3.3 before add sys_call

proc.c

@@ -336,24 +336,25 @@ scheduler(void)
     for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
       if(p->state != RUNNABLE)
         continue;
-
-      //choose highest priority 
-      struct proc* minimum = ptable.proc ;
-      for(p1 = ptable.proc ; p1 <&ptable.proc[NPROC];p1++){
-        if(p1->state != RUNNABLE){
-          continue;
+      if(cpuMode == 2){
+        //choose highest priority 
+        struct proc* minimum = ptable.proc ;
+        for(p1 = ptable.proc ; p1 <&ptable.proc[NPROC];p1++){
+          if(p1->state != RUNNABLE){
+            continue;
+          }
+          if(minimum->calculatedPriority > (p1->calculatedPriority)){
+            minimum = p1; 
+          }
         }
-        if(minimum->calculatedPriority > (p1->calculatedPriority)){
-          minimum = p1; 
+        minimum-> calculatedPriority += minimum ->priority;
+        
+        //for controling larg int and destroy negative priority
+        if(minimum->calculatedPriority<0){
+          minimum->calculatedPriority = 0;
         }
+        p = minimum;
       }
-      minimum-> calculatedPriority += minimum ->priority;
-      
-      //for controling larg int and destroy negative priority
-      if(minimum->calculatedPriority<0){
-        minimum->calculatedPriority = 0;
-      }
-      p = minimum;
       // Switch to chosen process.  It is the process's job
       // to release ptable.lock and then reacquire it
       // before jumping back to us.

proc.h

@@ -12,6 +12,8 @@ struct cpu {
 
 extern struct cpu cpus[NCPU];
 extern int ncpu;
+extern int cpuMode;// this field show how schedule system use
+
 
 //PAGEBREAK: 17
 // Saved registers for kernel context switches.

trap.c

@@ -105,7 +105,7 @@ trap(struct trapframe *tf)
   currentQuantom++;
   if(myproc() && myproc()->state == RUNNING &&
      tf->trapno == T_IRQ0+IRQ_TIMER &&
-     currentQuantom%QUANTUM==0)
+     (currentQuantom%QUANTUM==0 || cpuMode!= 1) )
     yield();
 
   // Check if the process has been killed since we yielded