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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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54
kernel/syscall.c
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@@ -326,46 +326,50 @@ rescan:
ihk_mc_spinlock_lock_noirq(&child_iter->lock);
if (child_iter->status == PS_ZOMBIE
&& (pid == -1 || pid == child_iter->pid)) {
if (pid == -1 || pid == child_iter->pid) {
child = child_iter;
ihk_mc_spinlock_unlock_noirq(&child_iter->lock);
break;
}
ihk_mc_spinlock_unlock_noirq(&child_iter->lock);
}
if (empty || (!child && pid != -1)) {
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
return -ECHILD;
}
/* If child is valid we are still holding its ftn->lock */
if (child) {
struct syscall_request request IHK_DMA_ALIGN;
if (child->status == PS_ZOMBIE) {
struct syscall_request request IHK_DMA_ALIGN;
dkprintf("wait: found PS_ZOMBIE process: %d\n", child->pid);
list_del(&child->siblings_list);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
if (status) {
*status = child->exit_status;
ihk_mc_spinlock_unlock_noirq(&child->lock);
dkprintf("wait: found PS_ZOMBIE process: %d\n", child->pid);
list_del(&child->siblings_list);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
if (status) {
*status = child->exit_status;
}
pid = child->pid;
release_fork_tree_node(child);
/* Ask host to clean up exited child */
request.number = __NR_wait4;
request.args[0] = pid;
request.args[1] = 0;
ret = do_syscall(&request, ctx, ihk_mc_get_processor_id(), 0);
if (ret != pid)
kprintf("WARNING: host waitpid failed?\n");
goto exit;
}
pid = child->pid;
release_fork_tree_node(child);
/* Ask host to clean up exited child */
request.number = __NR_wait4;
request.args[0] = pid;
request.args[1] = 0;
ret = do_syscall(&request, ctx, ihk_mc_get_processor_id(), 0);
if (ret != pid)
kprintf("WARNING: host waitpid failed?\n");
goto exit;
ihk_mc_spinlock_unlock_noirq(&child->lock);
}
/* Don't sleep if WNOHANG requested */