*) ngx_http_ephemeral

*) use preallocated terminal_posted_request

src/http/ngx_http.h

@@ -84,13 +84,17 @@ ngx_int_t ngx_http_find_server_conf(ngx_http_request_t *r);
 void ngx_http_update_location_config(ngx_http_request_t *r);
 void ngx_http_handler(ngx_http_request_t *r);
 void ngx_http_run_posted_requests(ngx_connection_t *c);
-ngx_int_t ngx_http_post_request(ngx_http_request_t *r);
+ngx_int_t ngx_http_post_request(ngx_http_request_t *r,
+    ngx_http_posted_request_t *pr);
 void ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc);
 
 void ngx_http_empty_handler(ngx_event_t *wev);
 void ngx_http_request_empty_handler(ngx_http_request_t *r);
 
 
+#define ngx_http_ephemeral(r)  (ngx_http_ephemeral_t *) (&r->uri_start)
+
+
 #define NGX_HTTP_LAST   1
 #define NGX_HTTP_FLUSH  2
 

src/http/ngx_http_core_module.c

@@ -2139,7 +2139,7 @@ ngx_http_subrequest(ngx_http_request_t *r,
 
     *psr = sr;
 
-    return ngx_http_post_request(sr);
+    return ngx_http_post_request(sr, NULL);
 }
 
 

src/http/ngx_http_postpone_filter_module.c

@@ -102,7 +102,7 @@ ngx_http_postpone_filter(ngx_http_request_t *r, ngx_chain_t *in)
 
             c->data = pr->request;
 
-            return ngx_http_post_request(pr->request);
+            return ngx_http_post_request(pr->request, NULL);
         }
 
         if (pr->out == NULL) {

src/http/ngx_http_request.c

@@ -1810,13 +1810,15 @@ ngx_http_run_posted_requests(ngx_connection_t *c)
 
 
 ngx_int_t
-ngx_http_post_request(ngx_http_request_t *r)
+ngx_http_post_request(ngx_http_request_t *r, ngx_http_posted_request_t *pr)
 {
-    ngx_http_posted_request_t  *pr, **p;
+    ngx_http_posted_request_t  **p;
 
-    pr = ngx_palloc(r->pool, sizeof(ngx_http_posted_request_t));
     if (pr == NULL) {
-        return NGX_ERROR;
+        pr = ngx_palloc(r->pool, sizeof(ngx_http_posted_request_t));
+        if (pr == NULL) {
+            return NGX_ERROR;
+        }
     }
 
     pr->request = r;
@@ -1965,7 +1967,7 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
             }
         }
 
-        if (ngx_http_post_request(pr) != NGX_OK) {
+        if (ngx_http_post_request(pr, NULL) != NGX_OK) {
             r->main->count++;
             ngx_http_terminate_request(r, 0);
             return;
@@ -2025,8 +2027,9 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
 static void
 ngx_http_terminate_request(ngx_http_request_t *r, ngx_int_t rc)
 {
-    ngx_http_cleanup_t  *cln;
-    ngx_http_request_t  *mr;
+    ngx_http_cleanup_t    *cln;
+    ngx_http_request_t    *mr;
+    ngx_http_ephemeral_t  *e;
 
     mr = r->main;
 
@@ -2054,9 +2057,10 @@ ngx_http_terminate_request(ngx_http_request_t *r, ngx_int_t rc)
             return;
         }
 
+        e = ngx_http_ephemeral(mr);
         mr->posted_requests = NULL;
         mr->write_event_handler = ngx_http_terminate_handler;
-        (void) ngx_http_post_request(mr);
+        (void) ngx_http_post_request(mr, &e->terminal_posted_request);
         return;
     }
 

src/http/ngx_http_request.h

@@ -510,6 +510,21 @@ struct ngx_http_request_s {
     /* used to parse HTTP headers */
 
     ngx_uint_t                        state;
+
+    ngx_uint_t                        header_hash;
+    ngx_uint_t                        lowcase_index;
+    u_char                            lowcase_header[NGX_HTTP_LC_HEADER_LEN];
+
+    u_char                           *header_name_start;
+    u_char                           *header_name_end;
+    u_char                           *header_start;
+    u_char                           *header_end;
+
+    /*
+     * a memory that can be reused after parsing a request line
+     * via ngx_http_ephemeral_t
+     */
+
     u_char                           *uri_start;
     u_char                           *uri_end;
     u_char                           *uri_ext;
@@ -523,20 +538,17 @@ struct ngx_http_request_s {
     u_char                           *host_end;
     u_char                           *port_start;
     u_char                           *port_end;
-    u_char                           *header_name_start;
-    u_char                           *header_name_end;
-    u_char                           *header_start;
-    u_char                           *header_end;
 
     unsigned                          http_minor:16;
     unsigned                          http_major:16;
-
-    ngx_uint_t                        header_hash;
-    ngx_uint_t                        lowcase_index;
-    u_char                            lowcase_header[NGX_HTTP_LC_HEADER_LEN];
 };
 
 
+typedef struct {
+    ngx_http_posted_request_t         terminal_posted_request;
+} ngx_http_ephemeral_t;
+
+
 extern ngx_http_header_t       ngx_http_headers_in[];
 extern ngx_http_header_out_t   ngx_http_headers_out[];