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-rw-r--r--src/gui/embedded/qlock.cpp325
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diff --git a/src/gui/embedded/qlock.cpp b/src/gui/embedded/qlock.cpp
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index bb442e4aaf..0000000000
--- a/src/gui/embedded/qlock.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtGui module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** GNU Lesser General Public License Usage
-** This file may be used under the terms of the GNU Lesser General Public
-** License version 2.1 as published by the Free Software Foundation and
-** appearing in the file LICENSE.LGPL included in the packaging of this
-** file. Please review the following information to ensure the GNU Lesser
-** General Public License version 2.1 requirements will be met:
-** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU General
-** Public License version 3.0 as published by the Free Software Foundation
-** and appearing in the file LICENSE.GPL included in the packaging of this
-** file. Please review the following information to ensure the GNU General
-** Public License version 3.0 requirements will be met:
-** http://www.gnu.org/copyleft/gpl.html.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qlock_p.h"
-
-
-#ifdef QT_NO_QWS_MULTIPROCESS
-
-QT_BEGIN_NAMESPACE
-
-/* no multiprocess - use a dummy */
-
-QLock::QLock(const QString & /*filename*/, char /*id*/, bool /*create*/)
- : type(Read), data(0)
-{
-}
-
-QLock::~QLock()
-{
-}
-
-bool QLock::isValid() const
-{
- return true;
-}
-
-void QLock::lock(Type t)
-{
- data = (QLockData *)-1;
- type = t;
-}
-
-void QLock::unlock()
-{
- data = 0;
-}
-
-bool QLock::locked() const
-{
- return data;
-}
-
-QT_END_NAMESPACE
-
-#else // QT_NO_QWS_MULTIPROCESS
-
-#if defined(Q_OS_DARWIN)
-# define Q_NO_SEMAPHORE
-#endif
-
-#include "qwssignalhandler_p.h"
-
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/ipc.h>
-#if defined(Q_NO_SEMAPHORE)
-# include <sys/stat.h>
-# include <sys/file.h>
-#else
-# include <sys/sem.h>
-#endif
-#include <string.h>
-#include <errno.h>
-#include <qdebug.h>
-
-#include <private/qcore_unix_p.h> // overrides QT_OPEN
-
-QT_BEGIN_NAMESPACE
-
-#define MAX_LOCKS 200 // maximum simultaneous read locks
-
-class QLockData
-{
-public:
-#ifdef Q_NO_SEMAPHORE
- QByteArray file;
-#endif // Q_NO_SEMAPHORE
- int id;
- int count;
- bool owned;
-};
-
-/*!
- \class QLock
- \brief The QLock class is a wrapper for a System V shared semaphore.
-
- \ingroup qws
-
- \internal
-
- It is used by \l{Qt for Embedded Linux} for synchronizing access to the graphics
- card and shared memory region between processes.
-*/
-
-/*!
- \enum QLock::Type
-
- \value Read
- \value Write
-*/
-
-/*!
- \fn QLock::QLock(const QString &filename, char id, bool create)
-
- Creates a lock. \a filename is the file path of the Unix-domain
- socket the \l{Qt for Embedded Linux} client is using. \a id is the name of the
- particular lock to be created on that socket. If \a create is true
- the lock is to be created (as the Qt for Embedded Linux server does); if \a
- create is false the lock should exist already (as the Qt for Embedded Linux
- client expects).
-*/
-
-QLock::QLock(const QString &filename, char id, bool create)
-{
- data = new QLockData;
- data->count = 0;
-#ifdef Q_NO_SEMAPHORE
- data->file = QString(filename+id).toLocal8Bit().constData();
- for(int x = 0; x < 2; x++) {
- data->id = QT_OPEN(data->file, O_RDWR | (x ? O_CREAT : 0), S_IRWXU);
- if(data->id != -1 || !create) {
- data->owned = x;
- break;
- }
- }
-#else
- key_t semkey = ftok(filename.toLocal8Bit().constData(), id);
- data->id = semget(semkey,0,0);
- data->owned = create;
- if (create) {
- qt_semun arg; arg.val = 0;
- if (data->id != -1)
- semctl(data->id,0,IPC_RMID,arg);
- data->id = semget(semkey,1,IPC_CREAT|0600);
- arg.val = MAX_LOCKS;
- semctl(data->id,0,SETVAL,arg);
-
- QWSSignalHandler::instance()->addSemaphore(data->id);
- }
-#endif
- if (data->id == -1) {
- int eno = errno;
- qWarning("Cannot %s semaphore %s '%c'", (create ? "create" : "get"),
- qPrintable(filename), id);
- qDebug() << "Error" << eno << strerror(eno);
- }
-}
-
-/*!
