Non-SFI mode: Add Linux asynchronous signal support

src/nonsfi/linux/linux_pthread_private.c

Index: src/nonsfi/linux/linux_pthread_private.c
diff --git a/src/nonsfi/linux/linux_pthread_private.c b/src/nonsfi/linux/linux_pthread_private.c
index 0cf3cd03d0c10076cf393720abfdd0bdbf0ab83b..9158be7178c31b3d82e6176ba8acf29465d9f44d 100644
--- a/src/nonsfi/linux/linux_pthread_private.c
+++ b/src/nonsfi/linux/linux_pthread_private.c
@@ -24,14 +24,16 @@ static uint32_t irt_return_call(uintptr_t result) {
 }
 
 static int nacl_irt_thread_create(void (*start_func)(void), void *stack,
-                                  void *thread_ptr) {
+                                  void *thread_ptr,
+                                  nacl_irt_tid_t *child_tid) {
   /*
    * We do not use CLONE_CHILD_CLEARTID as we do not want any
    * non-private futex signaling. Also, NaCl ABI does not require us
    * to signal the futex on stack_flag.
    */
   int flags = (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
-               CLONE_THREAD | CLONE_SYSVSEM | CLONE_SETTLS);
+               CLONE_THREAD | CLONE_SYSVSEM | CLONE_SETTLS |
+               CLONE_PARENT_SETTID);
   /*
    * linux_clone_wrapper expects start_func's type is "int (*)(void *)".
    * Although |start_func| has type "void (*)(void)", the type mismatching
@@ -40,7 +42,7 @@ static int nacl_irt_thread_create(void (*start_func)(void), void *stack,
    */
   return irt_return_call(linux_clone_wrapper(
       (uintptr_t) start_func, /* arg */ 0, flags, stack,
-      /* ptid */ NULL, thread_ptr, /* ctid */ NULL));
+      child_tid, thread_ptr, /* ctid */ NULL));
 }
 
 static void nacl_irt_thread_exit(int32_t *stack_flag) {
@@ -80,7 +82,7 @@ static int nacl_irt_thread_nice(const int nice) {
 }
 
 void __nc_initialize_interfaces(void) {
-  const struct nacl_irt_thread init = {
+  const struct nacl_irt_thread_v0_2 init = {
     nacl_irt_thread_create,
     nacl_irt_thread_exit,
     nacl_irt_thread_nice,