sigset_t *context_sigmask = os_context_sigmask_addr(context);
if (!deferrables_blocked_p(context_sigmask)) {
thread_sigmask(SIG_SETMASK, context_sigmask, 0);
sigset_t *context_sigmask = os_context_sigmask_addr(context);
if (!deferrables_blocked_p(context_sigmask)) {
thread_sigmask(SIG_SETMASK, context_sigmask, 0);