Come, First Served, Preemptive Scheduling
+            break;
+        case CPU_SCHED_RR_P_CODE:
+            // TODO: Round Robin Scheduling
+            break;
+        case CPU_SCHED_SJF_N_CODE:
+            // TODO: Shortest Job First Scheduling
+            break;
+        case CPU_SCHED_SRTF_P_CODE:
+            // TODO: Shortest Run-time First Scheduling
+            break;
+    }
+    // return returnPid
+    return returnPid;
+}
+/*
+Current Note to programmer: do the scheduler, the runIO and runCPU functions, and then the FILE IO functions
+this is all that is left so far, hopefully not too bad.
+*/
+
 // getNextProcess/scheduler/dispatcher run here, loads/"runs" the process
 // getNextOpCode, not needed for Sim02 apparently, keep in mind.
 // checkForIO, I think this gets passed the current process and runs the IO ops

Sim02/simulator.h

@@ -133,9 +133,10 @@ ProcessControlBlock *destroyProcessListHelper(ProcessControlBlock *nodePtr);
 /*
 Name: fillProcessList
 Process: iterates through the metadata LL, fills out each process as needed.
-Function Input/Parameters: metadata (OpCodeType *)
+Function Input/Parameters: metadata (OpCodeType *),
+                           headPointer (ProcessControlBlockLL *)
 Function Output/Parameters: none
-Function Output/Returned: none
+Function Output/Returned: pointer to filled PCB (ProcessControlBlockLL *)
 Device Input/Device: none
 Device Output/Device: none
 Dependencies: ???
@@ -155,4 +156,16 @@ Dependencies: ???
 */
 void runSim(ConfigDataType *configPtr, OpCodeType *metaDataMstrPtr);
 
+/*
+Name: scheduleProcess
+Process: takes in the scheduling data, and then returns which process is to be ran
+Function Input/Parameters: head pointer of PCB List (ProcessControlBlockLL *)
+Function Output/Parameters: none
+Function Output/Returned: none
+Device Input/Device: none
+Device Output/Device: none
+Dependencies: ???
+*/
+int scheduleProcess(ProcessControlBlockLL *headPointer, ConfigDataType *configPtr);
+
 #endif // SIMULATORX