sched_yield        90 os/unix/ngx_freebsd_rfork_thread.c             sched_yield();
sched_yield       406 os/unix/ngx_freebsd_rfork_thread.c                 sched_yield();
sched_yield       483 os/unix/ngx_freebsd_rfork_thread.c             sched_yield();
sched_yield        69 os/unix/ngx_process.h #define ngx_sched_yield()  sched_yield()