_r_a_i_s_e sends the signal _s_i_g to the calling thread. This is functionally
equivalent to calling _pppp_tttt_hhhh_rrrr_eeee_aaaa_dddd______kkkk_iiii_llll_llll_((((_pppp_tttt_hhhh_rrrr_eeee_aaaa_dddd______ssss_eeee_llll_ffff_((((_))))_,,,, _s_i_g_)))).