Mem pool cleanup introduced.

Used for connection mem pool cleanup, which can be used by buffers.
Used for port mem pool to safely destroy linked process.

src/nxt_main.h

@@ -10,6 +10,20 @@
 
 #include <nxt_auto_config.h>
 
+typedef struct nxt_port_s            nxt_port_t;
+typedef struct nxt_task_s            nxt_task_t;
+typedef struct nxt_port_recv_msg_s   nxt_port_recv_msg_t;
+typedef void (*nxt_port_handler_t)(nxt_task_t *task, nxt_port_recv_msg_t *msg);
+typedef struct nxt_sig_event_s       nxt_sig_event_t;
+typedef struct nxt_runtime_s         nxt_runtime_t;
+
+typedef struct nxt_thread_s          nxt_thread_t;
+typedef struct nxt_event_engine_s    nxt_event_engine_t;
+typedef struct nxt_log_s             nxt_log_t;
+typedef struct nxt_thread_pool_s     nxt_thread_pool_t;
+
+typedef void (*nxt_work_handler_t)(nxt_task_t *task, void *obj, void *data);
+
 #include <nxt_unix.h>
 #include <nxt_clang.h>
 #include <nxt_types.h>
@@ -17,19 +31,8 @@
 #include <nxt_mp.h>
 #include <nxt_array.h>
 
-typedef struct nxt_port_s            nxt_port_t;
-typedef struct nxt_task_s            nxt_task_t;
-typedef struct nxt_port_recv_msg_s   nxt_port_recv_msg_t;
-typedef void (*nxt_port_handler_t)(nxt_task_t *task, nxt_port_recv_msg_t *msg);
-typedef struct nxt_sig_event_s       nxt_sig_event_t;
-typedef struct nxt_runtime_s         nxt_runtime_t;
 typedef uint16_t                     nxt_port_id_t;
 
-typedef struct nxt_thread_s          nxt_thread_t;
-typedef struct nxt_event_engine_s    nxt_event_engine_t;
-typedef struct nxt_log_s             nxt_log_t;
-typedef struct nxt_thread_pool_s     nxt_thread_pool_t;
-
 #include <nxt_queue.h>
 
 #include <nxt_thread_id.h>

src/nxt_master_process.c

@@ -212,13 +212,13 @@ nxt_master_process_port_create(nxt_task_t *task, nxt_runtime_t *rt)
         return NXT_ERROR;
     }
 
-    nxt_process_port_add(process, port);
-
     ret = nxt_port_socket_init(task, port, 0);
     if (nxt_slow_path(ret != NXT_OK)) {
         return ret;
     }
 
+    nxt_process_port_add(task, process, port);
+
     nxt_runtime_port_add(rt, port);
 
     /*
@@ -380,12 +380,11 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
         return NXT_ERROR;
     }
 
-    nxt_process_port_add(process, port);
+    nxt_process_port_add(task, process, port);
 
     ret = nxt_port_socket_init(task, port, 0);
     if (nxt_slow_path(ret != NXT_OK)) {
         nxt_mp_release(port->mem_pool, port);
-        nxt_runtime_process_destroy(rt, process);
         return ret;
     }
 

src/nxt_mp.c

@@ -114,6 +114,8 @@ struct nxt_mp_s {
     nxt_tid_t            tid;
 #endif
 
+    nxt_work_t           *cleanup;
+
     /* Lists of nxt_mp_page_t. */
     nxt_queue_t          free_pages;
     nxt_queue_t          nget_pages;
@@ -283,6 +285,7 @@ void
 nxt_mp_destroy(nxt_mp_t *mp)
 {
     void               *p;
+    nxt_work_t         *work, *next_work;
     nxt_mp_block_t     *block;
     nxt_rbtree_node_t  *node, *next;
 
@@ -290,6 +293,15 @@ nxt_mp_destroy(nxt_mp_t *mp)
 
     nxt_mp_thread_assert(mp);
 
