ngx_sched_yield    46 src/core/ngx_rwlock.c         ngx_sched_yield();
ngx_sched_yield    84 src/core/ngx_rwlock.c         ngx_sched_yield();
ngx_sched_yield   131 src/core/ngx_shmtx.c         ngx_sched_yield();
ngx_sched_yield    40 src/core/ngx_spinlock.c         ngx_sched_yield();
ngx_sched_yield   184 src/core/ngx_thread_pool.c             ngx_sched_yield();