diff options
Diffstat (limited to 'src/gui/embedded/qlock.cpp')
| -rw-r--r-- | src/gui/embedded/qlock.cpp | 142 |
1 files changed, 59 insertions, 83 deletions
diff --git a/src/gui/embedded/qlock.cpp b/src/gui/embedded/qlock.cpp index bb442e4..ac15431 100644 --- a/src/gui/embedded/qlock.cpp +++ b/src/gui/embedded/qlock.cpp @@ -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 - |