NGX_RWLOCK_SPIN    32 src/core/ngx_rwlock.c             for (n = 1; n < NGX_RWLOCK_SPIN; n <<= 1) {
NGX_RWLOCK_SPIN    68 src/core/ngx_rwlock.c             for (n = 1; n < NGX_RWLOCK_SPIN; n <<= 1) {