optimize: small optimization of ngx.worker.pids() .

Author: chronolaw

lib/resty/core/worker.lua

@@ -74,6 +74,8 @@ end
 
 if is_not_windows then
  if subsystem == "http" then
+ require "resty.core.phase" -- for ngx.get_phase
+
  ffi.cdef[[
  int ngx_http_lua_ffi_worker_pids(int *pids, size_t *pids_len);
  ]]
@@ -88,16 +90,18 @@ if is_not_windows then
  ngx_lua_ffi_worker_pids = C.ngx_stream_lua_ffi_worker_pids
  end
 
+ local ngx_phase = ngx.get_phase
 
  function ngx.worker.pids()
- if ngx.get_phase() == "init" or ngx.get_phase() == "init_worker" then
+ local phase = ngx_phase()
+ if phase == "init" or phase == "init_worker" then
  return nil, "API disabled in the current context"
  end
 
  local pids = {}
  local size_ptr = get_size_ptr()
  -- the old and the new workers coexist during reloading
- local worker_cnt = ngx.worker.count() * 4
+ local worker_cnt = ngx_lua_ffi_worker_count() * 4
  if worker_cnt == 0 then
  return pids
  end
@@ -117,6 +121,7 @@ if is_not_windows then
  end
 end
 
+
 function ngx.worker.id()
  local id = ngx_lua_ffi_worker_id()
  if id < 0 then