3.1 finished

param.h

@@ -11,4 +11,4 @@
 #define LOGSIZE      (MAXOPBLOCKS*3)  // max data blocks in on-disk log
 #define NBUF         (MAXOPBLOCKS*3)  // size of disk block cache
 #define FSSIZE       1000  // size of file system in blocks
-
+#define QUANTUM      10 //number of ticks that cpu must  wait on current procces

trap.c

@@ -13,7 +13,7 @@ struct gatedesc idt[256];
 extern uint vectors[];  // in vectors.S: array of 256 entry pointers
 struct spinlock tickslock;
 uint ticks;
-
+int currentQuantom ; //show us how many quantom passed in this procces 
 void
 tvinit(void)
 {
@@ -102,8 +102,10 @@ trap(struct trapframe *tf)
 
   // Force process to give up CPU on clock tick.
   // If interrupts were on while locks held, would need to check nlock.
+  currentQuantom++;
   if(myproc() && myproc()->state == RUNNING &&
-     tf->trapno == T_IRQ0+IRQ_TIMER)
+     tf->trapno == T_IRQ0+IRQ_TIMER &&
+     currentQuantom%QUANTUM==0)
     yield();
 
   // Check if the process has been killed since we yielded