- \fn QLock::~QLock()
-
- Destroys a lock
-*/
-
-QLock::~QLock()
-{
- if (locked())
- unlock();
-#ifdef Q_NO_SEMAPHORE
- if(isValid()) {
- QT_CLOSE(data->id);
- if(data->owned)
- unlink(data->file);
- }
-#else
- if(data->owned)
- QWSSignalHandler::instance()->removeSemaphore(data->id);
-#endif
- delete data;
-}
-
-/*!
- \fn bool QLock::isValid() const
-
- Returns true if the lock constructor was successful; returns false if
- the lock could not be created or was not available to connect to.
-*/
-
-bool QLock::isValid() const
-{
- return (data->id != -1);
-}
-
-/*!
- Locks the semaphore with a lock of type \a t. Locks can either be
- \c Read or \c Write. If a lock is \c Read, attempts by other
- processes to obtain \c Read locks will succeed, and \c Write
- attempts will block until the lock is unlocked. If locked as \c
- Write, all attempts to lock by other processes will block until
- the lock is unlocked. Locks are stacked: i.e. a given QLock can be
- locked multiple times by the same process without blocking, and
- will only be unlocked after a corresponding number of unlock()
- calls.
-*/
-
-void QLock::lock(Type t)
-{
- if (!data->count) {
-#ifdef Q_NO_SEMAPHORE
- int op = LOCK_SH;
- if(t == Write)
- op = LOCK_EX;
- for(int rv=1; rv;) {
- rv = flock(data->id, op);
- if (rv == -1 && errno != EINTR)
- qDebug("Semop lock failure %s",strerror(errno));
- }
-#else
- sembuf sops;
- sops.sem_num = 0;
- sops.sem_flg = SEM_UNDO;
-
- if (t == Write) {
- sops.sem_op = -MAX_LOCKS;
- type = Write;
- } else {
- sops.sem_op = -1;
- type = Read;
- }
-
- int rv;
- do {
- rv = semop(data->id,&sops,1);
- if (rv == -1 && errno != EINTR)
- qDebug("Semop lock failure %s",strerror(errno));
- } while (rv == -1 && errno == EINTR);
-#endif
- }
- data->count++;
-}
-
-/*!
- \fn void QLock::unlock()
-
- Unlocks the semaphore. If other processes were blocking waiting to
- lock() the semaphore, one of them will wake up and succeed in
- lock()ing.
-*/
-
-void QLock::unlock()
-{
- if(data->count) {
- data->count--;
- if(!data->count) {
-#ifdef Q_NO_SEMAPHORE
- for(int rv=1; rv;) {
- rv = flock(data->id, LOCK_UN);
- if (rv == -1 && errno != EINTR)
- qDebug("Semop lock failure %s",strerror(errno));
- }
-#else
- sembuf sops;
- sops.sem_num = 0;
- sops.sem_op = 1;
- sops.sem_flg = SEM_UNDO;
- if (type == Write)
- sops.sem_op = MAX_LOCKS;
-
- int rv;
- do {
- rv = semop(data->id,&sops,1);
- if (rv == -1 && errno != EINTR)
- qDebug("Semop unlock failure %s",strerror(errno));
- } while (rv == -1 && errno == EINTR);
-#endif
- }
- } else {
- qDebug("Unlock without corresponding lock");
- }
-}
-
-/*!
- \fn bool QLock::locked() const
-
- Returns true if the lock is currently held by the current process;
- otherwise returns false.
-*/
-
-bool QLock::locked() const
-{
- return (data->count > 0);
-}
-
-QT_END_NAMESPACE
-
-#endif // QT_NO_QWS_MULTIPROCESS
-
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