在中断中执行对count和ncount计数的过程

myinterrupt.c

@@ -1,154 +1,74 @@
 /*
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  *  linux/mykernel/myinterrupt.c
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  *
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  *  Kernel internal my_timer_handler
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  *
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  *  Copyright (C) 2013  Mengning
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  *
-
  */
 
 #include <linux/types.h>
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 #include <linux/string.h>
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 #include <linux/ctype.h>
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 #include <linux/tty.h>
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 #include <linux/vmalloc.h>
 
-
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 #include "mypcb.h"
 
 extern tPCB task[MAX_TASK_NUM];
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 extern tPCB * my_current_task;
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 extern int task_count;
 
-
-
-
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 extern int count ;
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 extern int semaphore;
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 extern int ncount;
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 extern int intecount;
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-
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 extern void nonmutex(int);
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-
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 extern int mutex(int);
 
 /*
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  * Called by timer interrupt.
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  * it runs in the name of current running process,
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  * so it use kernel stack of current running process
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  */
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-//int icount = 0;
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 int miscount = 0;
 
-
-
-
-
 void my_timer_handler(void)
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 {
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 	tPCB * next;
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 	tPCB * prev;
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 	nonmutex(100000);
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 	int isgetin = mutex(100000);
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 	intecount ++;
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 	miscount += (1-isgetin);
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 	if(0 == isgetin)printk(KERN_NOTICE "I get in mutex %d times\n",miscount);
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 //	printk(KERN_NOTICE ">>>my_timer_handler here<<<\n");
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 //	printk(KERN_NOTICE "count = %d, ncount = %d \n",count,ncount);
-
-
-
-	if(my_current_task == NULL || my_current_task->next == NULL)
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-	{
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+	if(my_current_task == NULL || my_current_task->next == NULL){
 		return;
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 	}
 
     /* schedule */
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     next = my_current_task->next;
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     prev = my_current_task;
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     if(next->state == 0)/* -1 unrunnable, 0 runnable, >0 stopped */
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     {
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 //        printk(KERN_NOTICE ">>>switch %d to %d<<<\n",prev->pid,next->pid);
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     	/* switch to next process */
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     	asm volatile(	
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         	"pushl %%ebp\n\t" 	    /* save ebp */
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         	"movl %%esp,%0\n\t" 	/* save esp */
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         	"movl %2,%%esp\n\t"     /* restore  esp */
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         	"movl $1f,%1\n\t"       /* save eip */	
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         	"pushl %3\n\t" 
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         	"ret\n\t" 	            /* restore  eip */
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         	"1:\t"                  /* next process start here */
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         	"popl %%ebp\n\t"
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         	: "=m" (prev->thread.sp),"=m" (prev->thread.ip)
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         	: "m" (next->thread.sp),"m" (next->thread.ip)
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     	); 
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     	my_current_task = next;
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     }
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-
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     return;	
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 }