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/*
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 <cerrno>
#include <cstring>
#include <pthread.h>
#include <sched.h>
#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/i18n.h"
#include "pbd/debug.h"
using namespace std;
using namespace PBD;
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 (const string& loop_name)
: EventLoop (loop_name)
, m_context(MainContext::get_default())
, run_loop_thread (0)
, request_channel (true)
{
base_ui_instance = this;
request_channel.set_receive_handler (sigc::mem_fun (*this, &BaseUI::request_handler));
/* derived class must set _ok */
}
BaseUI::~BaseUI()
{
}
BaseUI::RequestType
BaseUI::new_request_type ()
{
RequestType rt;
/* XXX catch out-of-range */
rt = RequestType (rt_bit);
rt_bit <<= 1;
return rt;
}
int
BaseUI::set_thread_priority (const int policy, int priority) const
{
struct sched_param param;
memset (¶m, 0, sizeof (param));
/* POSIX requires a spread of at least 32 steps between min..max */
const int p_min = sched_get_priority_min (policy); // Linux: 1
const int p_max = sched_get_priority_max (policy); // Linux: 99
if (priority == 0) {
/* use default. XXX this should be relative to audio (JACK) thread,
* internal backends use -20 (Audio), -21 (MIDI), -22 (compuation)
*/
priority = 7;
}
if (priority > 0) {
priority += p_min;
} else {
priority += p_max;
}
if (priority > p_max) priority = p_max;
if (priority < p_min) priority = p_min;
param.sched_priority = priority;
return pthread_setschedparam (pthread_self(), SCHED_FIFO, ¶m);
}
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 ()
{
/* to be called by UI's that need/want their own distinct, self-created event loop thread.
*/
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);
}
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 (ioc & ~IO_IN) {
_main_loop->quit ();
}
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 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);
}
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