as of 2013-12-062013-12-06

1 files changed, 21 insertions, 8 deletions

diff --git a/sys_sppt.c b/sys_sppt.c
index c5b784e..6c4923c 100644
--- a/sys_sppt.c
+++ b/sys_sppt.c
@@ -44,9 +44,11 @@ void sys_init()
 

 void sys_exit()

 {

+  disable();

   // restore the clock

   clock_close();

 

+  // close IO devices

   com_close();

   con_close();

   prt_close();

@@ -54,6 +56,7 @@ void sys_exit()
   /* restore interrupt vector 60 and exit */

   setvect(0x60,vect60);

 

+  enable();

   exit();

 }

 

@@ -62,22 +65,33 @@ void interrupt dispatch()
 {

  disable();

  if (DEBUG_PRINTS) {printf("in dispatch \n ");}

- // TODO fix this.. .cop is null when we start

+

  cop = ready_queue_locked;

 

+ // kill zombie processes

+ while (cop->state == ZOMBIE) {

+   remove_pcb(&ready_queue_locked, cop);

+   freemem(cop->loadaddr);

+   free_pcb(pcb_list, cop);

+   cop = ready_queue_locked;

+ }

+

  // skip over suspended processes

  while (cop != NULL && cop->suspend == SUSPENDED) {

    cop = cop -> next;

  }

+

  if (DEBUG_PRINTS){

- if (cop == NULL) {

-   printf("!!cop null?!!!\n");

- } else {

-   printf("cop - %s\n", cop->name);

- }

+   if (cop == NULL) {

+	 printf("!!cop null?!!!\n");

+   } else {

+	 printf("cop - %s\n", cop->name);

+   }

  }

 

  remove_pcb(&ready_queue_locked, cop);

+ cop->state = RUNNING;

+

  enable();

  _SP = cop -> stack_ptr;

 

@@ -104,10 +118,9 @@ void interrupt sys_call()
 

 	// find out if the process wants to die... and kill it

 	if (parm_add->op_number == EXIT_CODE) {

-	  strcpy(cop->name,"averill");

-	  //TODO: CHECK IF THE PCB HAS IO PENDING

 	  freemem(cop->loadaddr);

 	  free_pcb(pcb_list, cop);

+	  // NOTE: the process just made this sys_req so it cannot have any io

 	} else {

 	  IO_sched(cop);

 	}