daemon/cmd_start_studio.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2009 Nedko Arnaudov <nedko@arnaudov.name>
   6  *
   7  **************************************************************************
   8  * This file contains implementation of the "start studio" command
   9  **************************************************************************
  10  *
  11  * LADI Session Handler is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * LADI Session Handler is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  23  * or write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "cmd.h"
  28 #include "studio_internal.h"
  29 #include "loader.h"
  30
  31 #define cmd_ptr ((struct ladish_command *)context)
  32
  33 static bool run(void * context)
  34 {
  35   bool jack_server_started;
  36   unsigned int app_count;
  37
  38   switch (cmd_ptr->state)
  39   {
  40   case LADISH_COMMAND_STATE_PENDING:
  41     if (studio_is_started())
  42     {
  43       log_info("Ignoring start request because studio is already started.");
  44       /* nothing to do, studio is already running */
  45       cmd_ptr->state = LADISH_COMMAND_STATE_DONE;
  46       return true;
  47     }
  48
  49     app_count = loader_get_app_count();
  50     if (app_count != 0)
  51     {
  52       log_error("Ignoring start request because there are apps running.");
  53       log_error("This could happen when JACK has crashed or when JACK stopped unexpectedly.");
  54       log_error("Save your work, then unload and reload the studio.");
  55       return false;
  56     }
  57
  58     log_info("Starting JACK server.");
  59
  60     ladish_graph_dump(g_studio.studio_graph);
  61
  62     if (!jack_proxy_start_server())
  63     {
  64       log_error("Starting JACK server failed.");
  65       return false;
  66     }
  67
  68     cmd_ptr->state = LADISH_COMMAND_STATE_WAITING;
  69     /* fall through */
  70   case LADISH_COMMAND_STATE_WAITING:
  71     if (!ladish_environment_consume_change(&g_studio.env_store, ladish_environment_jack_server_started, &jack_server_started))
  72     {
  73       /* we are still waiting for the JACK server start */
  74       ASSERT(!ladish_environment_get(&g_studio.env_store, ladish_environment_jack_server_started)); /* someone else consumed the state change? */
  75       return true;
  76     }
  77
  78     log_info("Wait for JACK server start complete.");
  79
  80     ASSERT(jack_server_started);
  81
  82     on_event_jack_started();    /* fetch configuration and announce start */
  83
  84     cmd_ptr->state = LADISH_COMMAND_STATE_DONE;
  85     return true;
  86   }
  87
  88   ASSERT_NO_PASS;
  89   return false;
  90 }
  91
  92 #undef cmd_ptr
  93
  94 bool ladish_command_start_studio(void * call_ptr, struct ladish_cqueue * queue_ptr)
  95 {
  96   struct ladish_command * cmd_ptr;
  97
  98   cmd_ptr = ladish_command_new(sizeof(struct ladish_command));
  99   if (cmd_ptr == NULL)
 100   {
 101     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_command_new() failed.");
 102     goto fail;
 103   }
 104
 105   cmd_ptr->run = run;
 106
 107   if (!ladish_cqueue_add_command(queue_ptr, cmd_ptr))
 108   {
 109     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_cqueue_add_command() failed.");
 110     goto fail_destroy_command;
 111   }
 112
 113   return true;
 114
 115 fail_destroy_command:
 116   free(cmd_ptr);
 117
 118 fail:
 119   return false;
 120 }