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-rw-r--r--kernel/proc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/proc.c b/kernel/proc.c
index 2d0ffa1..221f0f8 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -422,7 +422,7 @@ wait(uint64 addr)
}
// No point waiting if we don't have any children.
- if(!havekids || p->killed){
+ if(!havekids || __sync_add_and_fetch(&p->killed, 0)){
release(&wait_lock);
return -1;
}
@@ -588,7 +588,7 @@ kill(int pid)
for(p = proc; p < &proc[NPROC]; p++){
acquire(&p->lock);
if(p->pid == pid){
- p->killed = 1;
+ __sync_bool_compare_and_swap(&p->killed, 0, 1);
if(p->state == SLEEPING){
// Wake process from sleep().
p->state = RUNNABLE;