diff options
Diffstat (limited to 'src/gui/embedded/qlock.cpp')
| -rw-r--r-- | src/gui/embedded/qlock.cpp | 176 |
1 files changed, 76 insertions, 100 deletions
diff --git a/src/gui/embedded/qlock.cpp b/src/gui/embedded/qlock.cpp index d429b93..ac15431 100644 --- a/src/gui/embedded/qlock.cpp +++ b/src/gui/embedded/qlock.cpp @@ -7,29 +7,29 @@ ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ -** No Commercial Usage -** This file contains pre-release code and may not be distributed. -** You may use this file in accordance with the terms and conditions -** contained in the Technology Preview License Agreement accompanying -** this package. -** ** GNU Lesser General Public License Usage -** Alternatively, 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. +** 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 +** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** -** If you have questions regarding the use of this file, please contact -** Nokia at qt-info@nokia.com. -** -** +** 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. ** ** ** @@ -99,7 +99,6 @@ QT_END_NAMESPACE #endif #include <string.h> #include <errno.h> -#include <qdebug.h> #include <private/qcore_unix_p.h> // overrides QT_OPEN @@ -138,8 +137,6 @@ public: */ /*! - \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 @@ -147,76 +144,79 @@ public: 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->file = filename.toLocal8Bit() + id; + for (int x = 0; x < 2; ++x) { + data->id = QT_OPEN(data->file.constData(), 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->id = semget(semkey, 0, 0); data->owned = create; if (create) { - qt_semun arg; arg.val = 0; + 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); + 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); + semctl(data->id, 0, SETVAL, arg); } #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); + if (!isValid()) { + qWarning("QLock::QLock: Cannot %s semaphore %s '%c' (%d, %s)", + (create ? "create" : "get"), qPrintable(filename), id, + errno, strerror(errno)); } + +#ifndef QT_NO_QWS_SIGNALHANDLER + QWSSignalHandler::instance()->addLock(this); +#endif } /*! - \fn QLock::~QLock() - Destroys a lock */ - QLock::~QLock() { - if (locked()) +#ifndef QT_NO_QWS_SIGNALHANDLER + QWSSignalHandler::instance()->removeLock(this); +#endif + + while (locked()) unlock(); #ifdef Q_NO_SEMAPHORE - if(isValid()) { + if (isValid()) QT_CLOSE(data->id); - if(data->owned) - unlink(data->file); - } +#endif + if (data->owned) { +#ifdef Q_NO_SEMAPHORE + unlink(data->file.constData()); #else - if(data->owned) - QWSSignalHandler::instance()->removeSemaphore(data->id); + qt_semun semval; + semval.val = 0; + semctl(data->id, 0, IPC_RMID, semval); #endif + } delete data; + data = 0; } /*! - \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); + return data && data->id != -1; } /*! @@ -230,96 +230,72 @@ bool QLock::isValid() const will only be unlocked after a corresponding number of unlock() calls. */ - void QLock::lock(Type t) { if (!data->count) { + type = t; + + int rv; #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)); - } + int op = type == Write ? LOCK_EX : LOCK_SH; + + EINTR_LOOP(rv, flock(data->id, op)); #else sembuf sops; sops.sem_num = 0; + sops.sem_op = type == Write ? -MAX_LOCKS : -1; 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); + EINTR_LOOP(rv, semop(data->id, &sops, 1)); #endif + if (rv == -1) { + qDebug("QLock::lock(): %s", strerror(errno)); + return; + } + } else if (type == Read && t == Write) { + qDebug("QLock::lock(): Attempt to lock for write while locked for read"); } 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. + locking. */ - void QLock::unlock() { - if(data->count) { + if (data->count) { data->count--; - if(!data->count) { + if (!data->count) { + int rv; #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)); - } + EINTR_LOOP(rv, flock(data->id, LOCK_UN)); #else sembuf sops; sops.sem_num = 0; - sops.sem_op = 1; + sops.sem_op = type == Write ? MAX_LOCKS : 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); + EINTR_LOOP(rv, semop(data->id, &sops, 1)); #endif + if (rv == -1) + qDebug("QLock::unlock(): %s", strerror(errno)); } } else { - qDebug("Unlock without corresponding lock"); + qDebug("QLock::unlock(): 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); + return isValid() && data->count > 0; } QT_END_NAMESPACE #endif // QT_NO_QWS_MULTIPROCESS - |