void signal_io (IDTYPE target, void * arg)
{
debug("detecting input, signaling thread %u\n", target);
struct shim_thread * thread = lookup_thread(target);
if (!thread)
return;
append_signal(thread, SIGIO, NULL, true);
}
void signal_alarm (IDTYPE target, void * arg)
{
debug("alarm goes off, signaling thread %u\n", target);
struct shim_thread * thread = lookup_thread(target);
if (!thread)
return;
append_signal(thread, SIGALRM, NULL, true);
}
int thread_exit(struct shim_thread * self, bool send_ipc)
{
/* Chia-Che: Broadcast exit message as early as possible,
so other process can start early on responding. */
if (self->in_vm && send_ipc)
ipc_cld_exit_send(self->ppid, self->tid, self->exit_code, self->term_signal);
lock(&self->lock);
if (!self->is_alive) {
debug("thread %d is dead\n", self->tid);
out:
unlock(&self->lock);
return 0;
}
#ifdef PROFILE
self->exit_time = GET_PROFILE_INTERVAL();
#endif
int exit_code = self->exit_code;
self->is_alive = false;
if (is_internal(self))
goto out;
struct shim_handle_map * handle_map = self->handle_map;
struct shim_handle * exec = self->exec;
struct shim_thread * parent = self->parent;
self->handle_map = NULL;
self->exec = NULL;
if (parent) {
assert(parent != self);
assert(parent->child_exit_event);
debug("thread exits, notifying thread %d\n", parent->tid);
lock(&parent->lock);
LISTP_DEL_INIT(self, &parent->children, siblings);
LISTP_ADD_TAIL(self, &parent->exited_children, siblings);
if (!self->in_vm) {
debug("deliver SIGCHLD (thread = %d, exitval = %d)\n",
self->tid, exit_code);
siginfo_t info;
memset(&info, 0, sizeof(siginfo_t));
info.si_signo = SIGCHLD;
info.si_pid = self->tid;
info.si_uid = self->uid;
info.si_status = (exit_code & 0xff) << 8;
append_signal(parent, SIGCHLD, &info, true);
}
unlock(&parent->lock);
DkEventSet(parent->child_exit_event);
} else {
debug("parent not here, need to tell another process\n");
ipc_cld_exit_send(self->ppid, self->tid, self->exit_code, self->term_signal);
}
struct robust_list_head * robust_list = (void *) self->robust_list;
self->robust_list = NULL;
unlock(&self->lock);
if (handle_map)
put_handle_map(handle_map);
if (exec)
put_handle(exec);
if (robust_list)
release_robust_list(robust_list);
if (self->clear_child_tid)
release_clear_child_id (self->clear_child_tid);
DkEventSet(self->exit_event);
return 0;
}
