ngx_mutex_trylock  112 os/unix/ngx_freebsd_rfork_thread.h #define ngx_mutex_trylock(m)  ngx_mutex_dolock(m, 1)
ngx_mutex_trylock  142 os/unix/ngx_pthread_thread.c ngx_mutex_trylock(ngx_mutex_t *m)
ngx_mutex_trylock  116 os/unix/ngx_thread.h #define ngx_mutex_trylock(m)  NGX_OK