+    while (mp->cleanup != NULL) {
+        work = mp->cleanup;
+        next_work = work->next;
+
+        work->handler(work->task, work->obj, work->data);
+
+        mp->cleanup = next_work;
+    }
+
     next = nxt_rbtree_root(&mp->blocks);
 
     while (next != nxt_rbtree_sentinel(&mp->blocks)) {
@@ -1022,3 +1034,27 @@ nxt_mp_zget(nxt_mp_t *mp, size_t size)
 
     return p;
 }
+
+
+nxt_int_t
+nxt_mp_cleanup(nxt_mp_t *mp, nxt_work_handler_t handler,
+    nxt_task_t *task, void *obj, void *data)
+{
+    nxt_work_t  *work;
+
+    work = nxt_mp_get(mp, sizeof(nxt_work_t));
+
+    if (nxt_slow_path(work == NULL)) {
+        return NXT_ERROR;
+    }
+
+    work->next = mp->cleanup;
+    work->handler = handler;
+    work->task = task;
+    work->obj = obj;
+    work->data = data;
+
+    mp->cleanup = work;
+
+    return NXT_OK;
+}

src/nxt_mp.h

@@ -109,6 +109,10 @@ NXT_EXPORT void *nxt_mp_zget(nxt_mp_t *mp, size_t size)
     NXT_MALLOC_LIKE;
 
 
+NXT_EXPORT nxt_int_t nxt_mp_cleanup(nxt_mp_t *mp, nxt_work_handler_t handler,
+    nxt_task_t *task, void *obj, void *data);
+
+
 NXT_EXPORT void nxt_mp_thread_adopt(nxt_mp_t *mp);
 
 #endif /* _NXT_MP_H_INCLUDED_ */

src/nxt_port.c

@@ -245,7 +245,7 @@ nxt_port_new_port_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
         return;
     }
 
-    nxt_process_port_add(process, port);
+    nxt_process_port_add(task, process, port);
 
     port->pair[0] = -1;
     port->pair[1] = msg->fd;

src/nxt_process.c

@@ -563,11 +563,31 @@ nxt_user_cred_set(nxt_task_t *task, nxt_user_cred_t *uc)
 }
 
 
+static void
+nxt_process_port_mp_cleanup(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_runtime_t  *rt;
+    nxt_process_t  *process;
+
+    process = obj;
+    rt = data;
+
+    process->port_cleanups--;
+
+    if (process->port_cleanups == 0) {
+        nxt_runtime_process_destroy(rt, process);
+    }
+}
+
 void
-nxt_process_port_add(nxt_process_t *process, nxt_port_t *port)
+nxt_process_port_add(nxt_task_t *task, nxt_process_t *process, nxt_port_t *port)
 {
     port->process = process;
     nxt_queue_insert_tail(&process->ports, &port->link);
+
+    nxt_mp_cleanup(port->mem_pool, nxt_process_port_mp_cleanup, task, process,
+                   task->thread->runtime);
+    process->port_cleanups++;
 }
 
 

src/nxt_process.h

@@ -57,6 +57,7 @@ typedef struct {
     nxt_pid_t           pid;
     nxt_queue_t         ports;      /* of nxt_port_t */
     nxt_bool_t          ready;
+    nxt_uint_t          port_cleanups;
 
     nxt_process_init_t  *init;
 
@@ -88,7 +89,8 @@ NXT_EXPORT void nxt_process_arguments(nxt_task_t *task, char **orig_argv,
 #define nxt_process_port_first(process)                                       \
     nxt_queue_link_data(nxt_queue_first(&process->ports), nxt_port_t, link)
 
-NXT_EXPORT void nxt_process_port_add(nxt_process_t *process, nxt_port_t *port);
+NXT_EXPORT void nxt_process_port_add(nxt_task_t *task, nxt_process_t *process,
+    nxt_port_t *port);
 
