sanchayanmaity/xv6-cs450
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check p->killed for long-lived sleeps

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rsc 2007-08-08 10:29:42 +00:00
parent 1cb183a987
commit f2f062da61
3 changed files with 10 additions and 4 deletions
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8
console.c
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@ -6,6 +6,7 @@
#include "dev.h" #include "dev.h"
#include "param.h" #include "param.h"
#include "mmu.h" #include "mmu.h"
#include "proc.h"
struct spinlock console_lock; struct spinlock console_lock;
int panicked = 0; int panicked = 0;
@ -395,8 +396,13 @@ console_read(int minor, char *dst, int n)
target = n; target = n;
acquire(&kbd_lock); acquire(&kbd_lock);
while(n > 0){ while(n > 0){
while(kbd_r == kbd_w) while(kbd_r == kbd_w){
if(curproc[cpu()]->killed){
release(&kbd_lock);
return -1;
}
sleep(&kbd_r, &kbd_lock); sleep(&kbd_r, &kbd_lock);
}
c = kbd_buf[kbd_r++]; c = kbd_buf[kbd_r++];
if(c == C('D')){ // EOF if(c == C('D')){ // EOF
if(n < target){ if(n < target){

4
pipe.c
View file

@ -86,7 +86,7 @@ pipe_write(struct pipe *p, char *addr, int n)
for(i = 0; i < n; i++){ for(i = 0; i < n; i++){
while(((p->writep + 1) % PIPESIZE) == p->readp){ while(((p->writep + 1) % PIPESIZE) == p->readp){
if(p->readopen == 0){ if(p->readopen == 0 || curproc[cpu()]->killed){
release(&p->lock); release(&p->lock);
return -1; return -1;
} }
@ -110,7 +110,7 @@ pipe_read(struct pipe *p, char *addr, int n)
acquire(&p->lock); acquire(&p->lock);
while(p->readp == p->writep){ while(p->readp == p->writep){
if(p->writeopen == 0){ if(p->writeopen == 0 || curproc[cpu()]->killed){
release(&p->lock); release(&p->lock);
return 0; return 0;
} }

2
proc.c
View file

@ -405,7 +405,7 @@ proc_wait(void)
} }
// No point waiting if we don't have any children. // No point waiting if we don't have any children.
if(!havekids){ if(!havekids || cp->killed){
release(&proc_table_lock); release(&proc_table_lock);
return -1; return -1;
} }