SIMPLEQ_FIRST 233 third_party/libevent/compat/sys/queue.h #define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head)) SIMPLEQ_FIRST 237 third_party/libevent/compat/sys/queue.h for((var) = SIMPLEQ_FIRST(head); \