libs/pbd/base_ui.cc

   1 /*
   2     Copyright (C) 2000-2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <cstring>
  21 #include <stdint.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <cerrno>
  25 #include <cstring>
  26
  27 #include "pbd/base_ui.h"
  28 #include "pbd/pthread_utils.h"
  29 #include "pbd/error.h"
  30 #include "pbd/compose.h"
  31 #include "pbd/failed_constructor.h"
  32
  33 #include "i18n.h"
  34
  35 using namespace std;
  36 using namespace PBD;
  37 using namespace Glib;
  38
  39 uint64_t BaseUI::rt_bit = 1;
  40 BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
  41 BaseUI::RequestType BaseUI::Quit = BaseUI::new_request_type();
  42
  43 BaseUI::BaseUI (const string& str)
  44         : request_channel (true)
  45         , run_loop_thread (0)
  46         , _name (str)
  47 {
  48         base_ui_instance = this;
  49
  50         request_channel.ios()->connect (sigc::mem_fun (*this, &BaseUI::request_handler));
  51
  52         /* derived class must set _ok */
  53 }
  54
  55 BaseUI::~BaseUI()
  56 {
  57 }
  58
  59 BaseUI::RequestType
  60 BaseUI::new_request_type ()
  61 {
  62         RequestType rt;
  63
  64         /* XXX catch out-of-range */
  65
  66         rt = RequestType (rt_bit);
  67         rt_bit <<= 1;
  68
  69         return rt;
  70 }
  71
  72 void
  73 BaseUI::main_thread ()
  74 {
  75         set_event_loop_for_thread (this);
  76         thread_init ();
  77         _main_loop->run ();
  78 }
  79
  80 void
  81 BaseUI::run ()
  82 {
  83         /* to be called by UI's that need/want their own distinct, self-created event loop thread.
  84         */
  85
  86         _main_loop = MainLoop::create (MainContext::create());
  87         request_channel.ios()->attach (_main_loop->get_context());
  88
  89         /* glibmm hack - drop the refptr to the IOSource now before it can hurt */
  90         request_channel.drop_ios ();
  91
  92         run_loop_thread = Thread::create (mem_fun (*this, &BaseUI::main_thread), true);
  93 }
  94
  95 void
  96 BaseUI::quit ()
  97 {
  98         if (_main_loop->is_running()) {
  99                 _main_loop->quit ();
 100                 run_loop_thread->join ();
 101         }
 102 }
 103
 104 bool
 105 BaseUI::request_handler (Glib::IOCondition ioc)
 106 {
 107         /* check the transport request pipe */
 108
 109         if (ioc & ~IO_IN) {
 110                 _main_loop->quit ();
 111         }
 112
 113         if (ioc & IO_IN) {
 114                 request_channel.drain ();
 115
 116                 /* there may been an error. we'd rather handle requests first,
 117                    and then get IO_HUP or IO_ERR on the next loop.
 118                 */
 119
 120                 /* handle requests */
 121
 122                 handle_ui_requests ();
 123         }
 124
 125         return true;
 126 }
 127