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do_wait: unlink child from children_list if child terminated

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refs #724
This commit is contained in:
Tomoki Shirasawa
2016-04-14 10:25:12 +09:00
parent d6784bb4a5
commit 3f2b4e7282
1 changed files with 24 additions and 3 deletions
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27
kernel/syscall.c
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@ -404,9 +404,11 @@ do_wait(int pid, int *status, int options, void *rusage)
if((options & WEXITED) &&
child->status == PS_ZOMBIE) {
ret = wait_zombie(thread, child, status, options);
mcs_rwlock_writer_unlock_noirq(&thread->proc->children_lock, &lock);
if(!(options & WNOWAIT)){
mcs_rwlock_writer_lock_noirq(&proc->update_lock, &lock);
struct mcs_rwlock_node updatelock;
struct mcs_rwlock_node childlock;
struct process *pid1 = cpu_local_var(resource_set)->pid1;
mcs_rwlock_writer_lock_noirq(&proc->update_lock, &updatelock);
ts_add(&proc->stime_children, &child->stime);
ts_add(&proc->utime_children, &child->utime);
ts_add(&proc->stime_children, &child->stime_children);
@ -415,9 +417,28 @@ do_wait(int pid, int *status, int options, void *rusage)
proc->maxrss_children = child->maxrss;
if(child->maxrss_children > proc->maxrss_children)
proc->maxrss_children = child->maxrss_children;
mcs_rwlock_writer_unlock_noirq(&proc->update_lock, &lock);
mcs_rwlock_writer_unlock_noirq(&proc->update_lock, &updatelock);
list_del(&child->siblings_list);
mcs_rwlock_writer_unlock_noirq(&proc->children_lock, &lock);
if(child->ptrace & PT_TRACED){
struct process *parent = child->ppid_parent;
mcs_rwlock_writer_lock_noirq(&parent->children_lock, &childlock);
list_del(&child->ptraced_siblings_list);
mcs_rwlock_writer_unlock_noirq(&parent->children_lock, &childlock);
}
mcs_rwlock_writer_lock_noirq(&child->update_lock, &updatelock);
child->ptrace = 0;
child->parent = pid1;
child->ppid_parent = pid1;
mcs_rwlock_writer_lock_noirq(&pid1->children_lock, &childlock);
list_add_tail(&child->siblings_list, &pid1->children_list);
mcs_rwlock_writer_unlock_noirq(&pid1->children_lock, &childlock);
mcs_rwlock_writer_unlock_noirq(&child->update_lock, &updatelock);
release_process(child);
}
else
mcs_rwlock_writer_unlock_noirq(&proc->children_lock, &lock);
goto out_found;
}