Using shared memory to send data via nxt_port.

Usage:
    b = nxt_port_mmap_get_buf(task, port, size);
    b->mem.free = nxt_cpymem(b->mem.free, data, size);
    nxt_port_socket_write(task, port, NXT_PORT_MSG_DATA, -1, 0, b);

src/nxt_master_process.c

@@ -80,14 +80,12 @@ nxt_master_process_port_create(nxt_task_t *task, nxt_runtime_t *rt)
     nxt_port_t     *port;
     nxt_process_t  *process;
 
-    process = nxt_runtime_new_process(rt);
+    process = nxt_runtime_process_get(rt, nxt_pid);
     if (nxt_slow_path(process == NULL)) {
         return NXT_ERROR;
     }
 
-    process->pid = nxt_pid;
-
-    port = nxt_array_zero_add(process->ports);
+    port = nxt_process_port_new(process);
     if (nxt_slow_path(port == NULL)) {
         return NXT_ERROR;
     }
@@ -97,8 +95,10 @@ nxt_master_process_port_create(nxt_task_t *task, nxt_runtime_t *rt)
         return ret;
     }
 
-    port->pid = nxt_pid;
     port->engine = 0;
+    port->type = NXT_PROCESS_MASTER;
+
+    nxt_runtime_port_add(rt, port);
 
     /*
      * A master process port.  A write port is not closed
@@ -220,17 +220,16 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
      * TODO: remove process, init, ports from array on memory and fork failures.
      */
 
-    process = nxt_runtime_new_process(rt);
+    process = nxt_runtime_process_new(rt);
     if (nxt_slow_path(process == NULL)) {
         return NXT_ERROR;
     }
 
     process->init = init;
+    master_process = rt->mprocess;
+    init->master_port = nxt_process_port_first(master_process);
 
-    master_process = rt->processes->elts;
-    init->master_port = master_process->ports->elts;
-
-    port = nxt_array_zero_add(process->ports);
+    port = nxt_process_port_new(process);
     if (nxt_slow_path(port == NULL)) {
         return NXT_ERROR;
     }
@@ -243,6 +242,7 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
     }
 
     port->engine = 0;
+    port->type = init->type;
 
     pid = nxt_process_create(task, init);
 
@@ -253,6 +253,11 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
 
     case 0:
         /* A worker process, return to the event engine work queue loop. */
+        process->pid = nxt_pid;
+        port->pid = nxt_pid;
+
+        nxt_runtime_process_add(rt, process);
+
         return NXT_AGAIN;
 
     default:
@@ -260,6 +265,8 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
         process->pid = pid;
         port->pid = pid;
 
+        nxt_runtime_process_add(rt, process);
+
         nxt_port_read_close(port);
         nxt_port_write_enable(task, port);
 
@@ -272,27 +279,23 @@ nxt_master_create_worker_process(nxt_task_t *task, nxt_runtime_t *rt,
 void
 nxt_master_stop_worker_processes(nxt_task_t *task, nxt_runtime_t *rt)
 {
-    nxt_uint_t     i, n, nprocesses, nports;
     nxt_port_t     *port;
     nxt_process_t  *process;
 
-    process = rt->processes->elts;
-    nprocesses = rt->processes->nelts;
+    nxt_runtime_process_each(rt, process)
+    {
+        if (nxt_pid != process->pid) {
+            process->init = NULL;
 
-    for (i = 0; i < nprocesses; i++) {
+            nxt_process_port_each(process, port) {
 
-        if (nxt_pid != process[i].pid) {
-            process[i].init = NULL;
+                (void) nxt_port_socket_write(task, port, NXT_PORT_MSG_QUIT,
+                                             -1, 0, 0, NULL);
 
-            port = process[i].ports->elts;
-            nports = process[i].ports->nelts;
-
-            for (n = 0; n < nports; n++) {
-                (void) nxt_port_socket_write(task, &port[n], NXT_PORT_MSG_QUIT,
-                                             -1, 0, NULL);
-            }
+            } nxt_process_port_loop;
         }
     }
+    nxt_runtime_process_loop;
 }
 
 
@@ -331,7 +334,7 @@ nxt_master_process_sigusr1_handler(nxt_task_t *task, void *obj, void *data)
     nxt_int_t       ret;
     nxt_uint_t      n;
     nxt_file_t      *file, *new_file;
-    nxt_runtime_t     *rt;
+    nxt_runtime_t   *rt;
     nxt_array_t     *new_files;
     nxt_mem_pool_t  *mp;
 
@@ -473,39 +476,29 @@ nxt_master_process_sigchld_handler(nxt_task_t *task, void *obj, void *data)
 static void
 nxt_master_cleanup_worker_process(nxt_task_t *task, nxt_pid_t pid)
 {
-    nxt_uint_t          i, n;
     nxt_runtime_t       *rt;
     nxt_process_t       *process;
     nxt_process_init_t  *init;
 
     rt = task->thread->runtime;
 
-    process = rt->processes->elts;
-    n = rt->processes->nelts;
+    process = nxt_runtime_process_find(rt, pid);
 
-    /* A process[0] is the master process. */
+    if (process) {
+        init = process->init;
 
-    for (i = 1; i < n; i++) {
+        /* TODO: free ports fds. */
 
-        if (pid == process[i].pid) {
-            init = process[i].init;
+        nxt_runtime_process_remove(rt, process);
 
-            /* TODO: free ports fds. */
+        if (nxt_exiting) {
 
-            nxt_array_remove(rt->processes, &process[i]);
-
-            if (nxt_exiting) {
-                nxt_debug(task, "processes %d", n);
-
-                if (n == 2) {
-                    nxt_runtime_quit(task);
-                }
-
-            } else if (init != NULL) {
-                (void) nxt_master_create_worker_process(task, rt, init);
+            if (rt->nprocesses == 2) {
+                nxt_runtime_quit(task);
             }
 
-            return;
+        } else if (init != NULL) {
+            (void) nxt_master_create_worker_process(task, rt, init);
         }
     }
 }