 #define nxt_process_port_each(process, port)                                   \
     nxt_queue_each(port, &process->ports, nxt_port_t, link)

src/nxt_router.c

@@ -27,7 +27,6 @@ struct nxt_start_worker_s {
     nxt_app_t              *app;
     nxt_req_conn_link_t    *rc;
     nxt_mp_t               *mem_pool;
-    void                   *joint;
 
     nxt_work_t             work;
 };
@@ -161,16 +160,12 @@ static void
 nxt_router_sw_release(nxt_task_t *task, void *obj, void *data)
 {
     nxt_start_worker_t  *sw;
-    nxt_socket_conf_joint_t  *joint;
 
     sw = obj;
-    joint = sw->joint;
 
     nxt_debug(task, "sw #%uxD release", sw->stream);
 
-    if (nxt_mp_release(sw->mem_pool, sw) == 0) {
-        nxt_router_conf_release(task, joint);
-    }
+    nxt_mp_release(sw->mem_pool, sw);
 }
 
 
@@ -1861,7 +1856,6 @@ nxt_router_app_release_port(nxt_task_t *task, void *obj, void *data)
     nxt_app_t            *app;
     nxt_port_t           *port;
     nxt_work_t           *work;
-    nxt_process_t        *process;
     nxt_queue_link_t     *lnk;
     nxt_req_conn_link_t  *rc;
 
@@ -1913,14 +1907,9 @@ nxt_router_app_release_port(nxt_task_t *task, void *obj, void *data)
         nxt_router_app_free(app);
 
         port->app = NULL;
-        process = port->process;
 
         nxt_port_release(port);
 
-        if (nxt_queue_is_empty(&process->ports)) {
-            nxt_runtime_process_destroy(task->thread->runtime, process);
-        }
-
         return;
     }
 
@@ -2031,7 +2020,6 @@ nxt_router_app_port(nxt_task_t *task, nxt_req_conn_link_t *rc)
     sw->app = app;
     sw->rc = rc;
     sw->mem_pool = c->mem_pool;
-    sw->joint = c->listen->socket.data;
 
     sw->work.handler = nxt_router_send_sw_request;
     sw->work.task = task;
@@ -2349,6 +2337,17 @@ nxt_router_conn_close(nxt_task_t *task, void *obj, void *data)
 }
 
 
+static void
+nxt_router_conn_mp_cleanup(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_socket_conf_joint_t  *joint;
+
+    joint = obj;
+
+    nxt_router_conf_release(task, joint);
+}
+
+
 static void
 nxt_router_conn_free(nxt_task_t *task, void *obj, void *data)
 {
@@ -2380,9 +2379,9 @@ nxt_router_conn_free(nxt_task_t *task, void *obj, void *data)
 
     task = &task->thread->engine->task;
 
-    if (nxt_mp_release(c->mem_pool, c) == 0) {
-        nxt_router_conf_release(task, joint);
-    }
+    nxt_mp_cleanup(c->mem_pool, nxt_router_conn_mp_cleanup, task, joint, NULL);
+
+    nxt_mp_release(c->mem_pool, c);
 }
 
 

src/nxt_runtime.c

@@ -1491,6 +1491,8 @@ nxt_runtime_process_new(nxt_runtime_t *rt)
 void
 nxt_runtime_process_destroy(nxt_runtime_t *rt, nxt_process_t *process)
 {
+    nxt_assert(process->port_cleanups == 0);
+
     nxt_port_mmaps_destroy(process->incoming, 1);
     nxt_port_mmaps_destroy(process->outgoing, 1);
 
@@ -1657,6 +1659,10 @@ nxt_runtime_process_remove(nxt_runtime_t *rt, nxt_process_t *process)
     case NXT_OK:
         rt->nprocesses--;
 
+        if (process->port_cleanups == 0) {
+            nxt_runtime_process_destroy(rt, process);
+        }
+
         nxt_process_port_each(process, port) {
 
             nxt_runtime_port_remove(rt, port);
@@ -1665,10 +1671,6 @@ nxt_runtime_process_remove(nxt_runtime_t *rt, nxt_process_t *process)
 
         } nxt_process_port_loop;
 
-        if (nxt_queue_is_empty(&process->ports)) {
-            nxt_runtime_process_destroy(rt, process);
-        }
-
         break;
 
     default: