Imbus/xv6-riscv-kernel
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Read and write p->killed using atomics

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This commit is contained in:
Frans Kaashoek 2022-08-10 20:35:42 -04:00
parent b1fd09335a
commit 4087a6e7fc
5 changed files with 9 additions and 9 deletions
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4
kernel/proc.c
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@ -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;