feat: enable threads for privileged agent (#72)

Signed-off-by: spacewander <[email protected]>

Author: spacewander

patch/1.21.4/nginx-privileged_agent_process_thread.patch

@@ -0,0 +1,14 @@
+diff --git src/core/ngx_thread_pool.c src/core/ngx_thread_pool.c
+index 7fb0f7f..95081a6 100644
+--- src/core/ngx_thread_pool.c
++++ src/core/ngx_thread_pool.c
+@@ -587,6 +587,9 @@ ngx_thread_pool_init_worker(ngx_cycle_t *cycle)
+     ngx_thread_pool_conf_t   *tcf;
+ 
+     if (ngx_process != NGX_PROCESS_WORKER
++#if HAVE_PRIVILEGED_PROCESS_PATCH
++        && !ngx_is_privileged_agent
++#endif
+         && ngx_process != NGX_PROCESS_SINGLE)
+     {
+         return NGX_OK;