Refactor of process management.

The process abstraction has changed to:

  setup(task, process)
  start(task, process_data)
  prefork(task, process, mp)

The prefork() occurs in the main process right before fork.

The file src/nxt_main_process.c is completely free of process
specific logic.

The creation of a process now supports a PROCESS_CREATED state.  The
The setup() function of each process can set its state to either
created or ready.  If created, a MSG_PROCESS_CREATED is sent to main
process, where external setup can be done (required for rootfs under
container).

The core processes (discovery, controller and router) doesn't need
external setup, then they all proceeds to their start() function
straight away.

In the case of applications, the load of the module happens at the
process setup() time and The module's init() function has changed
to be the start() of the process.

The module API has changed to:

  setup(task, process, conf)
  start(task, data)

As a direct benefit of the PROCESS_CREATED message, the clone(2) of
processes using pid namespaces now doesn't need to create a pipe
to make the child block until parent setup uid/gid mappings nor it
needs to receive the child pid.

1 files changed, 12 insertions, 8 deletions

diff --git a/src/ruby/nxt_ruby.c b/src/ruby/nxt_ruby.c
index 417e2d8d..40f72f51 100644
--- a/src/ruby/nxt_ruby.c
+++ b/src/ruby/nxt_ruby.c
@@ -28,7 +28,8 @@ typedef struct {
 } nxt_ruby_rack_init_t;
 
 
-static nxt_int_t nxt_ruby_init(nxt_task_t *task, nxt_common_app_conf_t *conf);
+static nxt_int_t nxt_ruby_start(nxt_task_t *task,
+    nxt_process_data_t *data);
 static VALUE nxt_ruby_init_basic(VALUE arg);
 static nxt_int_t nxt_ruby_init_io(nxt_task_t *task);
 static VALUE nxt_ruby_rack_init(nxt_ruby_rack_init_t *rack_init);
@@ -78,21 +79,24 @@ NXT_EXPORT nxt_app_module_t  nxt_app_module = {
     nxt_string("ruby"),
     ruby_version,
     NULL,
-    nxt_ruby_init,
+    nxt_ruby_start,
 };
 
 
 static nxt_int_t
-nxt_ruby_init(nxt_task_t *task, nxt_common_app_conf_t *conf)
+nxt_ruby_start(nxt_task_t *task, nxt_process_data_t *data)
 {
-    int                   state, rc;
-    VALUE                 res;
-    nxt_unit_ctx_t        *unit_ctx;
-    nxt_unit_init_t       ruby_unit_init;
-    nxt_ruby_rack_init_t  rack_init;
+    int                    state, rc;
+    VALUE                  res;
+    nxt_unit_ctx_t         *unit_ctx;
+    nxt_unit_init_t        ruby_unit_init;
+    nxt_ruby_rack_init_t   rack_init;
+    nxt_common_app_conf_t  *conf;
 
     static char  *argv[2] = { (char *) "NGINX_Unit", (char *) "-e0" };
 
+    conf = data->app;
+
     RUBY_INIT_STACK
     ruby_init();
     ruby_options(2, argv);