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uti: Allow only the first do_fork() call to create a uti thread

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This commit is contained in:
Masamichi Takagi
2018-03-20 14:08:37 +09:00
parent b6ab5911b7
commit dbba7dea18
1 changed files with 4 additions and 1 deletions
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5
kernel/syscall.c
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@ -2632,7 +2632,9 @@ retry_tid:
ihk_mc_syscall_ret(new->uctx) = 0;
new->status = PS_RUNNING;
if (old->mod_clone == SPAWN_TO_REMOTE) {
/* Only the first do_fork() call creates a thread on a Linux CPU */
if (__sync_bool_compare_and_swap(&old->mod_clone, SPAWN_TO_REMOTE, SPAWN_TO_LOCAL)) {
new->mod_clone = SPAWNING_TO_REMOTE;
if (old->mod_clone_arg) {
new->mod_clone_arg = kmalloc(sizeof(struct uti_attr),
@ -9164,6 +9166,7 @@ utilthr_migrate()
{
struct thread *thread = cpu_local_var(current);
/* Don't inherit mod_clone */
if (thread->mod_clone == SPAWNING_TO_REMOTE) {
thread->mod_clone = SPAWN_TO_LOCAL;
util_thread(thread->mod_clone_arg);