Fields
- sigev_value: sigval
- sigev_signo: s32
- sigev_notify: s32
- _sigev_un: struct { _pad: [12] s32; #overlay (_pad) _tid: s32; #overlay (_pad) _sigev_thread: struct { _function: #type (unknown0: sigval) -> void #c_call; _attribute: *pthread_attr_t; }; }