X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fbase_ui.cc;h=f22d83264ef08b1c5d4519bd06f16d3ea79c1e71;hb=659701c59b76bdcbfcf5c1b8ce8962eb3f6a1ca2;hp=d3c8d5e4c77ca436b2253fbce44ae8d52473a5f8;hpb=481f7c39655afec832ac10430dd61a3bb464aa58;p=ardour.git

diff --git a/libs/pbd/base_ui.cc b/libs/pbd/base_ui.cc
index d3c8d5e4c7..f22d83264e 100644
--- a/libs/pbd/base_ui.cc
+++ b/libs/pbd/base_ui.cc
@@ -1,47 +1,66 @@
+/*
+    Copyright (C) 2000-2007 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <cstring>
 #include <stdint.h>
+#ifdef COMPILER_MSVC
+#include <io.h>      // Microsoft's nearest equivalent to <unistd.h>
+#else
 #include <unistd.h>
+#endif
 #include <fcntl.h>
-#include <errno.h>
+#include <cerrno>
+#include <cstring>
+
+#include "pbd/base_ui.h"
+#include "pbd/debug.h"
+#include "pbd/pthread_utils.h"
+#include "pbd/error.h"
+#include "pbd/compose.h"
+#include "pbd/failed_constructor.h"
 
-#include <pbd/base_ui.h>
-#include <pbd/error.h>
-#include <pbd/compose.h>
-#include <pbd/failed_constructor.h>
+#include "pbd/i18n.h"
 
-#include "i18n.h"
+#include "pbd/debug.h"
 
 using namespace std;
 using namespace PBD;
-	
-uint32_t BaseUI::rt_bit = 1;
+using namespace Glib;
+
+uint64_t BaseUI::rt_bit = 1;
 BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
+BaseUI::RequestType BaseUI::Quit = BaseUI::new_request_type();
 
-BaseUI::BaseUI (string str, bool with_signal_pipe)
-	: _name (str)
+BaseUI::BaseUI (const string& loop_name)
+	: EventLoop (loop_name)
+	, m_context(MainContext::get_default())
+	, run_loop_thread (0)
+	, request_channel (true)
 {
-	/* odd pseudo-singleton semantics */
-
 	base_ui_instance = this;
+	request_channel.set_receive_handler (sigc::mem_fun (*this, &BaseUI::request_handler));
 
-	signal_pipe[0] = -1;
-	signal_pipe[1] = -1;
-
-	if (with_signal_pipe) {
-		if (setup_signal_pipe ()) {
-			throw failed_constructor ();
-		}
-	}
+	/* derived class must set _ok */
 }
 
 BaseUI::~BaseUI()
 {
-	if (signal_pipe[0] >= 0) {
-		close (signal_pipe[0]);
-	} 
-
-	if (signal_pipe[1] >= 0) {
-		close (signal_pipe[1]);
-	} 
 }
 
 BaseUI::RequestType
@@ -57,32 +76,87 @@ BaseUI::new_request_type ()
 	return rt;
 }
 
-int
-BaseUI::setup_signal_pipe ()
+void
+BaseUI::main_thread ()
+{
+	DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: event loop running in thread %2\n", event_loop_name(), pthread_name()));
+	set_event_loop_for_thread (this);
+	thread_init ();
+	_main_loop->get_context()->signal_idle().connect (sigc::mem_fun (*this, &BaseUI::signal_running));
+	_main_loop->run ();
+}
+
+bool
+BaseUI::signal_running ()
+{
+	Glib::Threads::Mutex::Lock lm (_run_lock);
+	_running.signal ();
+
+	return false; // don't call it again
+}
+
+void
+BaseUI::run ()
 {
-	/* setup the pipe that other threads send us notifications/requests
-	   through.
+	/* to be called by UI's that need/want their own distinct, self-created event loop thread.
 	*/
 
-	if (pipe (signal_pipe)) {
-		error << string_compose (_("%1-UI: cannot create error signal pipe (%2)"), _name, std::strerror (errno))
-		      << endmsg;
+	m_context = MainContext::create();
+	_main_loop = MainLoop::create (m_context);
+	attach_request_source ();
+
+	Glib::Threads::Mutex::Lock lm (_run_lock);
+	run_loop_thread = Glib::Threads::Thread::create (mem_fun (*this, &BaseUI::main_thread));
+	_running.wait (_run_lock);
+}
 
-		return -1;
+void
+BaseUI::quit ()
+{
+	if (_main_loop && _main_loop->is_running()) {
+		_main_loop->quit ();
+		run_loop_thread->join ();
 	}
+}
+
+bool
+BaseUI::request_handler (Glib::IOCondition ioc)
+{
+	/* check the request pipe */
 
-	if (fcntl (signal_pipe[0], F_SETFL, O_NONBLOCK)) {
-		error << string_compose (_("%1-UI: cannot set O_NONBLOCK on signal read pipe (%2)"), _name, std::strerror (errno))
-		      << endmsg;
-		return -1;
+	if (ioc & ~IO_IN) {
+		_main_loop->quit ();
 	}
 
-	if (fcntl (signal_pipe[1], F_SETFL, O_NONBLOCK)) {
-		error << string_compose (_("%1-UI: cannot set O_NONBLOCK on signal write pipe (%2)"), _name, std::strerror (errno))
-		      << endmsg;
-		return -1;
+	if (ioc & IO_IN) {
+		request_channel.drain ();
+
+		/* there may been an error. we'd rather handle requests first,
+		   and then get IO_HUP or IO_ERR on the next loop.
+		*/
+
+		/* handle requests */
+
+		DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: request handler\n", event_loop_name()));
+		handle_ui_requests ();
 	}
 
-	return 0;
+	return true;
+}
+
+void
+BaseUI::signal_new_request ()
+{
+	DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: signal_new_request\n", event_loop_name()));
+	request_channel.wakeup ();
 }
 
+/**
+ * This method relies on the caller having already set m_context
+ */
+void
+BaseUI::attach_request_source ()
+{
+	DEBUG_TRACE (DEBUG::EventLoop, string_compose ("%1: attach request source\n", event_loop_name()));
+	request_channel.attach (m_context);
+}