as of 2013-10-072013-10-07

3 files changed, 19 insertions, 19 deletions

diff --git a/comhan.c b/comhan.c
index 73b0c54..febb503 100644
--- a/comhan.c
+++ b/comhan.c
@@ -7,6 +7,7 @@
 

 #include <stdio.h>

 #include <string.h>

+#include <stdlib.h>

 #include "mpx.h"

 

 #define BUF_SIZE 80      /* Size of the command line buffer. */

@@ -79,7 +80,7 @@ void comhan() {
 int get_cmd(char cmd[]){

   /* return the number associated with a command (use STOP, HELP etc) */

 

-  int i =0 ; //loop control

+  int i = 0; //loop control

 

   if (cmd == NULL) {

 	return -1;

diff --git a/main.c b/main.c
index 9bd8b55..c6d567f 100644
--- a/main.c
+++ b/main.c
@@ -12,24 +12,23 @@ pcb * pcb_list;
 pcb * ready_queue;

 pcb * io_init_queue;

 

-int main(void) {

+pcb pcb0;

+pcb pcb1;

+pcb pcb2;

+pcb pcb3;

+pcb pcb4;

+pcb pcb5;

+pcb pcb6;

+pcb pcb7;

+pcb pcb8;

+pcb pcb9;

+pcb pcb10;

+pcb pcb11;

 

+int main(void) {

+	printf("Booting MPX... \n");

 	/* Put initialization code here */

 

-	// allocate memory for PCBs

-	pcb pcb0;

-	pcb pcb1;

-	pcb pcb2;

-	pcb pcb3;

-	pcb pcb4;

-	pcb pcb5;

-	pcb pcb6;

-	pcb pcb7;

-	pcb pcb8;

-	pcb pcb9;

-	pcb pcb10;

-	pcb pcb11;

-

 	// create the chain

 	pcb0.chain  = &pcb1;

 	pcb1.chain  = &pcb2;

@@ -59,8 +58,6 @@ int main(void) {
 

 	pcb_list = &pcb0;

 

-	printf("... booting MPX\n\n");

-

 	comhan();    /* Execute the command handler */

 

 	return 0;

diff --git a/pcb.c b/pcb.c
index 8cffe3f..8f4034a 100644
--- a/pcb.c
+++ b/pcb.c
@@ -146,7 +146,9 @@ int insert_pcb(pcb **queue, pcb * addr, int method) {
 	  current->next = addr;

 	  addr->next = one_after;

 	  addr->prev = current;

-	  one_after->prev = addr;

+	  if (one_after != NULL) {

+		one_after->prev = addr;

+	  }

 	} else {

 

 	  // otherwise, put it at the head