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         : run_loop_thread (0)
  45         , _name (str)
  46 {
  47         base_ui_instance = this;
  48
  49         request_channel.ios()->connect (sigc::mem_fun (*this, &BaseUI::request_handler));
  50
  51         /* derived class must set _ok */
  52 }
  53
  54 BaseUI::~BaseUI()
  55 {
  56 }
  57
  58 BaseUI::RequestType
  59 BaseUI::new_request_type ()
  60 {
  61         RequestType rt;
  62
  63         /* XXX catch out-of-range */
  64
  65         rt = RequestType (rt_bit);
  66         rt_bit <<= 1;
  67
  68         return rt;
  69 }
  70
  71 void
  72 BaseUI::main_thread ()
  73 {
  74         set_event_loop_for_thread (this);
  75         thread_init ();
  76         _main_loop->run ();
  77 }
  78
  79 void
  80 BaseUI::run ()
  81 {
  82         /* to be called by UI's that need/want their own distinct, self-created event loop thread.
  83         */
  84
  85         _main_loop = MainLoop::create (MainContext::create());
  86         request_channel.ios()->attach (_main_loop->get_context());
  87
  88         /* glibmm hack - drop the refptr to the IOSource now before it can hurt */
  89         request_channel.drop_ios ();
  90
  91         run_loop_thread = Thread::create (mem_fun (*this, &BaseUI::main_thread), true);
  92 }
  93
  94 void
  95 BaseUI::quit ()
  96 {
  97         if (_main_loop->is_running()) {
  98                 _main_loop->quit ();
  99                 run_loop_thread->join ();
 100         }
 101 }
 102
 103 bool
 104 BaseUI::request_handler (Glib::IOCondition ioc)
 105 {
 106         /* check the transport request pipe */
 107
 108         if (ioc & ~IO_IN) {
 109                 _main_loop->quit ();
 110         }
 111
 112         if (ioc & IO_IN) {
 113                 request_channel.drain ();
 114
 115                 /* there may been an error. we'd rather handle requests first,
 116                    and then get IO_HUP or IO_ERR on the next loop.
 117                 */
 118
 119                 /* handle requests */
 120
 121                 handle_ui_requests ();
 122         }
 123
 124         return true;
 125 }
 126