From 4447c70039ba1a3104bf229628699f33b8608973 Mon Sep 17 00:00:00 2001
From: simon <simon>
Date: Mon, 02 Dec 2002 10:25:36 +0000
Subject: - put a thread pipe between the xine callback handler and the receiver

  on qt side, to avoid problems like repaints from within a non-gui thread
---
(limited to 'noncore/multimedia/opieplayer2/threadutil.cpp')

diff --git a/noncore/multimedia/opieplayer2/threadutil.cpp b/noncore/multimedia/opieplayer2/threadutil.cpp
new file mode 100644
index 0000000..63863b4
--- a/dev/null
+++ b/noncore/multimedia/opieplayer2/threadutil.cpp
@@ -0,0 +1,284 @@
+/* This file is part of the KDE project
+   Copyright (C) 1999 Simon Hausmann <hausmann@kde.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+
+#include "threadutil.h"
+
+#include <qsocketnotifier.h>
+
+#include <pthread.h>
+#include <assert.h>
+#include <unistd.h>
+
+using namespace ThreadUtil;
+
+struct Mutex::Data
+{
+    Data()
+    {
+        pthread_mutex_init( &mutex, 0 );
+    }
+    ~Data()
+    {
+        pthread_mutex_destroy( &mutex );
+    }
+
+    pthread_mutex_t mutex;
+};
+
+Mutex::Mutex()
+    : d( new Data )
+{
+}
+
+Mutex::~Mutex()
+{
+    delete d;
+}
+
+void Mutex::lock()
+{
+    pthread_mutex_lock( &d->mutex );
+}
+
+void Mutex::unlock()
+{
+    pthread_mutex_unlock( &d->mutex );
+}
+
+bool Mutex::tryLock()
+{
+    return pthread_mutex_trylock( &d->mutex ) == 0;
+}
+
+bool Mutex::isLocked()
+{
+    if ( !tryLock() )
+        return true;
+
+    unlock();
+    return false;
+}
+
+struct WaitCondition::Data
+{
+    Data()
+    {
+        int result = pthread_cond_init( &waitCondition, 0 );
+        assert( result == 0 );
+    }
+    ~Data()
+    {
+        pthread_cond_destroy( &waitCondition );
+    }
+
+    pthread_cond_t waitCondition;
+};
+
+WaitCondition::WaitCondition()
+    : d( new Data )
+{
+}
+
+WaitCondition::~WaitCondition()
+{
+    delete d;
+}
+
+bool WaitCondition::wait()
+{
+    Mutex m;
+    m.lock();
+    return wait( m );
+}
+
+bool WaitCondition::wait( Mutex &mutex )
+{
+    return pthread_cond_wait( &d->waitCondition, &mutex.d->mutex );
+}
+
+void WaitCondition::wakeOne()
+{
+    pthread_cond_signal( &d->waitCondition );
+}
+
+void WaitCondition::wakeAll()
+{
+    pthread_cond_broadcast( &d->waitCondition );
+}
+
+OnewayNotifier::OnewayNotifier()
+{
+    int fds[ 2 ];
+    pipe( fds );
+    m_readFd = fds[ 0 ];
+    m_writeFd = fds[ 1 ];
+
+    m_notifier = new QSocketNotifier( m_readFd, QSocketNotifier::Read );
+    connect( m_notifier, SIGNAL( activated( int ) ),
+             this, SLOT( wakeUp() ) );
+}
+
+OnewayNotifier::~OnewayNotifier()
+{
+    delete m_notifier;
+
+    ::close( m_readFd );
+    ::close( m_writeFd );
+}
+
+void OnewayNotifier::notify()
+{
+    const char c = 42;
+    ::write( m_writeFd, &c, 1 );
+}
+
+void OnewayNotifier::wakeUp()
+{
+    char c = 0;
+
+    if ( ::read( m_readFd, &c, 1 ) != 1 )
+        return;
+
+    emit awake();
+}
+
+ChannelMessage::ChannelMessage( int type )
+    : m_type( type ), m_isCall( false ), m_replied( false ),
+      m_inEventHandler( false )
+{
+}
+
+ChannelMessage::~ChannelMessage()
+{
+    if ( m_guard.isLocked() )
+        m_guard.unlock();
+}
+
+void ChannelMessage::reply()
+{
+    if ( !m_isCall )
+    {
+        qDebug( "ChannelMessage::reply() - can't reply oneway message!" );
+        return;
+    }
+
+    if ( m_inEventHandler )
+    {
+        m_replied = true;
+        return;
+    }
+
+    m_condition.wakeOne();
+    m_guard.unlock();
+}
+
+struct Channel::Private
+{
+    Private()
+    {
+        ownerThread = pthread_self();
+    }
+
+    pthread_t ownerThread;
+};
+
+Channel::Channel( QObject *parent, const char *name )
+    : QObject( parent, name ), d( new Private )
+{
+    connect( &m_notifier, SIGNAL( awake() ),
+             this, SLOT( deliver() ) );
+}
+
+Channel::~Channel()
+{
+    delete d;
+}
+
+void Channel::send( ChannelMessage *message, SendType type )
+{
+    if ( type == WaitForReply )
+    {
+        message->m_guard.lock();
+        message->m_isCall = true;
+    }
+
+    m_pendingMessagesGuard.lock();
+    m_pendingMessages << MsgEnvelope( type, message );
+    m_pendingMessagesGuard.unlock();
+
+    if ( d->ownerThread == pthread_self() ) {
+        assert( type != WaitForReply );
+
+        deliver();
+    }
+    else
+        m_notifier.notify();
+    //QThread::postEvent( this, new QCustomEvent( QEvent::User, envelope ) );
+
+    if ( type == WaitForReply )
+    {
+        message->m_condition.wait( message->m_guard );
+        message->m_guard.unlock();
+    }
+}
+
+void Channel::deliver()
+{
+    AutoLock lock( m_pendingMessagesGuard );
+
+    while ( !m_pendingMessages.isEmpty() ) {
+        MsgEnvelope envelope = m_pendingMessages.first();
+
+        m_pendingMessages.remove( m_pendingMessages.begin() );
+
+        m_pendingMessagesGuard.unlock();
+        deliverOne( envelope );
+        m_pendingMessagesGuard.lock();
+    }
+}
+
+void Channel::deliverOne( const MsgEnvelope &envelope )
+{
+    ChannelMessage *msg = envelope.msg;
+
+    assert( msg );
+
+    if ( envelope.type == WaitForReply )
+    {
+        msg->m_guard.lock();
+        msg->m_inEventHandler = true;
+    }
+
+    receiveMessage( msg, envelope.type );
+
+    if ( envelope.type == WaitForReply )
+    {
+        msg->m_inEventHandler = false;
+        if ( msg->m_replied )
+        {
+            msg->m_condition.wakeOne();
+            // this is a bit tricky. we unlock only when we reply.
+            // reply() does an unlock as well.
+            msg->m_guard.unlock();
+        }
+    }
+}
+
+/* vim: et sw=4 ts=4
+ */
--
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