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, 17 insertions, 15 deletions

diff --git a/src/nxt_php_sapi.c b/src/nxt_php_sapi.c
index d3c23c31..ddad5761 100644
--- a/src/nxt_php_sapi.c
+++ b/src/nxt_php_sapi.c
@@ -72,7 +72,7 @@ typedef void (*zif_handler)(INTERNAL_FUNCTION_PARAMETERS);
 #endif
 
 
-static nxt_int_t nxt_php_init(nxt_task_t *task, nxt_common_app_conf_t *conf);
+static nxt_int_t nxt_php_start(nxt_task_t *task, nxt_process_data_t *data);
 static nxt_int_t nxt_php_set_target(nxt_task_t *task, nxt_php_target_t *target,
     nxt_conf_value_t *conf);
 static void nxt_php_set_options(nxt_task_t *task, nxt_conf_value_t *options,
@@ -242,7 +242,7 @@ NXT_EXPORT nxt_app_module_t  nxt_app_module = {
     nxt_string("php"),
     PHP_VERSION,
     NULL,
-    nxt_php_init,
+    nxt_php_start,
 };
 
 
@@ -256,19 +256,20 @@ static void        ***tsrm_ls;
 
 
 static nxt_int_t
-nxt_php_init(nxt_task_t *task, nxt_common_app_conf_t *conf)
+nxt_php_start(nxt_task_t *task, nxt_process_data_t *data)
 {
-    u_char              *p;
-    uint32_t            next;
-    nxt_str_t           ini_path, name;
-    nxt_int_t           ret;
-    nxt_uint_t          n;
-    nxt_port_t          *my_port, *main_port;
-    nxt_runtime_t       *rt;
-    nxt_unit_ctx_t      *unit_ctx;
-    nxt_unit_init_t     php_init;
-    nxt_conf_value_t    *value;
-    nxt_php_app_conf_t  *c;
+    u_char                 *p;
+    uint32_t               next;
+    nxt_str_t              ini_path, name;
+    nxt_int_t              ret;
+    nxt_uint_t             n;
+    nxt_port_t             *my_port, *main_port;
+    nxt_runtime_t          *rt;
+    nxt_unit_ctx_t         *unit_ctx;
+    nxt_unit_init_t        php_init;
+    nxt_conf_value_t       *value;
+    nxt_php_app_conf_t     *c;
+    nxt_common_app_conf_t  *conf;
 
     static nxt_str_t  file_str = nxt_string("file");
     static nxt_str_t  user_str = nxt_string("user");
@@ -276,6 +277,7 @@ nxt_php_init(nxt_task_t *task, nxt_common_app_conf_t *conf)
 
     nxt_php_task = task;
 
+    conf = data->app;
     c = &conf->u.php;
 
     n = (c->targets != NULL) ? nxt_conf_object_members_count(c->targets) : 1;
@@ -385,7 +387,7 @@ nxt_php_init(nxt_task_t *task, nxt_common_app_conf_t *conf)
 
     nxt_fd_blocking(task, main_port->pair[1]);
 
-    php_init.ready_stream = my_port->process->init->stream;
+    php_init.ready_stream = my_port->process->stream;
 
     php_init.read_port.id.pid = my_port->pid;
     php_init.read_port.id.id = my_port->id;