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wait4(): do not return ECHILD when child exists but not in PS_ZOMBIE state yet

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bgerofi@riken.jp
2014-09-05 18:28:15 +09:00
committed by Balazs Gerofi bgerofi@riken.jp
parent efc817de92
commit 0de6a30426
1 changed files with 29 additions and 25 deletions
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10
kernel/syscall.c
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@@ -326,10 +326,8 @@ rescan:
ihk_mc_spinlock_lock_noirq(&child_iter->lock); ihk_mc_spinlock_lock_noirq(&child_iter->lock);
if (child_iter->status == PS_ZOMBIE if (pid == -1 || pid == child_iter->pid) {
&& (pid == -1 || pid == child_iter->pid)) {
child = child_iter; child = child_iter;
ihk_mc_spinlock_unlock_noirq(&child_iter->lock);
break; break;
} }
@@ -341,9 +339,12 @@ rescan:
return -ECHILD; return -ECHILD;
} }
/* If child is valid we are still holding its ftn->lock */
if (child) { if (child) {
if (child->status == PS_ZOMBIE) {
struct syscall_request request IHK_DMA_ALIGN; struct syscall_request request IHK_DMA_ALIGN;
ihk_mc_spinlock_unlock_noirq(&child->lock);
dkprintf("wait: found PS_ZOMBIE process: %d\n", child->pid); dkprintf("wait: found PS_ZOMBIE process: %d\n", child->pid);
list_del(&child->siblings_list); list_del(&child->siblings_list);
@@ -368,6 +369,9 @@ rescan:
goto exit; goto exit;
} }
ihk_mc_spinlock_unlock_noirq(&child->lock);
}
/* Don't sleep if WNOHANG requested */ /* Don't sleep if WNOHANG requested */
if (options & WNOHANG) { if (options & WNOHANG) {
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock); ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);